AAT1156_07 [ANALOGICTECH]
1MHz 700mA Step-Down DC-DC Converter; 1MHz的700毫安降压型DC -DC转换器
| 型号： | AAT1156_07 |
| 厂家： | 
ADVANCED ANALOGIC TECHNOLOGIES |
| 描述： | 1MHz 700mA Step-Down DC-DC Converter |
| 文件： | 总15页 (文件大小：620K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AAT1156
1MHz 700mA Step-Down DC-DC Converter
™
SwitchReg
General Description
Features
The AAT1156 SwitchReg is a step-down switching
converter ideal for applications where high efficien-
cy is required over the full range of load conditions.
The 2.7V to 5.5V input voltage range makes the
AAT1156 ideal for single-cell lithium-ion/polymer
battery applications. Capable of more than 700mA
with internal MOSFETs, the current-mode con-
trolled IC provides high efficiency over a wide oper-
ating range. Fully integrated compensation simpli-
fies system design and lowers external parts count.
•
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•
•
•
•
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VIN Range: 2.7V to 5.5V
Up to 95% Efficiency
110mΩ RDS(ON) Internal Switches
<1μA Shutdown Current
1MHz Step-Down Switching Frequency
Fixed or Adjustable VOUT ≥ 0.8V
Integrated Power Switches
Current Mode Operation
Internal Compensation
Stable with Ceramic Capacitors
Internal Soft Start
Over-Temperature Protection
Current Limit Protection
16-Pin QFN 3x3mm Package
-40°C to +85°C Temperature Range
The AAT1156 is available in a Pb-free, 16-pin,
3x3mm QFN package and is rated over the -40°C
to +85°C temperature range.
Applications
•
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Cellular Phones
Digital Cameras
MP3 Players
Notebook Computers
PDAs
Wireless Notebook Adapters
Typical Application
Efficiency vs. Load Current
(VOUT = 2.5V; L = 4.7µH)
U1
AAT1156
INPUT
2.5V
VP
VP
VP
EN
VCC
LL
FB
LX
100
95
90
85
80
75
70
65
60
55
50
R3
187k
R1
100
VIN = 3.0V
L1
4.7μH
LX
C1
10μF
VIN = 4.2V
LX
VIN = 3.6V
NC
R4
59k
C3, C4
2 x 22μF
PGND
PGND
C2
0.1 μF
NC
SGND PGND
1
10
100
1000
C1 Murata 10μF 6.3V X5R GRM42-6X5R106K6.3
C3-C4 MuRata 22μF 6.3V GRM21BR60J226ME39L X5R 0805
L1 Sumida CDRH3D16-4R7NC
Output Current (mA)
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1
AAT1156
1MHz 700mA Step-Down DC-DC Converter
Pin Descriptions
Pin #
Symbol
Function
1, 2, 3
PGND
Main power ground return pin. Connect to the output and input capacitor
return. (See board layout rules.)
4
FB
Feedback input pin. This pin is connected to the converter output. It is
used to set the output of the converter to regulate to the desired value
via an internal resistive divider. For an adjustable output, an external
resistive divider is connected to this pin on the 1V model.
5
SGND
Signal ground. Connect the return of all small signal components to this
pin. (See board layout rules.)
6
7
LL
Mode selector switch. When pulled low, the device enters light load mode.
EN
Enable input pin. A logic high enables the converter; a logic low forces
the AAT1156 into shutdown mode, reducing the supply current to less
than 1μA. The pin should not be left floating.
8, 16
9
NC
Not internally connected.
VCC
Bias supply. Supplies power for the internal circuitry. Connect to input
power via low pass filter with decoupling to SGND.
10, 11, 12
13, 14, 15
EP
VP
LX
Input supply voltage for the converter power stage. Must be closely
decoupled to PGND.
Connect inductor to these pins. Switching node internally connected to
the drain of both high- and low-side MOSFETs.
Exposed paddle (bottom); connect to PGND directly beneath package.
