Automotive 40V, 55µA I, 2.2MHz, H-Bridge Buck-Boost Controller

The MAX20048 is a current‐mode buck‐boost controller. The device operates with input voltages from 4.5V to 36V while using only 55µA quiescent current at no load. Once the start‐up conditions are satisfied, the device can operate over an extended input voltage range of 2V to 36V. The switching frequency is resistor programmable from 220kHz to 2.2MHz and can be synchronized to an external clock. The device output voltage is available as 5V fixed or adjustable from 4V to 25V. The wide input voltage range, along with its ability to maintain constant output voltage during battery transients, makes the device ideal for automotive applications. In light-load applications, a logic input (FSYNC) allows the device to operate either in skip mode for reduced current consumption, or fixed‐frequency, forced‐PWM mode to eliminate frequency variation and help minimize EMI. Protection features include cycle‐by‐cycle current limit followed by hiccup during sustained overloads, input undervoltage lockout (UVLO), output overvoltage protection, and thermal shutdown with automatic recovery. The MAX20048 is available in a small 4mm x 4mm, 24-pin TQFN-EP SW package.

Applications

* Infotainment Systems

* Body Electronics

* Start-Stop Systems

* Point of Load Power Supply

* USB Power Delivery

* Meets Stringent Automotive Quality and Reliability Requirements

* Operating VIN Range: 2V to 36V Allows Operation in Cold-Crank Conditions

* Tolerates Input Transients to 40V

* EN Pin Compatible from +3.3V to +40V

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

* AEC-Q100 Qualified

* Efficient Solution in a Small Solution Size

* Skip Mode for Efficient Low-Power Operation

* Fixed 5V Output Voltage and Adjustable 4V to 25V

* High Switching Frequency Allows Use of Small External Components

* Small 4mm x 4mm, 24-Pin SWTQFN Package

* Low Quiescent Current Helps Designers Meet Stringent OEM Current Requirements

* 55µA Quiescent Current When in Standby Mode

* 10µA (max) Quiescent Current in Shutdown

* EMI Mitigation to Meet CISPR25 Class 5 Requirements

* 220kHz to 2.2MHz Operating Frequency

* Fixed-Frequency PWM Mode

* External Frequency Synchronization or SYNC OUT Capability (Selectable by OTP Option)

* Spread Spectrum Can Be Enabled or Disabled for IC by OTP Option