The MAX1798/MAX1798A/MAX1799/MAX1799A system power supplies are designed specifically for CDMA cellular/PCS handsets. Each device contains five low-dropout linear regulators (LDOs), a 140ms (min) reset timer, a serial interface, push-on/push-off control logic, and two general-purpose open-drain outputs. Only the serial interface is different between the MAX1798/MAX1798A/MAX1799/MAX1799A: the MAX1798/MAX1798A feature an SPI™-compatible serial interface, and the MAX1799/MAX1799A feature an I²C-compatible interface. The "A" parts have a -13% reset threshold, the non-A parts have a 9.5% threshold. The "A" parts have a 175 delay on a reset-triggered shutdown, the non-A shutdown instantly.

Each linear regulator features extremely low dropout voltage, specified at two-thirds of the maximum output current. LDO1 is rated for 300mA, while LDOs 2–5 are each rated for 150mA. All LDOs are optimized for low noise and isolation. Each LDO can be individually enabled and disabled through the serial port, as well as individually programmed to any of 32 voltages from 1.8V to 3.3V.

The MAX1798/MAX1798A/MAX1799/MAX1799As' wide 2.5V to 5.5V input voltage range makes them compatible with a wide range of input supplies, including a single Li+ cell battery. Both devices are available in thermally enhanced 20-pin TSSOP and TQFN exposed pad (EP) packages. Evaluation kits (MAX1798EVKIT and MAX1799EVKIT) are available to facilitate designs.
MAX1798、MAX1799:典型工作电路 MAX1798、MAX1799:典型工作电路 放大+


  • One 300mA Low-Noise LDO
  • Four 150mA Low-Noise LDOs
  • 45µVRMS Noise from 10Hz to 100kHz
  • > 60dB Crosstalk Isolation Below 10kHz
  • > 60dB PSRR Below 10kHz
  • 125mV (max) Dropout (OUT1 at 200mA)
  • 100mV (max) Dropout (OUT2–5 at 100mA)
  • Programmable Output Voltages
    • 1.8V to 3.3V in 32 Steps
  • 140ms (min) Reset Timer
  • SPI- or I²C-Compatible Serial Interface
  • Push-On/Push-Off Control Logic
  • Two 150mA General-Purpose Open-Drain Outputs
  • Overcurrent and Thermal Protection (all LDOs)
  • 1µA Shutdown Current
  • 20-Pin Thermally-Enhanced TSSOP or TQFN Packages


  • 2节或3节NiMH、NiCd或碱性电池供电系统
  • CDMA蜂窝/PCS手机
  • 手持终端
  • 掌上电脑
  • PDA
  • 单节Li+电池供电系统

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.
申请可靠性报告: MAX1799 
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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Automotive Ultra Low Quiescent Current Linear Regulator Family

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