General Description

The MAX5096/MAX5097 easy-to-use, Dual Mode™, DC-DC converters operate as LDO (low dropout) or switch-mode buck converters. At a high output load, the converters operate as high-efficiency pulse-width modulated (PWM) switch-mode converters and reduce the power dissipation. The devices switch to a low quiescent-current (IQ) LDO mode of operation at light load. During the key-off condition, the system’s microcontroller drives the LDO/BUCK input on the fly and forces the MAX5096/MAX5097 into LDO mode, thereby reducing the quiescent current significantly.

Features

● High-Efficiency Switcher Mode (Buck Mode) or Low

   Quiescent-Current Linear Regulator (LDO Mode)

   Operation

● Wide Operating Input Voltage Range

   • +5V to +40V Buck Mode

   • +4V to +40V LDO Mode

● Fixed 3.3V or 5V and Adjustable (1.24V to 11V)

   Output Voltage Versions

● 6μA (typ) Shutdown Current

● Fixed 135kHz or 330kHz Switching Frequency

● External Frequency Synchronization

● Programmable Soft-Start

● Integrated Microprocessor-Reset (RESET) Circuit

   with Programmable Timeout Period

● Thermal and Short-Circuit Protection

● -40°C to +125°C Automotive Temperature Range

● Thermally Enhanced Package Dissipates 2.6W at

   TA = +70°C (16-Pin TQFN) and 1.7W at TA = +70°C

   (20-Pin TSSOP)

Applications

● Industrial