LDS8161 datasheet(1/22 Pages) IXYS

Part #	LDS8161

Description	6-Channel / 4-Channel High-Side Linear WLED Driver

PDF	22 Pages

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Manufacturer	IXYS [IXYS Corporation]

Direct Link	http://www.ixys.com

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LDS8161/41

6-Channel / 4-Channel High-Side Linear WLED Driver

with LED Temperature Compensation Using LED-Sense

TM, I2C, and Digital PWM

FEATURES

 Six (8161) / or Four (8141) Power-Lite

TM

Linear LDO

current regulators with 50 mV dropout in a high-

side driver topology.

 High temperature LED current de-rating using the

LED-Sense

TM

temperature compensation

algorithm, which directly monitors an LED PN

junction. No external temperature sensor is

required.

 I

2

C compatible serial programming interface

 LED current programmable via I

2

C from 0 to

~32 mA in 256 linear steps. Three (8161) or two

(8141) separately controlled driver banks with 2

LED drivers each

 Integrated PWM generator for LED dimming with

12-bit

resolution

and

256

I

2 C-programmable

logarithmic duty cycle steps from 0% to 100%

(~0.17 dB per step)

 Total combined dimming range of > 16,384:1

 Power efficiency up to 98%; average efficiency

> 80% in Li-ion battery applications

 Low current shutdown mode ( < 1 µA );

 Soft start and current limiting

 LED Short circuit detection and protection, LED

open detection

 Thermal shutdown protection

 Low EMI.

 Available in 3 mm x 3 mm x 0.8 mm 16-pin TQFN

package

APPLICATIONS

 Keypad and Display Backlight

 Cellular Phone

 PDAs and Smartphones

DESCRIPTION

The LDS8161 is a 6-channel and the LDS8141 is a 4-

channel linear LED driver for WLED applications. It

includes ultra low dropout LDO current regulators at a

maximum 31.875 mA per channel in a common

cathode high side driver topology.

The LDS8161/LDS8141 has an average efficiency of

> 80% in Li-ion battery applications. It includes three

(LDS8161) or two (LDS8141) 8-bit current setting

DACs (one per bank) allowing LED currents to be

programmed via an I

2C-compatible serial interface

from 0 to 31.875 mA in 256 steps of 125

A per step.

The LDO drivers have a low dropout voltage of

50 mV typically at maximum rated current. This

provides a low power/low EMI solution in Li-ion

battery applications without voltage boosting and

associated external capacitors and components.

High temperature current de-rating insures LED

reliability and provides automatic adjustment of LED

current

to

achieve

maximum

specified

LED

brightness across the ambient temperature range.

The

proprietary

LED-Sense

TM

temperature

compensation algorithm directly monitors the ju nction

temperature of an LED and applies current de-rating

per a user loadable LUT (look up table) in 5ºC steps.

No external temperature sensing device is needed.

An integrated 12-bit PWM generator with “smooth”

logarithmic control supports LED dimming and high

temperature current de-rating. The PWM duty cycle is

programmable via the I

2C serial interface from 0% to

100%. User programmed 8-bit codes are converted

to 12-bit resolution logarithmic steps of ~ 0.17 dB per

step. The PWM frequency is ~280 Hz to minimize

noise generation.

The EN logic input functions as a chip enable. A logic

HIGH

applied

at

the

EN

allows

the

LDS8161/LDS8141

to

respond

to

I

2C

communications. An external serial interface address

pin is available for use in multi-target applications.

The device operates from 2.5V to 5.5V.

The LDS8160 is available in a 3 x 3 x 0.8 mm

3

16-lead TQFN package.

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LDS8161 Datasheet(PDF) 1 Page - IXYS Corporation

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