AAT1130IJQ-1.8-T1 [ANALOGICTECH]
Switching Regulator/Controller,;
| 型号： | AAT1130IJQ-1.8-T1 |
| 厂家： | 
ADVANCED ANALOGIC TECHNOLOGIES |
| 描述： | Switching Regulator/Controller, |
| 文件： | 总21页 (文件大小：4312K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PRODUCT DATASHEET
AAT1130
TM
SwitchReg
2.5MHz 500mA Step-Down DC/DC Converter
General Description
Features
The AAT1130 SwitchReg™ is a member of AnalogicTech’s
Total Power Management IC™ product family. It is a
fixed-frequency (during steady-state operation), cur-
rent-mode step-down converter. The unique architecture
improves transient response while allowing tiny passive
LC filter components. The high switching frequency (up
to 2.5MHz) keeps output voltage ripple low.
• 2.5MHz Switching Frequency
• Input Voltage Range: 2.7V to 5.5V
• Output Voltage Range: 0.6V to 1.8V
• High 92% Peak Efficiency (VIN = 3.6V, VOUT = 1.8V)
• Low 60ꢀA Quiescent Current
• 500mA Maximum Continuous Output Current
• Fast Transient Response with Small LC Output Filter
Components
The AAT1130 delivers up to 500mA of output current,
while consuming only 60μA of quiescent current. The
current-mode control circuit operates at a fixed switch-
ing frequency in steady-state operation. It allows the
control circuit to react nearly instantly for improved tran-
sient response and is stable with LC components as
small as 1ꢀH and 4.7ꢀF. The AAT1130 regulates an out-
put voltage between 0.6V and 1.8V from an input volt-
age of 2.7V to 5.5V. The AAT1130 is available in either
fixed or adjustable output regulation voltage options, for
the adjustable version the output voltage is set by an
external resistor voltage divider circuit. Internal MOSFET
switches reduce the overall solution size while maintain-
ing high efficiency over a wide load current range.
• Fixed and Adjustable Output Voltage Options
• Internal Soft-Start
• Anti-RingingSwitchtoReduceEMIDuringDiscontinuous
Conduction Mode Operation
• Over-Temperature Protection
• Valley Current Limit Protection
• SC70JW-10 or 0.9x1.2mm WLCSP Package
• -40°C to 85°C Temperature Range
Applications
• Microprocessor/DSP Core and I/O
• Mobile Phones
• PDAs and Handheld Computers
• Digital Cameras
• Portable Music Players
• Handheld Games
The AAT1130 is available in a space-saving 2.0x2.2mm
SC70JW-10 package or a 6-pin wafer-level chip scale
(WLCSP) package, and is rated over the -40°C to 85°C
temperature range.
• Handheld Instruments
Typical Application
Output:1.2V,
500mA max
L = 1μH
Input:
VCC/VP
LX
2.7V to 5.5V
AAT1130-12
(SC70JW)
CIN
VOUT
COUT = 4.7μF
PGND
EN
GND
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1
PRODUCT DATASHEET
AAT1130
TM
SwitchReg
2.5MHz 500mA Step-Down DC/DC Converter
Pin Descriptions
SC70JW-10
WLCSP-6
Adj.
Fixed
Adj.
Fixed
Symbol Function
Output voltage feedback input. FB senses the output voltage
through a resistor voltage divider circuit. Connect the voltage
divider from the output voltage to FB. The feedback threshold is
0.6V. (Adjustable output voltage versions only)
1
n/a
6
n/a
FB
Output voltage feedback input. VOUT senses the output voltage.
Connect VOUT to the output voltage node to regulate the output
voltage.
2
3
4
2
3
4
4
2
2
6
4
2
VOUT
VCC
VP
Input supply voltage. Connect VCC to the input supply voltage.
Power input supply voltage. Connect VP to the VCC pin, and to the
input supply voltage. Bypass VP to PGND with a 2.2ꢀF or greater
capacitor.
Switching node. Connect the LC filter between LX and the load. LX
is internally connected to the drain of the p-channel MOSFET switch
and n-channel MOSFET synchronous rectifier.
5
5
1
1
LX
6
1
6
5
3
5
3
EN
Enable input. Active logic high.
Power ground. Connect PGND to GND at a single point as close to
the AAT1130 as possible.
n/a
PGND
Ground. For fixed version, connect GND to PGND at a single point
as close to the AAT1130-xx as possible.
