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RT8238A PDF预览

RT8238A

更新时间: 2024-04-09 19:01:38
品牌 Logo 应用领域
立锜 - RICHTEK /
页数 文件大小 规格书
15页 261K
描述
Single Synchronous Buck PWM Controller

RT8238A 数据手册

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®
RT8238A  
Single Synchronous Buck PWM Controller  
General Description  
Features  
z Built in 1% 0.5V Reference Voltage  
z Adjustable 0.5V to 3.3V Output Range  
z Quick Load Step Response within 100ns  
z 4700ppm/°C Programmable Current Limit by Low  
Side RDS(ON) Sensing  
The RT8238A PWM controller provides high efficiency,  
excellent transient response, and highDC output accuracy  
needed for stepping down high voltage batteries to  
generate low voltage CPU core, I/O, and chipset RAM  
supplies in notebook computers.  
z 4.5V to 26V Battery Input Range  
z Resistor Programmable Frequency  
z Internal Ramp Current Limit Soft-Start Control  
z Drives Large Synchronous Rectifier FETs  
z Integrated Boost Switch  
The constant on-time PWM control scheme handles wide  
input/output voltage ratios with ease and provides 100ns  
instant-onresponse to load transients while maintaining  
a relatively constant switching frequency.  
The RT8238A 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 and enter diode emulation mode at  
light load condition. The Audio Skipping Mode (ASM)  
setting maintains the switching frequency above 25kHz,  
which eliminates noise in audio applications. The buck  
conversion allows this device to directly step down high  
voltage batteries at the highest possible efficiency. The  
RT8238A is intended for CPU core, chipset, DRAM, or  
other low voltage supplies as low as 0.5V. The RT8238A  
is available in a WQFN-12L 2x2 package.  
z Over/Under Voltage Protection  
z Thermal Shutdown  
z Power Good Indicator  
z RoHS Compliant and Halogen Free  
Applications  
z Notebook Computers  
z CPU Core Supply  
z Chipset/RAM Supply as Low as 0.5V  
z GenericDC/DC Power Regulator  
Pin Configurations  
(TOP VIEW)  
Ordering Information  
12 11 10  
RT8238A  
1
9
LGATE  
PGOOD  
Package Type  
QW : WQFN-12L 2x2 (W-Type)  
GND  
2
3
8
7
PHASE  
UGATE  
EN  
13  
MODE  
Lead Plating System  
4
5
6
G : Green (Halogen Free and Pb Free)  
Z : ECO (Ecological Element with  
Halogen Free and Pb free)  
WQFN-12L 2x2  
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.  
Copyright 2014 Richtek Technology Corporation. All rights reserved.  
©
is a registered trademark of Richtek Technology Corporation.  
DS8238A-07 January 2014  
www.richtek.com  
1

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