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MAX77827 Switch Buck-Boost Converter with 6 µA IQ

Maxim's high-efficiency, 5.5 V input, 1.8 A/3.1 A converter is designed to improve battery lifetime

Image of Maxim's MAX77827 Evaluation BoardMaxim's MAX77827 is a high-efficiency buck-boost regulator targeted for 1-cell Li-Ion powered applications with an ultra-low quiescent current of 6 μA. The device supports input voltages of 1.8 V to 5.5 V and an output voltage range of 2.3 V to 5.3 V. The buck-boost regulator provides two different switching current levels (1.8 A and 3.1 A) to optimize external component sizing based on the given load current requirements. With the 1.8 A switching current-limit option, the MAX77827 can support up to 1.0 A load current in buck-mode and 900 mA in boost-mode (VIN = 3.0 V, VOUT = 3.3 V).

The MAX77827 offers a peak efficiency of 96% making it an ideal DC/DC converter solution to supply a rail for battery-powered portable applications. The regulator features an adjustable output voltage which can be programmed from 2.3 V to 5.3 V through a single resistor. Two GPIO pins are available to support forced PWM (FPWM) enable functionality and a power-OK (POK) indicator. A control algorithm allows high-efficiency, outstanding line/load transient response, and a seamless transition between buck and boost modes. These features provide design flexibility allowing the MAX77827 to cover a wide range of applications and use cases while minimizing board space.

Mobile Power Selector Guide

Power Management for the Smart Building

Power Management for the Smart Factory

Features
  • Input voltage range: 1.8 V to 5.5 V
  • Single resistor adjustable output voltage: 2.3 V to 5.3 V
  • Max output current: 1.6 A (3.1 A ILIM option and buck-mode)
  • Max output current: 900 mA (1.8 A ILIM option, boost-mode: 3.0 VIN, and 3.3 VOUT)
  • Peak efficiency: 96% (3.3 VIN and 3.3 VOUT)
  • Skip-mode for higher light-load efficiency
  • Ultra-low typ. quiescent current: 6 µA (+25°C TJ)
  • Nominal switching frequency: 2.5 MHz
  • Enable pin
  • GPIO pins for system design convenience:
    • FPWM mode selection pin
    • POK indicator pin
  • UVLO, soft-start, active-output discharge, overcurrent, and thermal shutdown protections
  • Package: 1.61 mm x 2.01 mm, 12-bump WLP
Applications
  • 1-cell Li+ battery-powered equipment
  • Smartphones, portables, and wearables
  • Internet of Things (IoT) devices
  • NB-IoT devices

MAX77827 Buck-Boost Converter

ImageManufacturer Part NumberDescriptionFunctionOutput ConfigurationOutput TypeAvailable QuantityView Details
IC REG BUCK BST 1.8A 12WLPMAX77827BEWC+IC REG BUCK BST 1.8A 12WLPStep-Up/Step-DownPositiveAdjustable413 - ImmediateView Details

Evaluation Board

ImageManufacturer Part NumberDescriptionMain PurposeOutputs and TypeVoltage - OutputAvailable QuantityView Details
EVAL MAX77827 BUCK BST 1.8AMAX77827EVKIT#EVAL MAX77827 BUCK BST 1.8ADC/DC, Step Up or Down1, Non-Isolated3.3V0View Details
Published: 2019-06-26