AIC2858F Datasheet, PDF (1/11 Pages) Analog Intergrations Corporation – 3A 23V Synchronous Step-Down Converter

AIC2858F
3A 23V Synchronous Step-Down Converter
 ^FEATURES
 3A Continuous Output Current
 Programmable Soft Start
 100mΩ Internal Power MOSFET Switches
 Stable with Low ESR Output Ceramic Capaci-
tors
 Up to 95% 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 AIC2858F is a synchronous step-down
regulator with an integrated Power MOSFET. It
achieves 3A 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 AIC2858F is available in a SOP-8 with
Exposed Pad Package.
 ^{TYPICAL APPLICATIONS CIRCUIT}
12V
C1
10uF
U1
2
IN
ON OFF ⁷
EN
6
COMP
4
GND
C2
10uF
Cc
3.3nF
AIC2858F
Rc
10k
C6
BS
1
SW
3 ^10nF
FB
5
SS
8
C5
10nF
L1
15uH
5V
C3
22uF
C4
22uF
R1
44.2k
R2
10k
Analog Integrations Corporation
Typical Application Circuit
Si-Soft Research Center
3A1, No.1, Li-Hsin Rd. I, Science Park, Hsinchu 300, Taiwan, R.O.C.
TEL: [phone]
FAX: [phone]
DS-2858FG-01 20120103
www.analog.com.tw
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