®
RT9055
300mA Dual LDO Regulator
General Description
Features
Wide Operating Voltage Range : 1.5V to 5.5V
The RT9055 is a dual channel, low noise, and low dropout
regulator sourcing up to 300mAat each channel. The output
voltage range is from 0.9V to 3.5V with an input voltage
range from 1.5V to 5.5V.
Low Noise for RF Application
No Noise Bypass Capacitor Required
Fast Response in Line/Load Transient
TTL Logic Controlled Shutdown Input
Low Temperature Coefficient
The RT9055 offers 2% accuracy, extremely low dropout
voltage and extremely low quiescent current (only 29μA
per LDO). The shutdown current is near zero which is
suitable for battery powered applications. The RT9055 also
provides protection functions such as current limiting,
output short circuit protection, and over temperature
protection.
Dual LDO Outputs (300mA/300mA)
Ultra-Low Quiescent Current : 29μA/LDO
High Output Accuracy 2%
Short Current Protection
Thermal Shutdown Protection
Current Limit Protection
The RT9055 allows stable operation with very small
ceramic output capacitors, hence minimizing required
board space and component cost.
Short Circuit Thermal Folded Back Protection
RoHS Compliant and Halogen Free
Applications
The RT9055 is available in a WL-CSP-6B 0.8x1.2 package.
Cellular Handsets
Ordering Information
Battery Powered Equipment
Hand-Held Instruments
Portable InformationAppliances
RT9055-
Package Type
WSC : WL-CSP-6B 0.8x1.2
Output Voltage : VOUT1/VOUT2
VOUT2 > VOUT1 is Recommended
Note :
Pin Configurations
(TOP VIEW)
A1
B1
A2
B2
EN1
GND
EN2
VOUT1
VIN
Richtek products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
C1 C2
VOUT2
Suitable for use in SnPb or Pb-free soldering processes.
WSC-CSP-6B 0.8x1.2
Marking Information
Available Voltage Version
Code Voltage Code Voltage Code Voltage
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
A
D
G
K
N
R
V
Y
2
3.5
1.85
1.8
B
E
H
L
1.3
2.1
2
C
F
1.2
1.5
J
2.5
2.6
2.7
3
M
Q
T
2.8
2.85
3.2
P
S
W
U
3
3.1
3.3
1.6
1.4
1
2.65
3.15
1.25
2.9
X
Z
1.9
1.1
Copyright 2014 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
DS9055-02 August 2014
www.richtek.com
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