A8483EEKTR-T Allegro Microsystems Inc, A8483EEKTR-T Datasheet

A8483EEKTR-T

Manufacturer Part Number

A8483EEKTR-T

Description

IC,SMPS CONTROLLER,CURRENT-MODE,LLCC,6PIN,PLASTIC

Manufacturer

Allegro Microsystems Inc

Type

Step-Up (Boost)r

Datasheet

1.A8483EEKTR-T.pdf (9 pages)

Specifications of A8483EEKTR-T

Rohs Compliant

YES

Internal Switch(s)

Yes

Synchronous Rectifier

Number Of Outputs

Voltage - Output

Adj to 35V

Current - Output

350mA

Frequency - Switching

1.2MHz

Voltage - Input

2.5 ~ 10 V

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

5-WDFN Exposed Pad

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Power - Output

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Other names

620-1101-2

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

A8483EEKTR-T

Manufacturer:

BUSSMAN

Quantity:

2 000

Current page: 1 of 9
Download datasheet (329Kb)

Package EK:

Approximate Scale 1:1

FEATURES

Figure 1. OLED Bias Supply. Use for cell phones, MP3

players, DSCs, and PDAs.

Figure 3. LCD TV, Plasma TV Bias, FED Display,

Varactor Diode Bias. Using 5 V input.

Figure 5. WLED Backlighting.

A8483-DS, Rev. 1

Li-ion

2.5 V to

5.5 V

Li-ion

2.5 V to

5.5 V

5 V

SUPPLY

Output voltage up to 35 V

2.5 to 10 V input

0.9 to 18 V input with separate bias supply

Delivers 15 V at 15 mA with 2.7 V input

Constant 1.2 MHz switching frequency provides low noise

350 mA switch current limit

1 μA shutdown current

Low-noise PWM/analog dimming

MLP/TDFN, 3 × 3 mm

0.75 mm Nominal Height

1 µF

VIN

Enable

VIN

Enable

A8483

10 µH

GND

A8483

10 µH

GND

0.01 µF

5 kΩ

820 kΩ

39 kΩ

OUT

47 Ω

768 kΩ for

604 kΩ for

24 kΩ

15 kΩ

OUT

= 32 V

= 25 V

1 µF

0.22 µF

Analog Voltage or

PWM

32 V, 18 mA

25 V, 25 mA

1 µF / 50 V

A8483

1.2 MHz Step-up Converter

The A8483 is a current mode step-up dc-to-dc converter,

for Display Bias Supply

MLP/TDFN lead (Pb) free package. Smaller external

APPLICATIONS

Figure 2. Small LCD Bias Supply. Li+ battery to ±12 V.

Figure 4. LCD TV, Plasma TV Bias, FED Display,

Varactor Diode Bias. Using 12 V input.

Figure 6. OLED Bias Supply. Use for low-noise PWM

dimming, or with analog voltage through the FB pin.

available in a 5-pin 3 mm × 3 mm thermally enhanced

components and integrated 36 V switch reduce component

count and footprint for a variety of applications.

12 V

Li-ion

2.5 V to

5.5 V

Li-ion

2.5 V to

5.5 V

SUPPLY

OLED bias supply / WLED backlight

Portable battery-powered equipment

Cellular phones

PDAs (Personal Digital Assistant)

Camcorders, personal stereos, MP3 players, cameras

Mobile GPS systems

Connect either V

1 µF

VIN

5 V

VIN

Enable

BIAS

7.5 V

Analog Voltage or

PWM 10 kHz

or V

0.1 µF

10 µH

A8483

10 µH

GND

BIAS

VIN

Enable

160 kΩ

A8483

22 µH

GND

732 kΩ

39 kΩ

560 kΩ

47 kΩ

OUT

Cf for PWM dimming only

0.47 µF

1 nF

OUT

1 µF

768 kΩ for

604 kΩ for

15 kΩ

OUT

= 32 V

= 25 V

OUT1

0.47 µF

+ I

OUT2

32 V, 40 mA

25 V, 80 mA

0.47 µF

1 µF / 50 V

= 15 mA

+12 V

–12 V

OUT1

OUT2

Related parts for A8483EEKTR-T

A8483EEKTR-T Summary of contents

Page 1

Package EK: MLP/TDFN, 3 × 0.75 mm Nominal Height Approximate Scale 1:1 FEATURES Output voltage 2 input 0 input with separate bias supply Delivers ...

Page 2

A8483 1.2 MHz Step-up Converter for Display Bias Supply 615 mV VIN V REF 1. Enable Terminal List Table Pin Name GND VIN Ab so lute Max i mum Rat ...

A8483 1.2 MHz Step-up Converter for Display Bias Supply ELECTRICAL CHARACTERISTICS Characteristics Input Voltage Range Supply Current Feedback Reference Voltage Feedback Input Current Switch Current Limit Switch Frequency Switch Maximum Duty Cycle Switch Saturation voltage Switch Leakage Current Enable Input ...

Page 4

A8483 1.2 MHz Step-up Converter for Display Bias Supply Pin Functions VIN. Supply to the control circuit. A bypass capacitor, C1, must be connected from close to this pin to GND. GND. Ground reference connected directly to the ground plane. ...

Page 5

A8483 1.2 MHz Step-up Converter for Display Bias Supply Dimming Control Display dimming can be achieved by controlling the output voltage using the FB pin. The circuitry behind the FB OUT pin is flexible, to accommodate a variety ...

Page 6

A8483 1.2 MHz Step-up Converter for Display Bias Supply increase gradually. When the voltage drop across R3 is reduced to less than about 0.8 V, the feedback from the sense resistor, R1, takes over full control of the output voltage. ...

Page 7

A8483 1.2 MHz Step-up Converter for Display Bias Supply L1 10 µ VIN 732 kΩ SUPPLY A8483 C1 1 µF EN GND FB Li-ion 2 Enable 5 ...

Page 8

... A8483 1.2 MHz Step-up Converter for Display Bias Supply Use the following complete part number when ordering: Part Number A8483EEKTR-T Leadframe plating 100% matte-tin. Solder pad layout compatible with SOT23-5 (SOT95P280-5). Preliminary dimensions, for reference only (reference JEDEC MO-229 WEEA) Dimensions in millimeters U ...

Page 9

A8483 1.2 MHz Step-up Converter for Display Bias Supply The products described here are manufactured under one or more U.S. patents or U.S. patents pending. Allegro MicroSystems, Inc. reserves the right to make, from time to time, such de par ...

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