DESCRIPTION
The MAX1642/MAX1643 are high-efficiency, low-voltage, step-up DC-DC converters intended for devices powered by a single alkaline cell. They feature low quiescent supply currents and are supplied in the ultra-small µMAX package, which is only 1.1mm high. The guaranteed start-up voltage is 0.88V. Each device consists of an internal 1 Ω , N-channel MOSFET power switch; a built-in synchronous rectifier that acts as the catch diode; an oscillator; a reference; and pulse-frequency-modulation (PFM) control circuitry. Both devices feature an independent undervoltage comparator (PFI/PFO). The MAX1642 also includes a 2µA logic-controlled shutdown mode. MAX1642/MAX1643 ______________Ordering Information PART MAX1642C/D MAX1642EUA MAX1643C/D MAX1643EUA TEMP. RANGE 0°C to +70°C -40°C to +85°C 0°C to +70°C -40°C to +85°C PIN-PACKAGE Dice* 8 µMAX Dice* 8 µMAX ________________________Applications Pagers Remote Controls Pointing Devices Personal Medical Monitors Single-Cell Battery-Powered Devices *Dice are tested at TA = +25°C.
Maxim Integrated
