MAX16903

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

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


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.
MAX16903: Functional Diagram MAX16903: Functional Diagram Enlarge+

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
  • Military
Part Number VIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
Output Adjust. Method IOUT1
(A)
Switch Type Synchronous Switching Power Good Signal DC-DC Outputs Oper. Freq.
(kHz)
Budgetary
Price
min max min max max See Notes
MAX16903  3.5 28 3.3 5
3.3
5
Preset 1 Internal Yes Yes 1 2100 $3.50 @1k
See All Step-Down Switching Regulators (325)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX16903EVKIT: Evaluation Kit for the MAX16903

Technical Documents

App Note 4944 Layout Guidelines Maximize Automotive Power-Supply Performance and Minimize Emissions

Quality and Environmental Data

Request Reliability Report for: MAX16903 
Lead-Free Package Tin (Sn) Whisker Reports

Additional Resources

Topmark Coding MAX16903
 

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