MAX1705:1至3节电池、大电流、低噪声、升压型DC-DC转换器,带有线性稳压器

低噪声、双输出转换器,为蜂窝电话中的PA、无线基带和逻辑电路供电

The MAX1705/MAX1706 are high-efficiency, low-noise, step-up DC-DC converters with an auxiliary linear-regulator output. These devices are intended for use in battery-powered wireless applications. They use a synchronous rectifier pulse-width-modulation (PWM) boost topology to generate 2.5V to 5.5V outputs from battery inputs, such as 1 to 3 NiCd/NiMH cells or 1 Li-Ion cell. The MAX1705 has an internal 1A n-channel MOSFET switch. The MAX1706 has a 0.5A switch. Both devices also have a built-in low-dropout linear regulator that delivers up to 200mA. With an internal synchronous rectifier, the MAX1705/MAX1706 deliver 5% better efficiency than similar non-synchronous converters. They also feature a pulse-frequency-modulation (PFM) standby mode to improve efficiency at light loads, and a 1µA shutdown mode. An efficiency-enhancing track mode reduces the step-up DC-DC converter output to 300mV above the linear-regulator output. Both devices come in a 16-pin QSOP package, which occupies the same space as an 8-pin SO. Other features include two shutdown-control inputs for push-on/push-off control, and an uncommitted comparator for use as a voltage monitor.

关键特性
  • Up to 96% Efficiency
  • 1.1VIN Guaranteed Startup
  • Up to 850mA Output (MAX1705)
  • Step-Up Output (2.5V to 5.5V Adjustable)
  • Linear Regulator (1.25V to 5.0V Adjustable)
  • PWM/PFM Synchronous-Rectified Topology
  • 300kHz PWM Mode or Synchronizable
  • 1µA Shutdown Mode
  • Voltage Monitor
  • Pushbutton On/Off Control
应用
  • 数字无绳电话
  • 手持式仪表(PDA、掌上电脑)
  • 掌上电脑
  • PCS电话
  • 个人通信装置
  • 双向寻呼
  • 无线手机
数据手册DataSheet
语言下载文件备注
英文MAX1705-MAX1706.pdfRev 1; 05/2006
关键参数
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
IOUT1
(A)
Output Adjust. MethodSwitch TypePower Good SignalSynchronous SwitchingICC
(mA)
Shutdown Mode Supply Current
(µA)
Shutdown Mode Supply Current
(µA)
DC-DC OutputsOper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxmaxtyptypmaxSee Notes
MAX17050.75.52.55.50.8ResistorInternalYesYes0.11201400QSOP/16$3.69 @1k
MAX17060.4QSOP/16$2.96 @1k

Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
IOUT1
(A)
Output Adjust. MethodSwitch TypeSynchronous SwitchingPower Good SignalDC-DC OutputsAlternate TopologyOper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxmaxSee Notes
MAX17050.75.52.55.50.8ResistorInternalYesYes1
  • Step-Up
  • Step-Up/Down
400QSOP/16$3.69 @1k
MAX17060.4QSOP/16$2.96 @1k
开发工具
技术资料
相关产品
  • MAX1703:1节至3节电池、大功率(1.5A)、低噪声、升压型DC-DC转换器
  • MAX1700:1节至3节电池、大功率(1A)、低噪声、升压型DC-DC转换器
订购型号
型号状况推荐替代产品封装温度RoHS/无铅
MAX1705EEE停止供货QSOP,;16引脚;30.9mm²-40°C至+85°CRoHS/无铅:否
MAX1705EEE+生产中QSOP,;16引脚;30.9mm²-40°C至+85°CRoHS/无铅:无铅
MAX1705EEE+T生产中QSOP,;16引脚;30.9mm²-40°C至+85°CRoHS/无铅:无铅
MAX1705EEE-T停止供货MAX1705EEE+TQSOP,;16引脚;30.9mm²-40°C至+85°CRoHS/无铅:否
MAX1705-MAX1706.pdf MAX1706
Extend Battery Life with Dual Power Supply for Wallcube/Battery-Powered Systems MAX1705
Trading Performance for Cost in Portable Power Supplies MAX1705