MAX1701
1 Cell to 3 Cell, High-Power 1A, Low-Noise, Step-Up DC-DC Converters
Compact, High-Efficiency, Low-Noise Step-Up Converter with a Gain-Block
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Overview
Features and Benefits
- 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)
Product Details
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.
Applications
- Digital Cordless Phones
- Handheld Instruments (PDAs, Palmtops)
- Palmtop Computers
- PCS Phones
- Personal Communicators
- Two-Way Paging
- Wireless Handsets
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Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (2)
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