Wide Input Voltage Range, High-Efficiency,

Fault-Tolerant LED Driver

A8519 and

A8519-1

2

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

Characteristic

Symbol

Notes

Rating

Unit

LEDx Pins

x = 1, 2, 3, or 4

–0.3 to 40

V

OVP Pin

–0.3 to 40

V

VIN, VOUT Pins

–0.3 to 40

V

VSENSE, GATE Pins

V

Continuous

–0.6 to 42

V

t < 50 ns

–1 to 48

V

FAULT Pin

–0.3 to 40

V

APWM, PWM, CLKOUT, COMP,

FSET, ISET, VDD Pins

–0.3 to 5.5

V

Operating Ambient Temperature

K temperature range

–40 to 125

°C

Maximum Junction Temperature

150

°C

Storage Temperature

–55 to 150

°C

2

Operation at levels beyond the ratings listed in this table may cause permanent damage to the device. The absolute maximum ratings are stress

ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the electrical characteristics table is not

implied. Exposure to absolute maximum-rated conditions for extended periods may affect device reliability.

3

The A8519 has a synchronization pin that allows boost switching

frequencies to be synchronized in the range of 260 kHz to 2.3 MHz.

The high switching frequency allows the converter to operate above

the AM radio band. The IC contains a clock output pin that allows

other converters to be synchronized to the A8519’s boost switching

frequency.

The A8519 employs hysteresis control to help regulate the LED

current at extremely short PWM on-time. The A8519-1 is identical

to the A8519, except that it uses a smaller hysteresis window to

reduce output voltage ripple during PWM dimming.

• Excellent input voltage transient response at lowest PWM duty

cycle

• Gate driver for optional P-channel MOSFET input disconnect

switch

• LED current accuracy 0.7%

• LED string current-matching accuracy 0.8%

• Protection against:

ƒ

Shorted boost switch, inductor or output capacitor

ƒ

Shorted FSET or ISET resistor

ƒ

Open or shorted LED pins and LED strings

ƒ

Open boost diode

ƒ

Overtemperature

FEATURES AND BENEFITS (continued)

DESCRIPTION (continued)

SELECTION GUIDE

Part Number

Operating Ambient

Temperature Range

Hysteresis

Window

Package

Leadframe

Plating

A8519KLPTR-T

–40 to 125

350 mV

20-pin TSSOP with exposed thermal pad

4000 pieces per reel

100% matte tin

A8519KETTR-R

–40 to 125

350 mV

28-pin 5 × 5 mm QFN with exposed ther-

mal pad and sidewall plated

1500 pieces per reel

100% matte tin

A8519KLPTR-T-1

–40 to 125

150 mV

20-pin TSSOP with exposed thermal pad

4000 pieces per reel

100% matte tin

A8519KETTR-R-1

–40 to 125

150 mV

28-pin 5 × 5 mm QFN with exposed ther-

mal pad and sidewall plated

1500 pieces per reel

100% matte tin

1

Contact Allegro for additional packing options.