®
RT9055
300mA Dual LDO Regulator
General Description
The RT9055 is a dual channel, low noise, and low dropout
regulator sourcing up to 300mA at each channel. The output
voltage range is from 0.9V to 3.5V with an input voltage
range from 1.5V to 5.5V.
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.
The RT9055 allows stable operation with very small
ceramic output capacitors, hence minimizing required
board space and component cost.
The RT9055 is available in a WL-CSP-6B 0.8x1.2 package.
Features
Wide Operating Voltage Range : 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
Dual LDO Outputs (300mA/300mA)
Ultra-Low Quiescent Current : 29μA/LDO
μ
High Output Accuracy 2%
Short Current Protection
Thermal Shutdown Protection
Current Limit Protection
Short Circuit Thermal Folded Back Protection
RoHS Compliant and Halogen Free
Applications
Ordering Information
RT9055-
Package Type
WSC : WL-CSP-6B 0.8x1.2
Output Voltage : VOUT1/VOUT2
VOUT2 > VOUT1 is Recommended
Note :
Richtek products are :
½
Cellular Handsets
Battery Powered Equipment
Hand-Held Instruments
Portable Information Appliances
Pin Configurations
(TOP VIEW)
EN1
A1
A2
B2
C2
VOUT1
VIN
VOUT2
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.
GND
EN2
B1
C1
½
WSC-CSP-6B 0.8x1.2
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Available Voltage Version
Code
A
D
G
K
N
R
V
Y
2
Voltage Code Voltage
3.5
1.85
1.8
2.6
2.85
3.2
2.9
1.9
1.1
B
E
H
L
P
S
W
U
3
1.3
2.1
2
2.7
3
3.3
1.6
1.4
1
Code Voltage
C
F
J
M
Q
T
X
Z
1.2
1.5
2.5
2.8
3.1
2.65
3.15
1.25
Copyright
©
2014 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9055-02 August 2014
www.richtek.com
1
RT9055
Typical Application Circuit
V
IN
B2
C
IN
1µF
A1
Chip Enable
C1
VIN
VOUT1
RT9055
EN1
EN2
GND
B1
VOUT2
C2
C
OUT2
1µF
A2
C
OUT1
1µF
V
OUT1
V
OUT2
Functional Pin Description
Pin No.
A1
A2
B1
B2
C1
C2
Pin Name
EN1
VOUT1
GND
VIN
EN2
VOUT2
LDO1 Enable (Active High).
LDO1 Output Voltage.
Ground.
Supply Input.
LDO2 Enable (Active High).
LDO2 Output Voltage.
Pin Function
Function Block Diagram
EN1
13µA
V
REF
-
Shutdown
and
Logic Control
Output
Driver
VOUT1
Current Limit
and
Thermal Protection
VIN
+
EN2
13µA
V
REF
-
Shutdown
and
Logic Control
Output
Driver
VOUT2
Current Limit
and
Thermal Protection
+
GND
Copyright
©
2014 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS9055-02 August 2014
RT9055
Absolute Maximum Ratings
(Note 1)
−0.3V
to 6V
−0.3V
to 6V
0.670W
148°C/W
260°C
Supply Input Voltage, VIN -----------------------------------------------------------------------------------------------
Other I/O Pins Voltages -------------------------------------------------------------------------------------------------
Power Dissipation, P
D
@ T
A
= 25°C
WL-CSP-6B 0.8x1.2 ------------------------------------------------------------------------------------------------------
Package Thermal Resistance (Note 2)
WL-CSP-6B 0.8x1.2,
θ
JA
------------------------------------------------------------------------------------------------
Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------------------
Junction Temperature ----------------------------------------------------------------------------------------------------- 150°C
Storage Temperature Range --------------------------------------------------------------------------------------------
−65°C
to 150°C
ESD Susceptibility (Note 3)
HBM (Human Body Model) ---------------------------------------------------------------------------------------------- 2kV
MM (Machine Model) ----------------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions
(Note 4)
Supply Input Voltage,
VIN ----------------------------------------------------------------------------------------------- 1.5V to 5.5V
