SC2672 Datasheet, PDF (1/9 Pages) Semtech Corporation – Dual Synchronous Voltage Mode Controller

POWER MANAGEMENT
Description
The SC2672 is a versatile 2 phase, synchronous, volt-
age mode PWM controller that may be used in two dis-
tinct ways. The SC2672 is ideal for dual voltage inde-
pendent applications. The SC2672 features a tempera-
ture compensated voltage reference, an undervoltage
lockout over current protection and internal level-shifted,
high-side drive circuitry.
In dual switcher configuration, two feedback paths are
provided for independent control of the separate out-
puts. The device will provide a regulated output from
flexibly configured inputs (3.3V, 5V, 12V), provided 5V is
present for V_CC. The two switchers are 180° out of phase
to minimize input and output ripple.
SC2672
Dual Synchronous
Voltage Mode Controller
Features
‹ 300kHz operating frequency
‹ Soft Start
‹ Power Good output provided
‹ Undervoltage current limit
‹ Phase-shifted switchers minimize ripple
‹ High efficiency operation, >90%
‹ Programmable output(s) as low as .9V
‹ Industrial temperature range
‹ SOIC-16 pin package
‹ Bias voltage as low as 4.5V
Two Independent PWM Controllers
‹ Flexible, same or separate V
‹
IN
Independent control for each channel
‹ Independent and separate output UVLO
‹ 2 phases operating opposed for ripple reduction
(if same V used)
IN
Applications
‹ Graphics cards
‹ Peripheral add-in card
‹ Power supplies requiring two outputs
Typical Application Schematic
Revision: July 15, 2004
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