MAX1774

双路、高效率、降压型转换器,带有备用电池切换开关

双输出降压型DC-DC转换器,用于PDA/掌上电脑,提供自动电池切换


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说明

The MAX1774 is a complete power-supply solution for PDAs and other hand-held devices. It integrates two high-efficiency step-down converters, a boost converter for backup battery regulation, and four voltage detectors in a small 32-pin QFN or 28-pin QSOP package.

The MAX1774 accepts inputs from +2.7V to +28V and provides an adjustable main output from 1.25V to 5.5V at over 2A. The secondary core converter delivers an adjustable voltage from 1V to 5V and can deliver up to 1.5A. Both the main and core regulators have separate shutdown inputs.

When the AC adapter power is removed, an external P-channel MOSFET switches input to the main battery. When the main battery is low, the backup step-up converter sustains the main output voltage. When the backup battery can no longer deliver the required load, the system shuts down safely to prevent damage. Four on-board voltage detectors monitor the status of the AC adapter power, main battery, and backup battery.

The MAX1774 evaluation kit is available to help reduce design time.
MAX1774:功能框图 MAX1774:功能框图 放大+

关键特性

  • Dual, High-Efficiency, Synchronous-Rectified Step-Down Converters
  • Thin, Small (1mm High) QFN Package
  • Step-Up Converter for Backup Battery
  • Main Power
    • Adjustable from +1.25V to +5.5V
    • Over 2A Load Current
    • Up to 95% Efficiency
  • Core Power
    • Adjustable from 1V to 5V
    • Internal Switches
    • Up to 1.5A Load Current
    • Up to 91% Efficiency
  • Automatic Main Battery Switchover
  • 100% (max) Duty Cycle
  • Up to 1.25MHz Switching Frequency
  • Input Voltage Range from +2.7V to +28V
  • Four Low-Voltage Detectors
  • 170µA Quiescent Current
  • 8µA Shutdown Current
  • Digital Soft-Start
  • Independent Shutdown Inputs

应用

  • 手持式计算机
  • 网络浏览器
  • PDA
  • POS终端
  • 亚笔记本电脑
Part NumberPrimary TopologyMonitor/Control FeaturesDC-DC/Power FeaturesBattery Charger FeaturesVIN
(V)
VIN
(V)
VOUT
(V)
VOUT
(V)
Max. IOUT
(A)
Max. IOUT
(A)
Oper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxSee Notes
MAX1774 Step-DownShutdown
Current Limit
Fixed Freq./PWM
Soft Start
Sync. Rectifier
Battery Backup2.72815.522600
QSOP/28
$4.23 @1k
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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。

技术资料

应用笔记 2767 DAC Makes Controller Programmable
应用笔记 2018 Protection From Blackouts: Dirt Cheap to Fully Integrated

质量和环境数据

申请可靠性报告: MAX1774 
无铅封装的锡(Sn)晶须报告
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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