7, 8, 9, 10
7, 8, 9, 10
3
3
GND
Pin Configuration
SC70JW-10
(Top View)
Adjustable Output
Voltage Version
Fixed Output
Voltage Version
1
2
3
4
5
12
11
10
9
1
2
3
4
5
10
9
FB
VOUT
VCC
VP
GND
GND
GND
GND
EN
EN
VOUT
VCC
VP
GND
GND
GND
GND
PGND
8
7
8
6
LX
LX
WLCSP-6
(Top View)
Adjustable Output
Voltage Version
Fixed Output
Voltage Version
1
2
1
2
LX
GND/PGND
EN
VP/VCC
VOUT
FB
LX
VP
3
5
4
6
3
5
4
6
GND/PGND
EN
VCC
VOUT
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1130.2009.03.1.4
PRODUCT DATASHEET
AAT1130
TM
SwitchReg
2.5MHz 500mA Step-Down DC/DC Converter
Absolute Maximum Ratings1
Symbol
Description
Value
Units
VVCC, VVP
VLX
VCC, VP to GND
LX Voltage to PGND
FB Voltage to GND
EN Voltage to GND
PGND Voltage to GND
Operating Junction Temperature Range
Maximum Soldering Temperature (at leads, 10 sec)
6.0
V
V
V
V
V
-0.3 to VVCC\VVP +0.3
-0.3 to VVCC\VVP +0.3
-0.3 to VVCC\VVP +0.3
-0.3 to 0.3
VFB
VEN
VPGND
TJ
TLEAD
-40 to 150
°C
°C
300
Thermal Information
Symbol
Description
Value
Units
SC70JW-10
WLCSP-6
SC70JW-10
WLCSP-6
625
TBD
160
TBD
PD
Maximum Power Dissipation
mW
θJA
Thermal Resistance2
°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 a FR4 board.
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PRODUCT DATASHEET
AAT1130
TM
SwitchReg
2.5MHz 500mA Step-Down DC/DC Converter
Electrical Characteristics1
VIN = 3.6V, CIN = COUT = 4.7μF, L = 1μH. TA = -40°C to 85°C, unless otherwise noted. Typical values are TA = 25°C.
Symbol Description
Conditions
Min
Typ
Max
Units
VIN
VOUT
Input Voltage
Output Voltage Range
2.7
0.6
5.5
1.8
V
V
VIN rising
Hysteresis
Not Switching
EN = AGND = PGND
2.65
V
VUVLO
UVLO Threshold
100
60
mV
μA
μA
IQ
ISHDN
Quiescent Current
Shutdown Current
90
1.0
Output Voltage Tolerance
(Fixed Output Version)
Feedback Voltage Accuracy
Valley Current Limit
High Side Switch On-Resistance
Low Side Switch On-Resistance
Switch On-Time
Minimum Off-Time
LX Leakage Current
FB Leakage Current
Startup Time
VOUT_TOL
VIN = 2.7V to 5.5V, 0 to 500mA Load
TA = 25°C, No Load
-4
4
%
VFB_ACC
ILIM
RDS(ON)H
RDS(ON)L
fON
tOFF(MIN)
ILXLEAK
IFBLEAK
tS
fS
TSD
THYS
VEN(L)
VEN(H)
IEN
0.59
550
0.6
650
0.35
0.25
120
75
0.61
V
mA
Ω
Ω
VIN = 3.6V, VOUT = 1.2V
ns
ns
μA
μA
μs
MHz
°C
°C
V
VIN = 5.5, VLX = 0 to VIN
1
0.2
VFB = 5.5V, VEN = 0V, Adj Only
From EN Asserted to Output Regulation
VOUT = 1.2V, 500mA Load
150
2.5
140
15
Switching Frequency
Over-Temperature Shutdown Threshold
Over-Temperature Shutdown Hysteresis
Enable Threshold Low
Enable Threshold High
Enable Pin Current
0.6
1.0
1.4
-1.0
V
μA
VIN = VFB =5.5V
1. The AAT1130 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization, and correla-
tion with statistical process controls.