Pin Configuration
QFN33-16
(Top View)
1
2
3
4
12
11
10
9
PGND
PGND
PGND
FB
VP
VP
VP
VCC
2
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AAT1156
1MHz 700mA Step-Down DC-DC Converter
Absolute Maximum Ratings1
Symbol
Description
Value
Units
VCC, VP
VLX
VCC, VP to GND
LX to GND
6
V
V
-0.3 to VP + 0.3
-0.3 to VCC + 0.3
-0.3 to 6
VFB
FB to GND
V
VEN
EN to GND
V
TJ
Operating Junction Temperature Range
ESD Rating2 - HBM
-40 to 150
3000
°C
V
VESD
Thermal Characteristics
Symbol
Description
Value
Units
ΘJA
PD
Maximum Thermal Resistance (QFN33-16)3
Maximum Power Dissipation (QFN33-16)4 (TA = 25°C)
50
°C/W
W
2.0
Recommended Operating Conditions
Symbol
Description
Value
Units
T
Ambient Temperature Range
-40 to 85
°C
1. Stresses above those listed in Absolute Maximum Ratings may cause 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. Human body model is 100pF capacitor discharged through a 1.5kΩ resistor into each pin.
3. Mounted on a demo board (FR4, in still air).
4. Derate 20mW/°C above 25°C.
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AAT1156
1MHz 700mA Step-Down DC-DC Converter
Electrical Characteristics
VIN = VCC = VP = 5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C.
Symbol
Description
Conditions
Min Typ Max Units
VIN
Input Voltage Range
2.7
5.5
V
V
IN = VOUT + 0.2 to 5.5V,
VOUT
Output Voltage Tolerance
-3
3
%
IOUT = 0 to 700mA
VIL
VIH
Input Low Voltage
Input High Voltage
0.6
V
V
1.4
1.2
V
IN Rising, VEN = VCC
2.5
VUVLO
Under-Voltage Lockout
V
VIN Falling, VEN = VCC
VUVLO(HYS)
Under-Voltage Lockout Hysteresis
Input Low Current
250
220
mV
μA
μA
IIL
VIN = VFB = 5.5V
VIN = VFB = 0V
1.0
1.0
IIH
Input High Current
No Load, LL = 0V; VFB = 0V,
VIN = 4.2V, TA = 25°C
VEN = 0V, VIN = 5.5V
TA = 25°C
IQ
Quiescent Supply Current
350
1.0
μA
ISHDN
ILIM
RDS(ON)H
RDS(ON)L
Shutdown Current
μA
A
Current Limit
1.2
High Side Switch On Resistance
Low Side Switch On Resistance
TA = 25°C
110
100
±0.9
±0.1
150
150
mΩ
mΩ
%
TA = 25°C
ΔVOUT(VOUT*ΔVIN) Load Regulation
VIN = 4.2V, ILOAD = 0 to 700mA
VIN = 2.7 to 5.5V
TA = 25°C
ΔVOUT/VOUT
Line Regulation
%/V
kHz
FOSC
Oscillator Frequency
Over-Temperature Shutdown
Threshold
750 1000 1350
TSD
140
°C
°C
Over-Temperature Shutdown
Hysteresis
THYS
15
4
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AAT1156
1MHz 700mA Step-Down DC-DC Converter
Typical Characteristics
Efficiency vs. Load Current
(VOUT = 2.5V; L = 4.7µH)
Efficiency vs. Load Current
(VOUT = 0.8V; L = 2.2µH)
100
90
100
95
90
85
80
75
70
65
60
55
50
VIN = 3.0V
VIN = 2.7V
80
70
VIN = 4.2V
VIN = 4.2V
60
VIN = 3.6V
VIN = 3.6V
50
40
30
20
1
10
100
1000
1
10
100
1000
Output Current (mA)
Output Current (mA)
Output Ripple
(0.8V; 10mA; VIN = 3.6V)
Soft Start
(0.8V; 700mA; VIN = 3.6V)
20
10
0
1.4
1.2
1
2
3.5
3
1.5
1
2.5
2
-10
-20
-30
-40
-50
-60
0.8
0.6
0.4
0.2
0
0.5
0
1.5
1
-0.5
-1
0.5
0
-1.5
-2
-0.2
-0.5
Time (2μμs/div)
Time (100μs/div)
Output Ripple
(0.8V; 700mA; VIN = 3.6V)
Line Transient
(IOUT = 500mA; VO = 0.8V)
20
10
3.5
3
4.4
4.2
4
60
50
40
30
20
10
0
0
2.5
2
-10
-20
-30
-40
-50
-60
3.8
3.6
3.4
3.2
3
1.5
1
0.5
0
-10
-20
2.8
-0.5
Time (20μsec/div)
Time (250ns/div)
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AAT1156
1MHz 700mA Step-Down DC-DC Converter
Typical Characteristics
Load Transient Response
(50mA to 680mA; VIN = 3.6V; VOUT = 0.8V)
No Load Supply Current vs. Input Voltage
300
0.83
0.81
0.79
0.77
0.75
85°C
250
200
150
