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Microsoft word - sp1938.doc

DC-DC Step-Up Converter for White LED
DESCRIPTION
APPLICATIONS
The SP1938 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 Internal functions include current limiting; thermal shutdown; OVP and soft-start to prevent damage operate status. The SP1938 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 SP1938 is available in small package SOT-23-6L. FEATURES
PIN CONFIGURATION(SOT-23-6L)
Current Source with Over Voltage Protection Internal Over Temperature and Current Limiting PART MARKING
2009/03/30 Ver.1
DC-DC Step-Up Converter for White LED

TYPICAL APPLCATION CIRCUIT

PIN DESCRIPTION

Description
Connect cathode of lowest LED and resistor here Combined active low enable and PWM control pin for LED dimming Over voltage Protection and Connect to the output capacitor of the Converter
ORDERING INFORMATION

Part Number
Part Marking
※ Week Code : A ~ Z( 1 ~ 26 ) ; a ~ z( 27 ~ 52 )
※ SP1938S26RGB : Tape Reel ; Pb – Free ; Halogen -Free

2009/03/30 Ver.1
DC-DC Step-Up Converter for White LED

BLOCK DIAGRAM


ABSOULTE MAXIMUM RATINGS
(TA=25℃ Unless otherwise specified)
Parameter Symbol
The IC has a protection circuit against static electricity. Do not apply high static electricity or high voltage that exceeds the performance of the protection circuit to the IC. 2009/03/30 Ver.1
DC-DC Step-Up Converter for White LED

ELECTRICAL CHARACTERISTICS
(TA=25℃, VIN=3V, VSHDN=3V, Unless otherwise specified)
Parameter Conditions

APPLICATION CIRCUIT
2009/03/30 Ver.1
DC-DC Step-Up Converter for White LED

SOT-23-6L PACKAGE OUTLINE

2009/03/30 Ver.1
DC-DC Step-Up Converter for White LED




Information provided is alleged to be exact and consistent. SYNC Power Corporation presumes no responsibility for the
penalties of use of such information or for any violation of patents or other rights of third parties which may result from its use.
No license is granted by allegation or otherwise under any patent or patent rights of SYNC Power Corporation. Conditions
mentioned in this publication are subject to change without notice. This publication surpasses and replaces all information
previously supplied. SYNC Power Corporation products are not authorized for use as critical components in life support
devices or systems without express written approval of SYNC Power Corporation.
The SYNC Power logo is a registered trademark of SYNC Power Corporation 2004 SYNC Power Corporation – Printed in Taiwan – All Rights Reserved NanKang District (NKSP), Taipei, Taiwan 115 2009/03/30 Ver.1

Source: http://www.keyen.com.tw/upload/6/file189.pdf

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