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AAT1149A PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 AAT1149A
기능 2.2MHz Fast Transient 400mA Step-Down Converter
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AAT1149A 데이터시트, 핀배열, 회로
SwitchRegTM
PRODUCT DATASHEET
AAT1149A
2.2MHz Fast Transient 400mA Step-Down Converter
General Description
The AAT1149A SwitchReg is a 2.2MHz step-down con-
verter with an input voltage range of 2.2V to 5.5V. It is
optimized to react quickly to load variations and operate
with a tiny 0603 inductor that is only 1mm tall.
The AAT1149A can deliver 400mA of load current and
operates in PWM only mode for low noise operation. The
2.2MHz switching frequency minimizes the size of exter-
nal components while keeping switching losses low.
The AAT1149A is optimized for low noise portable
applications.
The AAT1149A is available in a Pb-free, space-saving
5-pin wafer-level chip scale (WLCSP) package and is
rated over the -40°C to +85°C temperature range.
Features
• Ultra-Small 0603 Inductor (Height = 1mm)
• VIN Range: 2.2V to 5.5V
• VOUT Fixed 1.875V
• 400mA Max Output Current
• Up to 98% Efficiency
• 3mA No Load Quiescent Current
• 2.2MHz Switching Frequency
• 70μs Soft Start
• Fast Load Transient
• Over-Temperature Protection
• Current Limit Protection
• 100% Duty Cycle Low-Dropout Operation
• <1μA Shutdown Current
• 0.9x1.2mm WLCSP 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
VIN = 3.6V
C2
4.7µF
U1
AAT1149A
IN LX
EN FB
AGND PGND
PGND PGND
VOUT = 1.875V
L1 2.2µH
C1
4.7µF
1149A.2008.08.1.1
www.analogictech.com
1




AAT1149A pdf, 반도체, 판매, 대치품
SwitchRegTM
PRODUCT DATASHEET
AAT1149A
2.2MHz Fast Transient 400mA Step-Down Converter
Electrical Characteristics1
VIN = 3.6V, TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C.
Symbol Description
Step-Down Converter
VIN Input Voltage
VOUT
Output Voltage Tolerance
IQ
ISHDN
ILIM
RDS(ON)H
RDS(ON)L
Quiescent Current
Shutdown Current
P-Channel Current Limit
High Side Switch On Resistance
Low Side Switch On Resistance
ILXLEAK
LX Leakage Current
ΔVLinereg Line Regulation
TS Start-Up Time
FOSC Oscillator Frequency
TSD Over-Temperature Shutdown Threshold
THYS Over-Temperature Shutdown Hysteresis
EN
VEN(L)
VEN(H)
IEN
Enable Threshold Low
Enable Threshold High
Input Low Current
Conditions
IOUT = 0 to 400mA, VIN = 2.7V to 5.5V
No Load
VEN = GND
VIN = 5.5V, VLX = 0 to VIN, VEN = GND
VIN = 2.7V to 5.5V
From Enable to Output Regulation
TA = 25°C
VIN = VOUT = 5.5V
Min Typ Max Units
2.2
-3.0
600
3
0.40
0.35
0.1
70
2.2
140
15
5.5
3.0
6
1.0
1
1.4
-1.0
0.6
1.0
V
%
mA
μA
mA
Ω
Ω
μA
%/V
μs
MHz
°C
°C
V
V
μA
1. The AAT1149A is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization, and cor-
relation with statistical process controls.
4
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1149A.2008.08.1.1

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AAT1149A 전자부품, 판매, 대치품
SwitchRegTM
PRODUCT DATASHEET
AAT1149A
2.2MHz Fast Transient 400mA Step-Down Converter
Typical Characteristics
Load Transient
(VOUT = 1.875V; VIN = 3.6V; IOUT = 10mA to 400mA)
0.2
0
-0.2
0.5
0
0.5
0
Time (100µs/div)
4.00
3.00
2.00
1.00
0.00
-1.00
-2.00
-3.00
-4.00
Soft Start
(VOUT = 1.875V)
Time (50µs/div)
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
0.00
1149A.2008.08.1.1
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2.2MHz Fast Transient 400mA Step-Down Converter

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