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1130.2009.03.1.4
PRODUCT DATASHEET
AAT1130
TM
SwitchReg
2.5MHz 500mA Step-Down DC/DC Converter
Typical Characteristics
Efficiency vs. Load Current
Output Voltage Error vs. Load Current
(VOUT = 1V)
(VOUT = 1V)
100
90
80
70
60
50
40
2
VIN = 2.7V
1.5
VIN = 3.6V
1
VIN = 4.2V
0.5
VIN = 5V
0
VIN = 5.5V
-0.5
-1
VIN = 2.7V
VIN = 3.6V
30
20
10
0
-1.5
-2
V
IN = 4.2V
VIN = 5V
VIN = 5.5V
-2.5
-3
0.0001
0.0001
0.001
0.01
0.1
1
5.7
1
0.001
0.01
0.1
1
Load Current (A)
Load Current (A)
Line Regulation
Efficiency vs. Load Current
(VOUT = 1V)
(VOUT = 1.8V)
100
90
80
70
60
50
40
30
20
10
0
1
0.75
0.5
IOUT = 1mA
IOUT = 10mA
IOUT = 100mA
IOUT = 300mA
IOUT = 500mA
0.25
0
VIN = 2.7V
-0.25
-0.5
-0.75
-1
VIN = 3.6V
VIN = 4.2V
VIN = 5V
VIN = 5.5V
0.0001
0.001
0.01
0.1
1
2.7
3.2
3.7
4.2
4.7
5.2
Input Voltage (V)
Load Current (A)
Output Voltage Error vs. Load Current
Line Regulation
(VOUT = 1.8V)
(VOUT = 1.8V)
1
0.75
0.5
1
0.5
0
IOUT = 1mA
IOUT = 10mA
IOUT = 100mA
IOUT = 300mA
0.25
0
-0.5
-1
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
VIN = 5V
-0.25
-0.5
-0.75
-1
-1.5
-2
-2.5
-3
VIN = 5.5V
0.0001
0.001
0.01
0.1
2.7
3.2
3.7
4.2
4.7
5.2
5.7
Load Current (A)
Input Voltage (V)
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PRODUCT DATASHEET
AAT1130
TM
SwitchReg
2.5MHz 500mA Step-Down DC/DC Converter
Typical Characteristics
Supply Current vs. Supply Voltage
Switching Frequency vs. Input Voltage
(VOUT = 1V; CIN = COUT = 2.2µF; L = 1µH)
(Switching)
4
3.75
3.5
3.25
3
100
95
90
85
80
75
70
65
60
2.75
2.5
2.25
2
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
5.5
5.5
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Supply Voltage (V))
Input Voltage (V)
On-Time vs. Input Voltage
Switching Frequency vs. Input Voltage
(VOUT = 1V; CIN = COUT = 2.2µF; L = 1µH))
(VOUT = 1.8V; CIN = COUT = 2.2µF; L = 1.5µH))
250
3
2.75
2.5
2.25
2
200
150
100
50
1.75
1.5
1.25
1
0
2.7
3.1
3.5
3.9
4.3
4.7
5.1
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Input Voltage (V)
Input Voltage (V)
On-Time vs. Input Voltage
Switching Frequency Variation
vs. Load Current
(VOUT = 1.8V; CIN = COUT = 2.2µF; L = 1.5µH))
20
15
10
5
400
350
300
250
200
150
100
50
VIN = 2.7V
VIN = 3.3V
V
IN = 3.6V
VIN = 4.2V
VIN = 5V
VIN = 5.5V
0
-5
-10
-15
-20
0
200
250
300
350
400
450
500
550
600
2.7
3.1
3.5
3.9
4.3
4.7
5.1
Input Voltage (V)
Load Current (mA)
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1130.2009.03.1.4
PRODUCT DATASHEET
AAT1130
TM
SwitchReg
2.5MHz 500mA Step-Down DC/DC Converter
Typical Characteristics
Supply Current vs. Temperature
Output Voltage Error vs. Temperature
0.2
0.1
100
90
80
70
60
50
40
30
20
0
-0.1
-0.2
-0.3
-0.4
-0.5
-40
-15
10
35
60
85
-40
-15
10
35
60
85
Temperature (V)
Temperature (°C)
RDS(ON) vs. Temperature
Efficiency vs. Load Current
(VOUT = 1.8V Fixed)
100
90
80
70
60
50
40
30
20
10
0
450
400
350
300
250
200
150
100
50
VIN = 2.7V
V
IN = 3.6V
IN = 4.2V
V
VIN = 5V
PMOS
NMOS
VIN = 5.5V
0
0.0001
0.001
0.01
0.1
1
-40
-15
10
35
60
85
Temperature (°C)
Load Current (A)
Output Voltage Error vs. Load Current
Line Regulation
(VOUT = 1.8V Fixed)
(VOUT = 1.8V Fixed)
1
0.75
0.5
2
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
IOUT = 1mA
OUT = 10mA
1.5
I
IOUT = 100mA
IOUT = 300mA
1
0.5
0
V
IN = 5V
0.25
0
VIN = 5.5V
-0.5
-1
-0.25
-0.5
-0.75
-1.5
-2
-1
0.0001
0.001
0.01
0.1
1
2.7
3.2
3.7
4.2
4.7
5.2
5.7
Load Current (A)
Input Voltage (V)
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PRODUCT DATASHEET
AAT1130
TM
SwitchReg
2.5MHz 500mA Step-Down DC/DC Converter
Typical Characteristics
Switching Frequency vs. Output Voltage
Load Transient
(IOUT = 500mA)
(VOUT = 1.8V Fixed; VIN = 3.6V; COUT = 4.7µF; L = 1.5µH)
1.90
1.85
1.80
1.75
1.70
1.65
1.60
1.55
1.50
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
3.75
3.25
2.75
2.25
