The LM27313 is a 1.6MHz current-mode boost converter with an internal 30V FET switch, packaged in SOT-23, featuring extremely high power density. It is ideal for boosting voltages to 5V-28V.
The LM27313 switching regulator is a current‑mode boost converter that operates at a fixed 1.6 MHz frequency. Its 30 V internal DMOS FET and low‑Rds(on) enable high power density in the compact SOT‑23‑5 package, supporting output voltages from 5 V up to 28 V while delivering up to 800 mA of switch current. The device includes a logic‑level shutdown pin, cycle‑by‑cycle current limiting, thermal shutdown, and internal compensation to simplify design and reduce component count.
Typical applications include white‑LED drivers, PDA and palm‑top computers, digital cameras, portable phones, media players, and GPS devices. The datasheet provides detailed electrical characteristics, pin descriptions, layout recommendations, and design equations for selecting capacitors, inductors, diodes, and setting the output voltage.
| Switching Frequency | 1.6 MHz |
|---|---|
| Input Voltage Range | 2.7 V to 14 V |
| Switch Current Limit | 0.80 A to 1.25 A |
| Switch ON Resistance (Rds(on)) | 500 mΩ to 650 mΩ |
| Maximum Duty Cycle | 80 % to 88 % |
| Shutdown Current | <1 pA |
Ceramic capacitors with X5R or X7R dielectric are recommended for the input capacitor to provide low ESR and ESL.
The LM27313 can deliver up to 800 mA of switch current before the current‑limit circuit activates.