Document
RP1222
300mA Adjustable Output Voltage CMOS LDO Regulator
General Description
The RP1222 is designed for portable RF and wireless applicaiton with demanding performance and space requirements. The RP1222 performance is optimized for battery-powered systems to deliver low noise and low quiescent current. Regulator ground current increase only slightly in dropout, further prolonging the battery life. The RP1222 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, ciritical in hand-held wireless devices. The RP1222 has soft start time typical 1300µs.The other features include ultra low dropout voltage, current limiting protection, and high ripple rejection ratio. Availabe in the 5-lead of SOT-23 package.
Features
Adjustable Output Voltage Ultra-Fast Response in Line/Load Transient Long Soft Start Time for Low Inrush Current (Typically 1300µs) < 0.1µA Standby Current When Shutdown Low Dropout : 220mV @ 300mA Wide Operating Voltage Ranges : 2.5V to 5.5V TTL-Logic-Controlled Shutdown Input Low Temperature Coefficient Current Limiting Protection Thermal Shutdown Protection Only 1µF Output Capacitor Required for Stability High Power Supply Rejection Ratio RoHS Compliant and 100% Lead (Pb)-Free
Ordering Information
RP1222
Package Type B : SOT-23-5
Operating Temperature Range G : Green (Halogen Free with Comme-rcial Standard )
Output Voltage A : High Enable without Discharge B : High Enable with Discharge C : Low Enable without Discharge D : Low Enable with Discharge
Applications
Power source for battery-powered equipment Power source for cameras, camcorders, VCRs, PDAs, pagers, electronic data banks, and hand-held communication equipment Power source for appliances, which require higher voltage than that of batteries used in the appliances
Note : Richpower Green 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 Richpower distributor located in your area.
Pin Configurations
(TOP VIEW)
ADJ VOUT 54 23
EN/EN GND VIN SOT-23-5
RP1222-02P Feb 2010
1
RP1222
Typical Application Circuit
VIN CIN
1µF X7R
Chip Enable
VIN VOUT
VOUT
R1 COUT 1µF X7R
RP1222 ADJ
R2
EN/EN
GND
Functional Pin Description
Pin NO. Pin Name
Pin Function
1 EN/EN
Chip Enable (Active High/Low). Note that this pin is high impedance.There should be a pull low/high 100kΩ resistor connected to GND/VIN when the control signal is floating.
2 GND
Ground.
3 VIN
Power Input Voltage.
4 VOUT 5 ADJ
Output Voltage. Adjust Output.
Function Block Diagram
EN Shutdown and
Soft Logic Control Start
VREF
ADJ
+ MOS Driver -
Error Amplifier
Current Limit and
Thermal Protection
RP1222B/D Only
VIN
VOUT GND
2 RP1222-02P Feb 2010
RP1222
Absolute Maximum Ratings (Note 1)
Supply Voltage (VIN) ----------------------------------------------------------------------------------------------- −0.3V to 6V Chip Enable Input Voltage (VEN) --------------------------------------------------------------------------------- −0.3V to 6V Output Voltage (VOUT) --------------------------------------------------------------------------------------------- −0.3V to VOUT +0.3V Adjust Output (VADJ) ----------------------------------------------------------------------------------------------- −0.3V to VOUT +0.3V
Power Dissipation, PD @ TA = 25° C SOT-23-5 -------------------------------------------------------------------------------------------------------------- 0.4W Package Thermal Resistance (Note 4) SOT-23-5, θJA ------------------------------------------------------------------------------------------------------- 250°C/W
Operating Temperature Range ----------------------------------------------------------------------------------- −40°C to 85°C Storage Temperature Range -------------------------------------------------------------------------------------- −65°C to 150°C
Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------ 260°C ESD Susceptibility (Note 2) HBM (Human Body Mode) --------------------------------------------------------------------------------------------- 2kV MM (Machine Mode) ---------------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions (Note 3)
Supply Voltage VIN ------------------------------------------------------------------------------------------------------ 2.4V to 5.5V
Junction Temperature Range ------------------------------------------------------------------------------------- −40°C to 125°C
Electrical Characteristics
(VIN = VOUT + 1V, CIN = COUT = 1uF, TA = 25°C, unless otherwise specified)
Parameter Input Voltage Range ADJ Reference Voltage Current Limit Quiescent Current
Dropout Voltage
Line Regulation Load Regulation Standby Current EN .