1.75
1.25
500mA
10mA
0.6
0.9
1.2
1.5
1.8
Output Voltage (V)
Time (5µs/div)
Load Transient
Load Transient
(VOUT = 1.8V Fixed; VIN = 3.6V; COUT = 4.7µF; L = 1.5µH)
(VOUT = 1.8V; VIN = 3.6V; COUT = 4.7µF; CFF = 100pF; L = 1.5µH)
1.90
1.85
1.80
1.75
1.70
1.65
1.60
1.55
1.55
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
1.90
1.85
1.80
1.75
1.70
1.65
1.60
1.55
1.50
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
300mA
300mA
100mA
100mA
Time (5µs/div)
Time (5µs/div)
Load Transient
Load Transient
(VOUT = 1.8V; VIN = 3.6V; COUT = 4.7µF; L = 1.5µH)
(VOUT = 1.8V; VIN = 3.6V; COUT = 4.7µF; CFF = 100pF; L = 1.5µH)
1.90
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1.90
1.85
1.80
1.75
1.70
1.65
1.60
1.55
1.50
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
1.85
1.80
1.75
1.70
1.65
1.60
1.55
1.50
300mA
500mA
100mA
10mA
Time (5µs/div)
Time (5µs/div)
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1130.2009.03.1.4
PRODUCT DATASHEET
AAT1130
TM
SwitchReg
2.5MHz 500mA Step-Down DC/DC Converter
Typical Characteristics
Load Transient
Load Transient
(VOUT = 1.8V; VIN = 3.6V; COUT = 4.7µF; L = 1.5µH)
(VOUT = 1.5V; VIN = 3.6V; COUT = 4.7µF; CFF = 100pF; L = 1.5µH)
1.90
1.85
1.80
1.75
1.70
1.65
1.60
1.55
1.50
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
1.60
1.55
1.50
1.45
1.40
1.35
1.30
1.25
1.20
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
500mA
500mA
10mA
10mA
Time (5µs/div)
Time (5µs/div)
Load Transient
Load Transient
(VOUT = 1.5V; VIN = 3.6V; COUT = 4.7µF; L = 1.5µH)
(VOUT = 1.5V; VIN = 3.6V; COUT = 4.7µF; CFF = 100pF; L = 1.5µH)
1.60
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
1.60
1.55
1.50
1.45
1.40
1.35
1.30
1.25
1.20
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1.55
1.50
1.45
1.40
1.35
1.30
1.25
1.20
300mA
500mA
100mA
10mA
Time (5µs/div)
Time (5µs/div)
Load Transient
Load Transient
(VOUT = 1.5V; VIN = 3.6V; COUT = 4.7µF; L = 1.5µH)
(VOUT = 1V; VIN = 3.6V; COUT = 4.7µF; CFF = 100pF; L = 1µH)
1.10
1.05
1.00
0.95
0.90
0.85
0.80
0.75
0.70
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
1.60
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1.55
1.50
1.45
1.40
1.35
1.30
1.25
1.20
300mA
400mA
100mA
100mA
Time (5µs/div)
Time (5µs/div)
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1130.2009.03.1.4
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PRODUCT DATASHEET
AAT1130
TM
SwitchReg
2.5MHz 500mA Step-Down DC/DC Converter
Typical Characteristics
Load Transient
Load Transient
(VOUT = 1V; VIN = 3.6V; COUT = 4.7µF; L = 1µH)
(VOUT = 1V; VIN = 3.6V; COUT = 4.7µF; CFF = 100pF; L = 1µH)
1.10
1.05
1.00
0.95
0.90
0.85
0.80
0.75
0.70
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
1.10
1.05
1.00
0.95
0.90
0.85
0.80
0.75
0.70
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
500mA
400mA
100mA
10mA
Time (5µs/div)
Time (5µs/div)
Load Transient
Soft-Start
(VOUT = 1V; VIN = 3.6V; COUT = 4.7µF; L = 1µH)
(VOUT = 1.8V Fixed; VIN = 3.6V; COUT = 4.7µF; L = 1.5µH)
1.10
1.05
1.00
0.95
0.90
0.85
0.80
0.75
0.70
1.6
(2V/Div)
0V
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
3.6V
1.8V
(1V/Div)
0V
500mA
200mA
(100mA/Div)
0mA
10mA
Time (5µs/div)
Time (100µs/div)
Line Transient
(VOUT = 1.8V Fixed; COUT = 4.7µF; L = 1.5µH)
1.90
1.85
1.80
1.75
1.70
1.65
1.60
1.55
1.50
6.6
6.1
5.6
5.1
4.6
4.1
3.6
3.1
2.6
Time (10µs/div)
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1130.2009.03.1.4
PRODUCT DATASHEET
AAT1130
TM
SwitchReg
2.5MHz 500mA Step-Down DC/DC Converter
Functional Block Diagram
VP
Control and
FET Driver
Logic Circuitry
VCC
Shoot
LX
Through
Protection
Current
Limit
Comparator
VILIM
PGND
[Fixed Only]
Current
Sense
Amplifier
Error
Comparator
VOUT
FB
[Adj Only]
Soft-Start
EN
+
VREF
-
GND
regulation. Soft-start eliminates any output voltage over-
shoot when the enable or the input voltage is applied.
