PWM Controller. RT8125F Datasheet


RT8125F Controller. Datasheet pdf. Equivalent


Part Number

RT8125F

Description

High Efficiency Single Synchronous Buck PWM Controller

Manufacture

Richtek

Total Page 16 Pages
Datasheet
Download RT8125F Datasheet


RT8125F
®
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-onresponse 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
61

RT8125F
RT8125F/G
Functional Pin Description
Pin No.
Pin Name
Pin Function
1 BOOT
Bootstrap supply for high side gate driver. Connect a capacitor between this
pin and the PHASE pin.
2 UGATE
Gate drive output for the external high side MOSFET.
3 PHASE
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
4
LGATE/OCSET
(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.)
5 VCC
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.
6 FB
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
7 EN
Enable control input.
8 PGOOD
Open-drain power good indicator. High impedance indicates that power is
good.
9 REFIN
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
10 REFOUT with 2mA source/sink ability. Bypass to GND with a maximum 6.8nF ceramic
capacitor.
11
(Exposed Pad)
GND
Ground. The exposed pad must be soldered to a large PCB and connected
to GND for maximum power dissipation.
Copyright ©2017 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS8125F/G-00 October 2017


Features ® RT8125F/G High Efficiency Single Syn chronous Buck PWM Controller General D escription The RT8125F/G PWM controller provides high efficiency, excellent tr ansient response, and high DC output ac curacy needed for CPU core, I/O, and ch ipset RAM supplies in notebook computer s. Richtek Mach ResponseTM technology i s specifically designed for providing 1 00ns “instant-on” response to load transients while maintaining a relative ly constant switching frequency. The RT 8125F/G achieves high efficiency at a r educed cost by eliminating the current sense resistor found in traditional cur rent mode PWMs. Efficiency is further e nhanced by its ability to drive very la rge synchronous rectifier MOSFETs. The Buck conversion allows this device to d irectly step down high voltage batterie s at the highest possible efficiency. T he RT8125F/G provides an 1% high accura cy 0.8V reference voltage with minimum 1mA source/sink current for high accura cy output application. Applications  Generic DC-DC Power Regulator .
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