RT4805
Ordering Information
Pin Configuration
(TOP VIEW)
RT4805
Package Type
WSC : WL-CSP-16B 1.67x1.67 (BSC)
A1
A2
A3
A4
EN PGOOD VIN VIN
B1
B2
B3
VOUT
C3
B4
VOUT
C4
Note :
VSEL SCL
Richtek products are :
C1
C2
nBYP SDA
LX
LX
RoHS compliant and compatible with the current
D1
D2
D3
D4
requirements of IPC/JEDEC J-STD-020.
AGND PGND PGND PGND
Suitable for use in SnPb or Pb-free soldering processes.
Marking Information
3X : Product Code
WL-CSP-16B 1.67x1.67 (BSC)
W : Date Code
3XW
Functional Pin Description
Pin No.
Pin Name
Pin Function
A1
EN
Enable. When this pin is HIGH, the circuit is enabled.
Power good. It is a open-drain output. PGOOD pin pulls low automatically if
the overload or OTP event occurs.
A2
A3, A4
B1
PGOOD
VIN
Input voltage. Connect to Li-Ion battery input power source.
Output voltage select. When boost is running, this pin can be used to select
output voltage
VSEL
Serial interface clock. (Pull down if I2C is non-used).
B2
SCL
B3, B4
VOUT
Output voltage. Place COUT as close as possible to the device.
Bypass. This pin can be used to activate Forced Bypass Mode. When this
pin is LOW, the bypass switches are turned on and the IC is otherwise
inactive.
C1
nBYP
C2
SDA
LX
Serial interface date line. (Pull down if I2C is non-used).
C3, C4
Switching node. Connect to inductor.
Analog ground. This is the signal ground reference for the IC. All voltage
levels are measured with respect to this pin.
D1
AGND
PGND
Power ground. This is the power return for the IC. The COUT bypass
capacitor should be returned with the shortest path possible to these pins.
D2, D3, D4
Copyright © 2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS4805-03 April 2017
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