Functional Description
The AAT1130 is a high performance 500mA 2.5MHz
(maximum switching frequency during steady-state
operation) monolithic step-down converter. It minimizes
external component size, enabling the use of a tiny 0603
inductor that is only 1mm tall, and optimizes efficiency
over the complete load range. Apart from the small
bypass input capacitor, only a small L-C filter is required
at the output. Typically, a 1ꢀH inductor and a 4.7ꢀF
ceramic capacitor are recommended for <1.2V output
voltage applications (see table of values).
Control Loop
The AAT1130 uses a current-mode control scheme that
allows it to operate at very high switching frequencies.
The current-mode control scheme operates with a fixed
on-time for a given input voltage. The on-time varies
inversely proportional to the input voltage and propor-
tional to the output voltage giving the regulator a fixed
switching frequency when in steady-state. This allows
the use of very small external inductor and capacitor.
The small size coupled with the low quiescent current
and automatic transition to variable switching frequency
mode makes it ideal for small battery operated applica-
tions.
Only three external power components (CIN, COUT, and L)
are required, for fixed output voltage options. Output
voltage is programmed with external feedback resistors,
ranging from 0.6V to 1.8V. An additional feed-forward
capacitor can also be added to the external feedback to
provide improved transient response (see Figure 1).
Light Load Operation
The input voltage range is 2.7V to 5.5V. The converter
efficiency has been optimized for all load conditions,
ranging from no load to 500mA.
The AAT1130 monitors the synchronous rectifier current
and when the current drops to zero, it turns off the syn-
chronous rectifier to emulate an actual rectifier. This
allows the regulator to operate in discontinuous conduc-
The internal error comparator and incorporated compen-
sation provide excellent transient response, load, and line
w w w . a n a l o g i c t e c h . c o m
1130.2009.03.1.4
11
PRODUCT DATASHEET
AAT1130
TM
SwitchReg
2.5MHz 500mA Step-Down DC/DC Converter
tion mode. In this mode the on-time remains the same
as it is in continuous conduction mode, and therefore the
inductor ripple current remains the same in both modes.
But reduced load current requires more time for the out-
put capacitor to discharge to the regulation voltage
reducing the switching frequency. This has the added
benefit of reducing the switching transition losses
improving efficiency at light loads.
Example:
Given that VOUT = 1.2V, then COUT > 4.24ꢀF, therefore a
4.7ꢀF capacitor is suitable.
Due to the unique control method, the “inside” current
control loop does not have the inherent instability that
plagues most fixed frequency current-mode DC-DC reg-
ulators.
Stability
Soft-Start
The AAT1130 requires no additional compensation com-
ponents to guarantee stability. The only requirement for
stability is to choose the appropriate output capacitor.
When the AAT1130 is enabled, it enters soft-start mode.
In this mode, the output voltage slowly rises over 150ꢀs
allowing the output capacitor to charge without drawing
excessive input current. This feature prevents over-
stressing the battery or other input power source.
Current-mode control simplifies compensation by con-
trolling the inductor current to regulate the output volt-
age. This approximates a single pole response in the
loop gain even though a complex pole pair exists due to
the LC filter. Therefore the crossover frequency is
approximated as the DC loop gain multiplied by the
single pole. The AAT1130 DC loop gain is a function of
the 60mΩ current sense resistor and is determined by
the equation:
Current Limit
The AAT1130 includes a cycle-by-cycle current limit to
prevent damage to itself and external circuitry. The cur-
rent limit is a valley current limit using the n-channel
synchronous rectifier to measure the current. If the syn-
chronous rectifier current is above the valley current
limit, the AAT1130 holds the synchronous rectifier on
until the current is below the limit. This allows the
AAT1130 to control the current in current limit even with
a hard shorted output.
VOUT RLOAD
0.6V 60mΩ
ALOOP(DC)
=
·
And the dominant pole frequency is:
1
Anti-Ringing Switch
fP =
2π · RLOAD · COUT
The AAT1130 includes an anti-ringing switch that dissi-
pates any energy left in the inductor when the current is
approximately zero. The anti-ringing switch turns on
when both the p-channel switch and n-channel synchro-
nous rectifier are off and the inductor current is approx-
imately zero. The switch shorts the LX and VOUT nodes
together, effectively shorting the inductor. The low on-
resistance of the anti-ringing switch dissipates any
energy left in the inductor preventing ringing at light
loads. When either the switch or synchronous rectifier
are on, the anti-ringing switch remains off.
