The LM3200 is a miniature, adjustable, step-down DC-DC converter with bypass mode for RF power amplifiers
The LM3200 is a DC‑DC converter optimized for powering RF power amplifiers from a single lithium‑ion cell. It steps down an input voltage of 2.7 V to 5.5 V to a variable output of 0.8 V to 3.6 V, with the output set by an analog control voltage. The device includes PWM, forced and automatic bypass modes, and a shutdown mode that reduces quiescent current to 0.1 µA.
Features include a 2 MHz typical switching frequency, a 10‑pin micro SMD package, current overload and thermal protection, and a compact layout that requires only three external components. Application notes cover board layout, SMD assembly, and handling of light sensitivity for the micro‑SMD package.
| Input Voltage Range | 2.7 V to 5.5 V |
|---|---|
| Output Voltage Range | 0.8 V to 3.6 V |
| Switching Frequency (typ.) | 2 MHz |
| Maximum Load (PWM mode) | 300 mA |
| Maximum Load (Bypass mode) | 500 mA |
| Package | 10‑pin micro SMD |
The LM3200 operates from 2.7 V to 5.5 V.
It can be set to any voltage between 0.8 V and 3.6 V.
The device can deliver up to 300 mA in PWM mode and 500 mA in bypass mode.
The typical switching frequency is 2 MHz.