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 3.6V 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.
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 :
`RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.
`Suitable for use in SnPb or Pb-free soldering processes.
Marking Information
For marking information, contact our sales representative directly or through a Richtek distributor located in your area.
Features
zWide Operating Voltage Ranges : 2.5V to 5.5V
zLow-Noise for RF Application
zNo Noise Bypass Capacitor Required
zFast Response in Line/Load Transient
zTTL-Logic-Controlled Shutdown Input
zLow Temperature Coefficient
zDual LDO Outputs (300mA/300mA)
zUltra-low Quiescent Current 27uA/LDO
zHigh Output Accuracy 2%
zShort Circuit Protection
zThermal Shutdown Protection
zCurrent Limit Protection
zShort Circuit Thermal Folded Back Protection
zTiny 8-Lead WDFN Package
zRoHS Compliant and 100% Lead (Pb)-Free
Applications
zCDMA/GSM Cellular Handsets
zBattery-Powered Equipment
zLaptop, Palmtops, Notebook Computers
zHand-Held Instruments
zPCMCIA Cards
zPortable Information Appliances
Pin Configurations
(TOP VIEW)
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VIN |
1 |
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8 |
VOUT1 |
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EN1 |
2 |
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7 |
VOUT2 |
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EN2 |
3 |
9 |
6 |
POR |
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SET |
4 |
5 |
GND |
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WDFN-8L 2x2 |
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Available Voltage Version |
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Code |
Voltage |
Code |
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Voltage |
Code |
Voltage |
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A |
3.5 |
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B |
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1.3 |
C |
1.2 |
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D |
1.85 |
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E |
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2.1 |
F |
1.5 |
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G |
1.8 |
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H |
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2 |
J |
2.5 |
K |
2.6 |
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L |
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2.7 |
M |
2.8 |
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N |
2.85 |
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P |
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3 |
Q |
3.1 |
R |
3.2 |
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S |
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3.3 |
T |
2.65 |
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V |
2.9 |
W |
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1.6 |
X |
3.15 |
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Y |
1.9 |
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DS9012-09 April 2011 |
www.richtek.com |
1
RT9012
Typical Application Circuit
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100K |
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VIN |
VIN |
POR |
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CIN |
RT9012 |
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1uF |
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EN1 |
VOUT1 |
VOUT1 |
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Chip Enable |
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COUT1 |
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EN2 |
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1uF |
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VOUT2 |
VOUT2 |
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SET |
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GND |
COUT2 |
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1uF |
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CDELAY |
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Functional Pin Description |
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Pin No. |
Pin Name |
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Pin Function |
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1 |
VIN |
Supply Input. |
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2 |
EN1 |
Chip Enable1 (Active High). |
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3 |
EN2 |
Chip Enable2 (Active High). |
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4 |
SET |
Delay Set Input. Connect external capacitor to GND to set the internal delay. |
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5 |
GND |
Common Ground. |
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6 |
POR |
Power-On Reset Output : Open-drain output. Active low indicates an output |
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under-voltage condition on regulator 2. |
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7 |
VOUT2 |
Channel 2 Output Voltage. |
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8 |
VOUT1 |
Channel 1 Output Voltage. |
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9 (Exposed Pad) |
GND |
The exposed pad must be soldered to a large PCB and connected to GND |
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for maximum power dissipation. |
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www.richtek.com |
DS9012-09 April 2011 |
2
RT9012
Function Block Diagram
EN1 |
0.2uA |
Shutdown |
VIN |
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and |
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Logic Control |
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VREF |
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- |
MOS Driver |
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+ |
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Error |
VOUT1 |
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Amplifier |
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Current-Limit |
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and |
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Thermal |
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Protection |
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GND |
EN2 |
0.2uA |
Shutdown |
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and |
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Logic Control |
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VREF |
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- |
MOS Driver |
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+ |
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Error |
VOUT2 |
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Amplifier |
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Current-Limit |
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and |
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Thermal |
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Protection |
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GND |
SET |
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POR& Delay |
POR |
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DS9012-09 April 2011 |
www.richtek.com |
3
RT9012
Absolute Maximum Ratings (Note 1)
z Supply Input Voltage ------------------------------------------------------------------------------------------------------ |
6V |
z Other I/O Pin Voltages --------------------------------------------------------------------------------------------------- |
6V |
z Power Dissipation, PD @ TA = 25°C |
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WDFN-8L 2x2 -------------------------------------------------------------------------------------------------------------- |
0.606W |
z Package Thermal Resistance (Note 2) |
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WDFN-8L 2x2, θJA --------------------------------------------------------------------------------------------------------- |
165°C/W |
z Junction Temperature ----------------------------------------------------------------------------------------------------- |
150°C |
z Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- |
260°C |
z Storage Temperature Range -------------------------------------------------------------------------------------------- |
−65°C to 150°C |
z ESD Susceptibility (Note 3) |
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HBM (Human Body Mode) ---------------------------------------------------------------------------------------------- |
2kV |
MM (Machine Mode) ------------------------------------------------------------------------------------------------------ |
200V |
Recommended Operating Conditions |
(Note 4) |
z Supply Input Voltage ------------------------------------------------------------------------------------------------------ |
2.5V to 5.5V |
z Enable Input Voltage ------------------------------------------------------------------------------------------------------ |
0V to 5.5V |
z Operation Junction Temperature Range ------------------------------------------------------------------------------ |
−40°C to 125°C |
z Operation Ambient Temperature Range ------------------------------------------------------------------------------ |
−40°C to 85°C |
Electrical Characteristics
(VIN = VOUT + 1V, VEN = VIN, CIN = COUT = 1μF, TA = 25°C, unless otherwise specified.)
Parameter |
Symbol |
Test Conditions |
Min |
Typ |
Max |
Unit |
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Input Voltage |
VIN |
VIN = 2.5V to 5.5V |
2.5 |
-- |
5.5 |
V |
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Dropout Voltage (Note 5) |
VDROP |
IOUT = 150mA |
-- |
120 |
-- |
mV |
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IOUT = 300mA |
-- |
240 |
-- |
mV |
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Output voltage range |
VOUT |
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1.2 |
-- |
3.6 |
V |
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VOUT Accuracy |
V |
IOUT = 1mA |
-2 |
-- |
+2 |
% |
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Line Regulation |
VLINE |
VIN = (VOUT + 0.3V) to 5.5V or |
-- |
-- |
0.2 |
%/V |
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VIN > 2.5V, whichever is larger |
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Load Regulation |
VLOAD |
1mA < IOUT< 300mA |
-- |
-- |
0.6 |
% |
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Current Limit |
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RLOAD = 1Ω |
330 |
450 |
700 |
mA |
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Quiescent Current |
IQ |
VEN > 1.5V |
-- |
58 |
80 |
μA |
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Shutdown Current |
IQ_SD |
VEN < 0.4V |
-- |
-- |
1 |
μA |
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EN Threshold |
VIH |
VIN = 2.5V to 5.5V, Power On |
1.5 |
-- |
-- |
V |
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VIL |
VIN = 2.5V to 5.5V, Shutdown |
-- |
-- |
0.4 |
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Output Voltage TC |
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-- |
100 |
-- |
ppm/°C |
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Thermal Shutdown |
TSD |
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-- |
170 |
-- |
°C |
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Thermal Shutdown Hysteresis |
TSD |
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-- |
40 |
-- |
° |
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C |
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To be continued |
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www.richtek.com |
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DS9012-09 |
April 2011 |
4