Therefore the crossover frequency is:
fC = ALOOP(DC) · fP
VOUT
=
2π · 0.6V · 60mΩ · COUT
The only requirement for stability is that the crossover
frequency be much less than the 2.5MHz switching fre-
quency. The crossover frequency can be as high as 1/2
of the switching frequency, or 1.25MHz. Therefore calcu-
late the output capacitor by the equation:
Over-Temperature
The AAT1130 includes thermal protection that automati-
cally turns off the regulator when the die temperature
exceeds a safe level. The thermal protection turns on at
a die temperature of 140°C and has a 15°C hysteresis.
VOUT
COUT
>
2π · 0.6V · 60mΩ · 1.25MHz
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12
1130.2009.03.1.4
PRODUCT DATASHEET
AAT1130
TM
SwitchReg
2.5MHz 500mA Step-Down DC/DC Converter
A laboratory test set-up typically consists of two long
wires running from the bench power supply to the evalu-
ation board input voltage pins. The inductance of these
wires, along with the low-ESR ceramic input capacitor,
can create a high Q network that may affect converter
performance. This problem often becomes apparent in
the form of excessive ringing in the output voltage dur-
ing load transients. Errors in the loop phase and gain
measurements can also result.
Applications Information
Inductor Selection
The step-down converter uses valley current mode con-
trol with slope compensation 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 requirements.
Table 1 displays suggested inductor values for various
output voltages.
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. 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 ceram-
ic. This dampens the high Q network and stabilizes the
system.
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 satura-
tion 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 associated with the DCR and
its effect on the total converter efficiency when selecting
an inductor. See Table 3 for suggested inductor values
and vendors.
Output Capacitor
The output capacitor limits the output ripple and pro-
vides holdup during large load transitions. A 4.7ꢀF to
10ꢀF X5R or X7R ceramic capacitor typically provides
sufficient bulk capacitance to stabilize the output during
large load transitions and has the ESR and ESL charac-
teristics necessary for low output ripple.
Output
Voltage
Inductor
Value
Configuration
1V, 1.2V, 1.3V
1.5V, 1.8V
1.0ꢀH to 1.5ꢀH
1.5ꢀH to 2.2ꢀH
Adjustable and Fixed
Output Voltage
Table 1: Inductor Values for Specific Output
Voltages.
The internal voltage loop compensation also limits the
minimum output capacitor value to 4.7ꢀF. This is due to
its effect on the loop crossover frequency (bandwidth),
phase margin, and gain margin. Increased output capac-
itance will reduce the crossover frequency with greater
phase margin.
Input Capacitor
Select a 4.7ꢀF to 10ꢀF X7R or X5R ceramic capacitor for
the input. Always examine the ceramic capacitor DC
voltage coefficient characteristics when selecting the
proper value. For example, the capacitance of a 10ꢀF,
6.3V, X5R ceramic capacitor with 5.0V DC applied is
actually about 6ꢀF.
CFF
R1
FB
The input capacitor provides a low impedance loop for
the edges of pulsed current drawn by the AAT1130. Low
ESR/ESL X7R and X5R ceramic capacitors are ideal for
this function. To minimize stray inductance, the capaci-
tor 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.
R2
Figure 1: AAT1130 External Resistor
Output Voltage Programming.
The proper placement of the input capacitor (C1) can be
seen in the evaluation board layouts in Figures 4, 5, 6,
and 7.
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1130.2009.03.1.4
13
PRODUCT DATASHEET
AAT1130
TM
SwitchReg
2.5MHz 500mA Step-Down DC/DC Converter
IQ is the step-down converter quiescent current. The
term tsw is used to estimate the full load step-down con-
verter switching losses. For the condition where the
step-down converter is in dropout at 100% duty cycle,
the total device dissipation reduces to:
Feedback Resistor Selection
Resistors R1 and R2 of Figure 4 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 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 volt-
ages with R2 set to either 59kΩ for good noise immunity
or 221kΩ for reduced no load input current.
PTOTAL = IO2 · RDS(ON)H + IQ · VIN
Since RDS(ON), quiescent current, and switching losses all
vary with input voltage, the total losses should be inves-
tigated over the complete input voltage range. Given the
total losses, the maximum junction temperature can be
derived from the θJA for the SC70JW-10 package which
is 160°C/W.
V
VFB
1.5V
0.6V
R1 =
OUT -1 · R2 =
- 1 · 59kΩ = 88.5kΩ
TJ(MAX) = PTOTAL · ΘJA + TAMB
The AAT1130, combined with an external feedforward
capacitor (C3 in Figure 4), delivers enhanced transient
response for extreme pulsed load applications. The addi-
tion of the feedforward capacitor typically requires a
larger output capacitor C1 for stability.
Layout
The suggested PCB layout for the AAT1130 is shown in
Figures 6 through 13. The following guidelines should be
used to help ensure a proper layout:
R2 = 59kΩ
R1 (kΩ)
R2 = 221kΩ
R1 (kΩ)
1. The input capacitor (C1) should connect as closely as
possible to the VCC/VP and PGND/GND pins.