25°C
-40°C
0.73
Ø
100
0.71
50
0
Ø
0.69
0.67
2.5
3
3.5
4
4.5
5
5.5
Time (10μμsec/div)
Input Voltage (V)
DC Regulation
(VOUT = 0.6V)
Output Voltage vs. Temperature
)
(VIN = 4.2V; VOUT = 0.8V; 400mA VOUT
0.1
0.0
3.0
2.0
1.0
VIN = 4.2V
-0.1
-0.2
-0.3
-0.4
0.0
VIN = 3.6V
VIN = 2.7V
-1.0
-2.0
-3.0
-40
-20
0
20
40
60
80
100
0.0001
0.001
0.01
0.1
1
Output Current (A)
Temperature (°°C)
Frequency vs. Temperature
(VIN = 3.6V)
P-Channel RDS(ON) vs. Input Voltage
200
180
160
140
120
100
80
1.2
1.1
1
100°C
120°C
0.9
0.8
0.7
0.6
85°C
25°C
60
40
20
0
2.5
3
3.5
4
4.5
5
5.5
-40
-20
0
20
40
60
80
100
Temperature (°°C)
Input Voltage (V)
6
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AAT1156
1MHz 700mA Step-Down DC-DC Converter
Typical Characteristics
Frequency vs. Input Voltage
N-Channel RDS(ON) vs. Input Voltage
200
180
160
1.02
1.01
1
100°C
85°C
4
120°C
25°C
4.5
140
120
100
80
0.99
0.98
0.97
0.96
0.95
0.94
60
40
20
0
2.5
3
3.5
5
5.5
2.7
3.2
3.7
4.2
4.7
5.2
5.7
Input Voltage (V)
Input Voltage (V)
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7
AAT1156
1MHz 700mA Step-Down DC-DC Converter
Functional Block Diagram
VCC
VP = 2.7V to 5.5V
1.0V REF
CMP
DH
LX
DL
OP. AMP
FB
LOGIC
1MΩ
OSC
Temp.
Sensing
SGND
EN
LL
PGND
still providing sufficient DC loop gain for good load
regulation. The voltage loop crossover frequency
and phase margin are set by the output capacitor.
Operation
Control Loop
The AAT1156 is a peak current mode step-down
converter. The inner wide bandwidth loop controls
the inductor peak current. The inductor current is
sensed through the P-channel MOSFET (high
side) and is also used for short-circuit and overload
protection. A fixed slope compensation signal is
added to the sensed current to maintain stability for
duty cycles greater than 50%. The loop appears
as a voltage-programmed current source in paral-
lel with the output capacitor.
Soft Start/Enable
Soft start increases the inductor current limit point in
discrete steps once the input voltage or enable
input is applied. It limits the current surge seen at
the input and eliminates output voltage overshoot.
When pulled low, the enable input forces the
AAT1156 into a non-switching shutdown state. The
total input current during shutdown is less than 1μA.
The voltage error amplifier output programs the
current loop for the necessary inductor current to
force a constant output voltage for all load and line
conditions. The external voltage feedback resistive
divider divides the output voltage to the error ampli-
fier reference voltage of 0.6V. The voltage error
amplifier DC gain is limited. This eliminates the
need for external compensation components, while
Power and Signal Source
Separate small signal ground and power supply
pins isolate the internal control circuitry from the
noise associated with the output MOSFET switch-
ing. The low pass filter R1 and C2 (shown in the
schematic in Figure 1) filters the input noise asso-
ciated with the power switching.
8
1156.2007.01.1.4
AAT1156
1MHz 700mA Step-Down DC-DC Converter
U1
AAT1156
Enable
Vin+
Vout+
VP
FB
LX
R3
200k
R1
100
VP
L1
4.7μH
VP
LX
R2
EN
LX
100K
C1
10μF
VCC
LL
N/C
R4
59k
C2
0.1 μF
PGND
PGND
PGND
R6
100k
C3,C4
2 x 22μF
N/C
SGND
C1 Murata 10μF 6.3V X5R GRM42-6X5R106K6.3
LL
C3, C4 MuRata 22μF 6.3V GRM21BR60J226ME396 X5R 0805
L1 Sumida CDRH3D16-4R7NC
Figure 1: AAT1156 Evaluation Board Schematic—Lithium-Ion to 2.5V Converter.
