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A8507

LED Backlight Driver for LCD Monitors and Televisions

Allegro MicroSystems 

A8507

LED Backlight Driver for LCD Monitors and Televisions

ELECTRICAL CHARACTERISTICS Valid at VIN = 5 V; TA = 25°C, RFSET = 52 kΩ, RISET = 12.4 kΩ, except indicates

specifications guaranteed over the full operating temperature range with TA = TJ , unless otherwise noted

Characteristics

Symbol

Test Conditions

Min. Typ.1 Max.

Input Voltage Range

VIN

4.3 – 5.5

Undervoltage Lockout Threshold

Undervoltage Lockout Hysteresis

VUVLO

VUVLOHYS

VIN Falling

Switching at no load

–

– 4.0

– 0.1 –

–

7

–

Supply Current2

IVIN

Shutdown, EN = VIL, TA = 25°C

Standby, EN = VIH, PWM = VIL, soft start

completed

– 0.1 1

–

1

2

Boost Controller

Switching Frequency

Minimum Switch Off-Time

Minimum Switch On-Time

Logic Input Levels (EN and PWM pins)

fSW

toff(min)

ton(min)

Driver output

Driver output

0.8 1 1.25

–

72

–

–

72

–

Input Voltage Level Low

Input Voltage Level High

Input Leakage Current2

Driver Section

VIL

VIH

IIN

EN = PWM = 5 V

–

– 0.4

1.5 –

–

– 100 –

High Side Gate Drive On Resistance

Low Side Gate Drive On Resistance

Driver to GND Resistance During Shutdown

Sense Overcurrent Threshold Voltage

LED Current Sinks

RDS(on)H

RDS(on)L

RSDOFF

VSEN

Measured at VGATE = VIN / 2

Measured at VGATE = VIN / 2

VSENP – VSENN

–

9

–

–

10

–

– 125 –

80 95 110

LEDx Pin Regulation Voltage

ISET to ILEDx Current Gain

ISET Pin Voltage

ISET Allowable Current Range2

LEDx Accuracy3

LEDx Matching4

LEDx Switch Leakage Current2

Soft Start

VLEDx

AISET

VISET

ISET

ErrILEDX

ΔILEDX

ISL

ILED = 80 mA

ISET = 100 μA

LED1 through LED6 = 1 V, at 100% Current

LED1 through LED6 = 1 V, ISET = 100 μA

VLEDx = 12 V, EN = 0

–

1

–

– 640 –

– 1.235 –

41

– 125

–3 ±0.6 3

–3 ±0.6 3

– 0.1 –

Soft Start Sense Threshold Voltage

VSENS

Sense voltage for boost switch current

sensing

– 28.5 –

Soft Start LEDx Current Limit Relative to LED

100% Current

ILED(SS)

Current through enabled LEDx pins during

soft start

–

8

–

Unit

V

V

V

mA

μA

mA

MHz

ns

ns

V

V

μA

Ω

Ω

kΩ

mV

V

A/A

V

μA

%

%

μA

mV

%

Continued on the next page…

Allegro MicroSystems, Inc.

4

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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