AAT1145 반도체 회로 부품 판매점
1.2A Step-Down Converter
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 Advanced Analogic Technologies |
SwitchRegTM
General Description
The AAT1145 SwitchReg™ is a 1.5MHz constant fre-
quency current mode PWM step-down converter. It is
ideal for portable equipment requiring very high current
up to 1.2A from single-cell Lithium-ion batteries while
still achieving over 90% efficiency during peak load con-
ditions. The AAT1145 also can run at 100% duty cycle
for low dropout operation, extending battery life in por-
table systems while light load operation provides very
www.DatalSohweeot4uUt.pcoumt ripple for noise sensitive applications.
The AAT1145 can supply up to 1.2A output load current
from a 2.5V to 5.5V input voltage and the output voltage
can be regulated as low as 0.6V. The high switching fre-
quency minimizes the size of external components while
keeping switching losses low. The internal slope compen-
sation setting allows the device to operate with smaller
inductor values to optimize size and provide efficient
operation.
The AAT1145 is available in adjustable (0.6V to VIN) and
fixed (1.8V) output voltage versions. The device is avail-
able in a Pb-free, 3x3mm 10-lead TDFN package and is
rated over the -40°C to +85°C temperature range.
PRODUCT DATASHEET
AAT1145
1.2A Step-Down Converter
Features
• Input Voltage Range: 2.5V to 5.5V
• Output Voltages from 0.6V to VIN
• 1.2A Output Current
• High Efficiency: Up to 95%
• 1.5MHz Constant Switching Frequency
• Low RDS(ON) Internal Switches: 0.15Ω
• Allows Use of Ceramic Capacitors
• Current Mode Operation for Excellent Line and Load
Transient Response
• Short-Circuit and Thermal Fault Protection
• Soft Start
• Low Dropout Operation: 100% Duty Cycle
• Low Shutdown Current: ISHUTDOWN < 1μA
• TDFN33-10 Package
• -40°C to +85°C Temperature Range
Applications
• Cellular Phones
• Digital Cameras
• DSP Core Supplies
• PDAs
• Portable Instruments
• Smart Phones
Typical Application
VIN 2.5V-5.5V
C1
10μF
1 EN
2 IN
LX 8
LX 7
3 AIN AAT1145-1.8 OUT 5
6 AGND
4 AGND
PGND 10
PGND 9
L1
2.2μH
VOUT
1.8V,1.2A
C2
22μF
1145.2007.11.1.1
www.analogictech.com
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SwitchRegTM
PRODUCT DATASHEET
AAT1145
1.2A Step-Down Converter
Pin Descriptions
Pin #
1
2
3
4, 6
Symbol
EN
IN
AIN
AGND
5
www.DataSheet4U.com
7, 8
9, 10
FB/OUT
LX
PGND
EP
Function
Enable pin. Active high. In shutdown, all functions are disabled drawing <1μA supply current. Do not
leave EN floating.
Power supply input pin. Must be closely decoupled to AGND with a 2.2μF or greater ceramic capacitor.
Analog supply input pin. Provides bias for internal circuitry.
Analog ground pin
FB pin (AAT1145IDE-0.6): Adjustable version feedback input. Connect FB to the center point of the
external resistor divider. The feedback threshold voltage is 0.6V.
OUT pin (AAT1145IDE-1.8): Fixed version feedback input. Connect OUT to the output voltage, VOUT.
Switching node pin. Connect the output inductor to this pin.
Power ground pin
Power ground exposed pad. Must be connected to bare copper ground plane.
Pin Configuration
TDFN-10
(Top View)
EN
IN
AIN
AGND
FB/OUT1
1
2
3
4
5
10 PGND
9 PGND
8 LX
7 LX
6 AGND
1. FB pin for the adjustable voltage version (AAT1145IDE-0.6), OUT pin for the fixed voltage version (AAT1145IDE-1.8).
2 www.analogictech.com
1145.2007.11.1.1
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제조업체: Advanced Analogic Technologies
( aat )
AAT1145 converter
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[ AAT1145.PDF ]
[ AAT1145 다른 제조사 검색 ]
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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