LDS8161 IXYS Corporation, LDS8161 Datasheet

LDS8161

Manufacturer Part Number

LDS8161

Description

6-channel / 4-channel High-side Linear Wled Driver With Led Temperature Compensation Using Led-sensetm, I 2 C, And Digital Pwm

Manufacturer

IXYS Corporation

Datasheet

1.LDS8161.pdf (22 pages)

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LDS8161/41

FEATURES

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

 High temperature LED current de-rating using the

 I

 LED current programmable via I

 Integrated PWM generator for LED dimming with

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

 Power efficiency up to 98%; average efficiency

 Low current shutdown mode ( < 1 µA );

 Soft start and current limiting

 LED Short circuit detection and protection, LED

 Thermal shutdown protection

 Low EMI.

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

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

from 0 to 31.875 mA in 256 steps of 125 A per step.

current regulators with 50 mV dropout in a high-

side driver topology.

LED-Sense

algorithm, which directly monitors an LED PN

junction. No external temperature sensor is

required.

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

(8141) separately controlled driver banks with 2

LED drivers each

12-bit

logarithmic duty cycle steps from 0% to 100%

(~0.17 dB per step)

> 80% in Li-ion battery applications

open detection

package

C compatible serial programming interface

with LED Temperature Compensation Using LED-Sense

resolution

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

temperature compensation

C-compatible serial interface

and

256

C-programmable

C from 0 to

Linear LDO

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

brightness across the ambient temperature range.

The

compensation algorithm directly monitors the junction

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

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

LDS8161/LDS8141

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

16-lead TQFN package.

proprietary

applied

achieve

the

LED-Sense

, I

C serial interface from 0% to

maximum

C, and Digital PWM

respond

specified

allows

temperature

LED

the

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