Junction Temperature Range --------------------------------------------------------------------------------------------
−40°C
to 125°C
Ambient Temperature Range --------------------------------------------------------------------------------------------
−40°C
to 85°C
Electrical Characteristics
(V
IN
= V
OUT
+ 1V, C
IN
= C
OUT
= 1μF, T
A
=
−40°C
to 85°C, unless otherwise specified)
Parameter
Input Power Supply
Symbol
Test Conditions
V
OUT
= 1.2V to 1.4V, I
OUT
= 300mA
Min
50
40
20
0.9
2
2
1.5
350
--
--
1.2
--
--
8
--
--
Typ
--
--
--
--
--
--
--
600
58
--
--
--
3
13
170
40
Max
550
400
300
3.5
2
2
1.5
--
--
1
--
0.4
--
18
--
--
Unit
Dropout Voltage
(Note 5)
V
DROP
V
OUT
V
V
LINE
V
LOAD
I
LIM
I
Q
I
SHDN
V
IH
V
IL
V
OUT
= 1.5V to 2.4V, I
OUT
= 300mA
V
OUT
= 2.5V to 3.5V, I
OUT
= 300mA
mV
V
%
%
%
mA
A
A
V
k
A
°C
°C
Output Voltage Range
V
OUT
Accuracy
Line Regulation
Load Regulation
Current Limit
Quiescent Current
Shutdown Current
EN Input
Logic-High
Threshold
Logic-Low
Voltage
V
OUT
Discharge Resistance
in Shutdown
(Note 6)
EN Pull Low Current
Thermal Shutdown
Thermal Shutdown
Hysteresis
I
OUT
= 1mA to 300mA
V
IN
= (V
OUT
+ 1) to 5.5V, I
OUT
= 1mA
1mA < I
OUT
< 300mA
R
LOAD
= 0
V
EN
> 1.5V
V
EN
< 0.4V
V
IN
= 2.5V to 5.5V, Power On
V
IN
= 2.5V to 5.5V, Shutdown
V
IN
= 5V, EN1 = EN2 = GND
I
EN
T
SD
T
SD
Copyright
©
2014 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9055-02 August 2014
www.richtek.com
3
RT9055
Parameter
Symbol
Test Conditions
f = 100Hz, V
IN
= V
OUT
+ 1V,
C
OUT
= 2.2F, I
LOAD
= 50mA
f = 1kHz, V
IN
= V
OUT
+ 1V,
C
OUT
= 2.2F, I
LOAD
= 50mA
f = 10kHz, V
IN
= V
OUT
+ 1V,
C
OUT
= 2.2F, I
LOAD
= 50mA
f = 100kHz, V
IN
=V
OUT
+ 1V,
C
OUT
= 2.2F, I
LOAD
= 50mA
f = 200kHz, V
IN
= V
OUT
+ 1V,
C
OUT
= 2.2F, I
LOAD
= 50mA
f = 300kHz, V
IN
= V
OUT
+ 1V,
C
OUT
= 2.2F, I
LOAD
= 50mA
Output Voltage Noise
C
OUT1
= C
OUT2
= 10F, 10Hz
to100kHz, I
OUT1
= I
OUT2
= 1mA
Min
--
--
--
--
--
--
--
Typ
70
70
70
54
45
38
100
Max
--
--
--
dB
--
--
--
--
V
RMS
Unit
Power Supply Rejection
Ratio
PSRR
Note 1.
Stresses beyond those listed
“Absolute
Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in
the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may
affect device reliability.
Note 2.
θ
JA
is measured at T
A
= 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. The CSP
balls connect directly to the internal GND copper plane by 2 vias, the via diameter is about 1mm.
Note 3.
Devices are ESD sensitive. Handling precaution is recommended.
Note 4.
The device is not guaranteed to function outside its operating conditions.
Note 5.
The dropout voltage is defined as V
IN
−
V
OUT
, which is measured when V
OUT
is V
OUT(NORMAL)
−
100mV.
Note 6.
It is guaranteed by design.
Copyright
©
2014 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS9055-02 August 2014
RT9055
Typical Operating Characteristics
Output Voltage vs. Temperature
1.22
1.21
80
70
Quiescent Current vs. Temperature
Quiescent Current (µA)
V
IN
= 3.7V, No Load
-50
-25
0
25
50
75
100
125
1.20
Output Voltage (V)
1.19
1.18
1.17
1.16
1.15
1.14
1.13
1.12
60
50
40
30
20
10
0
-50
-25
0
25
50
75
100
125
V
IN
= 3.7V, No Load
Temperature (°C)
Temperature (°C)
Dropout Voltage vs. Load Current
140
120
Line Transient Response
Dropout Voltage (mV)
125°C
100
80
60
40
20
25°C
V
IN
(2V/Div)
−40°C
V
OUT
(20mV/Div)
V
OUT
= 3.3V
V
IN
= 2.8V to 4.2V, I
LOAD
= 1mA
0
0
50
100
150
200
250
300
Time (100μs/Div)
Load Current (mA)
Line Transient Response
Line Transient Response
V
IN
(2V/Div)
V
OUT
(20mV/Div)
V
IN
= 2.8V to 4.2V, I
LOAD
= 10mA
V
IN
(2V/Div)
V
OUT
(20mV/Div)
V
IN
= 2.8V to 4.2V, I
LOAD
= 100mA
Time (100μs/Div)
Time (100μs/Div)
Copyright
©
2014 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9055-02 August 2014
www.richtek.com
5
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