MAX1798:CDMA蜂窝电话/PCS电话系统电源

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.

关键特性
  • 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
MAX1798、MAX1799:典型工作电路
MAX1798、MAX1799:典型工作电路
应用
  • 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
数据手册DataSheet
语言下载文件备注
英文MAX1798-MAX1799.pdfRev 2; 06/2010
关键参数
Part NumberRegulatorsVIN
(V)
VIN
(V)
Adj. VOUT
(V)
Adj. VOUT
(V)
VDROPOUT @Rated ILOAD
(V)
Rated ILOAD
(mA)
Rated ILOAD
(mA)
ICC
(µA)
Output Voltage Noise
(µV RMS)
Ref. BypassLow Batt./ Pwr. Fail OutPOK/Reset Thresh.
(V)
WatchdogReverse Batt. Protect.Oper. Temp.
(°C)
Package/Pins
minmaxminmaxtypmaxtypnom
MAX179852.55.51.83.30.1230030068045YesNo
  • Vout-13%
  • Vout-7.5%
NoNo-40 to +85
  • QFN/20
  • TSSOP-EP/20
MAX1799
  • QFN/20
  • TQFN/20
  • TSSOP-EP/20
开发工具
质量和环境数据
订购型号
型号状况推荐替代产品封装温度RoHS/无铅
MAX1798AEUP停止供货TSSOP-EP,;20引脚;42.9mm²-40°C至+85°CRoHS/无铅:否
MAX1798AEUP-T停止供货TSSOP-EP,;20引脚;42.9mm²-40°C至+85°CRoHS/无铅:否
MAX1798EGP停止供货QFN,;20引脚;26mm²-40°C至+85°CRoHS/无铅:否
MAX1798EGP+停止供货MAX1678EUA+QFN,;20引脚;26mm²-40°C至+85°CRoHS/无铅:无铅
MAX1798EGP+T停止供货MAX1678EUA+QFN;-40°C至+85°C参考数据资料
MAX1798EGP-T停止供货QFN;20引脚-40°C至+85°C参考数据资料
MAX1798ETP+停止供货TQFN;-40°C至+85°C参考数据资料
MAX1798EUP停止供货MAX1798EUP+TSSOP-EP,;20引脚;42.9mm²-40°C至+85°CRoHS/无铅:否
MAX1798EUP+生产中TSSOP-EP,;20引脚;42.9mm²-40°C至+85°CRoHS/无铅:无铅
MAX1798EUP+T生产中TSSOP-EP,;20引脚;42.9mm²-40°C至+85°CRoHS/无铅:无铅
型号状况推荐替代产品封装:类型 引脚 占位面积封装图 编码/变更 *温度RoHS/无铅?
MAX1798EUP-T停止供货MAX1798EUP+TTSSOP-EP,;20引脚;42.9mm²-40°C至+85°CRoHS/无铅:否
MAX1798-MAX1799.pdf MAX1799
MAX1798.pdf MAX1798
典型工作电路 MAX1799