CDRH3D16-4R7 [ANALOGICTECH]
1MHz Step-Down Converter/LDO Regulator; 1MHz的降压转换器/ LDO稳压器
| 型号： | CDRH3D16-4R7 |
| 厂家： | 
ADVANCED ANALOGIC TECHNOLOGIES |
| 描述： | 1MHz Step-Down Converter/LDO Regulator |
| 文件： | 总26页 (文件大小：558K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AAT2506
1MHz Step-Down Converter/LDO Regulator
™
SysPwr
General Description
Features
The AAT2506 is a member of AnalogicTech's Total
Power Management IC™ (TPMIC™) product fam-
ily. It is a low dropout (LDO) linear regulator and a
step-down converter with an input voltage range of
2.7V to 5.5V, making it ideal for applications with
single lithium-ion/polymer batteries.
•
•
•
•
•
•
•
•
•
VIN Range: 2.7V to 5.5V
VOUT Range: 0.6V to VIN
300mA LDO Current Output
400mV LDO Dropout Voltage at 300mA
High Output Accuracy: ±1.5%
Fast LDO Line / Load Transient Response
600mA, 97% Efficiency Step-Down Converter
Fast Turn-On Time (100µs Typical)
25µA No Load Quiescent Current for Step-
Down Converter
The LDO has an independent input and is capable
of delivering up to 300mA. The linear regulator has
been designed for high-speed turn-on and turn-off
performance, fast transient response, and good
power supply rejection ratio (PSRR). Other fea-
tures include low quiescent current and a low
dropout voltage.
•
•
•
•
•
•
•
•
•
Shutdown Current <1µA
Low RDS(ON) 0.4Ω Integrated Power Switches
100% Duty Cycle Low Dropout Operation
1MHz Switching Frequency
100µs Typical Soft Start
Over-Temperature Protection
Current Limit Protection
Available in TDFN33-12 Package
-40°C to +85°C Temperature Range
The AAT2506 is available in either a fixed version
with internal feedback or a programmable version
with external feedback resistors. It can deliver
600mA of load current while maintaining a low
25µA no load quiescent current. The 1MHz switch-
ing frequency minimizes the size of external com-
ponents while keeping switching losses low. The
AAT2506 feedback and control delivers excellent
load regulation and transient response with a small
output inductor and capacitor.
Applications
•
•
•
•
•
•
Cellular Phones
Digital Cameras
Handheld Instruments
Microprocessor/DSP Core/IO Power
PDAs and Handheld Computers
Portable Media Players
The AAT2506 is designed to maintain high efficien-
cy throughout the operating range, which is critical
for portable applications.
The AAT2506 is available in a 12-pin TDFN33
package, and is rated over a temperature range of
-40°C to +85°C.
Typical Application
VIN = 2.7V to 5.5V
AAT2506 Step-Down Converter Efficiency
(VOUT = 2.5V; L = 10µH)
C3
10µF
3
5
9
6
7
8
4
100
VP
VCC
EN
10
2
VLDO
ENLDO
OUT
BYP
GND
U1
L1
3.3V at 300mA
90
80
70
60
LX
4.7µH
11
12
1
VIN = 3.3V
FB
SGND
PGND
C1
22µF
C4
2.2µF
C5
AAT2506
10nF
0.1
1
10
100
1000
L1 Sumida CDRH3D16-4R7 C1 Murata GRM219R61A475KE19
C3 Murata GRM21BR60J106KE19
Output Current (mA)
2506.2005.12.1.0
1
AAT2506
1MHz Step-Down Converter/LDO Regulator
Pin Descriptions
Pin #
Symbol
Function
1
PGND
Step-down converter power ground return pin. Connect to the output and input capaci-
tor return. See section on PCB layout guidelines and evaluation board layout diagram.
Power switching node. Output switching node that connects to the output inductor.
Step-down converter power stage supply voltage. Must be closely decoupled to PGND.
Step-down converter bias supply. Connect to VP.
2
3
4
5
6
LX
VP
VCC
VLDO
OUT
LDO input voltage; should be decoupled with 1µF or greater capacitor.
300mA LDO output pin. A 2.2µF or greater output low-ESR ceramic capacitor is
required for stability.
7
BYP
Bypass capacitor for the LDO. To improve AC ripple rejection, connect a 10nF capaci-
tor to GND. This will also provide a soft-start function.
8
9
GND
LDO ground connection pin.
ENLDO
Enable pin for LDO. When connected low, LDO is disabled and consumes less than
1µA of current.
10
11
EN
FB
Step-down converter enable. When connected low, LDO is disabled and consumes
less than 1µA.
Step-down converter feedback input pin. For fixed output voltage versions, this pin is
connected to the converter output, forcing the converter to regulate to the specific volt-
age. For adjustable output versions, an external resistive divider ties to this point and
programs the output voltage to the desired value.
12
SGND
Step-down converter signal ground. For external feedback, return the feedback resis-
tive divider to this ground. For internal fixed version, tie to the point of load return. See
section on PCB layout guidelines and evaluation board layout diagram.
Exposed paddle (bottom). Use properly sized vias for thermal coupling to the ground
plane. See section on PCB layout guidelines.
EP
Pin Configuration
TDFN33-12
(TopView)
1
2
3
4
5
6
12
11
10
9
PGND
LX
VP
VCC
VLDO
OUT
SGND
FB
EN
ENLDO
GND
BYP
8
7
2
2506.2005.12.1.0
AAT2506
1MHz Step-Down Converter/LDO Regulator
Absolute Maximum Ratings1
Symbol
Description
Value
Units
VP, VLDO
VLX
Input Voltages to GND
LX to GND
6.0
V
V
-0.3 to VP + 0.3
-0.3 to VP + 0.3
-0.3 to 6.0
-40 to 150
300
VFB
FB to GND
V
VEN
EN to GND
V
TJ
Operating Junction Temperature Range
Maximum Soldering Temperature (at leads, 10 sec)
°C
°C
TLEAD
Thermal Information
Symbol
Description
Value
Units
PD
Maximum Power Dissipation
Thermal Resistance2
2
W
θJA
50
°C/W
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at
conditions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any
one time.