Current Limit and Over-Temperature
Protection
VOUT
VOUT
⎠
VIN
⎛
⎞
L =
L =
• 1 -
⎝
IO • k • FS
For overload conditions, the peak input current is lim-
ited. As load impedance decreases and the output
voltage falls closer to zero, more power is dissipated
internally, raising the device temperature. Thermal
protection completely disables switching when inter-
nal dissipation becomes excessive, protecting the
device from damage. The junction over-temperature
threshold is 140°C with 15°C of hysteresis.
1.5
V
1.5V
4.2V
⎛
⎞
⎠
⋅ 1 -
0.7A ⋅ 0.4 ⋅ 1MHz
⎝
L = 3.44μH
The factor "k" is the fraction of full load selected for
the ripple current at the maximum input voltage.
For ripple current at 40% of the full load current, the
peak current will be 120% of full load. Selecting a
standard value of 3.3μH gives 42% ripple current.
A 3.3μH inductor selected from the Sumida
CDRH3D16 series has a 63mΩ DCR and a 1.1A
DC current rating. At full load, the inductor DC loss
is 31mW which amounts to less than 3% loss in
efficiency for a 0.7A, 1.5V output.
Inductor
The output inductor is selected to limit the ripple cur-
rent to a predetermined value, typically 20% to 40%
of the full load current at the maximum input voltage.
Manufacturer's specifications list both the inductor
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 losses
due to a high DCR. Always consider the losses asso-
ciated with the DCR and its effect on the total con-
verter efficiency when selecting an inductor.
Input Capacitor
The primary function of the input capacitor is to pro-
vide a low impedance loop for the edges of pulsed
current drawn by the AAT1156. A low ESR/ESL
ceramic capacitor is ideal for this function. To mini-
mize stray inductance, the capacitor should be
placed as closely as possible to the IC. This keeps
the high frequency content of the input current local-
ized, minimizing radiated and conducted EMI while
facilitating optimum performance of the AAT1156.
Ceramic X5R or X7R capacitors are ideal for this
function. The size required will vary depending on
For a 0.7A, 1.5V output with the ripple set to 40%
at a maximum input voltage of 4.2V, the maximum
peak-to-peak ripple current is 280mA. The induc-
tance value required is 3.44μH.
1156.2007.01.1.4
9
AAT1156
1MHz 700mA Step-Down DC-DC Converter
the load, output voltage, and input voltage source
For an X7R or X5R ceramic capacitor, the ESR is
so low that dissipation due to the RMS current of
the capacitor is not a concern. Tantalum capacitors
with sufficiently low ESR to meet output voltage rip-
ple requirements also have an RMS current rating
well beyond that actually seen in this application.
impedance characteristics. Values range from 1μF
to 10μF. The input capacitor RMS current varies
with the input voltage and output voltage. The equa-
tion for the RMS current in the input capacitor is:
VO
VIN
⎛
VO ⎞
VIN ⎠
IRMS = IO ⋅
⋅ 1 -
⎝
Layout
Figures 2 and 3 display the suggested PCB layout
for the AAT1156. The following guidelines should
be used to help ensure a proper layout.
The input capacitor RMS ripple current reaches a
maximum when VIN is two times the output voltage,
where it is approximately one half of the load cur-
rent. Losses associated with the input ceramic
capacitor are typically minimal and are not an
issue. Proper placement of the input capacitor is
shown in the reference design layout in Figure 2.
1. The input capacitor (C1) should connect as
closely as possible to VP (Pins 10, 11, and 12)
and PGND (Pins 1, 2, and 3).
2. C3, C4, and L1 should be connected as closely
as possible. The connection from L1 to the LX
node should be as short as possible.
3. The feedback trace (Pin 4) 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.
4. The resistance of the trace from the load return
to PGND (Pins 1, 2, and 3) 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 signal ground and the power
ground.
Output Capacitor
Since there are no external compensation compo-
nents, the output capacitor has a strong effect on
loop stability. Larger output capacitance will reduce
the crossover frequency with greater phase margin.
