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UC3874Q-2 Datasheet

  • UC3874Q-2

  • High Efficiency, Synchronous, Step-down Buck Controllers

  • 10頁

  • TI

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UC1874-1,-2
UC2874-1,-2
UC3874-1,-2
High Efficiency, Synchronous, Step-down (Buck) Controllers
FEATURES
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Operation to 36V Input Voltage
Fixed Frequency Average Current
Mode Control
Standby Mode for Improved
Efficiency at Light Load
Drives External N-Channel
MOSFETs for Highest Efficiency
Sleep Mode Current < 50mA
Complementary 1 Amp Outputs with
Regulated Gate Drive Voltage
LDO (Low Drop Out) Virtual 100%
Duty Cycle Operation
Non-Overlapping Gate Drives
DESCRIPTION
The UC3874 family of synchronous step-down (Buck) regulators provides
high efficiency power conversion from an input voltage range of 4.5 to 36
volts. The UC3874 is tailored for battery powered applications such as
laptop computers, consumer products, communications systems, and
aerospace which demand high performance and long battery life. The
synchronous regulator replaces the catch diode in the standard buck
regulator with a low Rds(on) N-channel MOSFET switch allowing for
significant efficiency improvements. The high side N-channel MOSFET
switch is driven out of phase from the low side N-channel MOSFET switch
by an on-chip bootstrap circuit which requires only a single external
capacitor to develop the regulated gate drive. Fixed frequency, average
current mode control provides the regulator with inherent slope
compensation, tight regulation of the output voltage, and superior load and
line transient response. Switching frequencies up to 300kHz are possible.
Light load efficiency is improved by a fully programmable standby mode, in
which the quiescent current consumption of the controller is significantly re-
duced. The reduction is achieved by disabling the MOSFET driver outputs
and the internal oscillator when the controller has sensed that the the out-
put load current has dropped a user programmable amount from full load.
(continued)
BLOCK DIAGRAM
UDG-95005-1
SLUS286A - FEBRUARY 1998 - REVISED OCTOBER 2001

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