LDS8160-002-T2【PDF 1/39 页】IC LED DVR WHT/RGB BCKLGT 16WQFN

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LDS8160

Dual-Output R G B / 6-Channel WLED Driver

with LED-Sense TM Temperature & Color Compensation

FEATURES

? Six PowerLite

Linear LDO current drivers

with 25 mV drop-out in a common cathode

topology with up to 25 mA per channel

? LED current programmable from 0 to 25 mA

in 200 linear steps

? Three separately controlled driver banks (2

bit ADC; 1 C resolution with 5 C accuracy

? LED-Sense * temperature compensation

? I C serial programming interface; additional

programmable via an I C serial interface. User

The LED-Sense

temperature compensation engine

to I C communication. A serial address pin, SADD,

LED each) supports RGB LED applications.

? Integrated digital temperature sensor with 10-

0 0

algorithm continually monitors LED V-I

parameters and adjusts brightness per user

loaded PWM correction

? Three integrated PWM generators support

RGB color correction and dimming with 12-bit

resolution and 256 user programmable

logarithmic steps (~ 0.17 dB per step)

address pin allows 4 unique slave addresses.

? Power efficiency up to 98%; average

efficiency > 80% in Li-ion battery applications

? Low current shutdown mode (< 1 μA); Low

current software “standby mode” (< 5 μA)

? Soft start and current limiting

? LED Short circuit detection and protection, LED

open detection

? Thermal shutdown protection

? Low EMI.

? Available in 3 x 3 x 0.8 mm 3 16-pin TQFN or ultra

small WCSP 3 x 4 ball grid (0.4mm pitch).

APPLICATION

? Keypad and Display Backlight

? Cellular Phones

? Digital Still Cameras

? PDAs and Smartphones

DESCRIPTION

The LDS8160 is a dual-output RGB or 6-channel

white LED driver with three temperature

compensation circuits for each bank of two LED

drivers. It supports both RGB LED and WLED

backlighting and keypad in portable applications.

Three 8-bit DACs set the current level for each LED

bank (A, B, & C) from 0 to 25mA in 0.125mA steps.

Each channel contains a linear LDO current driver in

a common cathode (i.e., current source) topology.

The LDO drivers have a typical dropout voltage of

25mV at maximum rated current. This provides a low

power and low EMI solution in Li-ion battery

applications without voltage boosting and associated

external capacitors and components.

Three 12-bit PWM generators with “smooth”

logarithmic control support Temperature vs. LED

Luminosity adjustments as well, as RGB color

correction and dimming. The PWM generators are

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.

includes a multiplexed 10-bit ADC and digital

processing circuits. The algorithm continually

measures the V-I characteristics of the LEDs and an

on-chip temperature diode to determine LED junction

temperatures to within 5oC accuracy.

Three user-programmable temperature correction

tables (LUTs) store PWM adjustment codes for every

5oC increment from -35oC to 120oC. These codes

drive the PWM engine to adjust for luminosity

variations and/or high temperature current de-rating.

The three correction LUTs support independent

correction for 3-color RGB applications.

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

HIGH applied at EN allows the LDS8160 to respond

supports use in multi-target applications. The device

operates from 2.3V to 5.5V.

The LDS8160 is available in a 0.4mm pitch 12-ball

WCSP or a 3 x 3 x 0.8 mm 16-lead TQFN packages.

? 2009 IXYS Corp.

Characteristics subject to change without notice

Doc. No. 8160_DS, Rev. N1.0

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