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AAT1149B PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 AAT1149B
기능 2.2MHz Fast Transient 400mA Step-Down Converter
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AAT1149B 데이터시트, 핀배열, 회로
SwitchRegTM
PRODUCT DATASHEET
AAT1149B
2.2MHz Fast Transient 400mA Step-Down Converter
General Description
The AAT1149B 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 AAT1149B can deliver 400mA of load current while
maintaining a low 45μA no load quiescent current. The
2.2MHz switching frequency minimizes the size of exter-
nal components while keeping switching losses low.
The AAT1149B maintains high efficiency throughout the
operating range, which is critical for portable applica-
tions.
The AAT1149B 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 1.8V
• 400mA Max Output Current
• Up to 98% Efficiency
• 45μA 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
AAT1149B
IN LX
EN FB
AGND PGND
PGND PGND
VOUT = 1.8V
L1 2.2µH
C1
4.7µF
1149B.2008.07.1.0
www.analogictech.com
1




AAT1149B pdf, 반도체, 판매, 대치품
SwitchRegTM
PRODUCT DATASHEET
AAT1149B
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
45
0.40
0.35
0.1
70
2.2
140
15
5.5
3.0
70
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 AAT1149B 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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1149B.2008.07.1.0

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AAT1149B 전자부품, 판매, 대치품
SwitchRegTM
PRODUCT DATASHEET
AAT1149B
2.2MHz Fast Transient 400mA Step-Down Converter
Typical Characteristics
4.00
3.00
2.00
1.00
0.00
-1.00
-2.00
-3.00
-4.00
Soft Start
(VOUT = 1.8V)
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
0.00
Time (50µs/div)
1149B.2008.07.1.0
www.analogictech.com
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