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SM8134A датащи(PDF) 1 Page - Nippon Precision Circuits Inc |
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SM8134A датащи(HTML) 1 Page - Nippon Precision Circuits Inc |
1 / 19 page SM8134A SEIKO NPC CORPORATION —1 White LED Driver IC OVERVIEW The SM8134A is a charge pump type white LED driver. It can drive 1 to 4 backlight white LED connected in parallel and 1 flash white LED, making the device ideal for camera-equipped cellular phones. The charge pump switches between ×1 to ×1.5 boost mode in response to LED drive current requirements to extend bat- tery life to the maximum. The boost switching occurs in response to the drive current of all the connected LED and thus supports variations in LED forward-bias voltage drop (VF). Each LED drive current is controlled by a 5-channel LED drive current control circuit. The backlight LED drive current and ON/OFF control, and flash LED drive current and ON/OFF control are all set by 3-wire serial interface data input. Also, an under voltage lockout (UVLO) circuit is built-in to prevent incorrect operation when the battery voltage drops. FEATURES I Noise reduction due to charge pump boost circuit I Automatic charge pump switching to conserve power I Drives 1 to 4 backlight white LED (30mA/ch at maximum setting) I Drives a flash white LED (150mA at maximum setting) I Backlight and flash white LED brightness adjustment I 3-wire serial input interface for all setting and control I Under voltage lockout (UVLO) circuit built-in I Soft start circuit built-in I Thermal protection circuit built-in I Input voltage range • No-load current (IOUT = 0mA): 2.7 to 4.6V • Load current (IOUT = 80mA): 3.0 to 4.6V • Load current (IOUT = 180mA): 3.3 to 4.6V • Load current (IOUT = 200mA): 3.4 to 4.6V I Quiescent current • Not-switching ( ×1.0 mode): 0.3mA (typ) • Switching ( ×1.5 mode): 1.7mA (typ) I Standby current: 0.01 µA (typ) I Operating frequency: 750kHz (typ) I Maximum backlight LED current: 30mA/ch I Maximum flash LED current: 150mA I All LED total maximum current: 200mA I Backlight LED current matching (ILED = 20mA) : ± 3% I Flash LED current accuracy (ILED = 150mA) : ± 6.7% I Packages: 16-pin QFN PINOUT (Top view) PACKAGE DIMENSION (Unit: mm) APPLICATIONS I Cellular phone I Digital still camera I PDA I Portable games ORDERING INFORMATION Device Package SM8134AB 16-pin QFN SDA DIN1 VOUT VIN DIN3 DIN4 DIN5 PGND TOP VIEW BOTTOM VIEW 3.0 ± 0.08 0.22 ± 0.05 C 0.3 1.8 ∆ 0.05 M S 0.2 S AB 0.5 B SA 0.2 S S 0.05 A B |
Аналогичный номер детали - SM8134A |
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Аналогичное описание - SM8134A |
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