Top

2.1MHz, High-Voltage, 1A Mini-Buck Converter

1A Automotive Buck Converter Integrates High- and Low-Side FETs and Uses Only 25µA Quiescent Current

Product Details

Key Features

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 3.5
VIN (V) (max) 28
VOUT1 (V) (min) 3.3
VOUT1 (V) (max) 5
IOUT1 (A) (max) 1
Switch Type Internal
Preset VOUT (V) 5
Output Adjust. Method Preset
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 2100
Design Tools EE-Sim
Package/Pins TDFN/10
TSSOP/16
Budgetary
Price (See Notes)
3.61
View Less

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 .

Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 3.5
VIN (V) (max) 28
VOUT1 (V) (min) 3.3
VOUT1 (V) (max) 5
IOUT1 (A) (max) 1
Switch Type Internal
Preset VOUT (V) 5
Output Adjust. Method Preset
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 2100
Design Tools generateDesignEESIMUrl('http://maxim.transim.com/pwm2/designreq/Index?partId=9168', '')
Package/Pins TDFN/10
TSSOP/16
Budgetary
Price (See Notes)
3.61

Key Features

  • Meets Stringent Automotive Quality and Reliability Requirements
    • +3.5V to +28V Input Voltage Range Allows Operation in "Cold Crank" Conditions
    • Tolerates Input-Voltage Transients to +42V
    • Enable-Pin Compatible from +3.3V Logic Level to +42V
    • 1A Minimum Output Current with Overcurrent Protection
    • -40°C to +125°C Automotive Temperature Range
    • AEC-Q100 Qualified
  • Increased Efficiency and Reduced BOM Cost and Board Space
    • Integrated High- and Low-Side FETs
    • Fixed Output Voltages (see the Selector Guide in the full data sheet and Contact the Factory for All Available Trimmed Output-Voltage Options)
    • 10-Pin TDFN-EP or 16-Pin TSSOP-EP Packages
  • Low Quiescent Current Helps Designers Meet Stringent OEM Current Requirements
    • 25µA Quiescent Current During Skip Mode Operation
  • High Switching Frequency Allows Use of Small, Low-Cost External Components
    • 2.1MHz Switching Frequency with Three Modes of Operation
    • Skip Mode for Efficient, Low-Power Operation
    • Forced Fixed-Frequency Operation
    • External Frequency Synchronization
  • Reduced EMI Emissions at the Switching Frequency
    • Optional Spread-Spectrum Frequency Modulation

Applications/Uses

  • Automotive
  • High-Voltage Input-Power DC-DC Applications
  • Industrial

Description

The MAX16903 is a small, synchronous buck converter with integrated high-side and low-side switches. The device is designed to deliver 1A with input voltages from +3.5V to +28V while using only 25µA quiescent current at no load. Voltage quality can be monitored by observing the PGOOD signal. The MAX16903 can operate in dropout by running at 97% duty cycle, making it ideal for automotive and industrial applications.

The MAX16903 operates at a 2.1MHz frequency, allowing for small external components and reduced output ripple. It guarantees no AM band interference. SYNC input programmability enables three frequency modes for optimized performance: forced fixed-frequency operation, skip mode (ultra-low quiescent current of 25µA), and synchronization to an external clock. The MAX16903 can be ordered with spread-spectrum frequency modulation, designed to minimize EMI-radiated emissions due to the modulation frequency.

The MAX16903 is available in a thermally enhanced, 3mm x 3mm, 10-pin TDFN package or a 16-pin TSSOP package. The MAX16903 operates over the -40°C to +125°C automotive temperature range.

Simplified Block Diagram

MAX16903: Functional Diagram MAX16903: Functional Diagram 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 .