AIC2857F Datasheet, PDF (1/12 Pages) Analog Intergrations Corporation – 2A 23V Synchronous Step-Down Converter

AIC2857F
2A 23V Synchronous Step-Down Converter
 ^FEATURES
 2A Continuous Output Current
 Programmable Soft Start
 130mΩ Internal Power MOSFET Switches
 Stable with Low ESR Output Ceramic Capaci-
tors
 Up to 93% Efficiency
 <1µA Supply Current in Shutdown Mode
 Fixed 340KHz Frequency
 Thermal Shutdown
 Cycle by Cycle Over Current Protection
 Wide 4.75 to 23V Operating Input Range
 Output Adjustable from 0.925V to 12V
 Under Voltage Lockout
 ^APPLICATIONS
 ^{Networking Systems such as Modems &}
Routers
 Distributed Power Systems
 Pre-Regulator for Linear Regulators.
 Set-top Box
 ^DESCRIPTION
The AIC2857F is a synchronous step-down
regulator with an integrated Power MOSFET. It
achieves 2A continuous output current over a
wide input supply range with excellent load
and line regulation.
Current mode operation provides fast transient
response and eases loop stabilization.
Fault condition protection includes cycle-by-
cycle current limiting and thermal shutdown.
Adjustable soft-start reduces the stress on the
input source and the output overshoot at turn-
on. In shutdown mode, the regulator draws
1µA or less of supply current.
The AIC2857F is available in SOP8 and SOP-
8 with Exposed Pad Package.
 ^{TYPICAL APPLICATIONS CIRCUIT}
12V
U1
C6
2
IN
BS
1
ON OFF ⁷
EN
SW
3 10nF
6
COMP
FB
5
C1
10uF
4
GND
Cc
3.9nF
AIC2857 F
SS
8
Rc
9.1k
C5
10nF
L1
15uH
5V
C3
22uF
R1
44.2k
R2
10k
Typical Application Circuit
Analog Integrations Corporation
Si-Soft Research Center
3A1, No.1, Li-Hsin Rd. I, Science Park, Hsinchu 300, Taiwan, R.O.C.
TEL: [phone]
FAX: [phone]
DS-2857FG-02
www.analog.com.tw
20120103
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