Richtek RT9012-FMPQV, RT9012-FMPQW, RT9012-FSPQW, RT9012-GMPQV, RT9012-GMPQW Schematic [ru]
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300mA Dual LDO Regulator with POR
RT9012
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)
Features
z Wide Operating Voltage Ranges : 2.5V to 5.5V
z Low-Noise for RF Application
z No Noise Bypass Capa citor Required
z Fast Response in Line/Load Transient
z TTL-Logic-Controlled Shutdown Input
z Low Temperature Coefficient
zz
z Dual LDO Outputs (300mA/300mA)
zz
zz
z Ultra-low Quiescent Current 27uA/LDO
zz
zz
z High Output Accuracy 2%
zz
zz
z Short Circuit Protection
zz
zz
z Thermal Shutdown Protection
zz
zz
z Current Limit Protection
zz
zz
z Short Circuit Thermal Folded Back Protection
zz
zz
z Tiny 8-Lead WDFN Package
zz
zz
z RoHS Compliant and 100% Lead (Pb)-Free
zz
Applications
zz
z CDMA/GSM Cellular Handsets
zz
zz
z Battery-Powered Equipment
zz
zz
z Laptop, Palmtops, Notebook Computers
zz
zz
z Hand-Held Instruments
zz
zz
z PCMCIA Cards
zz
zz
z Portable Information Appliances
zz
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Output Voltage : VOUT1/VOUT2
VOUT2 > VOUT1 is Recommended
Note :
Pin Configurations
(TOP VIEW)
1
VIN
2
EN1
3
EN2
4
SET
WDFN-8L 2x2
8
VOUT1
7
VOUT2
POR
6
9
5
GND
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.
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Available Voltage Version
Code Voltage Code Voltage Code Voltage
A 3.5 B 1.3 C 1.2
D 1.85 E 2.1 F 1.5
G 1.8 H 2 J 2.5
K 2.6 L 2.7 M 2.8
N 2.85 P 3 Q 3.1
R 3.2 S 3.3 T 2.65
V 2.9 W 1.6 X 3.15
Y 1.9
DS9012-09 April 2011 www.richtek.com
1
RT9012
Typical Application Circuit
100K
V
IN
C
IN
1uF
Chip Enable
C
DELAY
VIN
EN1
EN2
SET
RT9012
VOUT1
VOUT2
GND
Functional Pin Description
Pin No. Pin Na me P in Func tion
1 VIN Supply Input.
2 EN1 Chip Enable1 (Active High).
3 EN2 Chip Enable2 (Active High).
4 SET Delay Set Input. Connect external capacitor to GND to set the internal delay.
5 GND Common Ground.
POR
C
OUT1
1uF
C
OUT2
1uF
V
V
OUT1
OUT2
6 POR
7 VOUT2 Channel 2 Output Voltage.
8 VOUT1 Channel 1 Output Voltage.
9 (Exposed Pad) GND
Power-On Reset Output : Open-drain output. Active low indicates an output
under-voltage condition on regulator 2.
The exposed pad must be soldered to a large PCB and connected to GND
for maximum power dissipation.
DS9012-09 April 2011www.richtek.com
2
Function Block Diagram
RT9012
EN1
EN2
0.2uA
0.2uA
Shutdown
and
Logic Control
V
REF
-
+
Error
Amplifier
Shutdown
Logic Control
V
REF
-
+
Error
Amplifier
MOS Driver
Current-Limit
and
Thermal
Protection
and
MOS Driver
Current-Limit
and
Thermal
Protection
VIN
VOUT1
GND
VOUT2
SET
POR& Delay
GND
POR
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, P
WDFN-8L 2x2 -------------------------------------------------------------------------------------------------------------- 0.606W
z Package Thermal Resistance (Note 2)
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)
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
@ T
D
= 25°C
A
Electrical Characteristics
(V
= V
OUT
+ 1V, V
IN
Parameter Symbol Test Conditions Min Typ Max Unit
Input Voltage
Dropout Voltage (Note 5)
Output voltage range
V
Accuracy
OUT
Line Regulation
Load Regulation
Current Limit
Quiescent Current
Shutdown Current
EN Threshold
Output Voltage TC -- 100 -- ppm/°C
= VIN, C
EN
= C
IN
= 1μF, TA = 25°C, unless otherwise specified.)
OUT
V
V
IN
V
DROP
V
OUT
ΔV
ΔV
LINE
ΔV
LOA D
I
VEN > 1.5V
Q
I
VEN < 0.4V
Q_SD
VIH V
V
V
IL
= 2.5V to 5.5V
IN
I
= 150mA
OU T
= 300mA
I
OU T
1.2 -- 3.6 V
I
= 1mA
OU T
V
= (V
IN
> 2.5V, whichever is larger
V
IN
1mA < I
R
LOA D
= 2.5V to 5.5V, Power On
IN
= 2.5V to 5.5V, Shutdown
IN
+ 0.3V) to 5.5V or
OUT
< 300mA
OUT
= 1Ω
2.5 -- 5.5 V
-- 120 --
mV
-- 240 -- mV
-2 -- +2 %
-- -- 0.2 %/V
-- -- 0.6 %
330 450 700 mA
-- 58 80 μA
-- -- 1 μA
1.5 -- -V
-- -- 0.4
Thermal Shutdown
Thermal Shutdown Hysteresis
4
T
ΔT
SD
SD
-- 170 -- °C
-- 40 --
°C
To be continued
DS9012-09 April 2011www.richtek.com
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