For the 1.5V, 0.7A design using the 3.3μH inductor,
two 22μF capacitors provide a stable output. In
addition to assisting in stability, the output capacitor
limits the output ripple and provides holdup during
large load transitions. The output capacitor RMS
ripple current is given by:
5. Low pass filter R1 and C2 provide a cleaner bias
source for the AAT1156 active circuitry. C2 should
be placed as closely as possible to SGND (Pin 5)
and VCC (Pin 9).
VOUT
⋅
(VIN - VOUT
)
1
IRMS
=
⋅
L
⋅
FS VIN
⋅
2
⋅ 3
Figure 2: AAT1156 Evaluation
Board Top Side.
Figure 3: AAT1156 Evaluation
Board Bottom Side.
10
1156.2007.01.1.4
AAT1156
1MHz 700mA Step-Down DC-DC Converter
Thermal Calculations
There are three types of losses associated with the AAT1156: MOSFET switching losses, conduction losses,
and quiescent current losses. The conduction losses are due to the RDS(ON) characteristics of the internal P-
and N-channel MOSFET power devices. At full load, assuming continuous conduction mode (CCM), a simpli-
fied form of the total losses is given by:
IO2 ⋅ (RDS(ON)H ⋅ VO + RDS(ON)L ⋅ (VIN - VO))
P =
+ (tsw ⋅ FS ⋅ IO ⋅ VIN + IQ) ⋅ VIN
VIN
where IQ is the AAT1156 quiescent current.
Once the total losses have been determined, the junction temperature can be derived from the θJA for the
QFN33-16 package.
TJ = P ·
Θ
JA + TAMB
Adjustable Output
Resistors R3 and R4 of Figure 1 force the output to regulate higher than 0.6V. The optimum value for R4 is
59kΩ. Values higher than this may cause problems with stability, while lower values can degrade light load
efficiency. For a 2.5V output with R4 set to 59kΩ, R3 is 187kΩ.
V
2.5V
0.6V
⎛
⎝
⎞
⎛
⎝
⎞
O
R3 =
-1
·
R4 =
- 1
·
59kΩ = 187kΩ
V
⎠
⎠
REF
500
R4=59kΩ
450
400
350
300
250
200
150
100
50
0
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
Output Voltage (V)
Figure 4: R3 vs. VOUT for Adjustable Output Using the AAT1156.
1156.2007.01.1.4
11
AAT1156
1MHz 700mA Step-Down DC-DC Converter
Design Example
Specifications
IOUT
0.7A
IRIPPLE 40% of Full Load at Max VIN
VOUT 2.5V
VIN
FS
2.7V to 4.2V (3.6V nominal)
1MHz
TAMB 85°C
Maximum Input Capacitor Ripple:
V
VO
⎛
⎞
⎠
IRMS= IO · O · 1-
= 0.34Arms, VIN = 2 · VO
⎝
V
V
IN
IN
P = esr
·
IRMS2 = 5mΩ
·
0.342 A = 0.6mW
Inductor Selection:
VOUT
IO ⋅ k ⋅ FS
⎛
VOUT
VIN
⎞
⎠
2.5
V
2.5V
⎞
4.2V
⎠
⎛
L =
⋅ 1 -
⎝
=
⋅ 1 -
⎝
= 4.82μH
0.7A ⋅ 0.3 ⋅ 1MHz
Select Sumida inductor CDRH3D16 or CDRH4D28 4.7μH.