2. Mounted on an FR4 board with exposed paddle connected to ground plane.
2506.2005.12.1.0
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AAT2506
1MHz Step-Down Converter/LDO Regulator
Electrical Characteristics1
Symbol Description
Conditions
Min
Typ Max
Units
V
IN = VLDO = VOUT(NOM) + 1V for VOUT options greater than 1.5V. VIN = VLDO = 2.5V for VOUT ≤ 1.5V. IOUT
=
LDO
1mA, COUT = 2.2µF, CIN = 1µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C.
TA = 25°C
IOUT = 1mA to 300mA TA = -40°C
to 85°C
-1.5
-2.5
1.5
2.5
VOUT
Output Voltage Tolerance
%
2
VIN
VDO
Input Voltage
Dropout Voltage3, 4
VOUT+VDO
5.5
V
IOUT = 300mA
400 600
mV
∆VOUT
VOUT*∆VIN
/
Line Regulation
VIN = VOUT + 1V to 5V
0.09
%/V
mV
IOUT = 300mA, VIN = VOUT + 1V to
∆VOUT(Line) Dynamic Line Regulation
2.5
60
VOUT + 2V, TR/TF = 2µS
IOUT = 1mA to 300mA, TR <5µS
VOUT > 1.3V
∆VOUT(Load) Dynamic Load Regulation
mV
mA
mA
µA
IOUT
ISC
Output Current
300
Short-Circuit Current
LDO Quiescent Current
VOUT < 0.4V
600
IQLDO
VIN = 5V, No Load, ENLDO = VIN
70
125
1.0
VIN = 5V; ENLDO = GND,
ISHDN
PSRR
TSD
Shutdown Current
µA
dB
°C
EN = SGND = PGND
1kHz
67
47
45
Power Supply Rejection Ratio IOUT = 10mA, CBYP = 10nF 10kHz
1MHz
Over-Temperature Shutdown
Threshold
145
Over-Temperature Shutdown
Hysteresis
THYS
eN
12
50
22
°C
Output Noise
eNBW = 300Hz to 50kHz
µVRMS
ppm/°C
Output Voltage Temperature
Coefficient
TC
1. The AAT2506 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured
by design, characterization, and correlation with statistical process controls.
2. To calculate the minimum LDO input voltage, use the following equation: VIN(MIN) = VOUT(MAX) + VDO(MAX), as long as VIN ≥ 2.5V.
3. For VOUT <2.1V, VDO = 2.5 - VOUT
.
4. VDO is defined as VIN - VOUT when VOUT is 98% of nominal.
4
2506.2005.12.1.0
AAT2506
1MHz Step-Down Converter/LDO Regulator
Electrical Characteristics1
Symbol
Description
Conditions
Min Typ Max Units
Buck Converter Typical values are TA = 25°C, VIN = VCC = Vp = 3.6V.
VIN
Input Voltage
2.7
5.5
2.6
V
V
VIN Rising
Hysteresis
VIN Falling
VUVLO
UVLO Threshold
100
25
mV
V
1.8
-3.5
0.6
I
OUT = 0 to 400mA,
VOUT
VOUT
Output Voltage Tolerance
+3.5
4.0
50
%
V
VIN = 2.7V to 5.5V
Output Voltage Range
Step-Down Converter
Quiescent Current
Shutdown Current
P-Channel Current Limit
High Side Switch On
Resistance
Fixed Output Version
ENLDO = GND, No Load,
0.6V Adjustable Model
IQBUCK
µA
ISHDN
ILIM
EN = SGND = PGND, ENLDO = GND
1.0
µA
600
mA
RDS(ON)H
RDS(ON)L
0.45
0.40
Ω
Ω
Low Side Switch On
Resistance
V
IN = 5.5V, VLX = 0 - VIN
ILXLK
LX Leakage Current
1.0
µA
EN = SGND = PGND
ILXLK, R
LX Reverse Leakage Current VIN = Open, VLX = 5.5V,
1.0
0.5
µA
%/V
mV
(fixed)
EN = SGND = PGND
VIN = 2.7V to 5.5V
VLinereg
VFB
Line Regulation
FB Threshold Voltage
Accuracy
0.6V Output, No Load, TA = 25°C
591
0.7
600 609
0.2
IFB
FOSC
TS
FB Leakage Current
Oscillator Frequency
Start-Up Time
0.6V Output
µA
MHz
µs
TA = 25°C
1.0
1.5
From Enable to Output Regulation
100
Over-Temperature Shutdown
Threshold
TSD
140
15
°C
°C
Over-Temperature Shutdown
Hysteresis
THYS
Logic Signals
VEN(L)
Enable Threshold Low
Enable Threshold High
Leakage Current
0.6
1.0
V
V
VEN(H)
1.5
1.0
IEN(H)
µA
1. The AAT2506 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured
by design, characterization, and correlation with statistical process controls.
2506.2005.12.1.0
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AAT2506
1MHz Step-Down Converter/LDO Regulator
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
LDO Dropout Voltage vs. Temperature
(EN = GND; ENLDO = VIN)
LDO Dropout Characteristics
(EN = GND; ENLDO = VIN)
540
480
420
360
300
240
180
120
60
3.20
3.00
2.80
2.60
2.40
2.20
2.00
IL = 300mA
IOUT = 0mA
IL = 100mA
IL = 150mA
IOUT = 300mA
IOUT = 150mA
IOUT = 100mA
IOUT = 50mA
IOUT = 10mA
2.80
IL = 50mA
0
-40 -30 -20 -10
0
10 20 30 40 50 60 70 80 90 100 110 120
2.70
2.90
3.00
3.10
3.20
3.30
Temperature (°C)
Input Voltage (V)
LDO Dropout Voltage vs. Output Current
(EN = GND; ENLDO = VIN)
LDO Ground Current vs. Input Voltage
(EN = GND; ENLDO = VIN)
90.00
80.00
70.00
60.00
50.00
40.00
30.00
20.00
10.00
0.00
500
450
400
350
300
250
200
150
100
50
IOUT=300mA
IOUT=150mA
85°C
25°C
IOUT=50mA
IOUT=0mA
-40°C
IOUT=10mA
0
0
50
100
150
200
250
300
2
2.5
3
3.5
4
4.5
5
Input Voltage (V)
Output Current (mA)
LDO Initial Power-Up Response Time
(CBYP = 10nF; EN = GND; ENLDO = VIN)
LDO Dropout Voltage vs. Temperature
(EN = GND; ENLDO = VIN)
540
480
420
360
300
240
180
120
60
IL = 300mA
VENLDO (5V/div)
IL = 100mA
IL = 150mA
IL = 50mA
0
VOUT (1V/div)
-40 -30 -20 -10
0
10 20 30 40 50 60 70 80 90 100 110 120
Temperature (°C)
400µµs/div
6
2506.2005.12.1.0
AAT2506
1MHz Step-Down Converter/LDO Regulator
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C, VIN = VLDO = VCC = VP.
LDO Turn-On Time From Enable (VIN present)
(CBYP = 10nF; EN = GND; ENLDO = VIN)
LDO Turn-Off Response Time
(CBYP = 10nF; EN = GND; ENLDO = VIN)
VENLDO = 5V/div
VENLDO (5V/div)
VIN = 4V
VOUT (1V/div)
VOUT = 1V/div
50µs/div
5µs/div
LDO Line Transient Response
(CBYP = 10nF; EN = GND; ENLDO = VIN)
LDO Load Transient Response
(CBYP = 10nF; EN = GND; ENLDO = VIN)
2.90
2.85
2.80
2.75
2.70
2.65
2.60
500
400
300
200
100
0
6
5
4
3
2
1
0
3.04
3.03
3.02
3.01
3.00
2.99
2.98
VOUT
VIN
VOUT
IOUT
-100
100µS/div
100µs/div
LDO Load Transient Response 300mA
(CBYP = 10nF; EN = GND; ENLDO = VIN)
LDO Self Noise
(EN = GND; ENLDO = VIN)
3.00
800
10
1
2.90
2.80
2.70
2.60
2.50
2.40
2.30
2.20
2.10
700
600
500
400
300
200
100
0
VOUT
0.1
Band Power:
300Hz to 50kHz = 44.6µVrms
100Hz to 100kHz = 56.3µVrms
0.01
IOUT
0.001
0.01
0.1
1
10
100
1000
10000
-100
10µµs/div
Frequency (kHz)
2506.2005.12.1.0
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AAT2506
1MHz Step-Down Converter/LDO Regulator
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Over-Current Protection
(EN = GND; ENLDO = VIN)
LDO ENLDO vs. VIN
1200
1000
800
600
400
200
0
1.250
1.225
1.200
1.175
VIH
1.150
1.125
1.100
1.075
1.050
VIL
-200
2.5
3.0
3.5
4.0
4.5
5.0
5.5
Time (50ms/div)
Input Voltage (V)
Step-Down Converter Efficiency vs. Load
(VOUT = 3.3V; L = 10µH; ENLDO = GND)
Step-Down Converter DC Regulation
(VOUT = 3.3V; L = 10µH; ENLDO = GND)
3.0
2.0
100
VIN = 4.2V
90
VIN = 3.9V
1.0
VIN = 4.2V
0.0
80
-1.0
-2.0
-3.0
VIN = 3.9V
70
60
0.1
1
10
100
1000
0.1
1
10
100
1000
Output Current (mA)
Output Current (mA)
Step-Down Converter Efficiency vs. Load
(VOUT = 2.5V; L = 10µH; ENLDO = GND)
Step-Down Converter DC Regulation
(VOUT = 2.5V; L = 10µH; ENLDO = GND)
3.0
2.0
100
VIN = 3.3V
VIN = 3.3V
VIN = 3.6V
90
80
70
60
1.0
VIN = 3.0V
VIN = 3.6V
0.0
VIN = 3.0V
-1.0
-2.0
-3.0
0.1
1
10
100
1000
0.1
1
10
100
1000
Output Current (mA)
Output Current (mA)
8
2506.2005.12.1.0
AAT2506
1MHz Step-Down Converter/LDO Regulator
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Step-Down Converter Efficiency vs. Load
(VOUT = 1.5V; L = 4.7µH; ENLDO = GND)
Step-Down Converter DC Regulation
(VOUT = 1.5V; L = 4.7µH; ENLDO = GND)
3.0
2.0
100
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
VIN = 3.6V
90
80
70
60
50
1.0
VIN = 4.2V
0.0
VIN = 2.7V
-1.0
-2.0
-3.0
0.1
1
10
100
1000
0.1
1
10
100
1000
Output Current (mA)
Output Current (mA)
Step-Down Converter
Frequency vs. Input Voltage
(VOUT = 1.8V; EN = VIN; ENLDO = GND)
Step-Down Converter
Output Voltage Error vs. Temperature
(VIN = 3.6V; VO = 1.5V; EN = VIN; ENLDO = GND)
2.0
1.0
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
0.0
-1.0
-2.0
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
-40
-20
0
20
40
60
80
100
Input Voltage (V)
Temperature (°C)
Step-Down Converter
Switching Frequency vs. Temperature
(VIN = 3.6V; VO = 1.5V; EN = VIN; ENLDO = GND)
Step-Down Converter
Input Current vs. Input Voltage
(VO = 1.8V; EN = VIN; ENLDO = GND)
35
30
25
20
15
0.20
0.10
85°C
25°C
0.00
-0.10
-40°C
-0.20
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
-40
-20
0
20
40
60
80
100
Input Voltage (V)
Temperature (°°C)
2506.2005.12.1.0
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AAT2506
1MHz Step-Down Converter/LDO Regulator
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Step-Down Converter
P-Channel RDS(ON) vs. Input Voltage
(EN = VIN; ENLDO = GND)
Step-Down Converter
N-Channel RDS(ON) vs. Input Voltage
(EN = VIN; ENLDO = GND)
750
700
750
700
650
650
120°C
100°C
120°C
100°C
600
550
500
600
550
500
450
400
350
300
85°C
85°C
450
25°C
400
25°C
350
300
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Input Voltage (V)
Input Voltage (V)
Step-Down Converter Load Transient Response
(30mA - 300mA; VIN = 3.6V; VOUT = 1.5V;
Step-Down Converter Load Transient Response
(30mA - 300mA; VIN = 3.6V; VOUT = 2.5V;
C1 = 22µF; ENLDO = GND)
C1 = 22µF; ENLDO = GND)
1.65
2.65
1.5
1.5
1.3
1.60
1.55
2.55
1.3
1.50
1.1
1.1
1.45
300mA
2.45
300mA
1.40
0.9
0.9
30mA
30mA
1.35
2.35
0.7
0.7
1.30
1.25
0.5
0.5
2.25
1.20
0.3
0.1
-0.1
1.15
1.10
1.05
1.00
0.3
2.15
2.05
0.1
-0.1
Time (25µs/div)
Time (25µs/div)
Step-Down Converter Line Regulation
(VOUT = 1.5V; ENLDO = GND)
Step-Down Converter Line Transient
(VOUT = 1.8V @ 400mA; EN = VIN; ENLDO = GND)
2
1.5
1
1.90
1.85
1.80
1.75
1.70
1.65
1.60
1.55
1.50
7.0
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
IOUT = 600mA
0.5
0
IOUT = 100mA
IOUT = 10mA
-0.5
-1
2.5
3
3.5
4
4.5
5
5.5
6
Time (25µs/div)
Input Voltage (V)
10
2506.2005.12.1.0
AAT2506
1MHz Step-Down Converter/LDO Regulator
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Step-Down Converter Soft Start
(VIN = 3.6V; VOUT = 1.5V; L = 4.7µH; ENLDO = GND)
Step-Down Converter Output Ripple
(VIN = 3.6V; VOUT = 1.8V; 400mA;
