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| aqlN/|- 1/2 q Weltrend Semiconductor, Inc. WT7220 Current Regulator for LED Data Sheet REV. 0.10 NOV 16, 2005 The information in this document is subject to change without notice. Weltrend Semiconductor, Inc. All Rights Reserved. *s|Ei3/4Cu*~eIu*~FEo 24 2 1/4O th 2F, No. 24, Industry E. 9 RD., Science-Based Industrial Park, Hsin-Chu, Taiwan TEL:886-3-5780241 FAX:886-3-5794278.5770419 Email:support@weltrend.com.tw WT7220 Data Sheet Rev. 0.10 GENERAL DESCRIPTION The WT7220 is a current regulator which provide 350mA constant sink current. It is optimal for use as LED drive. FEATURES * Low quiescent current * Low standby current <1uA. * Miniature package SOT-89 * Built-in thermal protection PIN CONFIGURATION PIN DESCRIPTION Pin No. Pin Name 1 VDD 2 GND 3 OUT TYPE P Power supply input. P Ground. O Output. FUNCTION Weltrend Semiconductor, Inc. Page 2 WT7220 Data Sheet Rev. 0.10 BLOCK DIAGRAM Absolute Maximum Operating Range, Ta=+25J CHARACTERISTICS Maximum supply voltage H-bridge output voltage Operating temperature Storage temperature SYMBOL VCC VOUT Topr Tstg 3 VALUE -0.3 to +7.0 -0.3 to +7.0 -20 ~ +75 -40 ~ +150 Unit V V J J *Note: Mounted on the 114.3x76.1x1.6 mm glass-epoxy board. Electrical Characteristics (VDD=4V,Ta= +25J) Parameter Output Current Operating current Dissipation Load Regulation Line Regulation Thermal Protection Temperature Symbol IOUT IDD Conditions Vout=0.6V-3V Vout=0.2V-3V VDD=3V-6V Tpt 120 Min. 310 Typ. 350 0.3 Max. 390 5 5 Unit mA mA mA/V mA/V o C Weltrend Semiconductor, Inc. Page 3 WT7220 Data Sheet Rev. 0.10 TYPICAL APPLICATION Weltrend Semiconductor, Inc. Page 4 |
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