®
RT9012
300mA Dual LDO Regulator with POR
General Description
RT9012 is a dual channel, low noise, and low dropout
with the sourcing ability up to 300mA and power-on reset
function. The range of output voltage is from 1.2V to 3.5V
by operating from 2.5V to 5.5V input.
The RT9012 offers 2% accuracy, extremely low dropout
voltage (240mV @
300mA), and extremely low ground
current, only 27uA 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 RT9012 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 RT9012 can operate stably with very small ceramic
output capacitors, reducing required board space and
component cost. The RT9012 is available in fixed output
voltages in the
WDFN-8L
2x2 package.
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 27uA/LDO
High Output Accuracy 2%
Short Circuit Protection
Thermal Shutdown Protection
Current Limit Protection
Short Circuit Thermal Folded Back Protection
Tiny 8-Lead WDFN Package
RoHS Compliant and 100% Lead (Pb)-Free
Applications
Ordering Information
RT9012-
Package Type
QW : WDFN-8L 2x2 (W-Type)
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Output Voltage : VOUT1/VOUT2
VOUT2 > VOUT1 is Recommended
Note :
Richtek products are :
½
CDMA/GSM Cellular Handsets
Battery-Powered Equipment
Laptop, Palmtops, Notebook Computers
Hand-Held Instruments
PCMCIA Cards
Portable Information Appliances
Pin Configuration
(TOP VIEW)
VIN
1
EN1
2
EN2
3
SET
4
8
9
7
6
5
VOUT1
VOUT2
POR
GND
WDFN-8L 2x2
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.
Available Voltage Version
Code
A
D
G
K
N
R
V
Voltage Code Voltage
3.5
1.85
1.8
2.6
2.85
3.2
2.9
B
E
H
L
P
S
W
1.3
2.1
2
2.7
3
3.3
1.6
Code Voltage
C
F
J
M
Q
T
Y
1.2
1.5
2.5
2.8
3.1
2.65
1.9
½
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9012-10 July 2017
www.richtek.com
1
RT9012
Typical Application Circuit
100K
V
IN
VIN
C
IN
1uF
Chip Enable
EN1
EN2
SET
GND
C
DELAY
RT9012
POR
VOUT1
C
OUT1
1uF
C
OUT2
1uF
V
OUT1
VOUT2
V
OUT2
Functional Pin Description
Pin No.
1
2
3
4
5
6
7
8
9 (Exposed Pad)
Pin Name
VIN
EN1
EN2
SET
GND
POR
VOUT2
VOUT1
GND
Supply input.
Chip enable1 (Active high).
Chip enable2 (Active high).
Delay set input. Connect external capacitor to GND to set the internal delay.
Common ground.
Power-On reset output : Open-drain output. Active low indicates an output
under-voltage condition on regulator 2.
Channel 2 output voltage.
Channel 1 output voltage.
The exposed pad must be soldered to a large PCB and connected to GND for
maximum power dissipation.
Pin Function
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS9012-10 July 2017
RT9012
Functional Block Diagram
EN1
0.2uA
Shutdown
and
Logic Control
VIN
V
REF
-
+
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
SET
POR& Delay
POR
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9012-10 July 2017
www.richtek.com
3
RT9012
Absolute Maximum Ratings
(Note 1)
6V
6V
0.606W
165°C/W
150°C
Supply Input Voltage ------------------------------------------------------------------------------------------------------
Other I/O Pin Voltages ---------------------------------------------------------------------------------------------------
Power Dissipation, P
D
@ T
A
= 25°C
WDFN-8L 2x2 --------------------------------------------------------------------------------------------------------------
Package Thermal Resistance (Note 2)
WDFN-8L 2x2,
θ
JA
---------------------------------------------------------------------------------------------------------
Junction Temperature -----------------------------------------------------------------------------------------------------
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 ------------------------------------------------------------------------------------------------------
Operation Junction Temperature Range ------------------------------------------------------------------------------
Operation Ambient Temperature Range ------------------------------------------------------------------------------
Electrical Characteristics
(V
IN
= V
OUT
+ 1V, V
EN
= V
IN
, C
IN
= C
OUT
= 1μF, T
A
= 25°C, unless otherwise specified.)
Parameter
Input Voltage
Dropout Voltage
(Note 5)
Symbol
V
IN
V
DROP
V
OUT
V
V
LINE
Test Conditions
V
IN
= 2.5V to 5.5V
I
OUT
= 150mA
I
OUT
= 300mA
Min
2.5
--
--
1.2
Typ
--
120
240
--
--
--
--
450
58
--
--
--
100
170
40
Max
5.5
--
--
3.5
+2
0.2
0.6
700
80
1
--
0.4
--
--
--
Unit
V
mV
mV
V
%
%/V
%
mA
A
A
V
ppm/C
C
C
Output Voltage Range
V
OUT
Accuracy
Line Regulation
Load Regulation
Current Limit
Quiescent Current
Shutdown Current
EN Threshold
Output Voltage TC
Thermal Shutdown
Thermal Shutdown Hysteresis
I
OUT
= 1mA
V
IN
= (V
OUT
+ 0.3V) to 5.5V or
V
IN
> 2.5V, whichever is larger
2
--
--
330
--
--
1.5
--
--
--
--
V
LOAD
1mA < I
OUT
< 300mA
R
LOAD
= 1
I
Q
I
Q_SD
V
IH
V
IL
T
SD
T
SD
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
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS9012-10 July 2017
RT9012
Parameter
PSRR
I
LOAD
= 10mA
Symbol
Test Conditions
f =100Hz
PSRR
f =1kHz
f =10kHz
PSRR
I
LOAD
= 150mA
Power Good
V
THL
Reset Threshold
V
THH
POR Output Logic Low Voltage
POR Leakage Current
Set pin Current Source
Set pin Threshold
V
OL
I
POR
Low threshold, % of nominal V
OUT2
(Flag on)
High threshold, % of nominal
V
OUT2
(Flag off)
I
LOW
= 250A
Flag off
V
SET
= 0
POR = high
90
--
--
1
0.60
--
--
--
0.02
0.01
1.25
1.4
--
96
0.1
1
1.70
--
%
%
V
A
A
V
f =100Hz
PSRR
f =1kHz
f =10kHz
Min
--
--
--
--
--
--
Typ
65
60
50
65
50
50
Max
--
--
--
--
--
--
dB
dB
Unit
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 thermal conductivity test board of
JEDEC 51-3 thermal measurement standard.
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.
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9012-10 July 2017
www.richtek.com
5
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