AIC2863 Datasheet, PDF (1/10 Pages) Analog Intergrations Corporation – 3A 23V Synchronous PWM/PSM Step-Down

AIC2863
3A 23V Synchronous PWM/PSM Step-Down
Converter with High Light-load Efficiency
 ^FEATURES
 3A Continuous Output Current
 Wide 4.75V to 23V Operating Input Range
 Ouput Adjustable from 0.925V to 12V
(V_REF=0.925V Version)
 Ouput Adjustable from 0.8V to 12V
(V_REF=0.8V Version)
 Up to 84% Efficiency for Heavy Load
(Vin=12V, Vout=3.3V, Iout=3.0A)
 Up to 91% Efficiency for Moderate Load
(Vin=12V, Vout=3.3V, Iout=1.0A)
 Low Rds(on) Internal Switches: 100mΩ and
85mΩ
 <3µA Supply Current in Shutdown Mode
 340KHz/550KHz Frequency
 Programmable Soft Start
 Thermal Shutdown
 Cycle by Cycle Over Current Protection
 Under Voltage Lockout
 Short Circuit Protection
 Over Voltage Protection
 ^APPLICATIONS
 Networking Systems such as Modems & Routers
 Distributed Power Systems
 Pre-Regulator for Linear Regulators
 Set-top Box
 ^{TYPICAL APPLICATIONS CIRCUIT}
 ^DESCRIPTION
The AIC2863 is a 3A synchronous-rectified Buck
converter with integrated low Rds(on) power
MOSFETs. The AIC2863, designed with a current-
mode control scheme, can convert wide input volt-
age to the adjustable output voltage to provide ex-
cellent output voltage regulation. It is stable with
low ESR output ceramic capacitors.
For high efficiency over all load current range, the
AIC2863 is equipped with an automatic PSM/PWM
mode operation. At light load, the IC operates in the
PSM (Pulse Skipping Mode) to reduce switching
losses. At heavy load, the IC works in PWM mode
to provide high efficiency and excellent output volt-
age regulation.
The AIC2863 is also equipped with soft start and
whole protections (under-voltage, over-voltage,
over-temperature, short circuit and current-limit) in-
to a single package.
This device, available in SOP-8 package, provides
a very compact system solution with minimal exter-
nal components and PCB area.
AIC2863
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-2863G-04 20121218
www.analog.com.tw
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