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CDMA蜂窝电话/PCS电话系统电源

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主要特征

Parametric specs for Linear Regulators
VIN (V) (min) 2.5
VIN (V) (max) 5.5
Adj. VOUT (V) (min) 1.8
Adj. VOUT (V) (max) 3.3
Rated ILOAD (mA) 300
# Regulators 5
VDROPOUT @Rated ILOAD (V) (typ) 0.12
ICC (µA) (max) 680
Output Voltage Noise (µV RMS) (typ) 45
Ref. Bypass Yes
Low Batt./ Pwr. Fail Out No
POK/Reset Thresh. (V) (nom) Vout-13%
Vout-7.5%
Watchdog No
Reverse Batt. Protect. No
Oper. Temp. (°C) -40 to +85
Package/Pins TQFN/20
Budgetary
Price (See Notes)
2.16
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数据资料 CDMA蜂窝电话/PCS电话系统电源 Jun 03, 2010

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参量

Parametric specs for Linear Regulators
VIN (V) (min) 2.5
VIN (V) (max) 5.5
Adj. VOUT (V) (min) 1.8
Adj. VOUT (V) (max) 3.3
Rated ILOAD (mA) 300
# Regulators 5
VDROPOUT @Rated ILOAD (V) (typ) 0.12
ICC (µA) (max) 680
Output Voltage Noise (µV RMS) (typ) 45
Ref. Bypass Yes
Low Batt./ Pwr. Fail Out No
POK/Reset Thresh. (V) (nom) Vout-13%
Vout-7.5%
Watchdog No
Reverse Batt. Protect. No
Oper. Temp. (°C) -40 to +85
Package/Pins TQFN/20
Budgetary
Price (See Notes)
2.16

主要特征

  • 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

应用/用途

  • 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

描述

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.

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MAX1798、MAX1799:典型工作电路 MAX1798、MAX1799:典型工作电路 Zoom icon

Technical Docs

数据资料 CDMA蜂窝电话/PCS电话系统电源 Jun 03, 2010

支持和培训

在Maxim的知识库中搜索技术问题的答案

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Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心