MAX1705

19-1198; Rev 0; 4/97 1- to 3-Cell, High-Current, Low-Noise, Step-Up DC-DC Converters with Linear Regulator _______________General Description The MAX1705/MAX1706 are high-efficiency, low-noise, step-up DC-DC converters with an auxiliary linearregulator output. These devices are intended for use in battery-powered wireless applications. They use a synchronous rectifier pulse-width-modulation (PWM) boost topology to generate 2.5V to 5.5V outputs from battery inputs, such as 1 to 3 NiCd/NiMH cells or 1 Li-Ion cell. The MAX1705 has an internal 1A N-channel MOSFET switch. The MAX1706 has a 0.5A switch. Both devices also have a built-in low-dropout linear regulator that delivers up to 200mA. With an internal synchronous rectifier, the MAX1705/ MAX1706 deliver 5% better efficiency than similar nonsynchronous converters. They also feature a pulsefrequency-modulation (PFM) standby mode to improve efficiency at light loads, and a 1µA shutdown mode. An efficiency-enhancing track mode reduces the step-up DC-DC converter output to 300mV above the linear-regulator output. Both devices come in a 16-pin QSOP package, which occupies the same space as an 8-pin SO. Other features include two shutdown-control inputs for push-on/push-off control, and an uncommitted comparator for use as a voltage monitor. ANUAL N KIT M IO T A U EVAL BLE AVAILA ____________________________Features o Up to 96% Efficiency o 1.1VIN Guaranteed Start-Up o Up to 850mA Output (MAX1705) o Step-Up Output (2.5V to 5.5V a...