RT6545A/B
Applications
Marking Information
RT6545AGQW
Notebook and Sub-Notebook Computers
C0= : Product Code
System Power Supplies
YMDNN : Date Code
C0=YM
2-Cell to 4-Cell Li+ Battery-PoweredDevices
DNN
Ordering Information
RT6545A/B
RT6545BGQW
Pin 1 Orientation***
(2) : Quadrant 2, Follow EIA-481-D
BZ= : Product Code
YMDNN : Date Code
BZ=YM
Package Type
DNN
QW : WQFN-20L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Pin Configurations
Pin Function With
A : LDO3 Always On
B : LDO3/LDO5 Always On
(TOP VIEW)
Note :
20 19 18 17 16
1
2
3
4
5
15
14
13
12
11
***Empty means Pin1 orientation is Quadrant 1
Richtek products are :
CS1
FB1
LDO3
FB2
LGATE1
BYP1
LDO5
VIN
LGATE2
GND
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
21
CS2
6
7
8
9 10
Suitable for use in SnPb or Pb-free soldering processes.
WQFN-20L 3x3
Functional Pin Description
Pin No.
Pin Name
Pin Function
Current Limit Setting. Connect a resistor to GND to set the threshold for Channel 1
synchronous RDS(ON) sense. The GND PHASE1 current limit threshold is 1/8th
the voltage seen at CS1 over a 0.2V to 2V range. There is an internal 50A
current source from LDO5 to CS1.
1
CS1
Feedback Voltage Input for Channel 1. Connect FB1 to a resistive voltage divider
from VOUT1 to GND to adjust output from 2V to 5.5V.
2
3
4
FB1
3.3V Linear Regulator Output. It is always on when VIN is higher than VINPOR
threshold.
LDO3
FB2
Feedback Voltage Input for Channel 2. Connect FB2 to a resistive voltage divider
from VOUT2 to GND to adjust output from 2V to 4V.
Current Limit Setting. Connect a resistor to GND to set the threshold for Channel 2
synchronous RDS(ON) sense. The GND PHASE2 current limit threshold is 1/8th
the voltage seen at CS2 over a 0.2V to 2V range. There is an internal 50A
current source from LDO5 to CS2.
5
CS2
6
7
EN2
Enable Control Input for Channel 2.
PGOOD
Power Good Indicator Output for Channel 2.
Copyright 2016 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS6545A/B-00 May 2016
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
