RT8129A Datasheet, PDF (1/18 Pages) Richtek Technology Corporation – High Efficiency Single Synchronous Buck PWM Controller

RT8129A
High Efficiency Single Synchronous Buck PWM Controller
General Description
The RT8129A is a high efficiency single phase
synchronous buck controller with 5V/12V supply
voltage. The RT8129A integrates a Constant-On-Time
(COT) PWM controller and a MOSFET drivers with
internal bootstrap diodes, which is specifically designed
to improve converter efficiency at light load condition.
At light load condition, it automatically operates in the
diode emulation mode to reduce switching frequency
and improve conversion efficiency.
Other features include power good indication,
enable/disable control and internal soft-start function.
The RT8129A also provide protection functions
including Over Voltage Protection (OVP), Under
Voltage Protection (UVP), current limit and thermal
shutdown.
This device uses lossless low-side MOSFET RDS(ON)
current sense technique for current limit with adjustable
threshold set by connecting a resistor between the
LGATE/OCSET and GND.
With above functions, the RT8129A provides
customers a cost-effective solution for high efficiency
power conversion. The RT8129A is available in the
WDFN-10L 3x3 package.
Features
 Wide Input Voltage Range : 2.5V to 25V
 High Light Load Efficiency
 Integrated High Driving Capability N-MOSFET
Gate
 Drivers and Embedded Switching Boot Diode
 Single IC Supply Voltage : 4.5V to 13.2V
 Power-Good Indicator
 Enable/Disable Control
 Internal Soft-Start
 Programmable Current Limit Threshold
 Under Voltage Protection
 Over Voltage Protection
 Thermal Shutdown
Applications
 Motherboard, Memory/Chip-set Power
 Graphic Card, GPU/Memory Core Power
 Low Voltage, High Current DC/DC Regulator
Marking Information
5N=YM
DNN
5N= : Product Code
YMDNN : Date Code
Simplified Application Circuit
V_CC
V_PGOOD
Enable
RT8129A
VCC
BOOT
UGATE
PHASE
PGOOD LGATE/
OCSET
EN
FB
GND
V_IN
V_OUT
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS8129A-01 October 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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