General Description
The MAX1729 micropower step-up/step-down DC-DC converter is ideally suited for electrically controlled birefringence (ECB) and liquid-crystal-display (LCD) bias supply generation. It provides step-up/step-down voltage conversion and reduces output ripple by using a step-up DC-DC converter followed by a linear regulator. This architecture permits a physically smaller inductor than those used in competing SEPIC and flyback topologies. This device features low quiescent current(67µA typical). A logic-controlled shutdown mode further reduces quiescent current to 0.4µA typical.

Features
♦ High-Accuracy Reference Voltage (±1%)
♦ ±11ppm/°C Output Voltage Drift
♦ On-Chip Temperature Sensor Output
♦ Accurate Voltage and Temperature Provide:
   Consistent ECB Colors
   Consistent LCD Gray-Scale Contrast
♦ +2.7V to +5.5V Input Voltage Range
♦ Output Voltage Range
    +2.5V to +16V in Internal Feedback Mode
    Programmable in External Feedback Mode
♦ Dynamic Control of the Output Voltage
♦ 67µA Supply Current
♦ 0.4µA Shutdown Current
♦ 10-Pin µMAX Package (1.09mm max height)
♦ Evaluation Kit Available (MAX1729EVKIT)