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5.5V Input, 2A, High-Efficiency Buck-Boost Converter

2A High-Efficiency Buck and Boost Operating Including Seamless Transition Between Buck and Boost Mode

Product Details

The MAX77801 is a high-efficiency, step-up/step-down (buck-boost) converter targeted for single-cell, Li-ion battery-powered applications. The device maintains a regulated output voltage from 2.6V to 4.18V across an input voltage range of 2.3V to 5.5V. The device supports up to 2A of output current in boost mode and up to 3A in buck mode.

The device seamlessly transitions between buck and boost modes. A unique control algorithm allows high-efficiency and outstanding load and line-transient response. Dedicated enable and power-OK pins allow simple hardware control. An I2C serial interface is optionally used for dynamic voltage scaling, system power optimization, and fault read-back.

The MAX77801 is available in a 20-bump, 1.83mm x 2.13mm wafer-level package (WLP) and also 20-pin, 4mm x 4mm TQFN.

Key Features

  • VIN Range: 2.30V to 5.5V
  • VOUT Range: 2.60V to 4.18V (I2C Programmable in 12.5mV Steps)
  • Up to 2A Output Current in Boost Mode (VIN= 3.0V, VOUT = 3.4V)
  • Up to 3A Output Current in Buck Mode
  • Up to 97% Peak Efficiency
  • SKIP Mode for Optimal Light Load Efficiency
  • 55µA (typ) Low Quiescent Current
  • 3.4MHz High-Speed I2C Serial Interface
  • Dynamic Voltage Scaling (DVS) Function
  • Power-OK Output
  • 2.5MHz Switching Frequency
  • Protection Features
    • Soft-Start
    • Thermal Shutdown
    • Overvoltage Protection
    • Overcurrent Protection
  • 1.827mm x 2.127mm, 20-Bump WLP
  • 4mm x 4mm, 20-Pin TQFN

Applications/Uses

  • AR/VR Headsets
  • Handheld Scanners, Mobile Payment Terminals, Security Cameras
  • Single-Cell, Li-Ion Battery-Powered Devices
Parametric specs for Step-Down/Up Switching Regulators
VIN (V) (min) 2.3
VIN (V) (max) 5.5
VOUT1 (V) (min) 2.6
VOUT1 (V) (max) 4.1875
IOUT1 (A) (max) 2
Switch Type Internal
Preset VOUT (V) 3.3
3.4
VOUT1 Tolerance (±%) 1
Output Adjust. Method Preset
Synchronous Switching? Yes
Power Good Signal Yes
ICC (mA) (max) 0.07
# DC-DC Outputs 1
Alternate Topology Step-Down
Step-Up
Switching Frequency (kHz) 2500
Design Tools EE-Sim
Package/Pins TQFN-CU/20
WLP/20
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
$1.10 @1k
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Simplified Block Diagram

MAX77801: Typical Application Circuit High efficiency, high current buck boost regulator with I2C interface typical application circuit Zoom icon

Technical Docs

Design & Development

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Description

The MAX77801 evaluation kit demonstrates the IC 2A, buck-boost with I2C capability. The EV kit enables user to evaluate MAX77801 performances with preprogrammed output voltage even without I2C interface board (e.g., MINIQUSB). The two output voltages supported by default are 3.3V and 3.4V and it can be set by pulling DVS high/ low. With I2C interface board (additional order required if necessary), user can set output voltage from 2.6V to 4.1875V with 12.5mV step. The EV kit comes standard with the MAX77801EWP+ installed.

The MINIQUSB interface board can be used to enable PC communication through the USB interface board. Windows ® 2000-, Windows XP®-, Windows Vista®-, and Windows 7-compatible software along with an extender board allows an IBM-compatible PC to use to the USB port to emulate an I2C 2-wire inter-face. This menu-driven program offers a graphical user interface (GUI) with control buttons.

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Features

  • Kelvin Sense Pins at the Input and Output of the Regulator Ensure Accurate Efficiency Measurement

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Tools & Models

EE-Sim: Design & Simulate MAX77801

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Parameters

Parametric specs for Step-Down/Up Switching Regulators
VIN (V) (min) 2.3
VIN (V) (max) 5.5
VOUT1 (V) (min) 2.6
VOUT1 (V) (max) 4.1875
IOUT1 (A) (max) 2
Switch Type Internal
Preset VOUT (V) 3.3
3.4
VOUT1 Tolerance (±%) 1
Output Adjust. Method Preset
Synchronous Switching? Yes
Power Good Signal Yes
ICC (mA) (max) 0.07
# DC-DC Outputs 1
Alternate Topology Step-Down
Step-Up
Switching Frequency (kHz) 2500
Design Tools EE-Sim
Package/Pins TQFN-CU/20
WLP/20
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
$1.10 @1k

Key Features

  • VIN Range: 2.30V to 5.5V
  • VOUT Range: 2.60V to 4.18V (I2C Programmable in 12.5mV Steps)
  • Up to 2A Output Current in Boost Mode (VIN= 3.0V, VOUT = 3.4V)
  • Up to 3A Output Current in Buck Mode
  • Up to 97% Peak Efficiency
  • SKIP Mode for Optimal Light Load Efficiency
  • 55µA (typ) Low Quiescent Current
  • 3.4MHz High-Speed I2C Serial Interface
  • Dynamic Voltage Scaling (DVS) Function
  • Power-OK Output
  • 2.5MHz Switching Frequency
  • Protection Features
    • Soft-Start
    • Thermal Shutdown
    • Overvoltage Protection
    • Overcurrent Protection
  • 1.827mm x 2.127mm, 20-Bump WLP
  • 4mm x 4mm, 20-Pin TQFN

Applications/Uses

  • AR/VR Headsets
  • Handheld Scanners, Mobile Payment Terminals, Security Cameras
  • Single-Cell, Li-Ion Battery-Powered Devices

Description

The MAX77801 is a high-efficiency, step-up/step-down (buck-boost) converter targeted for single-cell, Li-ion battery-powered applications. The device maintains a regulated output voltage from 2.6V to 4.18V across an input voltage range of 2.3V to 5.5V. The device supports up to 2A of output current in boost mode and up to 3A in buck mode.

The device seamlessly transitions between buck and boost modes. A unique control algorithm allows high-efficiency and outstanding load and line-transient response. Dedicated enable and power-OK pins allow simple hardware control. An I2C serial interface is optionally used for dynamic voltage scaling, system power optimization, and fault read-back.

The MAX77801 is available in a 20-bump, 1.83mm x 2.13mm wafer-level package (WLP) and also 20-pin, 4mm x 4mm TQFN.

Simplified Block Diagram

MAX77801: Typical Application Circuit High efficiency, high current buck boost regulator with I2C interface typical application circuit Zoom icon

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