DESCRIPTION

The ZXLB1600 inductive switching boost converter accepts an input voltage of between 1.6V and 5.5V and provides an adjustable output voltage of up to 28V for LCD and OLED bias. The device contains an output switch and a second switch to isolate the coil from the input to provide true isolation in shutdown mode. The output can be adjusted by means of an externally applied dc voltage, a PWM control signal, or external feedback resistors and can supply typically 10mA of output current at maximum output voltage. Higher current is available at lower output voltages.

FEATURES

• Wide input voltage range: 1.6 to 5.5V
• Adjustable output voltage up to 28V, using PWM or analog control voltage
• Internal PWM filter
• True shutdown (output isolated from input)
• Internal output switch and current sense
• Low quiescent current: (75μA max)
• 5μA (max) shutdown current (including low battery comparator)
• Up to 500kHz switching frequency
• High efficiency
• Small MSOP10 package
• Low external component count

APPLICATIONS

• PDAs
• Mobile phones - OLED sub displays
• Digital cameras
• Portable internet appliances
• Palmtop computers
• GPS terminals