Stanson ST1938S26RG Schematic [ru]

ST1938

DC-DC Step-Up Converter for White LED Driver

DESCRIPTION

The ST1938 is a step-up DC/DC converter for white LED driver with over voltage protection.

The device can driver one to four LEDs in series from a single cell Lithium Ion battery.

Internal functions include current limiting; thermal shutdown; OVP and soft-start to prevent

damage operate status. The ST1938 operates at 0.8MHz and from low input voltages as low as

1.5V; apply to Lithium-Ion powered systems. A low 95mV reference voltage minimizes power

loss in the current setting resistor for better efficiency.

The ST1938 is available in small package SOT-23-6L

PIN CONFIGURATION
SOT23-6L

APPLICATIONS

z Battery Power Equipment
z Notebook Computers
z PDA
z Cellular Phone

PART MARKING

FEATURES

z Current Source with Over Voltage

Protection

z Fast 0.8MHz Switching Frequency
z High Efficiency up to 87%
z Drives up to Four LEDs From 3.2V

Supply

z Drives up to Six LEDs From a 5V Su pply
z Low Quiescent Current
z Disconnects LEDs in Shutdown Mode
z Internal Over Temperature and Current

Limiting Shutdown Function

z Internal Soft-Start Circuit
z 36V Rugged Bipolar Switch
z Available in a Small SOT-23-6L Package

STANSON TECHNOLOGY
120 Bentley Square, Mountain View, Ca 94040 USA
www.stansontech.com

ST1938 2008. V1

ORDERING INFORMATION

※ Week Code : A ~ Z( 1 ~ 26 ) ; a ~ z( 27 ~ 52 )
※ ST1938S26RG : S25 : SOT-23-6 ; R : Tape Reel ; G : Pb – Free

TYPICAL APPLCATION CIRCUIT

ST1938

DC-DC Step-Up Converter for White LED Driver

Part Number Package Part Marking

ST1938S26RG SOT-23-6L 98YW

PIN DESCRIPTION

ST1938S26RG

Pin Symbol Description

1 SW Switch Pin.

2 GND Ground Pin

3 FB Feedback Pin.

4 SHDN

5 VIN Supply Voltage Input

6 OVP

Shutdown Pin. Active-low enable and PWM control

pin for LED dimming

Over voltage Protection and Connect to the output

capacitor of the Converter

STANSON TECHNOLOGY
120 Bentley Square, Mountain View, Ca 94040 USA
www.stansontech.com

ST1938 2008. V1