AAT1112 반도체 회로 부품 판매점
Step-Down Converter
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 Advanced Analog Technology |
General Description
The AAT1112 SwitchReg is a 1.5A step-down con-
verter with an input voltage range of 2.4V to 5.5V
and an adjustable output voltage from 0.6V to VIN.
The 1.4MHz switching frequency enables the use
of small external components. The small footprint
and high efficiency make the AAT1112 an ideal
choice for portable applications.
The AAT1112 delivers 1.5A maximum output current
while consuming only 42µA of no-load quiescent
current. Ultra-low RDS(ON) integrated MOSFETs and
100% duty cycle operation make the AAT1112 an
ideal choice for high output voltage, high current
applications which require a low dropout threshold.
The AAT1112 provides excellent transient
response and high output accuracy across the
operating range. No external compensation com-
ponents are required.
The AAT1112 is designed to maintain high efficien-
cy throughout the load range. Pulling the MODE/
SYNC pin high enables "PWM Only" mode, main-
taining constant frequency and low output ripple
across the operating range. Alternatively, the con-
verter may be synchronized to an external clock
input via the MODE/SYNC pin. Over-temperature
and short-circuit protection safeguard the AAT1112
and system components from damage.
The AAT1112 is available in a Pb-free, space-sav-
ing TDFN33-12 or 2.75x3mm TSOPJW-12 pack-
age. The product is rated over an operating tem-
perature range of -40°C to +85°C.
AAT1112
1.5A, 1.4MHz Step-Down Converter
Features
SwitchReg™
• 1.5A Maximum Output Current
• Input Voltage: 2.4V to 5.5V
• Output Voltage: 0.6V to VIN
• Up to 95% Efficiency
• 42µA No Load Quiescent Current
• No External Compensation Required
• 1.4MHz Switching Frequency
• Synchronizable to External Clock
• Optional "PWM Only" Low Noise Mode
• 100% Duty Cycle Low-Dropout Operation
• Internal Soft Start
• Over-Temperature and Current Limit
Protection
• <1µA Shutdown Current
• TSOPJW-12 or TDFN33-12 Package
• Temperature Range: -40°C to +85°C
Applications
• Cellular Phones
• Digital Cameras
• Hard Disk Drives
• MP3 Players
• PDAs and Handheld Computers
• Portable Media Players
• USB Devices
Typical Application
VIN
C2
10µF
VP LX
AAT1112
VIN
EN FB
MODE/SYNC
GND
PGND
L1
3.3µH
VOUT= 3.3V
R1
267kΩ
R2
59kΩ
C1
22µF
1112.2007.01.1.1
1
AAT1112
1.5A, 1.4MHz Step-Down Converter
Pin Descriptions
Pin #
TSOPJW-12 TDFN33-12
1 12
2 11
3 10
49
58
67
76
8, 9, 10, 11
12
4, 5
1, 2, 3
N/A EP
Symbol
LX
VP
N/C
MODE/SYNC
EN
VIN
FB
GND
PGND
Function
Switching node. Connect the output inductor to this pin. The
switching node is internally connected to the drain of both
high- and low-side MOSFETs.
Input voltage for the power switches.
Not connected.
Connect to ground for PFM/PWM mode and optimized efficien-
cy throughout the load range. Connect high for low noise
PWM operation under all operating conditions. Connect to an
external clock for synchronization (PWM only).
Enable pin. A logic low disables the converter and it con-
sumes less than 1µA of current. When connected high, it
resumes normal operation.
Power supply. Supplies power for the internal circuitry.
Feedback input pin. This pin is connected either directly to the
converter output or to an external resistive divider for an
adjustable output.
Non-power signal ground pin.
Main power ground return pin. Connect to the output and
input capacitor return.
Exposed paddle (bottom); connect to ground as closely as
possible to the device.
Pin Configuration
TSOPJW-12
(Top View)
LX
VP
N/C
MODE/SYNC
EN
VIN
1
2
3
4
5
6
12 PGND
11 GND
10 GND
9 GND
8 GND
7 FB
TDFN33-12
(Top View)
PGND 1
PGND 2
PGND 3
GND 4
GND 5
FB 6
12 LX
11 VP
10 N/C
9 MODE/SYNC
8 EN
7 VIN
2 1112.2007.01.1.1
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제조업체: Advanced Analog Technology
( aat )
AAT1112 converter
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[ AAT1112.PDF ]
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국내 전력반도체 판매점
상호 : 아이지 인터내셔날
전화번호 : 051-319-2877
[ 홈페이지 ]
IGBT, TR 모듈, SCR, 다이오드모듈, 각종 전력 휴즈
( IYXS, Powerex, Toshiba, Fuji, Bussmann, Eaton )
전력반도체 문의 : 010-3582-2743
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