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AAT1142 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 AAT1142
기능 Voltage-Scaling Step-Down Converter
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AAT1142 데이터시트, 핀배열, 회로
AAT1142
800mA Voltage-Scaling Step-Down Converter
General Description
Features
SwitchReg
The AAT1142 SwitchReg is a dynamically pro-
grammable 2.2MHz step-down converter with an
input voltage range of 2.7V to 5.5V and output from
• VIN Range: 2.7V to 5.5V
• VOUT Programmable Range: 0.6V to 2.0V
• Dynamic Voltage Management:
0.6V to 2.0V. Its low supply current, high level of
— 50mV Output Resolution
integration, and small footprint make the AAT1142
— Fast, Stable Response
the ideal choice for microprocessor core power in
• Serial Control Options:
systems such as smartphones.
— I2C Two-Wire Interface
The 2.2MHz switching frequency allows the use of
a small external inductor and capacitors. Peak cur-
rent mode control and internal compensation pro-
vide stable operation and fast voltage response
without over/undershoot or ringing.
The AAT1142 delivers up to 800mA of output current
while consuming 35µA of typical no load quiescent
current. Dynamic Voltage Management is provided
through I2C or AnalogicTech's S2Cwire™ (Simple
Serial Control™) single wire interface. The user can
program the output from 0.6V to 2.0V in 50mV steps.
— S2Cwire Single-Wire Interface
• 800mA Output Current
• Up to 93% Efficiency
• Line, Load Regulation Less Than ±0.5%
• 2.2MHz Switching Frequency
• Ultra-Small External Filter
• Low 35µA No Load Quiescent Current
• 100% Duty Cycle Low Dropout Operation
• Internal Soft Start
• Over-Temperature Protection
• Current Limit Protection
• Multi-Function MODE/SYNC Pin:
The AAT1142 optimizes power efficiency through-
out the load range via PWM/PFM mode. Pulling
the MODE/SYNC pin high enables PWM Onlywww.DataSheet4U.com
mode, maintaining constant frequency and low
noise across the operating range. Alternatively, the
— PFM/PWM for High Efficiency
— PWM Only for Low Noise
— Clock Input to Synchronize to System Clock
TSOPJW-12 or TDFN33-12 Package
Temperature Range: -40°C to +85°C
converter may be synchronized to an external
clock input via the MODE/SYNC pin. Over-temper-
ature and short-circuit protection safeguard the
Applications
AAT1142 and system components from damage.
The AAT1142 is available in a Pb-free, space-sav-
ing 2.85x3.0x1.0mm TSOPJW-12 package or a
Pb-free, low-profile 3x3x0.8mm TDFN33-12 pack-
age. The device is rated over the -40°C to +85°C
temperature range.
• Camcorders
• Cellular Phones and Smartphones
• Digital Still Cameras
• Handheld Instruments
• Microprocessor / DSP Core
• MP3, Portable Music, and Portable Media
Players
Typical Application
• PDAs and Handheld Computers
I 2C
S2Cwire*
VIN: 2.7V to 5.5V
C2
4.7µF
VIN LX
AAT1142
FB
MODE/SYNC
SDA
SCL
EN/SET
AGND
PGND
VOUT: 0.6V to 2.0V
800mA Maximum
L1
2.2µH
C1
10µF
Efficiency vs. Load
(VOUT = 1.8V)
100
90 VIN = 3.6V VIN = 2.7V
80
70
VIN = 4.2V
60
VIN = 5.0V
50
40
PWM Only
Mode
30
0 1 10 100
1000
*Optional S2Cwire or I2C Input
Output Current (mA)
1142.2006.07.1.0
1




AAT1142 pdf, 반도체, 판매, 대치품
AAT1142
800mA Voltage-Scaling Step-Down Converter
Electrical Characteristics1
L = 2.2µH, CIN = COUT = 10µF, VIN = 3.6V, TA = -40°C to +85°C, unless otherwise noted. Typical values are
at TA = 25°C.
Symbol Description
Step-Down Converter
VIN Input Voltage
VUVLO
UVLO Threshold
VOUT
VOUT
VSLEW
IQ
ISHDN
ILIM
RDS(ON)H
RDS(ON)L
ILXLEAK
ΔVOUT/
VOUT*ΔVIN
ROUT
TS
FOSC
FSYNC
TSD
THYS
Output Voltage Tolerance
VOUT Programmable Range
Output Voltage Programming
Slew Rate
Quiescent Current
Shutdown Current
P-Channel Current Limit
High Side Switch On Resistance
Low Side Switch On Resistance
LX Leakage Current
Line Regulation
Output Impedance
Start-Up Time
Oscillator Frequency
SYNC Frequency Range
Over-Temperature Shutdown
Threshold
Over-Temperature Shutdown
Hysteresis
Conditions
VIN Rising
Hysteresis
VIN Falling
IOUT = 0mA to 800mA,
VIN = 2.7V to 5.5V
COUT = 10µF
No Load
EN/SET = AGND = PGND
VIN = 5.5V, VLX = 0V to VIN
VIN = 2.7V to 5.5V
From Enable to Output Regulation
Min
2.7
2.0
-3.0
0.6
250
1.0
Typ
250
10
35
1.0
0.29
0.24
0.2
100
2.2
140
15
Max Units
5.5 V
2.7 V
mV
V
3.0 %
2.0 V
mV/µs
70 µA
1.0 µA
A
Ω
Ω
1 µA
%/V
kΩ
µs
MHz
3.0 MHz
°C
°C
1. The AAT1142 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.
4 1142.2006.07.1.0

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AAT1142 전자부품, 판매, 대치품
AAT1142
800mA Voltage-Scaling Step-Down Converter
Typical Characteristics
Efficiency vs. Load
(VOUT = 1.8V)
100
90 VIN = 3.6V VIN = 2.7V
80
70
VIN = 4.2V
60
VIN = 5.0V
50
40
PWM Only
Mode
30
0
1 10 100
Output Current (mA)
1000
2.0
1.6
1.2
0.8
0.4
0.0
-0.4
-0.8
-1.2
-1.6
-2.0
0
DC Regulation
(VOUT = 1.8V)
VIN = 5.0V
VIN = 4.2V
VIN = 2.7V
VIN = 3.6V
1 10 100
Output Current (mA)
1000
Soft Start
(VIN = 3.6V; VOUT = 1.8V; IOUT = 800mA)
4.0 3.5
3.0 3
2.0 2.5
1.0 2
0.0 1.5
-1.0 1
-2.0 0.5
-3.0 0
-4.0 -0.5
Time (50µs/div)
1.00
0.75
0.50
0.25
0.00
-0.25
-0.50
-0.75
-1.00
2.5
Line Regulation
(VOUT = 1.0V)
IOUT = 650mA
IOUT = 100mA
IOUT = 0mA
3.0 3.5 4.0 4.5 5.0 5.5
Input Voltage (V)
Output Voltage Accuracy vs. Temperature
(VIN = 3.6V; VOUT = 1.0V; IOUT = 400mA)
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80
Temperature (°C)
Switching Frequency vs. Temperature
(VIN = 3.6V; VOUT = 1.0V; IOUT = 400mA)
4.0
2.0
0.0
-2.0
-4.0
-6.0
-8.0
-10.0
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80
Temperature (°C)
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