®
RT6543A/B
High Efficiency Single Synchronous Buck PWM Controller
for INTEL VCCIN AUX ICL and TGL
General Description
The RT6543A/B PWM controller provides high efficiency,
excellent transient response, and high DC output accuracy
for stepping down high voltage batteries to generate low
voltage CPU core, I/O, and chipset RAM.
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.
Features
A High Efficiency Step-Down DC-DC Controller
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
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)
VSYS
EN
VID0
VID1
VCC
20 19 18 17 16
Applications
Notebook Computers
CPU/GPU Core Supply
Chipset/RAM Supply
Generic DC-DC Power Regulator
CS_DIS
ISENSEP
ISENSEN
PGOOD
COMP
1
2
3
4
5
6
7
8
9 10
15
14
AGND
21
13
12
11
PVCC
PGND
LGATE
PH
UGATE
WQFN-20L 3x3
Simplified Application Circuit
RT6543A/B
VSYS
PVCC
VCC
VSYS
PVCC
VCC
PGOOD
FSWSEL
EN
CS_DIS
VID0
VID1
PGND
AGND
BOOT
LGATE
PH
UGATE
ISENSEP
ISENSEN
VOUT
FB
COMP
RGND
BUCK
V
OUT
VEN
VID0
VID1
Copyright
©
2020 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS6543A/B-01 March 2020
FB
RGND
VOUT
FSWSEL
BOOT
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1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
