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AAT1147 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 AAT1147
기능 Step-Down Converter
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AAT1147 데이터시트, 핀배열, 회로
AAT1147
High Efficiency, Low Noise, Fast Transient
400mA Step-Down Converter
General Description
Features
SwitchReg
The AAT1147 SwitchReg is a member of
AnalogicTech's Total Power Management IC™
(TPMIC™) product family. It is a fixed frequency
1.4MHz step-down converter with an input volt-
age range of 2.7V to 5.5V and output voltage as
low as 0.6V.
The AAT1147 is optimized for low noise portable
applications, reacts quickly to load variations, and
reaches peak efficiency at heavy load.
The AAT1147 output voltage is programmable with
external feedback resistors. It can deliver 400mA
of load current while maintaining high power effi-
ciency. The 1.4MHz switching frequency mini-
mizes the size of external components while keep-
ing switching losses low.
• VIN Range: 2.7V to 5.5V
• VOUT Adjustable from 0.6V to VIN
• 400mA Output Current
• Up to 98% Efficiency
• Low Noise, 1.4MHz Fixed Frequency PWM
Operation
• Fast Load Transient
• 150µs Soft Start
• Over-Temperature and Current Limit
Protection
• 100% Duty Cycle Low Dropout Operation
• <1µA Shutdown Current
• 8-Pin SC70JW Package
• Temperature Range: -40°C to +85°C
The AAT1147 is available in a Pb-free, space-sav-
ing 2.0x2.1mm SC70JW-8 package and is rated
Applications
over the -40°C to +85°C temperature range.
• Cellular Phones
• Digital Cameras
www.DataSheet4U.com Handheld Instruments
• Microprocessor/DSP Core /IO Power
• PDAs and Handheld Computers
• USB devices
Typical Application
VIN
C2
4.7μF
U1
AAT1147
3 VIN
LX 4
1 EN
OUT 2
5 AGND PGND 7
8 PGND PGND 6
VO = 1.8V
L1
4.7μH R1
118k
R2
59k
C1
4.7μF
1147.2006.05.1.0
1




AAT1147 pdf, 반도체, 판매, 대치품
AAT1147
High Efficiency, Low Noise, Fast Transient
400mA Step-Down Converter
Electrical Characteristics1
TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C, VIN = 3.6V.
Symbol Description
Step-Down Converter
VIN Input Voltage
VUVLO
UVLO Threshold
VOUT
VOUT
IQ
ISHDN
ILIM
RDS(ON)H
RDS(ON)L
ILXLEAK
ΔVLINEREG
VOUT
IOUT
TS
FOSC
TSD
THYS
EN
VEN(L)
VEN(H)
IEN
Output Voltage Tolerance
Output Voltage Range
Quiescent Current
Shutdown Current
P-Channel Current Limit
High Side Switch On Resistance
Low Side Switch On Resistance
LX Leakage Current
Line Regulation
Out Threshold Voltage Accuracy
Out Leakage Current
Start-Up Time
Oscillator Frequency
Over-Temperature Shutdown
Threshold
Over-Temperature Shutdown
Hysteresis
Enable Threshold Low
Enable Threshold High
Input Low Current
Conditions
VIN Rising
Hysteresis
VIN Falling
IOUT = 0 to 400mA,
VIN = 2.7V to 5.5V
No Load
EN = AGND = PGND
VIN = 5.5V, VLX = 0 to VIN,
EN = GND
VIN = 2.7V to 5.5V
0.6V Output, No Load,
TA = 25°C
0.6V Output
From Enable to Output
Regulation
VIN = VOUT = 5.5V
Min Typ Max Units
2.7 5.5
2.7
100
1.8
V
V
mV
V
-3.0 3.0 %
0.6 VIN
160 300
1.0
600
0.45
0.40
V
µA
µA
mA
Ω
Ω
1 µA
0.1 %/V
591 600 609 mV
0.2 µA
150 µs
1.0 1.4 2.0 MHz
140 °C
15 °C
0.6 V
1.4 V
-1.0 1.0 µA
1. The AAT1147 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.
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AAT1147 전자부품, 판매, 대치품
AAT1147
High Efficiency, Low Noise, Fast Transient
400mA Step-Down Converter
Typical Characteristics
220
210
200
190
180
170
160
150
140
130
120
2.5
No-Load Quiescent Current
vs. Input Voltage
25°C
85°C
-40°C
3.0 3.5 4.0 4.5 5.0
Input Voltage (V)
5.5
Line Transient Response
(40mA to 400mA; VIN = 3.6V; VOUT = 1.8V;
C1 = 4.7µF; CFF = 100pF)
2.0 1.4
1.9 1.2
1.8 1.0
1.7 0.8
1.6 0.6
1.5 0.4
1.4 0.2
1.3 400 mA
0.0
1.2 -0.2
40 mA
1.1 -0.4
1.0 -0.6
Time (25µs/div)
Line Transient Response
(40mA to 400mA; VIN = 3.6V;
VOUT = 1.8V; C1 = 4.7µF)
2.0 1.4
1.9 1.2
1.8 1.0
1.7 0.8
1.6 0.6
1.5 0.4
1.4 0.2
1.3 400mA
0.0
1.2 -0.2
40mA
1.1 -0.4
1.0 -0.6
Time (25µs/div)
Soft Start
(VIN = 3.6V; VOUT = 1.8V; IOUT = 400mA)
5.6
4.8
4.0
3.2
2.4
1.6
0.8
0.0
-0.8
-1.6
-2.4
Time (25µs/div)
3.6
3.2
2.8
2.4
2.0
1.6
1.2
0.8
0.4
0.0
-0.4
Line Response
(VOUT = 1.8V @ 400mA)
1.90
1.85
1.80
1.75
1.70
1.65
1.60
1.55
1.50
1.45
1.40
Time (25µs/div)
5.2
5.0
4.8
4.6
4.4
4.2
4.0
3.8
3.6
3.4
3.2
Output Ripple
(VIN = 3.6V; VOUT = 1.8V; IOUT = 400mA)
40
20
0
-20
-40
-60
-80
-100
-120
Time (500ns/div)
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
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