2. C1 and L1 should be connected as closely as possi-
ble. The connection of L1 to the LX pin should be as
short as possible.
VOUT (V)
0.9
1
29.4
39.2
49.9
59.0
68.1
78.7
88.7
118
113
150
187
221
261
301
332
442
1.1
1.2
1.3
1.4
1.5
1.8
3. The feedback trace or FB pin for adjustable output
voltage 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 possible to
the FB pin for adjustable output voltage to minimize
the length of the high impedance feedback trace.
4. The resistance of the trace from the load return to
the PGND/GND pins 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.
Table 2: Feedback Resistor Values.
Thermal Calculations
There are three types of losses associated with the
AAT1130 step-down converter: switching losses, conduc-
tion 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 con-
duction mode (CCM), a simplified form of the losses is
given by:
IO2 · (RDS(ON)H · VO + RDS(ON)L · [VIN - VO])
PTOTAL
=
VIN
+ (tsw · FS · IO + IQ) · VIN
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14
1130.2009.03.1.4
PRODUCT DATASHEET
AAT1130
TM
SwitchReg
2.5MHz 500mA Step-Down DC/DC Converter
J1 HEADER
3
C
B
2
A
1
U1
1
2
3
4
5
10
9
EN
GND
GND
VOUT
VIN
VOUT
VCC
VP
8
GND
7
GND
C1
GND
6
4.7μF
LX
PGND
AAT1130_FIXED
L1
VOUT
C2
4.7μF
VOUT
1.2V
1.8V
L1
1.2μH, 1.5μH
1.5μH, 2.2μH
Figure 2: AAT1130 Fixed Output Voltage Evaluation Board Schematic for the SC70JW-10 Package.
R2
59k
R1
C3
100pF
U1
FB
GND
1
2
3
4
5
10
9
GND
GND
GND
GND
EN
VIN
VIN
VOUT
VOUT
VCC
VP
8
7
1
C1
4.7μF
GND
6
2
3
A
LX
B
C
AAT1130_ ADJ
L1
J1 HEADER
VOUT
VOUT
1V
L1
1μH
C2
4.7μF
1.3V, 1.5V
1.8V
1.5μH
1.5μH, 2.2μH
Figure 3: AAT1130 Adjustable Output Voltage Evaluation Board Schematic for the SC70JW-10 Package.
w w w . a n a l o g i c t e c h . c o m
1130.2009.03.1.4
15
PRODUCT DATASHEET
AAT1130
TM
SwitchReg
2.5MHz 500mA Step-Down DC/DC Converter
U1
V
IN
1
2
4
5
6
VP
OUT
2.7V - 5.5V
R1
opt
VOUT
L1
1.5μH
1
3
1
VIN
EN
LX
1.2V/500mA
C3
opt
C1
4.7μF
C2
4.7μF
3
2
1
EN
GND
AAT1130-FIX
U1
AAT1130 Analogic Technologies, 2.5MHz, 500mA Buck Converter, CSP-6
Cap, MLC, 4.7μF/6.3V, 0805
C1, C2
C3
Cap, MLC, 0402 (optional)
R1
L1
Carbon Film Resistor, 0402 (optional)
LQM2HP-GO, 1.5μH, Murata, ISAT = 1.5A, DCR = 70mΩ;
or VLF3010A, 1.5μH, TDK, ISAT = 1.2A, DCR = 68mΩ
Figure 4: AAT1130 Fixed Output Voltage Evaluation Board Schematic for the WLCSP-6 Package.
U1
VIN
1
2
5
3
4
1
6
VP
OUT
LX
2.7V - 5.5V
L1
VOUT
3
2
1
1
EN
EN
1.5μH
1.2V/500mA
C1
4.7μF
C3
opt
R1
adj
C2
4.7μF
GND
FB
AAT1130-AJD
R2
59k
U1
AAT1130 Analogic Technologies, 2.5Mhz, 500mA Buck Converter, CSP-6
Cap, MLC, 4.7uF/6.3V, 0805
C1, C2
C3
Cap, MLC, 100pF/6.3V, 0402 (optional)
R1
Carbon film resistor, 0402 (adjust to output voltage)
Carbon film resistor, 59kohm, 0402
LQM2HP-GO, 1.5uH, Murata, Isat=1.5A, DCR=70mohm;
or VLF3010A, 1.5uH, TDK, Isat=1.2A, DCR=68mohm
R2
L1
Figure 5: AAT1130 Adjustable Output Voltage Evaluation Board Schematic for the WLCSP-6 Package.
w w w . a n a l o g i c t e c h . c o m
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1130.2009.03.1.4
PRODUCT DATASHEET
AAT1130
TM
SwitchReg
2.5MHz 500mA Step-Down DC/DC Converter
Figure 6: AAT1130 Fixed Output Voltage
Evaluation Board Top Side PCB Layout
for the SC70JW-10 Package.
