A8483EEK-T

A8483EEK-T Datasheet

A8483 MHz Step-up Converter for Display Bias Supply

Part	Datasheet
A8483EEK-T	A8483EEK-T (pdf)

Related Parts	Information
A8483EEKTR-T	A8483EEKTR-T

PDF Datasheet Preview
A8483 MHz Step-up Converter for Display Bias Supply This device is in production, however, it has been deemed Pre-End of Life. The product is approaching end of life. Within a minimum of 6 months, the device will enter its final, Last Time Buy, order phase. Date of status change June 3, 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 engineer or sales representative. A8483 MHz Step-up Converter for Display Bias Supply • Output voltage up to 35 V • to 10 V input • to 18 V input with separate bias supply • Delivers 15 V at 15 mA with V input • Constant MHz switching frequency provides low noise • 350 mA switch current limit • 1 uA shutdown current • Low-noise PWM/analog dimming Package TDFN suffix EK 3 x 3 mm, mm Nominal Height Approximate Scale 1:1 TheA8483 is a current mode step-up dc-to-dc converter, available in a 5-pin 3 mm x 3 mm thermally enhanced TDFN lead Pb free package. Smaller external components and integrated 36 V switch reduce component count and footprint for a variety of applications. Applications: • OLED bias supply / WLED backlight • Portable battery-powered equipment • Cellular phones • PDAs Personal Digital Assistant • Camcorders, personal stereos, MP3 players, cameras • Mobile GPS systems 10 µH 1 VSUPPLY C1 1 µF Li-ion V to V A8483 EN GND FB 423 Enable VOUT D1 R1 820 kΩ R2 39 kΩ C2 1 µF 10 µH VSUPPLY C1 1 µF Li-ion V to V A8483 EN GND FB 423 Enable D1 R1 732 kΩ R2 39 kΩ C2 µF IOUT1 + IOUT2 = 15 mA C3 µF VOUT1 +12 V VOUT2 OLED Figure OLED Bias Supply. Use for cell phones, MP3 players, DSCs, and PDAs. VSUPPLY C1 1 µF 10 µH 1 A8483 EN GND FB 423 Selection Guide Use the following complete part number when ordering: Packing* A8483EEKTR-T 7-in. reel, 1500 pieces/reel *Contact Allegro for additional packing options. Surface Mount Functional Block Diagram VREF A1 615 mV EN Enable A2 RC Ramp Generator MHz Oscillator Driver Terminal List Table Name Function Internal power FET Ground Feedback input Enable input supply Device Pin-out Diagram SW 1 GND 2 5 VIN 4 EN Absolute Maximum Ratings SW Pin to 36 V Remaining Pins to 10 V Operating Ambient Temperature , TA to 85°C Junction Temperature, 150°C Storage Temperature, TS to 150°C Package Thermal Characteristics = 50 °C/W, on a 4-layer board. Additional information is available on the Allegro Web site. Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. A8483 MHz Step-up Converter for Display Bias Supply ELECTRICAL CHARACTERISTICS at TA = 25°C, VIN = 3 V unless otherwise noted Characteristics Test Conditions Input Voltage Range Supply Current VIN ISUP Active IOUT = 15 mA, VOUT = 12 V Shutdown EN = 0 V Feedback Reference Voltage Feedback Input Current Switch Current Limit Switch Frequency Switch Maximum Duty Cycle VFB IFB ISWLIM FSW D VFB = V Switch Saturation voltage Switch Leakage Current Enable Input VCE SAT ISL ISW = A VSW = 36 V

PDF Datasheet Preview

A8483 MHz Step-up Converter for Display Bias Supply

This device is in production, however, it has been deemed Pre-End of Life. The product is approaching end of life. Within a minimum of 6 months, the device will enter its final, Last Time Buy, order phase. Date of status change June 3, 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 engineer or sales representative.

A8483

MHz Step-up Converter for Display Bias Supply
• Output voltage up to 35 V
• to 10 V input
• to 18 V input with separate bias supply
• Delivers 15 V at 15 mA with V input
• Constant MHz switching frequency provides low noise
• 350 mA switch current limit
• 1 uA shutdown current
• Low-noise PWM/analog dimming

Package TDFN suffix EK
3 x 3 mm, mm Nominal Height

Approximate Scale 1:1

TheA8483 is a current mode step-up dc-to-dc converter, available in a 5-pin 3 mm x 3 mm thermally enhanced TDFN lead Pb free package. Smaller external components and integrated 36 V switch reduce component count and footprint for a variety of applications.

Applications:
• OLED bias supply / WLED backlight
• Portable battery-powered equipment
• Cellular phones
• PDAs Personal Digital Assistant
• Camcorders, personal stereos, MP3 players, cameras
• Mobile GPS systems
10 µH 1

VSUPPLY C1 1 µF

Li-ion V to V

A8483

EN GND FB 423 Enable

VOUT D1

R1 820 kΩ

R2 39 kΩ

C2 1 µF
10 µH

VSUPPLY C1 1 µF

Li-ion V to V

A8483

EN GND FB 423 Enable

D1 R1 732 kΩ

R2 39 kΩ

C2 µF

IOUT1 + IOUT2 = 15 mA

C3 µF

VOUT1 +12 V

VOUT2

OLED

Figure OLED Bias Supply. Use for cell phones, MP3 players, DSCs, and PDAs.

VSUPPLY C1 1 µF
10 µH 1

A8483

EN GND FB 423
Selection Guide Use the following complete part number when ordering:

Packing*

A8483EEKTR-T 7-in. reel, 1500 pieces/reel *Contact Allegro for additional packing options.

Surface Mount

Functional Block Diagram

VREF

A1 615 mV

EN Enable

A2 RC

Ramp Generator

MHz Oscillator

Driver

Terminal List Table

Name

Function Internal power FET

Ground Feedback input

Enable input supply

Device Pin-out Diagram

SW 1 GND 2
5 VIN 4 EN

Absolute Maximum Ratings

SW Pin to 36 V Remaining Pins to 10 V Operating Ambient Temperature , TA to 85°C Junction Temperature, 150°C Storage Temperature, TS to 150°C

Package Thermal Characteristics
= 50 °C/W, on a 4-layer board. Additional information is available on the Allegro Web site.

Allegro MicroSystems, LLC
115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

A8483

MHz Step-up Converter for Display Bias Supply

ELECTRICAL CHARACTERISTICS at TA = 25°C, VIN = 3 V unless otherwise noted

Characteristics

Test Conditions

Input Voltage Range Supply Current

VIN ISUP

Active IOUT = 15 mA, VOUT = 12 V Shutdown EN = 0 V

Feedback Reference Voltage Feedback Input Current Switch Current Limit Switch Frequency Switch Maximum Duty Cycle

VFB IFB ISWLIM FSW D

VFB = V

Switch Saturation voltage Switch Leakage Current Enable Input

VCE SAT ISL

ISW = A VSW = 36 V

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived A8483EEK-T Datasheet file may be downloaded here without warranties.

Datasheet ID: A8483EEK-T 516082