LDS8724【PDF 1/10 页】IC LED DRIVER PWM 25MA 8TDFN

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LDS8724

45 WLED Driver with Boost Converter

FEATURES

? High efficiency boost converter with the input

voltage range from 2.7 to 5.5 V

? No external Schottky Required (Internal

synchronous rectifier*)

? 250 mV current sense voltage

? Drives up to 5 LEDs per string with up to 45

The LDS8724 has thermal shutdown set at 150 C.

temperature drops below 130 C.

LED in 9 strings at 25 mA

? 1 MHz Switching Frequency

? Efficiency greater than 83%

? PWM LED Dimming Control Mode

? Over-voltage, under-voltage, over-current,

and over-temperature protection

? Low Shutdown Current (<1μA)

? Available in 2 x 3 x 0.8 mm 8-pin TDFN

package

APPLICATION

resistance. Under-voltage protection disables the part

when V IN voltage reaches 2.0 V

Above this value , the boost converter stops

switching. The part resumes normal operations when

The over-current protection provides cycle-by-cycle

current limit.

The internal output over-voltage protection prevents

damage in the case of a faulty LED disconnect.

Color Display Backlight

Portable Navigation and GPS Receivers

Smart phones

Digital Photo Frames

Portable DVD Players, Notebooks

The PWM control ensures brightness adjustment with

a frequency from 100 Hz up to 30 KHz.

The EN/PWM logic input functions as a chip enable

and LED current PWM contol pin.

The device is available in 8-pin TDFN 2 x 3 mm

DESCRIPTION

package with a max height of 0.8 mm.

Table 1 Matrix configuration for LDS8724

The LDS8724 is a fixed frequency current mode

boost converter with internal synchronous rectifier

and cycle-by-cycle switch current limit specifically

designed to drive matrix of LEDs in respect with the

Table 1. Operation at 1 MHz allows use of small

value low profile inductor (10 – 33 μH) and 1 μF 50 V

ceramic capacitor.

The use of integrated synchronous rectifier makes

the efficiency dependent on only inductor DC

Number of

strings

1-6

7, 8

Number of

LED per string

String

Current

max, mA,

V IN MIN ,

2.7

3.0

2.7

3.0

TYPICAL APPLICATION CIRCUIT

*) Patent pending

? 2010 IXYS Corp.

Characteristics subject to change without notice

Doc. No. 8724DS, Rev. N1.0

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