LDS8141-002-T2【PDF 1/22 页】IC LED DRIVER WHIT BCKLGT 16WQFN

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LDS8161/41

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

with LED Temperature Compensation Using LED-Sense TM , I 2 C, and Digital PWM

FEATURES

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

Linear LDO

current regulators with 50 mV dropout in a high-

LED-Sense

temperature compensation

I C compatible serial programming interface

LED current programmable via I C from 0 to

side driver topology.

High temperature LED current de-rating using the

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

Integrated PWM generator for LED dimming with

12-bit resolution and 256 I 2 C-programmable

logarithmic duty cycle steps from 0% to 100%

The LDO drivers have a low dropout voltage of

The

proprietary

LED-Sense

temperature

(~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

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.

compensation algorithm directly monitors the junction

temperature of an LED and applies current de-rating

programmable via the I C serial interface from 0% to

LDS8161/LDS8141

respond to I C

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

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

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 pin allows the

communications. An external serial interface address

pin is available for use in multi-target applications.

The device operates from 2.5V to 5.5V.

programmed via an I C-compatible serial interface

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

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

16-lead TQFN package.

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