RT9011
Portable Power Management 300mA Dual LDO Regulator
General Description
The RT9011 is a dual channel, low noise, and low dropout
regulator sourcing up to 300mA at each channel. The range
of output voltage is from 1.2V to 3.6V by operating from
2.5V to 5.5V input.
The RT9011 offers 2% accuracy, extremely low dropout
voltage (240mV @ 300mA), and extremely low ground
current, only 27μA per LDO. The shutdown current is near
zero current which is suitable for battery-power devices.
Other features include current limiting, over temperature,
output short circuit protection.
The RT9011 is short circuit thermal folded back protected.
The IC lowers its OTP trip point from 165°C to 110°C when
output short circuit occurs (VOUT < 0.4V) providing
maximum safety to end users.
The RT9011 can operate stably with very small ceramic
output capacitors, reducing required board space and
component cost. The RT9011 is available in fixed output
voltages in the TSOT-23-6, WDFN-8L 2x2, WDFN-10L 3x3,
WDFN-8L 3x3 and WDFN-6L 1.6x1.6 packages.
Features
Wide Operating Voltage Ranges : 2.5V 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 27μA/LDO
μ
High Output Accuracy 2%
Short Circuit Protection
Thermal Shutdown Protection
Current Limit Protection
Short Circuit Thermal Folded Back Protection
Tiny TSOT-23-6 and 6-Lead/8-Lead/10-Lead WDFN
Packages
RoHS Compliant and 100% Lead (Pb)-Free
Applications
CDMA/GSM Cellular Handsets
Battery-Powered Equipment
Laptop, Palmtops, Notebook Computers
Hand-Held Instruments
PCMCIA Cards
Portable Information Appliances
Ordering Information
RT9011-
Package Type
J6 : TSOT-23-6
QW : WDFN-8L 2x2 (W-Type)
QWA : WDFN-10L 3x3 (W-Type)
QWB : WDFN-8L 3x3 (W-Type)
QWC : WDFN-6L 1.6x1.6 (W-Type)
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Output Voltage : VOUT1/VOUT2
VOUT2 > VOUT1 is Recommended
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
Voltage
3.5
1.85
1.8
2.6
2.85
3.2
2.9
1.9
Code
B
E
H
L
P
S
W
Voltage
1.3
2.1
2
2.7
3
3.3
1.6
Code
C
F
J
M
Q
T
X
Voltage
1.2
1.5
2.5
2.8
3.1
2.65
3.15
Note :
Richtek products are :
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.
DS9011-08 April 2011
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1
RT9011
Pin Configurations
(TOP VIEW)
VOUT1 VIN EN1
6
5
2
4
3
VOUT2 GND EN2
TSOT-23-6
WDFN-8L 2x2
WDFN-10L 3x3
Typical Application Circuit
V
IN
VIN
C
IN
1uF
EN1
VOUT2
EN2
GND
C
OUT2
1uF
V
OUT2
VOUT1
RT9011
Chip Enable
C
OUT1
1uF
V
OUT1
Functional Pin Description
Pin No.
TSOT-23-6
5
4
3
2
1
6
--
WDFN-8L WDFN-10L WDFN-8L WDFN-6L Pin Name
2x2
3x3
3x3
1.6x1.6
1
2
3
5,
Exposed
Pad (9)
7
8
4, 6
1
2
3
6,
Exposed
Pad (11)
9
10
4, 5, 7, 8
1
2
3
6,
Exposed
Pad (9)
5
8
4, 7
1
2
3
4,
Exposed GND
Pad (7)
5
6
--
VOUT2
VOUT1
NC
VIN
EN1
EN2
Supply Input.
Chip Enable1 (Active High).
Chip Enable2 (Active High).
Common Ground. The exposed pad must be
soldered to a large PCB and connected to
GND for maximum power dissipation.
Channel 2 Output Voltage.
Channel 1 Output Voltage.
No Internal Connection.
