RT6541A PWM Controller Datasheet

RT6541A Datasheet, PDF, Equivalent


Part Number

RT6541A

Description

High Efficiency Single Synchronous Buck PWM Controller

Manufacture

Richtek

Total Page 17 Pages
Datasheet
Download RT6541A Datasheet


RT6541A
®
RT6541A
High Efficiency Single Synchronous Buck PWM Controller
General Description
The RT6541A PWM controller provides high efficiency,
excellent transient response, and high DC output accuracy
needed for stepping down high voltage batteries to
generate low voltage CPU core, I/O, and chipset RAM
supplies in notebook computers.
The RT6541A supports on chip voltage programming
function between 0.8V and 1.05V by controlling GX digital
inputs.
The constant-on-time PWM control scheme handles wide
input/output voltage ratios with ease and provides 100ns
instant-onresponse to load transients while maintaining
a relatively constant switching frequency.
The RT6541A 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 and enter diode emulation mode at
light load condition. The buck conversion allows this device
to directly step down high voltage batteries at the highest
possible efficiency. The RT6541A is intended for CPU core,
chipset, DRAM, or other low voltage supplies as low as
0.8V.
The RT6541A is available in a WDFN-14L 3x2 package.
Features
Intel SKL VR support
Built-in 1% Reference Voltage
2-Bit Programmable Output Voltage with Integrated
Transition Support
Support Intel LPM (Low-Power Mode) Feature
4700ppm/°C Programmable Current Limit by Low-
Side RDS(ON) Sensing
3V to 26V Battery Input Range
Internal Voltage Ramp Soft-Start Control
Drives Large Synchronous Rectifier FETs
Integrated Boost Switch
Over/Under-Voltage Protection
Thermal Shutdown
Power Good Indicator
RoHS Compliant and Halogen Free
Tiny 14-Lead WDFN Package
Applications
Notebook Computers
CPU/GPU Core Supply
Chipset/RAM Supply
Generic DC-DC Power Regulator
Simplified Application Circuit
VIN
RT6541A
VCC
VCC
CBYPASS
UGATE
BOOT
R2
PGOOD
PHASE
EN LGATE
RCS
CS
LPM
GND
MODE
RGND
FB
G0
G1
Copyright ©2019 Richtek Technology Corporation. All rights reserved.
DS6541A-02 September 2019
Q1
R4
R3
C1
Q2
CIN
LOUT
R5*
C2*
COUT
VOUT
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT6541A
RT6541A
Ordering Information
RT6541A
Package Type
QW : WDFN-14L 3x2 (W-Type)
(Exposed Pad-Option 1)
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.
Pin Configuration
(TOP VIEW)
MODE 1
PGOOD 2
EN 3
LPM 4
BOOT 5
UGATE 6
PHASE 7
GND
15
14 CS
13 FB
12 RGND
11 G1
10 G0
9 VCC
8 LGATE
WDFN-14L 3x2
Marking Information
0TW
0T : Product Code
W : Date Code
Functional Pin Description
Pin No.
Pin Name
Pin Function
1
MODE
VCCIO/PCH_Core/EDRAM select pin.
2
PGOOD
Open drain power good indicator. High impedance indicates power is good.
3 EN
PWM enable control input. Do not leave this pin floating.
4
LPM
Low power mode control pin.
5
BOOT
BOOT bootstrap supply for high-side gate driver.
6
UGATE
High-side gate driver output.
7
PHASE
Switch node. External inductor connection for VDDQ and behave as the
current sense comparator input for Low-Side MOSFET RDS(ON) sensing.
8
LGATE
Low-side gate driver output.
9
VCC
Supply voltage input for the analog supply and LGATE gate driver.
10 G0
2-bit input pin.
11 G1
2-bit input pin.
12
RGND
Remote voltage sense ground pin.
13 FB
14 CS
15 (Exposed Pad) GND
Output voltage feedback input. Connect VOUT to converter output node.
Current limit threshold setting input. Connect a setting resistor to GND and
the current limit threshold is equal to 1/10 of the voltage at this pin.
Ground. The Exposed Pad must be soldered to a large PCB and connected
to GND for maximum power dissipation.
Copyright ©2019 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS6541A-02 September 2019


Features ® RT6541A High Efficiency Single Synch ronous Buck PWM Controller General Des cription The RT6541A PWM controller pro vides high efficiency, excellent transi ent response, and high DC output accura cy needed for stepping down high voltag e batteries to generate low voltage CPU core, I/O, and chipset RAM supplies in notebook computers. The RT6541A suppor ts on chip voltage programming function between 0.8V and 1.05V by controlling GX digital inputs. The constant-on-time PWM control scheme handles wide input/ output voltage ratios with ease and pro vides 100ns “instant-on” response t o load transients while maintaining a r elatively constant switching frequency. The RT6541A achieves high efficiency a t a reduced cost by eliminating the cur rent-sense resistor found in traditiona l current-mode PWMs. Efficiency is furt her enhanced by its ability to drive ve ry large synchronous rectifier MOSFETs and enter diode emulation mode at light load condition. The buck conversion allows this device to directly .
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