Figure 7: AAT1130 Fixed Output Voltage
Evaluation Board Bottom Side PCB Layout
for the SC70JW-10 Package.
Figure 8: AAT1130 Adjustable Output Voltage
Evaluation Board Top Side PCB Layout
for the SC70JW-10 Package.
Figure 9: AAT1130 Adjustable Output Voltage
Evaluation Board Bottom Side PCB Layout
for the SC70JW-10 Package.
w w w . a n a l o g i c t e c h . c o m
1130.2009.03.1.4
17
PRODUCT DATASHEET
AAT1130
TM
SwitchReg
2.5MHz 500mA Step-Down DC/DC Converter
Figure 10: AAT1130 Fixed Output Voltage
Evaluation Board Top Side PCB Layout
for the WLCSP-6 Package.
Figure 11: AAT1130 Fixed Output Voltage
Evaluation Board Bottom Side PCB Layout
for the WLCSP-6 Package.
Figure 12: AAT1130 Adjustable Output Voltage
Evaluation Board Top Side PCB Layout
for the WLCSP-6 Package.
Figure 13: AAT1130 Adjustable Output Voltage
Evaluation Board Bottom Side PCB Layout
for the WLCSP-6 Package.
w w w . a n a l o g i c t e c h . c o m
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1130.2009.03.1.4
PRODUCT DATASHEET
AAT1130
TM
SwitchReg
2.5MHz 500mA Step-Down DC/DC Converter
Inductance
Rated Current
(mA)
DCR (mΩ)
Size (mm)
LxWxH
Manufacturer
Part Number/Type
(μH)
(typ)
1
1600
1500
1300
2050
1750
1600
2.8
2.45
1200
1000
1700
1100
55
70
80
45
57
76
20
25
68
100
41
77
LQM2HP_G0
1.5
2.2
1
1.5
2.2
1
2.2
1.5
2.2
1
2.5x2x1
Murata
LQH32P_N0
3.2x2.5x1.6
GLC2518
VLF3010A
VLF3010S
2.5x1.8x1.8
2.8x2.6x1
3.0x2.8x1
TDK
2.2
Table 3: Suggested Inductor Components.
Manufacturer
Part Number
Value
Voltage
Temp. Co.
Case
AVX
0603ZD225K
2.2ꢀF
2.2ꢀF
4.7ꢀF
10ꢀF
22ꢀF
2.2ꢀF
10ꢀF
22ꢀF
4.7ꢀF
10
16
10
10
10
10
10
10
10
X5R
0603
C1608X5R1C225K
C1608X5R1A475K
C2012X5R1A106K
C3216X5R1A226K
GRM188R61A225K
GRM219R61A106K
GRM31CR71A226K
LMK107BJ475KA
0603
TDK
X5R
0805
1206
0603
0805
1206
0603
X5R
Murata
X7R
X5R
Taiyo Yuden
Table 4: Suggested Capacitor Components.
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1130.2009.03.1.4
19
PRODUCT DATASHEET
AAT1130
TM
SwitchReg
2.5MHz 500mA Step-Down DC/DC Converter
Ordering Information
Output Voltage
Package
Marking1
Part Number (Tape and Reel)2
SC70JW-10
WLCSP-6
SC70JW-10
WLCSP-6
2VXXY
6XXYY
2UXXY
6YXYY
AAT1130IJQ-0.6-T13
AAT1130IUU-0.6-T13
AAT1130IJQ-1.8-T13
AAT1130IUU-1.8-T13
Adjustable
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/about/quality.aspx.
Package Information
SC70JW-10
0.40 BSC
0.225 0.075
Top View
2.00 0.20
0.100
0.45 0.10
2.10 0.30
4° 4°
7° 3°
Side View
End View
All dimensions in millimeters.
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
3. Product not available for U.S. market.
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1130.2009.03.1.4
PRODUCT DATASHEET
AAT1130
TM
SwitchReg
2.5MHz 500mA Step-Down DC/DC Converter
WLCSP-6
0.915
0.2
0.4
Bottom View
All dimensions in millimeters.
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3230 Scott Boulevard, Santa Clara, CA 95054
Phone (408) 737-4600
Fax (408) 737-4611
© 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. Except as provided in AnalogicTech’s terms and
conditions of sale, AnalogicTech assumes no liability whatsoever, and AnalogicTech disclaims any express or implied warranty relating to the sale and/or use of AnalogicTech products including liability or warranties
relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. In order to minimize risks associated with the customer’s applications, adequate
design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. Testing and other quality control 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 registered trademarks or trademarks of their respective holders.
w w w . a n a l o g i c t e c h . c o m
1130.2009.03.1.4
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