Pin Function
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2
9
VIN
EN1
EN2
NC
1
2
3
4
GND
9
8
7
VOUT1
VOUT2
6
NC
5
GND
VIN
EN1
EN2
NC
NC
1
2
3
4
5
GND
11
10
9
8
7
VOUT1
VOUT2
NC
NC
GND
VIN
EN1
EN2
NC
1
2
3
4
GND
9
8
7
6
5
VOUT1
NC
GND
VOUT2
VIN
EN1
EN2
1
2
3
GND
7
6
5
4
VOUT1
VOUT2
GND
WDFN-8L 3x3
WDFN-6L 1.6x1.6
DS9011-08 April 2011
RT9011
Function Block Diagram
EN1
0.2uA
Shutdown
and
Logic Control
V
REF
VIN
-
+
MOS Driver
VOUT1
Current-Limit
and
Thermal
Protection
GND
Error
Amplifier
EN2
0.2uA
Shutdown
and
Logic Control
V
REF
-
+
MOS Driver
VOUT2
Current-Limit
and
Thermal
Protection
GND
Error
Amplifier
DS9011-08 April 2011
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3
RT9011
Absolute Maximum Ratings
(Note 1)
Supply Input Voltage ------------------------------------------------------------------------------------------------------
Other I/O Pin Voltages ---------------------------------------------------------------------------------------------------
Power Dissipation, P
D
@ T
A
= 25°C
TSOT-23-6 -------------------------------------------------------------------------------------------------------------------
WDFN-8L 2x2 --------------------------------------------------------------------------------------------------------------
WDFN-10L 3x3 -------------------------------------------------------------------------------------------------------------
WDFN-8L 3x3 --------------------------------------------------------------------------------------------------------------
−
0.3V to 7V
−
0.3V to 7V
0.455W
0.606W
0.926W
0.926W
WDFN-6L 1.6x1.6 --------------------------------------------------------------------------------------------------------- 0.571W
Package Thermal Resistance (Note 2)
TSOT-23-6,
θ
JA
------------------------------------------------------------------------------------------------------------- 220°C/W
WDFN-8L 2x2,
θ
JA
--------------------------------------------------------------------------------------------------------- 165°C/W
WDFN-10L 3x3,
θ
JA
------------------------------------------------------------------------------------------------------- 108°C/W
WDFN-8L 3x3,
θ
JA
--------------------------------------------------------------------------------------------------------- 108°C/W
WDFN-6L 1.6x1.6,
θ
JA
---------------------------------------------------------------------------------------------------- 175°C/W
Junction Temperature ----------------------------------------------------------------------------------------------------- 150°C
Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- 260°C
Storage Temperature Range --------------------------------------------------------------------------------------------
−65°C
to 150°C
ESD Susceptibility (Note 3)
HBM (Human Body Mode) ---------------------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ------------------------------------------------------------------------------------------------------ 200V
Recommended Operating Conditions
(Note 4)
2.5V to 5.5V
0V to 5.5V
−
40°C to 125°C
−
40°C to 85°C
Supply Input Voltage ------------------------------------------------------------------------------------------------------
Enable Input Voltage ------------------------------------------------------------------------------------------------------
Junction Temperature Range --------------------------------------------------------------------------------------------
Ambient Temperature Range --------------------------------------------------------------------------------------------
Electrical Characteristics
(V
IN
= V
OUT
+ 1V, V
EN
= V
IN
, C
IN
= C
OUT
= 1μF, T
A
=
−40°C
to 85°C, unless otherwise specified.)
Parameter
Input Voltage
Dropout Voltage
(Note 5)
Symbol
Test Conditions
V
IN
= 2.5V to 5.5V
Min
2.5
--
1.2
−3
--
--
330
--
--
1.5
--
Typ
--
240
--
--
--
--
450
58
--
--
--
Max
5.5
330
3.6
+3
0.2
0.6
700
80
1
--
0.4
Unit
V
mV
V
%
%/V
%
mA
μA
μA
V
V
DROP
V
OUT
ΔV
ΔV
LINE
I
OUT
= 300mA
I
OUT
= 1mA to 300mA
V
IN
= (V
OUT
+ 0.3V) to 5.5V or
V
IN
> 2.5V, whichever is larger
R
LOAD
= 1Ω
Output voltage range
V
OUT
Accuracy
Line Regulation
Load Regulation
Current Limit
Quiescent Current
Shutdown Current
EN Threshold
ΔV
LOAD
1mA < I
OUT
< 300mA
I
Q
I
Q_SD
V
IH
V
IL
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
To be continued
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4
DS9011-08 April 2011
RT9011
Parameter
Output Voltage TC
V
OUT
Discharge Resistance in
Shutdown
(Note 6)
EN Pull Low Current
Thermal Shutdown
Thermal Shutdown Hysteresis
I
EN
T
SD
ΔT
SD
f = 100Hz
f = 1kHz
PSRR
V
IN
= V
OUT
+ 1V, C
OUT
= 2.2μF
I
LOAD
= 50mA
PSRR
f = 10kHz
f = 100kHz
f = 200kHz
f = 300kHz
Output Voltage Noise
C
OUT1
= C
OUT2
= 10uF, 10Hz to
100kHz, I
OUT1
= I
OUT2
= 1mA
V
IN
= 5V, EN1 = EN2 = GND
Symbol
Test Conditions
Min
--
--
--
--
--
--
--
--
--
--
--
--
Typ
100
3
0.2
170
40
70
70
70
54
45
38
100
Max
--
--
--
--
--
--
--
--
--
--
--
--
uVrms
dB
Unit
ppm/°C
kΩ
μA
°C
°C
Note 1.
Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for
stress ratings. 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 for extended
periods may remain possibility to affect device reliability.
Note 2.
θ
JA
is measured in the natural convection at T
A
= 25°C on a low effective single layer thermal conductivity test board of
JEDEC 51-3 thermal measurement standard.
Note 3.
Devices are ESD sensitive. Handling precaution 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.
DS9011-08 April 2011
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