MAX1684

低噪声、14V输入、1A、PWM降压型转换器

尺寸最小的1.5A、降压型DC-DC,用于手持式PC,效率高达96%


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说明

The MAX1684/MAX1685 are high-efficiency, internal-switch, pulse-width modulation (PWM) step-down switching regulators intended to power cellular phones, communicating PDAs, and handy-terminals. These devices deliver a guaranteed 1A output current from two lithium-ion (Li+) batteries. Their wide-input voltage range of 2.7V to 14V gives design flexibility and allows batteries to charge from a wall cube, since the ICs operate at the higher voltages that occur when the battery is removed. The output voltage is preset to 3.3V or can be externally adjusted from 1.25V to VIN.

The low on-resistance power switch and built-in synchronous rectifier provide high efficiencies of up to 96%. There are four modes of operation: fixed-frequency, normal, low-power, and shutdown. The fixed-frequency PWM mode of operation offers excellent noise characteristics. The normal mode maintains high efficiency at all loads. The low-power mode is used to conserve power in standby or when full load is not required. The shutdown mode is used to power down the device for minimal current draw.

The MAX1684 runs at 300kHz for applications that require highest efficiency. The MAX1685 runs at 600kHz to allow the use of smaller external components. These devices can also be synchronized to an external clock. Other features include a 100% duty cycle for low-dropout applications, an auxiliary 3V/5mA output, and a 1% accurate reference.

Both devices are available in a space-saving 16-QSOP package. An evaluation kit is also available to help speed designs. For a similar device in a 10-pin µMAX® package with lower input voltage requirements (5.5V max), refer to the MAX1692 data sheet.
MAX1684、MAX1685:典型工作电路 MAX1684、MAX1685:典型工作电路 放大+

关键特性

  • Up to 96% Efficiency
  • 1A Guaranteed Output Current
  • 100% Duty Cycle in Dropout
  • 2.7V to 14V Input Range (15V Absolute Max)
  • ±1% Accurate Reference Output
  • 0.24Ω P-Channel On-Resistance
  • Synchronizable Switching Frequency
  • Fixed-Frequency PWM Operation
    • 300kHz (MAX1684)
    • 600kHz (MAX1685)
  • 150µA Normal-Mode Quiescent Current
  • 25µA Low-Power Mode Quiescent Current
  • 2µA Shutdown Current
  • Dual Mode™ Fixed 3.3V (±1%) Output or Adjustable Output (1.25V to VIN)
  • Small 16-QSOP Package
  • Auxiliary Output (CVL): 3V/5mA

应用

  • 蜂窝电话
  • 计算机外设
  • PDA与手持终端
  • 个人通信装置
  • 双向无线装置和对讲机

请查看具体的参数规格 Step-Down Switching Regulators (404)


Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
IOUT1
(A)
Switch TypeOper. Freq.
(kHz)
FeaturesPackage/PinsBudgetary
Price
minmaxminmaxmaxSee Notes
MAX1684 2.7141.25141Internal300
Current Limit
External Sync.
Fixed Freq./PWM
QSOP/16
$3.94 @1k
MAX1685 600
QSOP/16

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。

MAX1685EVKIT: MAX1684、MAX1685评估板
产品可靠性报告: MAX1684.pdf 
型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C   Material Composition  

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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