PWM Controller. RT8132A Datasheet


RT8132A Controller. Datasheet pdf. Equivalent


Part Number

RT8132A

Description

High Efficiency Single Synchronous Buck PWM Controller

Manufacture

Richtek

Total Page 15 Pages
Datasheet
Download RT8132A Datasheet


RT8132A
®
RT8132A
High Efficiency Single Synchronous Buck PWM Controller
General Description
The RT8132A 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-onresponse to
load transients while maintaining a relatively constant
switching frequency.
The RT8132A 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 RT8132A provides an 1% high
accuracy 0.8V reference voltage with minimum 1mA
source/sink current for high accuracy output application.
Ordering Information
RT8132A
Package Type
QW : WDFN-10L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
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
Applications
Generic DC-DC Power Regulator
Mother Boards and Desktop Servers
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
LH=YM
DNN
LH= : Product code
YMDNN : Date code
Copyright ©2017 Richtek Technology Corporation. All rights reserved.
DS8132A-00 October 2017
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT8132A
RT8132A
Typical Application Circuit
VCC
Enable
5V
PGOOD
5 VCC
4.7µF
RT8132A
VIN
100k
7 EN
UGATE 2
BOOT 1
8 PGOOD PHASE 3
10
REFOUT
LGATE/ 4
OCSET
0.1µF
ROCSET
9 REFIN
FB 6
GND
11 (Exposed Pad)
VOUT
Functional Pin Description
Pin No.
1
2
3
4
5
6
7
8
9
10
11
(Exposed Pad)
Pin Name
BOOT
UGATE
PHASE
LGATE/OCSET
VCC
FB
EN
PGOOD
REFIN
REFOUT
GND
Pin Function
Bootstrap supply for sigh side gate driver. Connect a capacitor between this
pin and the PHASE pin.
Gate drive output for the external high side MOSFET.
Switch node. It behaves as the current sense comparator input for low side
MOSFET RDS(ON) sensing and reference voltage for on-time generation.
Gate drive output for the low side external MOSFET. Connect a resistor
(ROCSET) between this pin and GND to set the output current limit level. If
ROCSET is not present , or the setting threshold greater than 400mV, the OC
threshold is internally present to 315mV (typ.)
Supply voltage input. It provides the power for the Buck controller, the low
side driver and the bootstrap circuit for high side driver. Bypass to GND with
a 4.7F ceramic capacitor.
VOUT feedback voltage input. Connect the FB to a resistive voltage divider
from VOUT to GND to set the output voltage from 0.3V to 3.3V
Enable control input.
Open-drain power good indicator. High impedance indicates that power is
good.
Reference input. Connect a current console to REFIN pin, and connect a
resistor between REFIN and REFOUT to tune up/down FB reference
voltage.
Reference voltage output. It provides a 1% high accuracy reference 0.8V
with 2mA source/sink ability. Bypass to GND with a maximum 6.8nF ceramic
capacitor.
Ground. The exposed pad must be soldered to a large PCB and connected
to GND for maximum power dissipation.
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS8132A-00 October 2017


Features ® RT8132A High Efficiency Single Synch ronous Buck PWM Controller General Des cription The RT8132A PWM controller pro vides high efficiency, excellent transi ent response, and high DC output accura cy needed for CPU core, I/O, and chipse t RAM supplies in notebook computers. R ichtek Mach ResponseTM technology is sp ecifically designed for providing 100ns “instant-on” response to load tran sients while maintaining a relatively c onstant switching frequency. The RT8132 A achieves high efficiency at a reduced cost by eliminating the current sense resistor found in traditional current m ode PWMs. Efficiency is further enhance d by its ability to drive very large sy nchronous rectifier MOSFETs. The Buck c onversion allows this device to directl y step down high voltage batteries at t he highest possible efficiency. The RT8 132A provides an 1% high accuracy 0.8V reference voltage with minimum 1mA sour ce/sink current for high accuracy outpu t application. Ordering Information RT8132A Package Type QW : WDFN-1.
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