DatasheetsPDF.com

A8431 Datasheet

Part Number A8431
Manufacturers Allegro MicroSystems
Logo Allegro MicroSystems
Description White LED Driver Constant Current Step-up Converter
Datasheet A8431 DatasheetA8431 Datasheet (PDF)

www.DataSheet4U.com Preliminary Data Sheet Subject to Change without Notice April 5, 2005 A8431 The A8431 is a noninverting boost dc-dc converter that provides a programmable constant current output up to 32 V for driving white LEDs in series.The A8431 also offers an OVP (overvoltage protection) pin. Driving the LEDs in series ensures identical currents and uniform brightness. Up to four white LEDs can be driven at 20 mA from a single cell Li-ion or a multicell NiMH power source. Up to two par.

  A8431   A8431






Part Number A8439
Manufacturers Allegro MicroSystems
Logo Allegro MicroSystems
Description Photoflash Capacitor Charger
Datasheet A8431 DatasheetA8439 Datasheet (PDF)

www.DataSheet4U.com A8439 Photoflash Capacitor Charger with IGBT Driver and Refresh Features and Benefits ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ Power with 1 Li+ or 2 Alkaline/NiMH/NiCAD batteries Adjustable output voltage Auto-refresh >75% efficiency Eight-level, digitally-programmable current limit Charge complete indication Integrated IGBT driver with trigger No primary-side Schottky diode needed Low-profile package (0.75 mm nominal height) Description The A8439 is a highly integrated IC that charges photoflas.

  A8431   A8431







Part Number A8438
Manufacturers Allegro MicroSystems
Logo Allegro MicroSystems
Description Photoflash Capacitor Charger
Datasheet A8431 DatasheetA8438 Datasheet (PDF)

www.DataSheet4U.com A8438 Package EJ: MLP/TDFN, 3 × 3 mm 0.75 mm nominal height Photoflash Capacitor Charger with IGBT Driver FEATURES Power with 1 Li+ or 2 Alkaline/NiMH/NiCAD batteries Adjustable output voltage >75% efficiency Three levels of switch current limit: 1.6, 1.8, 2.0 A Fast charge time Charge complete indication Integrated IGBT driver with trigger No primary-side Schottky diode needed Low-profile package (0.75 mm nominal height) Approximate Scale 1:1 The A8438 is a highly integ.

  A8431   A8431







Part Number A8437
Manufacturers Allegro MicroSystems
Logo Allegro MicroSystems
Description Mobile Phone Xenon Photoflash Capacitor Charger
Datasheet A8431 DatasheetA8437 Datasheet (PDF)

A8437 Mobile Phone Xenon Photoflash Capacitor Charger with IGBT Driver Discontinued Product This device is no longer in production. The device should not be purchased for new design applications. Samples are no longer available. Date of status change: March 4, 2013 Recommended Substitutions: For existing customer transition, and for new customers or new applications, contact Allegro Sales. NOTE: For detailed information on purchasing options, contact your local Allegro field applications enginee.

  A8431   A8431







Part Number A8436
Manufacturers Allegro MicroSystems
Logo Allegro MicroSystems
Description Photoflash Capacitor Charger
Datasheet A8431 DatasheetA8436 Datasheet (PDF)

www.DataSheet4U.com A8436 Photoflash Capacitor Charger with IGBT Driver Features and Benefits ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ Power with 1 Li+ or 2 Alkaline/NiMH/NiCAD batteries Adjustable output voltage >75% efficiency Three levels of switch current limit: 1.0, 1.2, 1.4 A Fast charge time Charge complete indication Integrated IGBT driver with trigger No primary-side Schottky diode needed Low-profile package (0.75 mm nominal height) Description The A8436 is a highly integrated IC that charges photoflash cap.

  A8431   A8431







Part Number A8435
Manufacturers Allegro MicroSystems
Logo Allegro MicroSystems
Description High Efficiency Charge Pump White LED Driver
Datasheet A8431 DatasheetA8435 Datasheet (PDF)

www.DataSheet4U.com A8435 High Efficiency Charge Pump White LED Driver Features and Benefits ▪ ▪ ▪ ▪ ▪ Proprietary adaptive control scheme (1×, 1.5×) Maximum efficiency, over 92% 0.5% LED current matching 1 MHz operating frequency Flexible dimming control: ▫ Serial 11-level dimming, down to 5% ▫ PWM ▫ 2-bit parallel Drives up to 4 white LEDs 30 mA per LED 120 mA total continuous output Low input ripple and EMI Soft-start limits inrush current Short circuit protection Overvoltage protection The.

  A8431   A8431







White LED Driver Constant Current Step-up Converter

www.DataSheet4U.com Preliminary Data Sheet Subject to Change without Notice April 5, 2005 A8431 The A8431 is a noninverting boost dc-dc converter that provides a programmable constant current output up to 32 V for driving white LEDs in series.The A8431 also offers an OVP (overvoltage protection) pin. Driving the LEDs in series ensures identical currents and uniform brightness. Up to four white LEDs can be driven at 20 mA from a single cell Li-ion or a multicell NiMH power source. Up to two parallel strings of eight white LEDs can be driven at 20 mA by increasing the supply voltage up to 10 V. The A8431 incorporates a power switch and a feedback sense amplifier to provide a solution with minimum external components. The output current can be set by adjusting a single external sense resistor and can be varied with a voltage or a filtered PWM signal when dimming control is required. The high switching frequency of 1.2 MHz allows the use of small inductor and capacitor values. The A8431 is provided in a 0.75 mm high, 6-pin, 2 x 3 mm MLP package. It is lead (Pb) free, with 100% matte tin leadframe plating. White LED Driver Constant Current Step-up Converter A8431 MLPD Approximate actual size SW GND FB 1 2 3 6 5 4 VIN OVP EN RθJA = 50 °C/W, see note 1, page 2 FEATURES Output voltage up to 32 V (OVP level) 2.5 V to 10 V input Drives up to 4 LEDs at 20 mA from a 2.5 V supply Drives up to 5 LEDs at 20 mA from a 3 V supply 1.2 MHz switching frequency 300 mA switch current li.


2007-03-14 : STV0288    1SS400C2    1SS400CS    2N60    A3988    A8286    A8430    A8431    A8436    A8438   


@ 2014 :: Datasheetspdf.com ::
Semiconductors datasheet search & download site (Privacy Policy & Contact)