1-Cell to 3-Cell / High-Power 1.5A / Low-Noise / Step-Up DC-DC Converter - Maxim
Description
19-1336; Rev 2; 11/98
NUAL KIT MA ATION EET H S A EVALU T WS DA FOLLO
1-Cell to 3-Cell, High-Power (1.
5A), Low-Noise, Step-Up DC-DC Converter
____________________________Features
o Up to 95% Efficiency o Up to 1.
5A Output o Fixed 5V or Adjustable Step-Up Output (2.
5V to 5.
5V) o 0.
7V to 5.
5V Input Range o Low-Power Mode (300µW) o Low-Noise, Constant-Frequency Mode (300kHz) o Synchronizable Switching Frequency (200kHz to 400kHz) o 1µA Logic-Controlled Shutdown o Power-Good Comparator o Uncommitted Gain Block
________________General Description
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, 75m Ω , 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-frequencymodulation (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.
MAX1703
Ordering Information
PART MAX1703ESE TEMP.
RANGE -40°C to +85°C PIN-PACKAGE 16 Narrow SO
________________________Applications
Digital Cordless Phones PCS Phones Wireless Handsets Two-Way Pagers Personal Communicators Palmtop Computers Hand-Hel...
Similar Datasheet