EN = VIN; ENLDO = GND)
4.0
3.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-0.5
40
20
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
2.0
0
1.0
-20
-40
-60
-80
-100
-120
0.0
-1.0
-2.0
-3.0
-4.0
Time (50µs/div)
Time (250ns/div)
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AAT2506
1MHz Step-Down Converter/LDO Regulator
Functional Block Diagram
VCC
VP
FB
Error
Amp.
DH
See
Note
LX
Logic
Voltage
Reference
Control
Logic
DL
EN
PGND
OUT
SGND
VLDO
Over-Current
Protection
Error
Amp.
Voltage
Reference
BYP
Fast Start
Control
ENLDO
GND
Note: Internal resistor divider included for ≥1.2V versions. For low voltage versions, the feedback pin is tied directly to the error
amplifier input.
12
2506.2005.12.1.0
AAT2506
1MHz Step-Down Converter/LDO Regulator
plete short-circuit and thermal protection. The com-
bination of these two internal protection circuits
gives a comprehensive safety system to guard
Functional Description
The AAT2506 is a high performance power man-
agement IC comprised of a buck converter and a
linear regulator. The buck converter is a high effi-
ciency converter capable of delivering up to
600mA. Designed to operate at 1.0MHz, the con-
verter requires only three external components
(CIN, COUT, and LX) and is stable with a ceramic
output capacitor. The linear regulator delivers
300mA and is also stable with ceramic capacitors.
against extreme adverse operating conditions.
The regulator features an enable/disable function.
This pin (ENLDO) is active high and is compatible
with CMOS logic. To assure the LDO regulator will
switch on, the ENLDO turn-on control level must be
greater than 1.5V. The LDO regulator will go into
the disable shutdown mode when the voltage on
the EN pin falls below 0.6V. If the enable function is
not needed in a specific application, it may be tied
to VIN to keep the LDO regulator in a continuously
on state.
Linear Regulator
When the regulator is in shutdown mode, an inter-
nal 1.5kΩ resistor is connected between OUT and
GND. This is intended to discharge COUT when the
LDO regulator is disabled. The internal 1.5KΩ
resistor has no adverse impact on device turn-on
time.
The advanced circuit design of the linear regulator
has been specifically optimized for very fast start-
up and shutdown timing. This proprietary CMOS
LDO has also been tailored for superior transient
response characteristics. These traits are particu-
larly important for applications that require fast
power supply timing.
The high-speed turn-on capability is enabled
through implementation of a fast-start control cir-
cuit, which accelerates the power-up behavior of
fundamental control and feedback circuits within
the LDO regulator. Fast turn-off time response is
achieved by an active output pull-down circuit,
which is enabled when the LDO regulator is
placed in shutdown mode. This active fast shut-
down circuit has no adverse effect on normal
device operation. The LDO regulator output has
been specifically optimized to function with low-
cost, low-ESR ceramic capacitors; however, the
design will allow for operation over a wide range
of capacitor types.
Step-Down Converter
The AAT2506 buck is a constant frequency peak
current mode PWM converter with internal com-
pensation. It is designed to operate with an input
voltage range of 2.7V to 5.5V. The output voltage
ranges from 0.6V to the input voltage. The 0.6V
fixed model shown in Figure 1 is also the
adjustable version and is externally programmable
with a resistive divider, as shown in Figure 2. The
converter MOSFET power stage is sized for
600mA load capability with up to 97% efficiency.
Light load efficiency exceeds 80% at a 500µA load.
A bypass pin has been provided to allow the addi-
tion of an optional voltage reference bypass capac-
itor to reduce output self noise and increase power
supply ripple rejection. Device self noise and
PSRR will be improved by the addition of a small
ceramic capacitor in this pin. However, increased
values of CBYPASS may slow down the LDO regula-
tor turn-on time. The regulator comes with com-
Soft Start
The AAT2506 soft-start control prevents output
voltage overshoot and limits inrush current when
either the input power or the enable input is
applied. When pulled low, the enable input forces
the converter into a low-power, non-switching state
with a bias current of less than 1µA.
2506.2005.12.1.0
13
AAT2506
1MHz Step-Down Converter/LDO Regulator
VIN
VIN
C3
C3
3
5
9
6
7
8
4
VP
VCC
EN
10µF
3
5
9
6
7
8
4
VP
VCC
EN
10µF
10
2
VLDO
ENLDO
OUT
BYP
10
2
VOUTBUCK
VLDO
ENLDO
OUT
BYP
L1
VOUTBUCK
L1
LX
LX
VOUTLDO
11
12
1
VOUTLDO
R1
11
12
1
FB
FB
SGND
PGND
SGND
PGND
C1
22µF
C8
GND
GND
C4
4.7µF
C4
4.7µF
100pF
C1
22µF
C5
C5
U1
AAT2506
R2
59k
U1
AAT2506
10nF
10nF
Figure 1: AAT2506 Fixed Output.
