MAX1701
1节至3节电池、大功率(1A)、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
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The MAX1700/MAX1701 are high-efficiency, low-noise, step-up DC-DC converters intended for use in battery-powered wireless applications. They use a synchronous-rectified pulse-width-modulation (PWM) boost topology to generate 2.5V to 5.5V outputs from battery inputs such as one to three NiCd/NiMH cells or one Li-Ion cell. Both devices have an internal 1A, 130mΩ N-channel MOSFET switch and a 250mΩ P-channel synchronous rectifier.With their internal synchronous rectifier, the MAX1700/ MAX1701 deliver 5% better efficiency than similar nonsynchronous converters. They also feature a pulse-frequency-modulation (PFM) standby mode to improve efficiency at light loads, and a 3µA shutdown mode.
The MAX1700/MAX1701 come in 16-pin QSOP packages (which occupy the same space as an 8-pin SO). The MAX1701 includes two comparators to generate power-good and low-battery warning outputs. It also contains a gain block that can be used to build a linear regulator using an external P-channel pass device.
For higher-power outputs, refer to the MAX1703. For dual outputs (step-up and linear regulator), refer to the MAX1705/MAX1706. For an on-board analog-to-digital converter, refer to the MAX848/MAX849.
The MAX1701 evaluation kit is available to speed design time.
关键特性
- Up to 96% Efficiency
- 1.1 VIN Guaranteed Start-Up
- 0.7V to 5.5V Input Range
- Up to 800mA Output
- Step-Up Output (adjustable from 2.5V to 5.5V)
- PWM/PFM Synchronous-Rectified Topology
- External Clock or Internal 300kHz Oscillator
- 3µA Logic-Controlled Shutdown
- Power-Good Output (MAX1701)
- Low-Battery Comparator (MAX1701)
- Uncommitted Gain Block (MAX1701)
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
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