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부품번호 AAT1151
기능 DC/DC Converter
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AAT1151 데이터시트, 핀배열, 회로
AAT1151
850kHz 700mA Synchronous Buck DC/DC Converter
General Description
The AAT1151 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 output load
conditions. The 2.7V to 5.5V input voltage range
makes the AAT1151 ideal for single-cell lithium-
ion/polymer battery applications. Capable of more
than 700mA with internal MOSFETs, the current-
mode controlled IC provides high efficiency using
synchronous rectification. Fully integrated compen-
sation simplifies system design and lowers external
parts count.
The device operates at a fixed 850kHz switching fre-
quency and enters PFM mode for light load current
to maintain high efficiency across all load conditions.
The AAT1151 is available in MSOP-8 and QFN33-16
packages and is rated over the -40°C to +85°C tem-
perature range.
Features
SwitchReg
• VIN Range: 2.7V to 5.5V
• Up to 95% Efficiency
• High Initial Accuracy ±1%
• 110mRDS(ON) Internal Switches
• <1µA Shutdown Current
• 850kHz Switching Frequency
• Fixed VOUT or Adjustable VOUT 1.0V
• Integrated Power Switches
• Synchronous Rectification
• Current Mode Operation
• Internal Compensation
• Stable with Ceramic Capacitors
• PWM and PFM for Optimum Efficiency for All
Load Conditions
• Internal Soft Start
• Over-Temperature Protection
• Current Limit Protection
• MSOP-8 and QFN33-16 Packages
• -40°C to +85°C Temperature Range
Typical Application
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Applications
• Cellular Phones
• Digital Cameras
• MP3 Players
• Notebook Computers
• PDAs
• USB-Powered Equipment
• Wireless Notebook Adapters
INPUT
10µF
100
0.1µF
VP
AAT1151
FB
ENABLE
LX
VCC
SGND
PGND
3.0µH
2x 22µF
OUTPUT
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AAT1151 pdf, 반도체, 판매, 대치품
AAT1151
850kHz 700mA Synchronous Buck DC/DC Converter
Electrical Characteristics1
VIN = VCC = VP = 5V, TA = -40°C to 85°C, unless otherwise noted. Typical values are at TA = 25°C.
Symbol
VIN
VOUT
VUVLO
VUVLO(HYS)
IIL
IIH
IQ
ISHDN
ILIM
RDS(ON)H
RDS(ON)L
η
VOUT (VOUT*VIN)
VOUT/VOUT
FOSC
VEN(L)
VEN(H)
TSD
THYS
Description
Input Voltage Range
Output Voltage Tolerance
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
Efficiency
Load Regulation
Line Regulation
Oscillator Frequency
Enable Threshold Low
Enable Threshold High
Over-Temperature Shutdown
Threshold
Over-Temperature Shutdown
Hysteresis
Conditions
VIN = VOUT + 0.2 to 5.5V,
IOUT = 0 to 700mA
VIN Rising
VIN Falling
VIN = VFB = 5.5V
VIN = VFB = 0 V
No Load, VFB = 0 V, VIN = 4.2V
TA = 25°C
VEN = 0 V, VIN = 5.5V
TA = 25°C
TA = 25°C
TA = 25°C
IOUT = 300mA, VIN = 3.5V
VIN = 4.2V, ILOAD = 0 to 700mA
VIN = 2.7V to 5.5V
TA = 25°C
Min
2.7
-3.0
1.2
1.2
600
1.4
Typ
250
210
110
100
92
±0.9
±0.1
850
140
15
Max
5.5
+3.0
Units
V
%
2.5 V
mV
1.0 µA
1.0 µA
300 µA
1.0
150
150
1200
0.6
µA
A
m
m
%
%
%/V
KHz
V
V
°C
°C
1. The AAT1151 is guaranteed to meet performance specifications over the -40°C to +85°C operating range and is assured by design,
characterization, and correlation with statistical process controls.
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AAT1151 전자부품, 판매, 대치품
AAT1151
850kHz 700mA Synchronous Buck DC/DC Converter
Typical Characteristics
Output Ripple
Circuit of Figure 1
20
15
VIN = 2.7V
10 VIN = 3.6V
5
VIN = 4.2V
0
1 10 100 1000
Output Current (mA)
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