Figure 2: AAT2506 with Adjustable Step-Down
Output and Enhanced Transient Response.
Low Dropout Operation
Applications Information
For conditions where the input voltage drops to the
output voltage level, the converter duty cycle
increases to 100%. As 100% duty cycle is
approached, the minimum off-time initially forces
the high side on-time to exceed the 1MHz clock
cycle and reduce the effective switching frequency.
Once the input drops below the level where the out-
put can be regulated, the high side P-channel
MOSFET is turned on continuously for 100% duty
cycle. At 100% duty cycle, the output voltage tracks
the input voltage minus the IR drop of the high side
Linear Regulator
Input and Output Capacitors: An input capacitor
is not required for basic operation of the linear reg-
ulator. However, if the AAT2506 is physically locat-
ed more than three centimeters from an input
power source, a CIN capacitor will be needed for
stable operation. Typically, a 1µF or larger capaci-
tor is recommended for CIN in most applications.
CIN should be located as closely to the device VIN
pin as practically possible.
P-channel MOSFET RDS(ON)
.
An input capacitor greater than 1µF will offer supe-
rior input line transient response and maximize
power supply ripple rejection. Ceramic, tantalum,
or aluminum electrolytic capacitors may be select-
ed for CIN. There is no specific capacitor ESR
requirement for CIN. However, for 300mA LDO reg-
ulator output operation, ceramic capacitors are rec-
ommended for CIN due to their inherent capability
over tantalum capacitors to withstand input current
surges from low impedance sources such as bat-
teries in portable devices.
Low Supply
The under-voltage lockout (UVLO) guarantees suf-
ficient VIN bias and proper operation of all internal
circuitry prior to activation.
Fault Protection
For overload conditions, the peak inductor current is
limited. Thermal protection disables switching when
the internal dissipation or ambient temperature
becomes excessive. The junction over-temperature
threshold is 140°C with 15°C of hysteresis.
For proper load voltage regulation and operational
stability, a capacitor is required between OUT and
GND. The COUT capacitor connection to the LDO
regulator ground pin should be made as directly as
practically possible for maximum device perform-
ance. Since the regulator has been designed to
function with very low ESR capacitors, ceramic
capacitors in the 1.0µF to 10µF range are recom-
mended for best performance. Applications utilizing
14
2506.2005.12.1.0
AAT2506
1MHz Step-Down Converter/LDO Regulator
the exceptionally low output noise and optimum
Step-Down Converter
power supply ripple rejection should use 2.2µF or
greater for COUT. In low output current applications,
where output load is less than 10mA, the minimum
value for COUT can be as low as 0.47µF.
Inductor Selection: The step-down converter
uses peak current mode control with slope com-
pensation to maintain stability for duty cycles
greater than 50%. The output inductor value must
be selected so the inductor current down slope
meets the internal slope compensation require-
ments. The internal slope compensation for the
adjustable and low-voltage fixed versions of the
AAT2506 is 0.24A/µsec. This equates to a slope
compensation that is 75% of the inductor current
down slope for a 1.5V output and 4.7µH inductor.
Equivalent Series Resistance: ESR is a very
important characteristic to consider when selecting a
capacitor. ESR is the internal series resistance asso-
ciated with a capacitor that includes lead resistance,
internal connections, size and area, material compo-
sition, and ambient temperature. Typically, capacitor
ESR is measured in milliohms for ceramic capaci-
tors and can range to more than several ohms for
tantalum or aluminum electrolytic capacitors.
0.75 ⋅ VO 0.75 ⋅ 1.5V
= 0.24
A
m =
=
L
4.7µH
µsec
Bypass Capacitor and Low Noise
Applications
This is the internal slope compensation for the
adjustable (0.6V) version or low-voltage fixed ver-
sions. When externally programming the 0.6V ver-
sion to 2.5V, the calculated inductance is 7.5µH.
A bypass capacitor pin is provided to enhance the
low noise characteristics of the LDO. The bypass
capacitor is not necessary for operation; however,
for best device performance, a small ceramic
capacitor in the range of 470pF to 10nF should be
placed between the bypass pin (BYP) and the
device ground pin (GND). To practically realize the
highest power supply ripple rejection and lowest
output noise performance, it is critical that the
capacitor connection between the BYP pin and
GND pin be direct and PCB traces should be as
short as possible.
0.75 ⋅ VO
0.75
⋅
VO
A
µsec
A
L =
=
≈
3
⋅ VO
m
0.24A
µsec
µsec
A
= 3
⋅ 2.5V = 7.5µH
In this case, a standard 10µH value is selected.
DC leakage on this pin can affect the LDO regula-
tor output noise and voltage regulation perform-
ance. For this reason, the use of a low leakage,
high quality ceramic (NPO or C0G type) or film
capacitor is highly recommended.
For high-voltage fixed versions (2.5V and above),
m = 0.48A/µsec. Table 1 displays inductor values
for the AAT2506 fixed and adjustable options.
Configuration
Output Voltage
0.6V to 2.0V
2.5V to VIN
Inductor
4.7µH
Slope Compensation
0.24A/µsec
0.6V Adjustable With
External Resistive Divider
10µH
0.24A/µsec
0.6V to 2.0V
2.5V to VIN
4.7µH
0.24A/µsec
Fixed Output
4.7µH
0.48A/µsec
Table 1: Inductor Values.
2506.2005.12.1.0
15
AAT2506
1MHz Step-Down Converter/LDO Regulator
Manufacturer's specifications list both the inductor
The input capacitor RMS ripple current varies with
the input and output voltage and will always be less
than or equal to half of the total DC load current.
DC current rating, which is a thermal limitation, and
the peak current rating, which is determined by the
saturation characteristics. The inductor should not
show any appreciable saturation under normal load
conditions. Some inductors may meet the peak and
average current ratings yet result in excessive loss-
es due to a high DCR. Always consider the losses
associated with the DCR and its effect on the total
converter efficiency when selecting an inductor.
