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부품번호 AAT1156
기능 Step-Down DC-DC Converter
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AAT1156 데이터시트, 핀배열, 회로
AAT1156
1MHz 700mA Step-Down DC-DC Converter
General Description
The AAT1156 SwitchReg™ is a member of
AnalogicTech™'s Total Power Management IC™
(TPMIC™) product family. The step-down switching
converter is ideal for applications where high effi-
ciency is required over the full range of load condi-
tions. 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.
The AAT1156 is available in the 16-pin 3x3mm
QFN package and is rated over the -40°C to +85°C
temperature range.
Features
SwitchReg
• VIN Range: 2.7 to 5.5 Volts
• Up to 95% Efficiency
• 110mRDS(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
Applications
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Cellular Phones
Digital Cameras
MP3 Players
Notebook Computers
PDAs
Wireless Notebook Adapters
Typical Application
INPUT
R1
100
C1
10µF
C2
0.1 µF
U1
AAT1156
12 VP
FB 4
11 VP
LX 15
10 VP
LX 14
7 EN
LX 13
9 VCC
NC 16
6 LL
PGND 3
8 NC
PGND 2
5 SGND PGND 1
L1
4.7µH
R4
59k
2.5V
R3
187k
C3, C4
2 x 22µF
C1 Murata 10µF 6.3V X5R GRM42-6X5R106K6.3
C3-C4 MuRata 22µF 6.3V GRM21BR60J226ME39L X5R 0805
L1 Sumida CDRH3D16-4R7NC
AAT1156 Efficiency
(VOUT = 2.5V; L = 4.7µH; CDRH3D16)
100
95
90
85
80
75
70
65
60
55
50
1
VIN = 3.0V
VIN = 4.2V
VIN = 3.6V
10
100
Output Current (mA)
1000
1156.2005.11.1.2
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AAT1156 pdf, 반도체, 판매, 대치품
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
VIN
VOUT
VIL
VIH
VUVLO
VUVLO(HYS)
IIL
IIH
IQ
ISHDN
ILIM
RDS(ON)H
RDS(ON)L
VOUT(VOUT*VIN)
DVOUT/VOUT
FOSC
TSD
THYS
Input Voltage Range
Output Voltage Tolerance
Input Low Voltage
Input High Voltage
Under-Voltage Lockout
Under-Voltage Lockout Hysteresis
Input Low Current
Input High Current
Quiescent Supply Current
Shutdown Current
Current Limit
High Side Switch On Resistance
Low Side Switch On Resistance
Load Regulation
Line Regulation
Oscillator Frequency
Over-Temperature Shutdown
Threshold
Over-Temperature Shutdown
Hysteresis
VIN = VOUT + 0.2 to 5.5V,
IOUT = 0 to 700mA
VIN Rising, VEN = VCC
VIN Falling, VEN = VCC
VIN = VFB = 5.5V
VIN = VFB = 0V
No Load, LL = 0V; VFB = 0V,
VIN = 4.2V, TA = 25°C
VEN = 0V, VIN = 5.5V
TA = 25°C
TA = 25°C
TA = 25°C
VIN = 4.2V, ILOAD = 0 to 700mA
VIN = 2.7 to 5.5V
TA = 25°C
Min
2.7
-3
1.4
1.2
1.2
750
Typ
250
220
110
100
±0.9
±0.1
1000
140
15
Max Units
5.5 V
3%
0.6 V
V
2.5
V
mV
1.0 µA
1.0 µA
350 µA
1.0
150
150
1350
µA
A
m
m
%
%/V
kHz
°C
°C
4 1156.2005.11.1.2

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AAT1156 전자부품, 판매, 대치품
AAT1156
1MHz 700mA Step-Down DC-DC Converter
Functional Block Diagram
VCC
VP= 2.7V to 5.5V
1.0V REF
FB
OP. AMP
CMP
DH
LOGIC
1M
OSC
Temp.
Sensing
DL
LX
SGND
EN LL
PGND
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.
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
still providing sufficient DC loop gain for good load
regulation. The voltage loop crossover frequency
and phase margin are set by 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.
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.
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