PWM Controller. RT6543B Datasheet


RT6543B Controller. Datasheet pdf. Equivalent


Part Number

RT6543B

Description

High Efficiency Single Synchronous Buck PWM Controller

Manufacture

Richtek

Total Page 21 Pages
Datasheet
Download RT6543B Datasheet


RT6543B
®
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)
Applications
Notebook Computers
CPU/GPU Core Supply
Chipset/RAM Supply
Generic DC-DC Power Regulator
CS_DIS
ISENSEP
ISENSEN
PGOOD
COMP
20 19 18 17 16
1 15 PVCC
2 14 PGND
3 AGND 13 LGATE
4 21 12 PH
5 11 UGATE
6 7 8 9 10
Simplified Application Circuit
WQFN-20L 3x3
VSYS
PVCC
VCC
VEN
VID0
VID1
RT6543A/B
VSYS
PVCC
BOOT
LGATE
VCC
PGOOD
FSWSEL
EN
CS_DIS
VID0
PH
UGATE
ISENSEP
ISENSEN
VOUT
FB
VID1
PGND
AGND
COMP
RGND
Copyright ©2020 Richtek Technology Corporation. All rights reserved.
DS6543A/B-01 March 2020
BUCK
VOUT
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT6543B
RT6543A/B
Ordering Information
RT6543A/B
Package Type
QW : WQFN-20L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Marking Information
RT6543AGQW
ML= : Product Code
ML=YM
DNN
YMDNN : Date Code
Mode when VID changes to lower set point
A : Slew down
B : Decay down
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.
RT6543BGQW
P7=YM
DNN
P7= : Product Code
YMDNN : Date Code
Functional Pin Description
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
Pin Name
CS_DIS
ISENSEP
ISENSEN
PGOOD
COMP
FB
RGND
VOUT
FSWSEL
BOOT
UGATE
PH
Pin Function
Current limit setting. Connect a resistor from CS pin to AGND for overcurrent
protection. CS pin sources a CS current which is 6A (typ) at TA = 25oC to
define maximum allowable output current. CS terminal voltage VCS is
limited from 0.5V to 2.8V over all operation temperature.
Positive input pin for current sense of buck.(for load line setting, in zero load
line condition is short this pin with ISENSEN)
Negative input pin for current sense of buck.(for load line setting, in zero
load line condition is short this pin with ISENSEP)
Power good indicator output for VCCIN_AUX. This open-drain is pulled low
as UVP, OVP, OTP, EN low and output voltage is not regulated (such as
before soft-start). An external pull-up resistor to VCC or other external rail is
required, in which the pull-up resistor is recommended from 10kto 100k.
Internal error amplifier output. For loop compensator application.
Internal error amplifier input. For loop compensator application.
Return ground for VCCIN_AUX from CPU side.
VCCIN_AUX feedback input. This pin is unit feedback for AUX regulation
VCCIN_AUX setting pin. Use this pin to adjust AUX rail frequency setting for
different LC combination. (High state: Direct pull high to VCC, Hi-Z state:
Floating, Low state: Direct connect to GND). Default switching frequency is
floating, 600KHz. Anytime, make sure FSWSEL VCC < 0.5V.
Supply bootstrap capacitor output pin. The bootstrap capacitor is charged by
this pin while the low-side MOSFET is turned on. Therefore, the bootstrap
capacitor can provide the energy to turn on the high-side MOSFET. Connect
this pin through the bootstrap capacitor to the PH pin.
Upper gate driver with sink and source output. Connect to the gate of the
high-side MOSFET through a short and low inductance path.
Switch node of AUX. Connect to the power inductor. For the high-side gate
driver return path, connect a capacitor from PH to BOOT. Beside, this pin is
noisy, keep the sensitive trace or signal away from PH.
Copyright ©2020 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS6543A/B-01 March 2020


Features ® RT6543A/B High Efficiency Single Syn chronous Buck PWM Controller for INTEL VCCIN AUX ICL and TGL General Descript ion The RT6543A/B PWM controller provid es high efficiency, excellent transient response, and high DC output accuracy for stepping down high voltage batterie s to generate low voltage CPU core, I/O , and chipset RAM. The RT6543A/B suppor ts on chip voltage programming function between 0V and 1.8V by controlling VID 1/VID0 inputs. Compared with convention al current-mode PWMs, the RT6543A/B ach ieves high efficiency without any curre nt sensing resistors. Furthermore, the RT6543A/B has ability to drive synchron ous rectifier MOSFETs and enters diode emulation mode at light load condition that also save lots of power consumptio n. Besides, the RT6543A/B equips with U VLO, OVP, UVP, OTP and current limit pr otection. All above functions are integ rated in a WQFN-20L-3x3 package. Featu res  A High Efficiency Step-Down DC- DC Controller  Built-in 1% Reference Voltage  2-Bit Programmable.
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