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    The CST9201 series is a high voltage，ultralow-power，low dropout voltage regulator. The device can deliver 350mA output current with a dropout voltage of 350mV and allows an input voltage as high as 55V. The typical quiescent current is only 2µA. The device is available in fixed output voltages of 1.8,2.5,2.8,3.0,3.3,3.6,4.0,4.2,4.4 and 5.0V.The device features integrated short-circuit protection、thermal shutdown protection and CE function enables the output to be turned off.Although designed primarily as fixed voltage regulators, The limiter‘s feedback circuit also operates as a protect for the output current limite, the device can be used with external components to obtain variable voltages.

CST9201 Features:

Low Power Consumption: 2µA (Typ) 

Maximum Output Current: 350mA Protection

Small Dropout Voltage 

    350mV@100mA (Vout=3.3V)

PSRR=85dB@1KHz 

High Input Voltage: Up to 55V

High Accurate: ±2%

    (±1% customized)

RoHS Compliant and Lead (Pb) Free 

Good Transient Response

Integrated Short-Circuit 

Over-Temperature Protection

Output Current Limit

Stable with Ceramic Capacitor

Support Fixed Output Voltage

    1.8,2.5,2.8.3.0,3.3,3.6,4.0,4.2 and 5.0V

Available Package

    SOT23-5 \ SOT89-5

CST9201 Application:

Portable, Battery Powered Equipment

Battery-powered equipment

Weighting Scales

Smoke detector and sensor

Audio/Video Equipmen

Home Automation

CST9201 Application Circuits:

CST9201 Pin Configuration:

CST9201 Order Information:

Designator	Symbol	Description
①②	S5 / P5	SOT23-5L / SOT89-5L
③④	Integer	Output Voltage 1.8,2.5,2.8.3.0,3.3,3.6,4.0,4.2 and 5.0V
⑤	A	Accurate ±1% customized
	B	Accurate ±2%

Model	Marking**	Description	Package	T/R Qty
CST9201S5-XX	AH=XX	CST9201 55V;2µA IQ, 350mA Low-Dropout LDO ±2%	SOT23-5L	3,000 PCS
CST9201P5-XX	AHXXC		SOT89-5L	1,000 PCS
CST9201S5-XX	AH-XX	CST9201 55V;2µA IQ,	SOT23-5L	3,000 PCS
CST9201P5-XX	AHXXG	350mA Low-Dropout LDO ±1%	SOT89-5L	1,000 PCS

CST9201 Function Block Diagram: