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 gen- erate 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 nonsyn- chronous 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.
The MAX1703 is a high‑efficiency, low‑noise step‑up DC‑DC converter intended for battery‑powered wireless devices. It features a synchronous‑rectified PWM boost topology that provides a 2.5 V to 5.5 V output from 0.7 V to 5.5 V inputs, up to 1.5 A output current, and includes a power‑good comparator and an uncommitted gain block.
The document provides pin configurations, absolute maximum ratings, electrical characteristics, and typical operating curves. It explains the two operating modes—high‑power PWM and low‑power PFM—along with synchronization options, shutdown behavior, and recommended bypass capacitor placement for optimal performance.
| Efficiency | up to 95 % |
|---|---|
| Maximum Output Current | 1.5 A |
| Input Voltage Range | 0.7 V to 5.5 V |
| Output Voltage | Fixed 5 V or adjustable 2.5 V‑5.5 V |
| Shutdown Current | 1 µA |
| Power‑Good Comparator Threshold | 1.250 V |
| Package | 16‑pin narrow SO |
The device can deliver up to 1.5 A of output current.
The shutdown mode draws only 1 µA of current.
The converter operates from 0.7 V up to 5.5 V input.