⎛
⎞
2.5V
⎠
4.2V
VO
L ⋅ FS
VO
VIN
2.5
V
⎛
⎞
⎠
ΔI =
⋅ 1 -
⎝
=
⋅ 1-
= 220mA
⎝
4.7μH ⋅ 1MHz
ΔI
2
IPK = IOUT
+
= 0.7A + 0.11A = 0.81A
P = IO2 ⋅ DCR = (0.7A)2 ⋅ 80mΩ = 40mW
12
1156.2007.01.1.4
AAT1156
1MHz 700mA Step-Down DC-DC Converter
Output Capacitor Ripple Current:
VOUT · (VIN - VOUT
L · FS · VIN
)
1
2.5V · (4.2V - 2.5V)
= 62mArms
4.7μH · 1MHz · 4.2V
1
·
IRMS
=
·
=
2· 3
2· 3
Pesr = esr · IRMS2 = 5mΩ · (62 mA)2 = 19μW
AAT1156 Dissipation:
IO2 • (RDS(ON)H • VO + RDS(ON)L • (VIN -VO))
PTOTAL
=
=
+ (tsw • FS • IO + IQ) • VIN
VIN
(0.7A)2 • (0.17
Ω
•
2.5V + 0.16Ω • (4.2V - 1.5V))
+ (20nsec • 1MHz • 0.7A + 300μA) • 4.2V = 0.141W
4.2V
TJ(MAX) = TAMB + ΘJA • PLOSS = 85°C + 50°C/W • 0.141W = 92°C
Efficiency vs. Load Current
(VOUT = 0.8V; L = 2.2µH)
U1
AAT1156
INPUT
0.8V
100
90
80
70
60
50
40
30
20
VP
FB
LX
R3
R1
100
19.6k
VP
VIN = 2.7V
L1
2.2μH
VP
LX
C1
10μF
VIN = 4.2V
EN
LX
VCC
LL
N/C
VIN = 3.6V
R4
59k
C3, C4
2 x 22μF
PGND
PGND
PGND
C2
0.1 μF
N/C
SGND
C1 Murata 10μF 6.3V X5R GRM42-6X5R106K6.3
1
10
100
1000
C3, C4 MuRata 22μF 6.3V GRM21BR60J226ME39L X5R 0805
L1 Sumida CDRH3D16-2R2NC
Output Current (mA)
Figure 5: 0.8V Solution.
1156.2007.01.1.4
13
AAT1156
1MHz 700mA Step-Down DC-DC Converter
Surface Mount Inductors
Max DC
Current
Size (mm)
L x W x H
Manufacturer Part Number
Value
DCR
Type
TaiyoYuden
Toko
NPO5DB4R7M
4.7μH
3.5μH
4.7μH
2.2μH
3.3μH
4.7μH
4.2μH
4.1μH
4.7μH
4.7μH
1.4A
1.34A
1.32A
1.2A
1.1A
0.9
0.038
0.073
0.072
0.050
0.063
0.080
0.031
0.057
0.041
0.025
5.9x6.1x2.8
5.0x5.0x2.0
4.7x4.7x3.0
3.8x3.8x1.8
3.8x3.8x1.8
3.8x3.8x1.8
5.7x5.7x3.0
5.7x5.7x2.0
5.0x5.0x4.7
6.3x6.3x4.7
Shielded
Shielded
Shielded
Shielded
Shielded
Shielded
Shielded
Sielded
A914BYW-3R5M-D52LC
CDRH4D28-4R7
CDRH3D16-2R2
CDRH3D16-3R3
CDRH3D16-4R7
CDRH5D28-4R2
CDRH5D18-4R1
LQH55DN4R7M03
LQH66SN4R7M03
Sumida
Sumida
Sumida
Sumida
Sumida
Sumida
MuRata
MuRata
2.2A
1.95A
2.7A
2.2A
Non-Shielded
Shielded
Surface Mount Capacitors
Manufacturer
Part Number
Value
Voltage
Temp. Co.
Case
MuRata
MuRata
MuRata
GRM40 X5R 106K 6.3
GRM42-6 X5R 106K 6.3
GRM21BR60J226ME39L
10μF
10μF
22μF
6.3V
6.3V
6.3V
X5R
X5R
X5R
0805
1206
0805
14
1156.2007.01.1.4
AAT1156
1MHz 700mA Step-Down DC-DC Converter
Ordering Information
Output Voltage
Package
Marking1
Part Number (Tape and Reel)2
0.6V (Adj VOUT ≥ 0.8V)
QFN33-16
LUXYY
AAT1156IVN-T1
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.
Package Information3
0.230 0.05
Pin 1 Identification
1
5
C0.3
Pin 1 Dot By Marking
13
9
3.000 0.05
0.500 0.05
Top View
Bottom View
0.214 0.036
Side View
All dimensions in millimeters.
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
3. The leadless package family, which includes QFN, TQFN, DFN, TDFN and STDFN, has exposed copper (unplated) at the end of the
lead terminals due to the manufacturing process. A solder fillet at the exposed copper edge cannot be guaranteed and is not required
to ensure a proper bottom solder connection.
© 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 sub-
ject 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.
AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated. All other brand and product names appearing in this document are regis-
tered trademarks or trademarks of their respective holders.
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Fax (408) 737-4611
1156.2007.01.1.4
15
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