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

Industry's Lowest IQ Buck-Boost Controller with Best in Class Transient Response

Product Details

The MAX25431 is a current-mode buck-boost controller. The device operates with input voltages from 6V 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 devices to operate in fixed-frequency, forced-PWM mode to eliminate frequency variaion and help minimize EMI. Protection features include cycle-by-cycle current limit followed by hiccup during sustained overloads, input under-voltage lockout (UVLO), out- put overvoltage protection and thermal shut- down with automatic recovery.

The MAX25431 is available in a small 4mm x 4mm 24-pin TQFN-EP SW package.

Key Features

  • 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 Solutions Size
    • Fixed 5V Output Voltage and Adjustable 3V 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
    • 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

Applications/Uses

  • Dedicated Charging Modules
  • Rear-Seat Entertainment Modules
  • USB Hubs, Breakout Boxes and Multimedia Hubs
Parametric specs for Step-Down/Up (Buck Boost) Regulator
VIN (V) (min) 2
VIN (V) (max) 40
VOUT1 (V) (min) 3
VOUT1 (V) (max) 25
IOUT1 (A) (max) 0.6
Switch Type External
Preset VOUT (V) USB-PD Negotiated
VOUT1 Tolerance (±%) 2
Output Adjust. Method Feedback Pin
Synchronous Switching Yes
Power Good Signal Yes
ICC (mA) (max) 0.55
# DC-DC Outputs 1
Alternate Topology Step-Down Step-Up
Switching Frequency (kHz) 220-2200
Design Tools EE-Sim
Package/Pins TQFN-CU/24
Oper. Temp. (°C) -40 to +125
Budgetary
Price (See Notes)
$0.65 @1k
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Simplified Block Diagram

MAX25431: Typical Application Circuit MAX25431: Typical Application Circuit Zoom icon

Technical Docs

Design & Development

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Description

The MAX25431 evaluation kit (EV kit) is a fully assembled and tested application circuit for the MAX25431 current- mode buck-boost controller IC. The EV kit is designed to deliver up to 16A (max) input current with input voltages from 6V to 36V. The voltage quality can be monitored by observing the PGOOD signal.

The IC offers a 3V to 25V OUT programmable range. Switching frequency is adjustable from 220kHz to 2.2MHz, which allows for small external components, reduced output ripple, and guarantees no AM interference. The IC comes with a spread-spectrum frequency-modulation option designed to minimize EMI-radiated emissions and a SYNCOUT function that outputs 180° out-of-phase clock.

View Details

Features

  • 6V to 36V Input Supply Range
  • Delivers Up to 16A Input Current
  • Enable Input
  • Frequency Synchronization Output
  • Voltage-Monitoring PGOOD Output
  • BIAS Voltage-Monitoring Test Point
  • Fully Assembled and Tested
  • Proven PCB Layout

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Tools & Models

EE-Sim: Design & Simulate MAX25431

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Support & Training

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Parameters

Parametric specs for Step-Down/Up (Buck Boost) Regulator
VIN (V) (min) 2
VIN (V) (max) 40
VOUT1 (V) (min) 3
VOUT1 (V) (max) 25
IOUT1 (A) (max) 0.6
Switch Type External
Preset VOUT (V) USB-PD Negotiated
VOUT1 Tolerance (±%) 2
Output Adjust. Method Feedback Pin
Synchronous Switching Yes
Power Good Signal Yes
ICC (mA) (max) 0.55
# DC-DC Outputs 1
Alternate Topology Step-Down Step-Up
Switching Frequency (kHz) 220-2200
Design Tools EE-Sim
Package/Pins TQFN-CU/24
Oper. Temp. (°C) -40 to +125
Budgetary
Price (See Notes)
$0.65 @1k

Key Features

  • 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 Solutions Size
    • Fixed 5V Output Voltage and Adjustable 3V 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
    • 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

Applications/Uses

  • Dedicated Charging Modules
  • Rear-Seat Entertainment Modules
  • USB Hubs, Breakout Boxes and Multimedia Hubs

Description

The MAX25431 is a current-mode buck-boost controller. The device operates with input voltages from 6V 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 devices to operate in fixed-frequency, forced-PWM mode to eliminate frequency variaion and help minimize EMI. Protection features include cycle-by-cycle current limit followed by hiccup during sustained overloads, input under-voltage lockout (UVLO), out- put overvoltage protection and thermal shut- down with automatic recovery.

The MAX25431 is available in a small 4mm x 4mm 24-pin TQFN-EP SW package.

Simplified Block Diagram

MAX25431: Typical Application Circuit MAX25431: 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.