VOBUCK
VIN
⎛
· 1
⎝
VOBUCK
VIN
⎞
⎠
1
2
-
=
D
· (1 - D) = 0.52 =
for VIN = 2 x VOBUCK
The 4.7µH CDRH3D16 series inductor selected
from Sumida has a 105mΩ DCR and a 900mA DC
current rating. At full load, the inductor DC loss is
17mW which gives a 2.8% loss in efficiency for a
400mA, 1.5V output.
IOBUCK
IRMS(MAX)
=
2
VOBUCK
VIN
⎛
⎝
VOBUCK
⎞
·
1 -
The term
appears in both the
VIN
⎠
input voltage ripple and input capacitor RMS cur-
rent equations and is a maximum when VOBUCK is
twice VIN. This is why the input voltage ripple and
the input capacitor RMS current ripple are a maxi-
mum at 50% duty cycle.
Input Capacitor
Select a 4.7µF to 10µF X7R or X5R ceramic capac-
itor for the input. To estimate the required input
capacitor size, determine the acceptable input rip-
ple level (VPP) and solve for C. The calculated
value varies with input voltage and is a maximum
when VIN is double the output voltage.
The input capacitor provides a low impedance loop
for the edges of pulsed current drawn by the
AAT2500. Low ESR/ESL X7R and X5R ceramic
capacitors are ideal for this function. To minimize
stray inductance, the capacitor should be placed as
closely as possible to the IC. This keeps the high
frequency content of the input current localized,
minimizing EMI and input voltage ripple.
V
⎛
VOBUCK
VIN
⎞
OBUCK · 1 -
VIN
⎝
⎠
CIN =
⎛ VPP
⎝IOBUCK
⎞
- ESR ·FS
⎠
The proper placement of the input capacitor (C2)
can be seen in the evaluation board layout in
Figure 3.
VOBUCK
VIN
⎛
VOBUCK
VIN
⎞
⎠
1
4
· 1 -
⎝
=
for VIN = 2 × VOBUCK
A laboratory test set-up typically consists of two
long wires running from the bench power supply to
the evaluation board input voltage pins. The induc-
tance of these wires, along with the low-ESR
ceramic input capacitor, can create a high Q net-
work that may affect converter performance. This
problem often becomes apparent in the form of
excessive ringing in the output voltage during load
transients. Errors in the loop phase and gain meas-
urements can also result.
1
CIN(MIN)
=
⎛ VPP
⎝ IOBUCK
⎞
- ESR · 4 · FS
⎠
Always examine the ceramic capacitor DC voltage
coefficient characteristics when selecting the prop-
er value. For example, the capacitance of a 10µF,
6.3V, X5R ceramic capacitor with 5.0V DC applied
is actually about 6µF.
Since the inductance of a short PCB trace feeding
the input voltage is significantly lower than the
power leads from the bench power supply, most
applications do not exhibit this problem.
The maximum input capacitor RMS current is:
VOBUCK
VIN
⎛
VOBUCK
VIN
⎞
IRMS = IOBUCK
·
· 1 -
⎝
⎠
16
2506.2005.12.1.0
AAT2506
1MHz Step-Down Converter/LDO Regulator
Figure 3: AAT2506 Evaluation Board Top Side.
Figure 4: AAT2506 Evaluation Board
Bottom Side.
In applications where the input power source lead
inductance cannot be reduced to a level that does
not affect the converter performance, a high ESR
tantalum or aluminum electrolytic should be placed
in parallel with the low ESR, ESL bypass ceramic.
This dampens the high Q network and stabilizes
the system.
Once the average inductor current increases to the
DC load level, the output voltage recovers. The
above equation establishes a limit on the minimum
value for the output capacitor with respect to load
transients.
The internal voltage loop compensation also limits
the minimum output capacitor value to 22µF. This is
due to its effect on the loop crossover frequency
(bandwidth), phase margin, and gain margin.
Increased output capacitance will reduce the
crossover frequency with greater phase margin.
Output Capacitor
The output capacitor limits the output ripple and
provides holdup during large load transitions. A
22µF X5R or X7R ceramic capacitor typically pro-
vides sufficient bulk capacitance to stabilize the
output during large load transitions and has the
ESR and ESL characteristics necessary for low
output ripple.
The maximum output capacitor RMS ripple current
is given by:
1
V
OUT · (VIN(MAX) - VOUT
)
IRMS(MAX)
=
·
L · F · VIN(MAX)
2 · 3
The output voltage droop due to a load transient is
dominated by the capacitance of the ceramic out-
put capacitor. During a step increase in load cur-
rent, the ceramic output capacitor alone supplies
the load current until the loop responds. Within two
or three switching cycles, the loop responds and
the inductor current increases to match the load
current demand. The relationship of the output volt-
age droop during the three switching cycles to the
output capacitance can be estimated by:
Dissipation due to the RMS current in the ceramic
output capacitor ESR is typically minimal, resulting in
less than a few degrees rise in hot-spot temperature.
Adjustable Output Resistor Selection
For applications requiring an adjustable output volt-
age, the 0.6V version can be externally pro-
grammed. Resistors R1 and R2 of Figure 5 program
the output to regulate at a voltage higher than 0.6V.
To limit the bias current required for the external
feedback resistor string while maintaining good
noise immunity, the minimum suggested value for
3 · ∆ILOAD
=
COUT
VDROOP · FS
2506.2005.12.1.0
17
AAT2506
1MHz Step-Down Converter/LDO Regulator
R2 is 59kΩ. Although a larger value will further
reduce quiescent current, it will also increase the
impedance of the feedback node, making it more
sensitive to external noise and interference. Table 2
summarizes the resistor values for various output
voltages with R2 set to either 59kΩ for good noise
immunity or 221kΩ for reduced no load input current.
Ω
Ω
R2 = 221k
R2 = 59k
Ω
Ω
VOUT (V)
R1 (k )
R1 (k )
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.8
1.85
2.0
2.5
3.3
19.6
29.4
39.2
49.9
59.0
68.1
78.7
88.7
118
75
113
150
187
221
261
301
332
442
464
523
715
1000
V
V
1.5V
0.6V
⎛
⎝
⎞
⎛
⎝
⎞
⎠
R1 =
OUT -1 · R2 =
- 1 · 59kΩ = 88.5kΩ
⎠
REF
The AAT2506, combined with an external feedfor-
ward capacitor (C8 in Figures 2 and 5), delivers
enhanced transient response for extreme pulsed
load applications. The addition of the feedforward
capacitor typically requires a larger output capaci-
tor C1 for stability.
124
137
187
267
Table 2: Adjustable Resistor Values For Use
With 0.6V Step-Down Converter.
LX1
VOUTBUCK
R1
Table 3
C7
0.01µF
C9
n/a
U1
C81
AAT2506
PGND SGND
1
2
3
4
5
6
12
11
10
9
C1
22µF1
R2
59k
C2
10µF
LX
VP
FB
EN
L1
Table 3
3
2
1
VIN1
VCC ENLDO
3
2
1
Buck Enable
8
IN
GND
BYP
7
3
2
1
OUT
LDO Input
C3
10µF
C4
4.7µF
C5
10nF
LDO Enable
GND
GND
VOUTLDO
Figure 5: AAT2506 Evaluation Board Schematic.
1. For step-down converter, enhanced transient configuration C8 = 100pF and C1 = 10uF.
18
2506.2005.12.1.0
AAT2506
1MHz Step-Down Converter/LDO Regulator
Given the total losses, the maximum junction tem-
perature can be derived from the θJA for the
TDFN33-12 package which is 50°C/W.
Thermal Calculations
There are three types of losses associated with the
AAT2506 step-down converter: switching losses,
conduction losses, and quiescent current losses.
Conduction losses are associated with the RDS(ON)
characteristics of the power output switching
devices. Switching losses are dominated by the
gate charge of the power output switching devices.
At full load, assuming continuous conduction mode
(CCM), a simplified form of the step-down convert-
er and LDO losses is given by:
TJ(MAX) = PTOTAL · ΘJA + TAMB
PCB Layout
The following guidelines should be used to ensure
a proper layout.
1. The input capacitor C2 should connect as
closely as possible to VP and PGND, as shown
in Figure 4.
IOBUCK2 · (RDSON(HS) · VOBUCK + RDSON(LS) · [VIN - VOBUCK])
PTOTAL
=
VIN
2. The output capacitor and inductor should be
connected as closely as possible. The connec-
tion of the inductor to the LX pin should also be
as short as possible.
3. The feedback trace should be separate from
any power trace and connect as closely as
possible to the load point. Sensing along a
high-current load trace will degrade DC load
regulation. If external feedback resistors are
used, they should be placed as closely as pos-
sible to the FB pin. This prevents noise from
being coupled into the high impedance feed-
back node.
4. The resistance of the trace from the load return
to GND should be kept to a minimum. This will
help to minimize any error in DC regulation due
to differences in the potential of the internal sig-
nal ground and the power ground.
5. For good thermal coupling, PCB vias are
required from the pad for the TDFN paddle to the
ground plane. The via diameter should be 0.3mm
to 0.33mm and positioned on a 1.2mm grid.
6. LDO bypass capacitor (C5) should be connected
directly between pins 7 (BYP) and 8 (GND)
+ (tsw · F · IOBUCK + IQBUCK + IQLDO) · VIN + IOLDO · (VIN - VOLDO
)
IQBUCK is the step-down converter quiescent cur-
rent and IQLDO is the LDO quiescent current. The
term tsw is used to estimate the full load step-down
converter switching losses.
For the condition where the buck converter is in
dropout at 100% duty cycle, the total device dissi-
pation reduces to:
PTOTAL = IOBUCK2 · RDSON(HS) + IOLDO · (VIN - VOLDO
+ (IQBUCK + IQLDO) · VIN
)
Since RDS(ON), quiescent current, and switching
losses all vary with input voltage, the total losses
should be investigated over the complete input
voltage range.
2506.2005.12.1.0
19
AAT2506
1MHz Step-Down Converter/LDO Regulator
Step-Down Converter Design Example
Specifications
VOBUCK = 1.8V @ 400mA (adjustable using 0.6V version), Pulsed Load ∆ILOAD = 300mA
VOLDO = 3.3V @ 300mA
VIN
FS
= 2.7V to 4.2V (3.6V nominal)
= 1.0MHz
TAMB = 85°C
1.8V Buck Output Inductor
µsec
A
µsec
A
(see Table 1)
L1 = 3
⋅ VO2 = 3
⋅ 1.8V = 5.4µH
For Sumida inductor CDRH3D16, 4.7µH, DCR = 105mΩ.
