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10-24-2017

Extend Battery Life of USB Type-C Devices with Maxim's Flexible Buck Converter

Maxim » MAX77756

MAX77756 with integrated power MUX provides higher current load, dual input, and I2C support

Developers of multi-cell, USB Type-C™ products that need higher current, dual input, and I2C support now have a flexible option with the MAX77756 24 V, 500 mA, low quiescent current (IQ) buck converter from Maxim Integrated Products.

Maxim - MAX77756

USB Type-C products must generate an always-on 3.3 V rail to detect USB insertions. Products utilizing the Power Delivery (PD) voltage range (5 V to 20 V) can generate an always-on (1.8 V/3.3 V/5.0 V) digital supply rail for the port controller using the MAX77756 step-down converter. In addition, the MAX77756 has a 20 μA quiescent current that extends battery life by reducing idle power consumption. To simplify the system design, the MAX77756 has a dual input ideal diode ORing circuit that allows the chip to power from the external USB source if the battery is empty.

Simplified Block Diagram
Simplified Block Diagram.

Multi-cell battery-operated devices – such as ultrabooks, laptops, tablets, drones, and home automation appliances – can easily evolve to Type-C with PD using the flexible MAX77756 power supply. The MAX77756 has a unique combination of wide input voltage range, low quiescent current, higher current load, dual input, and I2C for flexibility and programmability. There is also a default power mode if customers do not want to use the I2C bus. The MAX77756 is a robust IC with short-circuit and thermal protection, 8 ms internal soft-start to minimize inrush current, proven current-mode control architecture, and up to 26 V input voltage standoff.

MAX77756 Evaluation Kit
MAX77756 Evaluation Kit.

Key Advantages

  • Low quiescent current:
    1.5 μA Buck and 20 μA MUX for always-on operation
     
  • High efficiency:
    Up to 92% with integrated power MUX
     
  • Small solution size:
    .33 mm × 1.42 mm 15-bump WLP; no external Schottky array needed
     
  • Wide input voltage:
    Operates on full VBUS range (5 V–20 V) and VBATT (2S, 3S, 4S Li+)

Availability and Pricing

  • MAX77756 is available from stock and priced at $0.65 (10,000-up, FOB USA)
     
  • MAX77756EVKIT# is available from stock and priced at $70
     
  • Start designing with MAX77756 now using the EE-Sim® Tool Suite, http://bit.ly/EE-Sim

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