The MAX1385/MAX1386 are RF LDMOS power devices for cellular base stations. They include a high-side current-sense amplifier, external diode-connected transistors to monitor LDMOS temperatures, an internal temperature sensor, a 12-bit ADC, two gate-drive channels, 8-bit coarse and 10-bit fine DACs, a gate-drive amplifier, autocalibration features, and an I2C/SPI-compatible serial interface.
The MAX1385 and MAX1386 are dual RF LDMOS bias controllers designed for cellular base stations. Each device includes a high‑side current‑sense programmable‑gain amplifier (gain 2, 10, or 25) for monitoring drain current, internal and external temperature sensors, a 12‑bit ADC, and two gate‑drive channels with 8‑bit coarse and 10‑bit fine DACs. The MAX1385 provides a gate‑drive amplifier gain of 2, while the MAX1386 provides a gain of 4. Both parts support I²C and SPI serial interfaces and are supplied in a 48‑pin thin QFN package.
The datasheet lists absolute maximum ratings, detailed electrical characteristics, timing specifications for I²C (slow/fast and high‑speed modes) and SPI, as well as recommended power‑up command sequences. Operating temperature ranges from –40 °C to +85 °C, and the devices operate from 4.75 V to 5.25 V analog, 2.7 V to 5.25 V digital, and 4.75 V to 11 V gate‑drive supplies.
| Analog Supply Voltage (AVDD) | 4.75 V – 5.25 V |
|---|---|
| Digital Supply Voltage (DVDD) | 2.7 V – 5.25 V |
| Gate‑Drive Supply Voltage (V_GATEVDD) | 4.75 V – 11.0 V |
| Supply Currents (AVDD / DVDD / V_GATEVDD) | 3.2 mA / 3.1 mA / 4.5 mA |
| Package | 48‑pin thin QFN |
| Operating Temperature Range | -40 °C to +85 °C |
| Current‑Sense PGA Gains | 2, 10, 25 |
| Gate‑Drive Amplifier Gain (MAX1385) | 2 |
| Gate‑Drive Amplifier Gain (MAX1386) | 4 |
Both devices feature an I²C‑compatible and an SPI‑compatible serial interface.
They operate from –40 °C to +85 °C.
The PGA can be programmed to gains of 2, 10, or 25.