⎛
⎞
1.8V
⎠
4.2V
V
L1 ⋅ F
VOBUCK
1.8
V
⎛
⎞
∆IL1 = OBUCK ⋅ 1 -
=
⋅ 1 -
= 218mA
⎝
VIN
4.7µH ⋅ 1.0MHz
⎝
⎠
∆I
2
IPKL1 = IOBUCK
+
L1 = 0.4A + 0.11A = 0.51A
PL1 = IOBUCK2 ⋅ DCR = 0.4A2 ⋅ 105mΩ = 17mW
1.8V Output Capacitor
VDROOP = 0.05V
3 · ∆ILOAD
VDROOP · FS
3 · 0.3A
COUT
=
=
= 18µF
0.05V · 1MHz
(VOBUCK) · (VIN(MAX) - VOBUCK
L1 · F · VIN(MAX)
)
1
1.8V · (4.2V - 1.8V)
1
·
= 63mArms
IRMS
=
·
=
4.7µH · 1.0MHz · 4.2V
2· 3
2· 3
Pesr = esr · IRMS2 = 5mΩ · (63mA)2 = 20µW
20
2506.2005.12.1.0
AAT2506
1MHz Step-Down Converter/LDO Regulator
Input Capacitor
Input Ripple VPP = 25mV
1
1
CIN =
=
= 4.75µF
⎛
VPP
⎞
⎠
⎛ 25mV
⎝ 0.4A
⎞
- ESR · 4 · FS
- 5mΩ · 4 · 1MHz
⎝ IOBUCK
⎠
IOBUCK
IRMS
=
= 0.2Arms
2
P = esr · IRMS2 = 5mΩ · (0.2A)2 = 0.2mW
AAT2506 Losses
IOBUCK2 · (RDSON(HS) · VOBUCK + RDSON(LS) · [VIN - VOBUCK])
PTOTAL
=
VIN
+ (tsw · F · IOBUCK + IQBUCK + IQLDO) · VIN + (VIN - VLDO) · ILDO
0.42 · (0.725Ω · 1.8V + 0.7Ω · [4.2V - 1.8V])
4.2V
=
+ (5ns · 1.0MHz · 0.4A + 50µA +125µA) · 4.2V + (4.2V - 3.3V) · 0.3A = 392mW
TJ(MAX) = TAMB + ΘJA · PLOSS = 85°C + (50°C/W) · 392mW = 105°C
2506.2005.12.1.0
21
AAT2506
1MHz Step-Down Converter/LDO Regulator
Ω
Ω
VOUT (V)
R1 (k )
R1 (k )
L1 (µH)
Adjustable Version
1
R2 = 59kΩ
R2 = 221kΩ
(0.6V device)
0.8
19.6
29.4
39.2
49.9
59.0
68.1
78.7
88.7
118
75.0
113
150
187
221
261
301
332
442
464
523
715
1000
4.7
4.7
0.9
1.0
4.7
1.1
4.7
1.2
4.7
1.3
4.7
1.4
4.7
1.5
4.7
1.8
4.7
1.85
2.0
124
137
187
267
4.7
4.7 or 6.8
10
2.5
3.3
10
VOUT (V)
R1 (kΩ)
L1 (µH)
Fixed Version
R2 Not Used
0.6-3.3V
0
4.7
Table 3: Evaluation Board Component Values.
Inductance
(µH)
Max DC
Current (A)
DCR
(Ω)
Size (mm)
LxWxH
Manufacturer
Part Number
Type
Sumida
CDRH3D16-4R7
CDRH3D16-100
LQH32CN4R7M23
LQH32CN4R7M33
LQH32CN4R7M53
LPO6610-472
LPO3310-472
SDRC10-4R7
4.7
10
0.90
0.55
0.45
0.65
0.65
1.10
0.80
1.53
1.30
0.98
1.77
0.11
0.21
4.0x4.0x1.8
4.0x4.0x1.8
2.5x3.2x2.0
2.5x3.2x2.0
2.5x3.2x1.55
5.5x6.6x1.0
3.3x3.3x1.0
4.5x3.6x1.0
5.7x4.4x1.0
3.1x3.1x1.85
5.2x5.2x1.8
Shielded
Shielded
Sumida
MuRata
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
0.20
Non-Shielded
Non-Shielded
Non-Shielded
1mm
MuRata
0.15
MuRata
0.15
Coilcraft
Coilcraft
Coiltronics
Coiltronics
Coiltronics
Coiltronics
0.20
0.27
1mm
0.117
0.122
0.122
0.082
1mm Shielded
1mm Shielded
Shielded
SDR10-4R7
SD3118-4R7
SD18-4R7
Shielded
Table 4: Typical Surface Mount Inductors.
1. For reduced quiescent current R2 = 221kΩ.
22
2506.2005.12.1.0
AAT2506
1MHz Step-Down Converter/LDO Regulator
Manufacturer
Part Number
Value
Voltage
Temp. Co.
Case
MuRata
TDK
GRM21BR60J226ME39
C2012X5R0J226K
JMK212BJ226KL
22µF
22µF
22µF
6.3V
6.3V
6.3V
X5R
X5R
X5R
0805
0805
0805
Taiyo-Yuden
Table 5: Surface Mount Capacitors.
2506.2005.12.1.0
23
AAT2506
1MHz Step-Down Converter/LDO Regulator
Ordering Information
Voltage
Package
TDFN33-12
TDFN33-12
TDFN33-12
TDFN33-12
TDFN33-12
TDFN33-12
TDFN33-12
TDFN33-12
TDFN33-12
Buck Converter
LDO
3.3V
3.0V
2.8V
2.7V
2.5V
1.8V
1.5V
3.0V
2.7V
Marking1
Part Number (Tape and Reel)2
AAT2506IWP-AQ-T1
Adj - 0.6V
Adj - 0.6V
Adj - 0.6V
Adj - 0.6V
Adj - 0.6V
Adj - 0.6V
Adj - 0.6V
1.2V
QQXYY
1.8V
All AnalogicTech products are offered in Pb-free packaging. The term “Pb-free” means
semiconductor products that are in compliance with current RoHS standards, including
the requirement that lead not exceed 0.1% by weight in homogeneous materials. For more
information, please visit our website at http://www.analogictech.com/pbfree.
Legend
Voltage
Code
Adjustable
(0.6V)
A
1.2
1.5
1.8
1.9
2.5
2.6
2.7
2.8
2.85
2.9
3.0
3.3
E
G
I
Y
N
O
P
Q
R
S
T
W
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
24
2506.2005.12.1.0
AAT2506
1MHz Step-Down Converter/LDO Regulator
Package Information
TDFN33-12
Index Area
(D/2 x E/2)
Detail "B"
0.3 0.10 0.16 0.375 0.125
0.075 0.075
0.1 REF
3.00 0.05
Detail "A"
1.70 0.05
Top View
Bottom View
Pin 1 Indicator
(optional)
7.5° 7.5°
Detail "B"
Option A:
Option B:
C0.30 (4x) max
Chamfered corner
R0.30 (4x) max
Round corner
0.05 0.05
Detail "A"
Side View
2506.2005.12.1.0
25
AAT2506
1MHz Step-Down Converter/LDO Regulator
© Advanced Analogic Technologies, Inc.
AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights,
or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice.
Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. AnalogicTech
warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with AnalogicTech’s standard warranty. Testing and other quality con-
trol techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed.
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830 E. Arques Avenue, Sunnyvale, CA 94085
Phone (408) 737-4600
Fax (408) 737-4611
26
2506.2005.12.1.0
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