CSP-12

QFN-10

1

FEATURES

DESCRIPTION

APPLICATIONS

VOUT

AVIN

SW

C

IN

SW

LED

PGND

PGND

P

P

P

AGND

Tx-TOFF

MODE0

MODE1

FLASH_SYNC

L

P

TPS61054

2.2 H

m

C

10 F

OUT

m

+BATTERY

LED ANODE

PGND

INDUCTOR

C1

L1

C2

LED

SENSE

4.7mm

PGND

TPS61054, TPS61055

HIGH POWER WHITE LED DRIVER

2-MHz SYNCHRONOUS BOOST CONVERTER WITH STANDARD LOGIC INTERFACE

2

• Four Operational Modes

–

The

TPS6105x

device

uses

a

high-frequency

synchronous-boost topology with constant current

–

Voltage-Regulated Boost Converter: 5.0 V

sink to drive single white LEDs. The device uses an

–

Shutdown: 0.3

µA (typ)

inductive fixed-frequency PWM control scheme using

small external components, minimizing input ripple

current.

• Up to 96% Efficiency

• Integrated LED Turn-On Safety Timer

The 2-MHz switching frequency allows the use of

small and low-profile 2.2-

µH inductors. To optimize

• Zero Latency TX-Masking Input

overall efficiency, the device operates with only a

• Integrated Low Light Dimming Mode

250-mV LED feedback voltage.

• LED Disconnect During Shutdown

The TPS6105x device not only operates as a

• Open/Shorted LED Protection

regulated current source, but also as a standard

• Over-Temperature Protection

voltage-boost regulator. This additional operating

mode can be useful to supply other high-power

• Available in a 12-Pin NanoFree™ (CSP) and

devices in the system, such as a hands-free audio

10-Pin QFN Packaging

power amplifier, or any other component requiring a

supply voltage higher than the battery voltage.

The LED current or the desired output voltage can be

• Camera White LED Torch/Flash for Cell

programmed via two logic signals (MODE0/1). To

Phones, Smart-Phones and PDAs

simplify

flash

synchronization

with

the

camera

• General Lighting Applications

module,

the

device

offers

a

trigger

pin

• Audio Amplifier Power Supply

(FLASH_SYNC) for fast LED turn-on time.

When the TPS6105x is not in use, it can be put into

shutdown mode, reducing the input current to 0.3

µA

(typ).

During

shutdown,

the

LED

pin

is

high

impedance to avoid leakage current through the LED.

Figure 1. Typical Application

Figure 2. Typical PC-Board Layout

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

NanoFree, PowerPAD are trademarks of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2007–2008, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.