®
RT8125F/G
High Efficiency Single Synchronous Buck PWM Controller
General Description
The RT8125F/G 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 ResponseTM technology is specifically
designed for providing 100ns “instant-on” response to
load transients while maintaining a relatively constant
switching frequency.
The RT8125F/G 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 RT8125F/G provides an 1% high
accuracy 0.8V reference voltage with minimum 1mA
source/sink current for high accuracy output application.
Applications
Generic DC-DC Power Regulator
Mother Boards and Desktop Servers
Ordering Information
RT8125F/G
Package Type
QW : WDFN-10L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
OCP Scaling During Soft-Start
F : No
G : Yes
Note :
Richtek products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Features
Richtek Mach ResponseTM Technology
1% High Accuracy 0.8V Reference
VCC Input Range : 4.5V to 13.2V
VOUT Operating Range : 0.3V to 3.3V
Power Stage Input Range : 1.5V to 24V
Fixed Operating Frequency : 300kHz
VIN Detection
LG_OCSET for Current Limit
PGOOD Indicator
Embedded Bootstrap Switch
High Side Gate Driver Pull Low Resistor (10kΩ)
Current Limit with Low Side Current Sense Scheme
Enable Function with Internal Pull High Current
OVP/UVP/OTP/Pre-OVP/Current Limit
Shutdown Current <100μA
RoHS Compliant and Halogen Free
Pin Configuration
(TOP VIEW)
BOOT 1
UGATE 2
PHASE 3
LGATE/OCSET 4
VCC 5
10 REFOUT
9 REFIN
8 PGOOD
7 EN
11 6 FB
WDFN-10L 3x3
Marking Information
RT8125FGQW
LD= : Product code
LD=YM
DNN
YMDNN : Date code
RT8125GGQW
LC=YM
DNN
LC= : Product code
YMDNN : Date code
Copyright ©2017 Richtek Technology Corporation. All rights reserved.
DS8125F/G-00 October 2017
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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