LP5521TMX National Semiconductor, LP5521TMX Datasheet

LP5521TMX

Manufacturer Part Number

LP5521TMX

Description

Manufacturer

National Semiconductor

Datasheets

1.LP5521YQX.pdf (14 pages)

2.LP5521TMX.pdf (14 pages)

3.LP5521TMX.pdf (42 pages)

Specifications of LP5521TMX

Date_code

10+

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Download datasheet (327Kb)

LP5521

Programmable Three Channel LED Driver

General Description

The LP5521 is a three channel LED driver designed to pro-

duce variety of lighting effects for mobile devices. High effi-

ciency charge pump enables LED driving over full Li-Ion

battery voltage range. The device has a program memory for

creating variety of lighting sequences. When program mem-

ory has been loaded, LP5521 can operate independently

without processor control.

LP5521 maintains excellent efficiency over a wide operating

range by automatically selecting proper charge pump gain

based on LED forward voltage requirements. LP5521 is able

to automatically enter power-save mode, when LED outputs

are not active and thus lowering current consumption.

Three independent LED channels have accurate pro-

grammable current sources and PWM control. Each channel

has program memory for creating desired lighting sequences

with PWM control.

LP5521 has a flexible digital interface. Trigger I/O and 32 kHz

clock input allow synchronization between multiple devices.

Interrupt output can be used to notify processor, when LED

sequence has ended. LP5521 has four pin selectable I

dresses. This allows connecting up to four parallel devices in

one I

trol pin for other devices.

LP5521 requires only four small and low cost ceramic capac-

itors.

LP5521 is available in tiny 2.1x1.7x0.6 mm microSMD-20

package and in 4.0x5.0x0.8 mm bumped LLP-24 package.

Comprehensive application tools are available, including

command compiler for easy LED sequence programming.

Typical Application

C bus. GPO and INT pins can be used as a digital con-

201862

C ad-

Features

■

Applications

■

Adaptive charge pump with 1x and 1.5x gain provides up

to 95% LED drive efficiency

Charge pump with soft start and overcurrent/short circuit

protection

Low input ripple and EMI

Very small solution size, no inductor or resistors required

200 nA typical shutdown current

Automatic power save mode

Independently programmable constant current outputs

with 8-bit current setting and 8-bit PWM control

Typical LED output saturation voltage 50 mV and current

matching 1%

Three program execution engines with flexible instruction

set

Autonomous operation without external control

Large SRAM program memory

Two general purpose digital outputs

microSMD-20 package, 0.4 mm pitch

Bumped LLP-24 package, 0.5 mm pitch

Fun / indicator lights

LCD sub-display backlighting

Keypad RGB backlighting and phone cosmetics

Vibra, speakers, waveform generator

C compatible interface

20186270

www.national.com

June 2007

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