1 Features

1• 2.7-V to 5.5-V Input Voltage Range

• 28-V Open LED Protection (up to 8 LEDs)

• Integrated 0.6-A, 30-V Internal Switch FET and

Power Diode

• 750-kHz Switching Frequency

• Flexible Digital and PWM Brightness Control

– 1-Wire Control Interface (EasyScale™)

– PWM Dimming Control Interface

• Up to 100:1 PWM Dimming Ratio

• Integrated Loop Compensation

• Built-in Soft Start

• Built-in WLED Open protection

• Thermal Shutdown

2 Applications

• Feature Phones

• Smart Phones

• Portable Media Players

• Ultra Mobile Devices

• GPS Receivers

• Backlight for Small and Media Form Factor LCD

Displays

3 Description

With a 30V-rated integrated switch FET and power

diode, the TPS61158 is a boost converter that drives LEDs in series. The boost converter runs at 750-kHz

fixed switching frequency to reduce output ripple,

improve conversion efficiency, and allows for the use

of small external components.

The default white LED current is set with the external

sensor resistor RFB, and the feedback voltage is

regulated to 200 mV, as shown in Typical Application.

During the operation, the LED current can be

controlled using the 1-wire digital interface

(EasyScale™ protocol) through the CTRL pin.

Alternatively, a pulse width modulation (PWM) signal can be applied to the CTRL pin through which the

duty cycle determines the feedback reference

voltage. In either digital or PWM mode, the

TPS61158 does not burst the LED current; therefore,

it does not generate audible noises on the output

capacitor. For maximum protection, the device

features integrated open LED protection that disables

the TPS61158 to prevent the output voltage from

exceeding the device absolute maximum voltage

ratings during open LED conditions.