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5.5V Input, 4.4A/3.6A Switching Current 6μA IQ Buck-Boost Converter

4.4A Buck-Boost Converter with Lowest IQ

Product Details

Parametric specs for Step-Down/Up Switching Regulators
VIN (V) (min) 1.8
VIN (V) (max) 5.5
VOUT1 (V) (min) 2.3
VOUT1 (V) (max) 5.3
IOUT1 (A) (max) 2.5
Switch Type Internal
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Alternate Topology Buck-Boost
Step-Up/Down
Design Tools EE-Sim
Package/Pins WLP HC/15
Oper. Temp. (°C) -40 to +125
Budgetary
Price (See Notes)
0.68
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Down/Up Switching Regulators
VIN (V) (min) 1.8
VIN (V) (max) 5.5
VOUT1 (V) (min) 2.3
VOUT1 (V) (max) 5.3
IOUT1 (A) (max) 2.5
Switch Type Internal
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Alternate Topology Buck-Boost
Step-Up/Down
Design Tools generateDesignEESIMUrl('http://maxim.transim.com/pwm2/designreq/Index?partId=25864', '')
Package/Pins WLP HC/15
Oper. Temp. (°C) -40 to +125
Budgetary
Price (See Notes)
0.68

Key Features

  • Flexible System Integration
    • 1.8V to 5.5V Input Voltage Range
    • 2.3V to 5.3V Single Resistor Adjustable Output
    • 3.6A ILIM ("C" and "D" options) or 4.4A ILIM ("A" and "B" options)
    • 3A Maximum Output Current (4.4A ILIM, Buck Mode)
    • 3A Maximum Output Current (4.4A ILIM, Boost Mode 3.0VIN, 3.3VOUT)
    • 96% Peak Efficiency (VIN = 3.6V, VOUT = 3.3V)
    • Optional GPIO Pin (FPWM input, Active-Low POK output)
  • Low Supply Current that Extends Battery Life
    • Skip Mode that Reduces Supply Current at Light Loads
    • 6μA Ultra-Low IQ
  • 2.2MHz (typ) Switching Frequency
  • Integrated Protections that Provide System Robustness
    • Undervoltage Lockout (UVLO)
    • Overvoltage Protection (OVP)
    • Cycle-by-Cycle Inductor Peak Current Limit
    • Thermal Shutdown (TSHDN)
  • Active Output Discharge
  • Small Solution Size
    • 2.07mm x 1.51mm, 0.4mm Pitch, 15-Bump WLP
    • 2.5mm x 2.0mm, 0.5mm Pitch, 11-Pin FC2QFN

Applications/Uses

  • Asset Tracking/Fleet Management
  • 5G/2G/GSM Cellular Power
  • RF Amplifier
  • Smartphones ToF/Facial and Gesture Recognition
  • System Power Pre-Regulation
  • Single-Cell Li-ion Battery Powered Devices

Description

The MAX77839 is a highly-efficient buck-boost regulator with an industry leading quiescent current of 6μA targeted for one-cell Li-ion and down to any battery chemistry with 1.8V discharge voltage. It supports input voltages of 1.8V to 5.5V and an output voltage range of 2.3V to 5.3V. The IC provides two different switching current limits to optimize external component sizing based on given load current requirements. The MAX77839 supports two different switching current options ("A" and "B" =  4.4A (typ), "C" and "D" = 3.6A (typ)), and two different GPIO pin configurations ("A" and "C" = FPWM pin,"B" and "D" = POK pin). These options provide design flexibility that allow the IC to cover a wide range of applications and use cases while minimizing board space.

The IC features a single-resistor adjustable output voltage from 2.3V to 5.3V. A configurable GPIO pin allows to select either a FPWM mode control input or an active-low POK open drain output, depending on the system requirements. Maxim's unique buck-boost controller technology provides high efficiency, excellent load and line transient response, and a seamless transition between buck and boost modes of operation.

The MAX77839 is available in either a 2.07mm x 1.51mm, 15-bump wafer-level package (WLP), and a 2.5mm x 2.0mm, 11-lead FC2QFN package.

Simplified Block Diagram

Technical Docs

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 .