®
RT6543A/B
High Efficiency Single Synchronous Buck PWM Controller
for INTEL VCCIN AUX ICL and TGL
General Description
Features
A High Efficiency Step-Down DC-DC Controller
The RT6543A/B PWM controller provides high efficiency,
excellent transient response, and highDC output accuracy
for stepping down high voltage batteries to generate low
voltage CPU core, I/O, and chipset RAM.
Built-in 1% Reference Voltage
2-Bit Programmable Output Voltage with Integrated
Adjustable Switching Frequency
Input Voltage Range : 3V to 24V
Internal Soft-Start to Reduce Inrush Current
Capability of Driving Large Synchronous Rectifier
MOSFETs
The RT6543A/B supports on chip voltage programming
function between 0V and 1.8V by controlling VID1/VID0
inputs.
Compared with conventional current-mode PWMs, the
RT6543A/B achieves high efficiency without any current
sensing resistors. Furthermore, the RT6543A/B has ability
to drive synchronous rectifier MOSFETs and enters diode
emulation mode at light load condition that also save lots
of power consumption. Besides, the RT6543A/B equips
with UVLO, OVP, UVP, OTP and current limit protection.
All above functions are integrated in a WQFN-20L-3x3
package.
Power Good Indicator
Cycle-by-Cycle Current Limit
Over-/Under-Voltage Protection
Thermal Shutdown
RT6543A : Slew Down Mode as VID Change
RT6543B : Decay Down Mode as VID Change
Pin Configuration
(TOP VIEW)
Applications
20 19 18 17 16
Notebook Computers
1
2
3
4
5
15
14
13
12
11
CS_DIS
ISENSEP
ISENSEN
PGOOD
COMP
PVCC
PGND
LGATE
PH
CPU/GPU Core Supply
Chipset/RAM Supply
AGND
21
UGATE
GenericDC-DC Power Regulator
6
7
8
9 10
WQFN-20L 3x3
Simplified Application Circuit
RT6543A/B
BOOT
VSYS
PVCC
VSYS
PVCC
V
OUT
BUCK
LGATE
VCC
VCC
PH
UGATE
PGOOD
ISENSEP
ISENSEN
FSWSEL
EN
VEN
CS_DIS
VID0
VOUT
FB
VID0
VID1
VID1
PGND
AGND
COMP
RGND
Copyright 2020 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
DS6543A/B-01 March 2020
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
