RT4805A
Ordering Information
RT4805A
Package Type
WSC : WL-CSP-16B 1.67x1.67 (BSC)
Note :
Richtek products are :
A1
Pin Configuration
(TOP VIEW)
A2
A3
A4
EN PGOOD VIN
B1
B2
B3
VIN
B4
VSEL
C1
SCL VOUT VOUT
C2
C3
C4
RoHS compliant and compatible with the current
requirements of IPC/JEDEC J-STD-020.
nBYP SDA
D1
D2
LX
D3
LX
D4
AGND PGND PGND PGND
Suitable for use in SnPb or Pb-free soldering processes.
WL-CSP-16B 1.67x1.67 (BSC)
Marking Information
4D : Product Code
W : Date Code
4DW
Functional Pin Description
Pin No.
A1
A2
A3, A4
B1
B2
B3, B4
C1
C2
C3, C4
D1
D2, D3, D4
Pin Name
EN
PGOOD
VIN
VSEL
SCL
VOUT
nBYP
SDA
LX
AGND
PGND
Pin Function
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.
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
Serial interface clock. (Pull down if I
2
C is non-used).
Output voltage. Place C
OUT
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.
Serial interface Date Line. (Pull down if I
2
C is non-used).
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.
Power ground. This is the power return for the IC. The C
OUT
bypass
capacitor should be returned with the shortest path possible to these pins.
Copyright © 2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS4805A-02
April 2017
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
