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A8499 Datasheet

Part Number A8499
Manufacturers Allegro MicroSystems
Logo Allegro MicroSystems
Description High Voltage Step-Down Regulator
Datasheet A8499 DatasheetA8499 Datasheet (PDF)

www.DataSheet4U.com A8499 High Voltage Step-Down Regulator Features and Benefits ▪ ▪ ▪ ▪ ▪ 8 to 50 V input range Integrated DMOS switch Adjustable fixed off-time Highly efficient Adjustable 1.2 to 24 V output Description The A8499 is a step down regulator that will handle a wide input operating voltage range. The A8499 is supplied in a low-profile 8-lead SOIC with exposed pad (package LJ). Applications include: ▪ Printer power supplies ▪ Consumer equipment power supplies Package: 8-Lead SOIC .

  A8499   A8499






Part Number A8498
Manufacturers Allegro MicroSystems
Logo Allegro MicroSystems
Description Wide Input Voltage 3.0A Step Down Regulator
Datasheet A8499 DatasheetA8498 Datasheet (PDF)

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  A8499   A8499







High Voltage Step-Down Regulator

www.DataSheet4U.com A8499 High Voltage Step-Down Regulator Features and Benefits ▪ ▪ ▪ ▪ ▪ 8 to 50 V input range Integrated DMOS switch Adjustable fixed off-time Highly efficient Adjustable 1.2 to 24 V output Description The A8499 is a step down regulator that will handle a wide input operating voltage range. The A8499 is supplied in a low-profile 8-lead SOIC with exposed pad (package LJ). Applications include: ▪ Printer power supplies ▪ Consumer equipment power supplies Package: 8-Lead SOIC with exposed thermal pad (suffix LJ) Approximate Scale 1:1 Typical Application +42 V Efficiency vs. Output Current CBOOT 0.01 μF C3 100 μF 50 V BOOT VIN C3 0.22 μF ENB LX A8499 TSET RTSET L1 47 μH VOUT 3.3 V / 1.2 A VBIAS R1 17.8 kΩ 121 kΩ GND FB D1 ESR COUT 220 μF 10 V 90.0 88.0 86.0 84.0 82.0 80.0 78.0 76.0 74.0 72.0 70.0 0 200 400 600 800 1000 Efficiency % VOUT (V) 3.3 5 1200 1400 R2 10.2 kΩ IOUT (mA) Circuit for 42 V step down to 3.3 V at 1.2 A. Efficiency data from circuit shown in left panel.Data is for reference only. A8499-DS, Rev. 3 A8499 High Voltage Step-Down Regulator Functional Block Diagram BOOT Boot Charge VIN + VIN – LX D1 L1 ESR COUT µC ENB Switch Disable Switch PWM VOUT Clamp TSET + I_Peak – I_Demand – + FB COMP GND Bias Supply VBIAS VBIAS is connected to VOUT when VOUT target is between 3.3 and 5 V UVLO TSD Soft Start Ramp Generation 1.2 V Absolute Maximum Ratings Supply Voltage, VIN .


2007-02-05 : 2SC1623    2SC2371    2SC5787    2SK246    30DF1    30DF2    A8499    AMIS-14935    AT76C111    AZ934   


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