MAX20457

36V Dual 3.5A/2A Synchronous Buck Converters for Automotive Applications

Low Iq Dual Buck Offering High Integration and Low BOM Cost for Automotive Applications


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说明

The MAX20457 offers two automotive-grade synchronous buck converters with fixed frequency of either 2.1MHz or 400kHz. The two high-voltage synchronous step-down converters operate 180 degrees out of phase. The IC operates with an input voltage supply from 3.5V to 36V and can operate in dropout conditions by running at 95% duty cycle. It is intended for applications with mid- to high-power requirements that operate at a wide input voltage range such as during automotive cold-crank or engine stop-start conditions.

High switching frequency up to 2.1MHz allows small external components, reduced output ripple, and guarantees no AM band interference. The switching frequency is fixed at 400kHz or 2.1MHz. FSYNC input programmability enables three modes for optimized performance: forced fixed-frequency operation, skip mode with ultra-low quiescent current, and phase-locked synchronization to an external clock. The spread spectrum option minimizes EMI interference.

The IC features power-OK indicators and undervoltage lockout for the buck converters. Protection features include cycle-by-cycle current limit and thermal shutdown. The MAX20457 is specified for operation over the -40°C to +125°C automotive temperature range.

关键特性

  • Meets Stringent OEM Module Power Consumption and Performance Specifications
    • 10µA Supply Current with 5V Buck On
    • 8µA Supply Current with 3.3V Buck On
    • 10µA Supply Current with Both Bucks On
  • Enables Crank-Ready Designs
    • Wide Input Supply Range from 3.5V to 36V
  • EMI Reduction Features Reduce Interference with Sensitive Radio Bands without Sacrificing Wide Input-Voltage Range
    • 20ns (typ) Minimum On-Time Guarantees Skip-Free Operation for 3.3V Output at 2.1MHz
    • Spread-Spectrum Option
    • Phase-Locked Loop (PLL) Frequency Synchronization
  • Integration and Thermally Enhanced Packages Save Board Space and Cost
    • Two 2.1MHz Current-Mode Converters with Forced Fixed Frequency and Skip Modes
    • Thermally Enhanced 5mm x 5mm, 28-Pin TQFN-EP Package
  • Protection Features Improve System Reliability
    • Supply Undervoltage Lockout
    • Overtemperature and Short-Circuit Protection

应用

  • null
  • 仪表板
  • 导航及无线电头单元
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Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeSynchronous SwitchingPower Good SignalDC-DC OutputsOper. Freq.
(kHz)
Design ToolsPackage/PinsBudgetary
Price
minmaxminmaxSee Notes
MAX20457 NEW!2.05360155V & 3.3VPreset or Adj3.5InternalYesYes22100EE-Sim
TQFN/28
$1.64 @1k
查看所有Step-Down Switching Regulators (402)
Pricing Notes:
价格仅供参考,用于同类产品的比较。所提供报价为美元,需要依汇率折合成人民币。该价格将因当地关税、税率和汇率而异。有关特定订购量和指定版本的报价和供货问题,请参考:价格与供货网站或与指定代理商联系。


MAX20457EVKIT: Evaluation Kit for the MAX20457

质量和环境数据

申请可靠性报告: MAX20457 
无铅封装的锡(Sn)晶须报告

工具和模型

  • EE-Sim: MAX20457 设计和仿真
  • 型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C  

    备注: 通过技术手段对故障率进行汇总,并映射到相关的材料部件号。 故障率与被测件的数量密切相关。

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