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40V, 600mA Buck Converters with Low-Quiescent-Current Linear Regulator Mode

Industry's First Automotive Buck Converter with Low IQ LDO Mode Operates Seamlessly from 4V Cold Crank to 40V Input

Product Details

Key Features

Applications/Uses

Simplified Block Diagram

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Key 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 (Active-Low 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)
    • 1.7W at TA = +70°C (20-Pin TSSOP)

Applications/Uses

  • Home Security/Safety

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/active-low BUCK input on the fly and forces the MAX5096/MAX5097 into LDO Mode, thereby reducing the quiescent current significantly.

In Buck Mode, the MAX5096/MAX5097 operate from a 5V to 40V input voltage range and deliver up to 600mA of load current with excellent load and line regulation. The fixed-switching frequency versions of 135kHz and 330kHz are available. The MAX5096/MAX5097 DC-DC internal oscillator can be synchronized to an external clock. External compensation and a current-mode control scheme make it easy to design with.

In LDO Mode, the MAX5096/MAX5097 operate from a 4V to 40V input voltage. The LDO Mode operation is intended for a lower output load current of up to 100mA. The quiescent current at 100µA load in LDO Mode is only 41µA (typ).

The MAX5096/MAX5097 feature an enable input that shuts down the device, reducing the current consumption to 6µA (typ). Additional features include a power-on reset output with a capacitor-adjustable timeout period, programmable soft-start, output tracking, output overload, short-circuit and thermal shutdown protections.

The MAX5096/MAX5097 operate over the -40°C to +125°C automotive temperature range and are available in thermally enhanced 20-pin TSSOP or 16-pin TQFN packages.

Simplified Block Diagram

MAX5096, MAX5097: Simplified Diagram MAX5096, MAX5097: Simplified Diagram Zoom icon

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .