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AAT1120 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 AAT1120
기능 Step-Down Converter
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AAT1120 데이터시트, 핀배열, 회로
AAT1120
500mA Step-Down Converter
General Description
Features
SwitchReg
The AAT1120 SwitchReg is a 1.5MHz step-down
converter with an input voltage range of 2.7V to
5.5V and output as low as 0.6V. Its low supply
current, small size, and high switching frequency
make the AAT1120 the ideal choice for portable
applications.
The AAT1120 delivers up to 500mA of load current,
while maintaining a low 30μA no load quiescent cur-
rent. The 1.5MHz switching frequency minimizes
the size of external components, while keeping
switching losses low. The AAT1120 feedback and
control delivers excellent load regulation and tran-
sient response with a small output inductor and
capacitor.
The AAT1120 is available in a Pb-free, 8-pin, 2x2mm
STDFN package and is rated over the -40°C to
+85°C temperature range.
• VIN Range: 2.7V to 5.5V
• VOUT Range: 0.6V to VIN
• Up to 500mA Output Current
• Up to 96% Efficiency
• 30μA Typical Quiescent Current
• 1.5MHz Switching Frequency
• Soft-Start Control
• Over-Temperature and Current Limit
Protection
• 100% Duty Cycle Low-Dropout Operation
• <1μA Shutdown Current
• Small External Components
• Ultra-Small STDFN22-8 Package
• Temperature Range: -40°C to +85°C
Applications
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Bluetooth® Headsets
Cellular Phones
Digital Cameras
Handheld Instruments
Micro Hard Disk Drive
Portable Music Players
USB Devices
Typical Application
VIN
C1
4.7µF
AAT1120
VP LX
VIN
EN FB
GND PGND
VO = 1.8V
L1
3.0μH
R1
118kΩ
500mA
R2
59kΩ
C2
4.7µF
1120.2007.01.1.0
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AAT1120 pdf, 반도체, 판매, 대치품
AAT1120
500mA Step-Down Converter
Electrical Characteristics1
VIN = 3.6V, TA = -40°C to +85°C, unless otherwise noted; typical values are TA = 25°C.
Symbol
VIN
VUVLO
VOUT
VOUT
IQ
ISHDN
ILIM
RDS(ON)H
RDS(ON)L
ILXLEAK
ΔVLinereg/ΔVIN
VFB
IFB
FOSC
TS
TSD
THYS
VEN(L)
VEN(H)
IEN
Description
Input Voltage
UVLO Threshold
Output Voltage Tolerance2
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
Feedback Threshold Voltage Accuracy
FB Leakage Current
Oscillator Frequency
Startup Time
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 500mA,
VIN = 2.7V to 5.5V
No Load
EN = GND
VIN = 5.5V, VLX = 0 to VIN
VIN = 2.7V to 5.5V
VIN = 3.6V
VOUT = 1.0V
From Enable to Output
Regulation
VIN = VEN = 5.5V
Min
2.7
2.0
-3.0
0.6
0.591
1.4
-1.0
Typ
250
30
600
0.59
0.42
0.2
0.600
1.5
100
140
15
Max
5.5
2.6
Units
V
V
mV
V
3.0 %
VIN
1.0
1.0
0.609
0.2
V
μA
μA
mA
Ω
Ω
μA
%/V
V
μA
MHz
μs
°C
°C
0.6 V
V
1.0 μA
1. The AAT1120 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. Output voltage tolerance is independent of feedback resistor network accuracy.
4 1120.2007.01.1.0

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AAT1120 전자부품, 판매, 대치품
Typical Characteristics
P-Channel RDS(ON) vs. Input Voltage
1000
900 120°C 100°C
800 85°C
700
600
500 25°C
400
300
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Input Voltage (V)
Load Transient Response
(1mA to 500mA; VIN = 3.6V; VOUT = 1.8V;
COUT = 4.7µF; CFF = 100pF)
2.2
2.0
1.8
1.6 VO
1.4 IO
1.2
1.0
0.8 ILX
0.6
Time (25µs/div)
Line Response
(VOUT = 1.8V @ 500mA)
1.90
1.85 VO
1.80
1.75
1.70
1.65 VIN
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
AAT1120
500mA Step-Down Converter
N-Channel RDS(ON) vs. Input Voltage
750
700
120°C
650 100°C
600
85°C
550
500
450
400
350 25°C
300
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Input Voltage (V)
Load Transient Response
(350mA to 500mA; VIN = 3.6V; VOUT = 1.8V;
COUT = 4.7µF; CFF = 100pF)
2.0
1.9 VO
1.8
1.7 IO
1.6
1.5
1.4
1.3
1.2 ILX
1.1
1.0
Time (25µs/div)
1120.2007.01.1.0
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