TPS61151

· 3 V to 6 V Input Voltage Range
· Two Outputs Each up to 27 V
· 0.7 A Integrated Switch
· Built-in Power Diode
· 1.2 MHz Fixed PWM Frequency
· Individually Programmable Output Current
· Input-to-Output Isolation
· Built-in Soft Start
· Overvoltage Protection
· Up to 83% Efficiency
· Up to 30 kHz PWM Dimming Frequency
· Availiable in a 10 Pin, 3 × 3 mm QFN Package

(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) All voltage values are with respect to network ground terminal.

The TPS61151 is a high frequency boost converter with two regulated current outputs for driving WLEDs. Each current output can be individually programmed through external resistors. There is dedicated selection pin for each output, so the two outputs can be turned on separately or simultaneously. The output current of TPS61151 can be reduced by a pulse width modulation (PWM) signal on the select pins or an analog voltage on the ISET pin, resulting in PWM dimming of the WLEDs. The boost regulator TPS61151 runs at 1.2 MHz fixed switching frequency to reduce output ripple and avoid audible noises associated with PFM control.

The two current outputs of TPS61151 are ideal for driving WLED backlight for the sub and main displays in clam shell phones. The two outputs can also be used for driving display and keypad backlights. When used together,the two outputs can drive up to 14 WLED for one large display.

In addition to the small inductor, small capacitor and 3 mm x 3 mm QFN package, the built-in MOSFET and diode eliminate the need for any external power devices. Overall, the IC TPS61151 provides an extremely compact solution with high efficiency and plenty of flexibility.