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1节至3节电池、大功率(1.5A)、低噪声、升压型DC-DC转换器

紧凑的高效、低噪声升压转换器,带有增益电路

产品详情

主要特征

应用/用途

Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 0.7
VIN (V) (max) 5.5
VOUT1 (V) (min) 2.5
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 1.5
Switch Type Internal
Preset VOUT (V) 5
Output Adjust. Method Resistor
Synchronous Switching? Yes
ICC (mA) (typ) 0.065
Shutdown Mode Supply Current (µA) (typ) 0.1
Shutdown Mode Supply Current (µA) (max) 20
# DC-DC Outputs 1
Switching Frequency (kHz) 400
Package/Pins SOIC (N)/16
Budgetary
Price (See Notes)
5.18
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参量

Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 0.7
VIN (V) (max) 5.5
VOUT1 (V) (min) 2.5
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 1.5
Switch Type Internal
Preset VOUT (V) 5
Output Adjust. Method Resistor
Synchronous Switching? Yes
ICC (mA) (typ) 0.065
Shutdown Mode Supply Current (µA) (typ) 0.1
Shutdown Mode Supply Current (µA) (max) 20
# DC-DC Outputs 1
Switching Frequency (kHz) 400
Package/Pins SOIC (N)/16
Budgetary
Price (See Notes)
5.18

主要特征

  • Up to 95% Efficiency
  • Up to 1.5A Output
  • Fixed 5V or Adjustable Step-Up Output (2.5V to 5.5V)
  • 0.7V to 5.5V Input Range
  • Low-Power Mode (300µW)
  • Low-Noise, Constant-Frequency Mode (300kHz)
  • Synchronizable Switching Frequency (200kHz to 400kHz)
  • 1µA Logic-Controlled Shutdown
  • Power-Good Comparator
  • Uncommitted Gain Block

应用/用途

  • 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

描述

The MAX1703 is a high-efficiency, low-noise, step-up DC-DC converter intended for use in battery-powered wireless applications. It uses a synchronous-rectified pulse-width-modulation (PWM) boost topology to generate a 2.5V to 5.5V output from battery inputs, such as one to three NiCd/NiMH cells or one Li-Ion cell. The device includes a 2A, 75mΩ, N-channel MOSFET switch and a 140mΩ, P-channel synchronous rectifier.

With its internal synchronous rectifier, the MAX1703 delivers up to 5% better efficiency than similar nonsynchronous converters. It also features a pulse-frequency-modulation (PFM) low-power mode to improve efficiency at light loads, and a 1µA shutdown mode.

The MAX1703 comes in a 16-pin narrow SO package and includes an uncommitted comparator that generates a power-good or low-battery-warning output. It also contains a linear gain block that can be used to build a linear regulator.

For lower-power outputs and a smaller package, refer to the MAX1700/MAX1701. For dual outputs (step-up plus linear regulator), refer to the MAX1705/MAX1706. For an on-board analog-to-digital converter, refer to the MAX848/MAX849.

The MAX1703 evaluation kit is available to speed designs.

简化框图

MAX1703:典型工作电路 MAX1703: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

过滤搜索

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