SW

GND_SW

MAIN

GND_WLED

SUB

GND_RGB

RLED

GLED

BLED

FB

VDD1

D

A

8-Bit

IDAC

8-Bit

IDAC

MCU

SCL

SDA

LDO

BIAS

REF

THSD

POR

OSC

I

BRIGHTNESS

CONTROL

CONTROL

BG

BOOST

PWM

NRST

VDDIO

IRGB

IRT

VDDA

VREF

VDD2

Logic supply

GND

GPIO[0]/PWM

GPIO[1]

GPIO[2]

D

A

Li-Ion

Battery

or

Charger

= 150 mA

= 8V...20 V

10 é

F

L1

10 PH

SUB

BACKLIGHT

0...25 mA/LED

MAIN

BACKLIGHT

0...25 mA/LED

100 nF

D1

100 nF

100 nF

1 PF

2 x 4.7 éF

100 pF

390:

Optional EMI FILTER,

close to SW pin

FLASH

0...150mA

82k:

LP5526

SNVS431C – FEBRUARY 2006 – REVISED JULY 2009

www.ti.com

Electrical Characteristics

(1) (2)

82k

Ω.

(3)

Symbol

Parameter

Condition

Min

Typ

Max

Units

Standby supply current

NSTBY = L

1.7

7

µA

Register 0DH=08H

(4)

No-boost supply current

NSTBY = H,

300

800

µA

EN_BOOST = L

No-load supply current

NSTBY = H, EN_BOOST = H

780

1300

uA

Autoload OFF

2.80

V

-3

+3

%

1.23

V

(1)

All voltages are with respect to the potential at the GND pins.

(2)

Min and Max limits are guaranteed by design, test, or statistical analysis. Typical numbers are not guaranteed, but do represent the

most likely norm.

(3)

Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics.

(4)

Boost output voltage set to 8V (08H in register 0DH) to prevent any unnecessary current consumption.

(5)

Block Diagram

6

Submit Documentation Feedback

Copyright © 2006–2009, Texas Instruments Incorporated

Product Folder Links: LP5526