Selecting an Linear Regulator (LDO)

Richtek Popular LDO Product Family

• General Purpose with Fixed V_OUT and Adjustable V_OUT
• Low V_IN & Low V_OUT for Intersystem Applications
• Ultra Low I_Q for Battery Applications
• Industrial Applications
• Automotive Applications
• Others

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General Purpose PMOS LDO with Fixed V_OUT

IOUT	VIN	VOUT	Key Features	VDropout	P/N
300mA	2.5V~5.5V	1.5~5.0V	EN pin	220mV@300mA	RT9193  RT9198/RT9198A
500mA	2.2V~5.5V	1.2~2.85V	EN pin Ultra low noise	250mV@500mA	RT9013
500mA	2.5V~5.5V	1.2~3.3V	External soft start Low noise	250mV@500mA	RT9020
300/600mA	3.0V~5.5V	1.2V~4.5V	Available in various packages	230mV@300mA 580mV@600mA	RT9166/RT9166A

General Purpose PMOS LDO with Adjustable V_OUT

IOUT	VIN	VOUT	Key Features	VDropout	P/N
400mA	2.2V~5.5V	1.2V~5.5V	EN pin High PSRR	230mV@400mA	RT9043
400mA	2.2V~5.5V	0.8V~VIN	EN pin Ultra fast response in line/load transient 35μA Low IQ	230mV@400mA	RT9053A
500mA	2.5V~5.5V	0.8V~4.5V Or Fixed	EN pin PGOOD	160mV@500mA	RT9186A
1A	2.5V~5.5V	1V~3.3V	LDO dropout	240mV@1A	RT9187

Low V_IN & Low V_OUT for Intersystem Applications

IOUT	VIN	VOUT	Type	Key Features	VDropout	P/N
150mA	1.65V~5.5V	1.0V~3.3V (Adj.)	PMOS	EN pin	100mV@150mA	RT9030
300mA	1.5V~5.5V	1.0V~3.3V (Adj.)	PMOS	EN pin	300mV@300mA	RT9030A
500mA	1.0V~5.5V VIN 3V~5.5V VDD	1V~2V (Fixed or Adj.)	NMOS	EN pin PGOOD pin	300mV@500mA	RT9041A/RT9041B  RT9041E
2A	1.4V~6V	0.5V~5V (Adj.)	NMOS+ charge pump	EN pin	400mV@2A	RT9048
2A	1V~5.5V VIN 3V~5.5V VDD	1.05V~2.5V (Fixed or Adj.)	NMOS	EN pin PGOOD pin	230mV@2A	RT9025
3A	1.4V~5.5V VIN 3V~5.5V VDD	1.05V~2.5V (Fixed or Adj.)	NMOS	EN pin PGOOD pin	210mV@3A	RT9018A
3A	1V~5V VIN 3V~5.5V VDD	1.5V/1.8V/2.5V (Fixed or Adj.)	NMOS	EN pin PGOOD pin 3msec SS	350mV@3A	RT9059

Ultra Low I_Q for Battery Applications

IQ	IOUT	VIN	VOUT	Key Features	VDropout	P/N
4μA	100mA	2.0V~6V	1.2V~5.0V (Adj.)	EN pin in SOT-23-5	450mV@10mA	RT9169/RT9169H
2μA	200mA	3.5V~14V	2.5V, 3.3V, 5.0V		400mV@100mA	RT9064
2μA	200mA	3.5V~14V	2.5V~9.0V (Fixed)	EN pin w/0.1μA shutdown	400mV@100mA	RT9067
2μA	100mA	3.5V~36V	2.5V~12V (Fixed)		350mV@10mA	RT9058
2μA	200mA	3.5V~36V	2.5V~12V (Fixed)	EN pin	330mV@10mA	RT9069
1μA	250mA	2.5V~6.0V	1.2V~3.3V (Fixed)		400mV@200mA	RT9063
1μA	250mA	1.2V~5.5V	0.9V~3.3V (Fixed)	EN pin With output voltage sense	500mV@250mA	RT9073

Industrial Applications (Wide V_IN and /or Wide Temperature Range)

IOUT	VIN	VOUT	Key Features	VDropout	P/N
1A	1.4V~6V	0.5V to 5.5V Adj.	EN pin wide VIN range with internal charge pump	200mV@1A	RT2518

Read more :
Powering Microcontrollers from Industrial Supply Rails

Automotive Applications

IOUT	VIN	VOUT	Key Features	VDropout	P/N
100mA	3.5V~36V	2.5V~12V fixed	AECQ-100 qualified 2μA ultra low IQ	550mV@10mA	RT2560Q
50mA	4.5V~60V	2.5V, 3.3V, 5V Fixed 1.25V~60V Adj.	low IQ -60V reverse protection	230mV@50mA	RT9068
20mA	4.5V~80V	1.25V~60V Adj.	23μA low IQ -80V reverse protection	180mV@20mA	RT9072A/RT9072B
1A	2.2V~6V	1.2V to (VIN-VDropout) Adj.	AECQ-100 qualified	200mV@1A	RT2517B

Read more :
Wide Input Voltage LDO RT9068 for Automotive and Industrial Applications

Others

IOUT	VIN	VOUT	Key Features	VDropout	P/N
60mA	5V~20V	1.3V to (VIN-VDropout) Adj.	Adjustable soft-start time EN pin	200mV@30mA	RT9022
300/500mA	12V	1.5V~5.0V Adj.	General purpose	450mV@300mA 750mV@500mA	RT9161/RT9161A
1A	12V	1.5V~3.5V Fixed 1.5V~5.5V Adj.	General purpose for larger voltage drop applications	1.15V@500mA 1.3V@1A	RT9164A
Ext MOS	VIN by ext MOS VCC 4.5V~13.5V	0.8V~12V	LDO controller Wide VOUT range Adjustable Soft-start	By ext MOSFET	RT9008
Ext MOS	VIN by ext MOS VCC 4.5V~13.5V	0.8V~12V	LDO controller Wide VOUT range PGood pin	By ext MOSFET	RT9194

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