RT8128A Datasheet, PDF (1/15 Pages) Richtek Technology Corporation – High Efficiency Synchronous Buck PWM Controller

®
RT8128A/C
High Efficiency Synchronous Buck PWM Controller
General Description
The RT8128A/C PWM controller provides high efficiency,
excellent transient response, and high DC output accuracy
needed for CPU core, I/O, and chipset RAM supplies in
notebook computers.
Richtek Mach Response^TM technology is specifically
designed for providing 100ns “instant-on” response to
load transients while maintaining a relatively constant
switching frequency.
The RT8128A/C achieves high efficiency at a reduced cost
by eliminating the current sense resistor found in
traditional current mode PWMs. Efficiency is further
enhanced by its ability to drive very large synchronous
rectifier MOSFETs. The Buck conversion allows this device
to directly step down high voltage batteries at the highest
possible efficiency. The RT8128A/C is designed for CPU
core, chipset, DRAM, or other low voltage supplies as
low as 0.6V.
Features
 Richtek Mach Response^TM Technology
 VCC Input Range : 4.5V to 13.2V
 VOUT Operating Range : 0.6V to 5V
 Power Stage Input Range : 2.5V to 24V
 Shutdown Current <10μA
 Operating Frequency : Fixed 300kHz
 Diode Emulation Mode (RT8128A)
 VIN Detection
 Pinless LGATE Over-Current Setting (LGOCS)
 Power Good Indication
 Embedded Bootstrap Switch
 Current Limit with Low-Side Current Sense Scheme
 1% High Accuracy Internal V_REF = 0.6V
 Enable Function
 OVP/UVP/OTP/Pre-OVP/OCP
 RoHS Compliant and Halogen Free
Applications
 Chipset/RAM Supply as Low as 0.6V
 Generic DC/DC Power Regulator
Simplified Application Circuit
V_CC
5V
PGOOD
Enable
V_IN
RT8128A/C
VCC
UGATE
BOOT
PGOOD
PHASE
LGATE/
OCSET
EN
FB
GND
V_OUT
Copyright ©2016 Richtek Technology Corporation. All rights reserved.
DS8128A/C-03 March 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1