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800mA、低噪声、升压型DC-DC转换器,带有500mA线性稳压器

高效boost转换器,集成LDO,用于电池供电设备

产品详情

主要特征

应用/用途

Parametric specs for Step-Down/Up Switching Regulators
VIN (V) (min) 1
VIN (V) (max) 5.5
VOUT1 (V) (min) 1.25
VOUT1 (V) (max) 5
IOUT1 (A) (max) 0.8
Switch Type Internal
Preset VOUT (V) 1.25
2.85
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
ICC (mA) (max) 0.2
# DC-DC Outputs 1
Alternate Topology Step-Up
# LDO/ Op.Amp. Outputs 1
Switching Frequency (kHz) 1000
Package/Pins QSOP/16
TSSOP/16
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
3.2
Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 1
VIN (V) (max) 5.5
VOUT1 (V) (min) 1.25
VOUT1 (V) (max) 5
IOUT1 (A) (max) 0.8
Switch Type Internal
Preset VOUT (V) 1.25
2.85
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
ICC (mA) (typ) 0.1
Shutdown Mode Supply Current (µA) (typ) 1
Shutdown Mode Supply Current (µA) (max) 10
# DC-DC Outputs 1
Switching Frequency (kHz) 1000
Package/Pins QSOP/16
TSSOP/16
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参量

Parametric specs for Step-Down/Up Switching Regulators
VIN (V) (min) 1
VIN (V) (max) 5.5
VOUT1 (V) (min) 1.25
VOUT1 (V) (max) 5
IOUT1 (A) (max) 0.8
Switch Type Internal
Preset VOUT (V) 1.25
2.85
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
ICC (mA) (max) 0.2
# DC-DC Outputs 1
Alternate Topology Step-Up
# LDO/ Op.Amp. Outputs 1
Switching Frequency (kHz) 1000
Package/Pins QSOP/16
TSSOP/16
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
3.2
Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 1
VIN (V) (max) 5.5
VOUT1 (V) (min) 1.25
VOUT1 (V) (max) 5
IOUT1 (A) (max) 0.8
Switch Type Internal
Preset VOUT (V) 1.25
2.85
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
ICC (mA) (typ) 0.1
Shutdown Mode Supply Current (µA) (typ) 1
Shutdown Mode Supply Current (µA) (max) 10
# DC-DC Outputs 1
Switching Frequency (kHz) 1000
Package/Pins QSOP/16
TSSOP/16

主要特征

  • High-Efficiency Step-Up Converter
    • Up to 93% Efficiency
    • Adjustable Output from +2.5V to +5.5V
    • Up to 800mA Output
    • PWM Synchronous-Rectified Topology
    • 1MHz Operating Frequency (or Sync)
  • LDO Linear Regulator
    • 500mA LDO Linear Regulator
    • 2.85V Linear Regulator Output or Adjustable (1.25V to 5V)
    • Low 125mV Dropout at 500mA
  • +0.7V to +5.5V Input Range
  • 0.1µA Logic-Controlled Shutdown
  • Adjustable Inductor Current Limit and Soft-Start
  • Thermal Shutdown
  • 1.5W, 16-Pin TSSOP-EP Package Available

应用/用途

  • 手持式仪表(PDA、掌上电脑)
  • 掌上电脑
  • PCS电话
  • 个人通信装置
  • 便携式音频播放器
  • 无线手机

描述

The MAX1765 is a high-efficiency, low-noise, step-up DC-DC converter intended for use in battery-powered wireless applications. This device operates at a high 1MHz fixed frequency while maintaining an exceptionally low quiescent supply current (200µA). Its small external components and tiny package make this device an excellent choice for small hand-held applications that require the longest possible battery life.

The MAX1765 uses a synchronous-rectified pulse-width-modulation (PWM) boost topology to generate 2.5V to 5.5V outputs from a wide range of input sources, such as one to three alkaline or NiCd/NiMH cells or a single lithium-ion (Li+) cell. Maxim's proprietary architecture significantly improves efficiency at low load currents while automatically transitioning to fixed-frequency PWM operation at medium to high load currents to maintain excellent full-load efficiency. Forced-PWM mode is available for applications that require constant-frequency operation at all load currents, and the MAX1765 may also be synchronized to an external clock to protect sensitive frequency bands in communications equipment.

The MAX1765's low-dropout (LDO) linear regulator and DC-DC converter have separate shutdown control. The linear regulator's 250mΩ pass device maintains excellent dropout voltage at currents up to 500mA. The MAX1765 also features analog soft-start and current-limit functions to permit optimization of efficiency, external component size, and output voltage ripple.

The MAX1765 comes in a 16-pin QSOP package and a thermally enhanced 16-pin TSSOP-EP.

简化框图

MAX1765:典型工作电路 MAX1765:典型工作电路 Zoom icon

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