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AAT1143 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 AAT1143
기능 1MHz 400mA Step-Down Converter
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AAT1143 데이터시트, 핀배열, 회로
General Description
The AAT1143 SwitchReg™ is a member of
AnalogicTech's Total Power Management IC™
(TPMIC™) product family. It is a 1MHz step-down
converter with an input voltage range of 2.7V to
5.5V and output as low as 0.6V. Its low supply cur-
rent, small size, and high switching frequency
make the AAT1143 the ideal choice for portable
applications.
The AAT1143 is available in either a fixed version
with internal feedback or a programmable version
with external feedback resistors. It can deliver
400mA of load current while maintaining a low
25µA no load quiescent current. The 1MHz switch-
ing frequency minimizes the size of external com-
ponents while keeping switching losses low. The
AAT1143 feedback and control delivers excellent
load regulation and transient response with a small
output inductor and capacitor.
The AAT1143 is designed to maintain high efficien-
cy throughout the operating range, which is critical
for portable applications.
The AAT1143 is available in a space-saving
2.0x2.1mm SC70JW-8 package and is rated over
the -40°C to +85°C temperature range.
AAT1143
1MHz 400mA Step-Down Converter
Features
SwitchReg
• VIN Range: 2.7V to 5.5V
• VOUT Adjustable Down to 0.6V
— Fixed or Adjustable Version
• 25µA No Load Quiescent Current
• Up to 95% Efficiency
• 400mA Max Output Current
• 1MHz Switching Frequency
• Soft Start
• Over-Temperature Protection
• Current Limit Protection
• 100% Duty Cycle Low-Dropout Operation
• 0.1µA Shutdown Current
• SC70JW-8 Package
• Temperature Range: -40°C to +85°C
Applications
• Cellular Phones
• Digital Cameras
• Handheld Instruments
• Microprocessor / DSP Core / IO Power
• PDAs and Handheld Computers
• USB Devices
Typical Application (Fixed Output Voltage)
VIN
C2
4.7µF
U1
AAT1143
3 VIN
LX 4
1 EN
OUT 2
5 AGND PGND 7
8 PGND PGND 6
L1
4.7µH
VO
C1
4.7µF
AAT1143 Efficiency
(VOUT = 2.5V; L = 4.7µH)
100
VIN = 3.3V
90
80
70
60
0.1
1
10 100
Output Current (mA)
1000
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AAT1143 pdf, 반도체, 판매, 대치품
AAT1143
1MHz 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
VLinereg
VOUT
IOUT
ROUT
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
Out Impedance
Oscillator Frequency
Over-Temperature Shutdown Threshold
Over-Temperature Shutdown Hysteresis
Enable Threshold Low
Enable Threshold High
Input Low Current
Conditions
Min
VIN Rising
Hysteresis
VIN Falling
IOUT = 0 to 400mA,
VIN = 2.7V to 5.5V
Fixed Output Version
Adjustable Output Version2
No Load, 0.6V Adjustable
Version
EN = AGND = PGND
2.7
1.8
-3.0
0.6
0.6
600
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
>0.6V Output
TA = 25°C
597
250
0.7
VIN = VFB = 5.5V
1.4
-1.0
Typ
100
25
0.45
0.40
600
1.0
140
15
Max Units
5.5 V
2.6 V
mV
V
+3.0 %
4.0
V
2.5
50 µA
1.0 µA
mA
1 µA
0.2 %/V
615 mV
0.2 µA
k
1.5 MHz
°C
°C
0.6 V
V
1.0 µA
1. The AAT1143 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.
2. For adjustable version with higher than 2.5V output, please consult your AnalogicTech representative.
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AAT1143 전자부품, 판매, 대치품
Typical Characteristics
Load Transient Response
(30mA - 300mA; VIN = 3.6V; VOUT = 1.8V; C1 = 4.7µF)
2.0
1.9
1.8
1.7 300mA
1.6 30mA
1.5
1.4
1.3
1.2
Time (25µs/div)
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
-0.2
AAT1143
1MHz 400mA Step-Down Converter
Line Transient
(VOUT = 1.8V @ 400mA)
1.90
1.85
1.80
1.75
1.70
1.65
1.60
1.55
1.50
Time (25µs/div)
7.0
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
Line Regulation
(VOUT = 1.8V)
0.1
0.05 IOUT = 100mA
0
-0.05
-0.1
-0.15
IOUT = 10mA
-0.2
-0.25
IOUT = 400mA
-0.3
-0.35
2.5 3.0 3.5 4.0 4.5 5.0 5.5
Input Voltage (V)
6.0
Output Ripple
(VIN = 3.6V; VOUT = 1.8V; 400mA)
40 0.9
20 0.8
0 0.7
-20 0.6
-40 0.5
-60 0.4
-80 0.3
-100
0.2
-120
0.1
Time (250ns/div)
Soft Start
(VIN = 3.6V; VOUT = 1.8V; 400mA)
4.0 3.5
3.0 3.0
2.0 2.5
1.0 2.0
0.0 1.5
-1.0 1.0
-2.0 0.5
-3.0 0.0
-4.0 -0.5
250µs/div
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