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MAX1385

Maxim Integrated Products
Part Number MAX1385
Manufacturer Maxim Integrated Products
Description (MAX1385 / MAX1386) Dual RF LDMOS Bias Controllers
Published Jul 29, 2009
Detailed Description 19-4456; Rev 0; 2/09 www.DataSheet4U.com KIT ATION EVALU LE B A IL A AV Dual RF LDMOS Bias Controllers with I2C/SPI In...
Datasheet PDF File MAX1385 PDF File

MAX1385
MAX1385

Overview
19-4456; Rev 0; 2/09 www.
DataSheet4U.
com KIT ATION EVALU LE B A IL A AV Dual RF LDMOS Bias Controllers with I2C/SPI Interface General Description The MAX1385/MAX1386 set and control bias conditions for dual RF LDMOS power devices found in cellular base stations.
Each device includes a high-side current-sense amplifier with programmable gains of 2, 10, and 25 to monitor LDMOS drain current over the 20mA to 5A range.
Two external diode-connected transistors monitor LDMOS temperatures while an internal temperature sensor measures the local die temperature of the MAX1385/MAX1386.
A 12-bit ADC converts the programmable-gain amplifier (PGA) outputs, external/internal temperature readings, and two auxiliary inputs.
The two gate-drive channels, each consisting of 8-bit coarse and 10-bit fine DACs and a gate-drive amplifier, generate a positive gate voltage to bias the LDMOS devices.
The MAX1385 includes a gate-drive amplifier with a gain of 2 and the MAX1386 gate-drive amplifier provides a gain of 4.
The 8-bit coarse and 10-bit fine DACs allow up to 18 bits of resolution.
The MAX1385/ MAX1386 include autocalibration features to minimize error over time, temperature, and supply voltage.
The MAX1385/MAX1386 feature an I2C/SPI™-compatible serial interface.
Both devices operate from a 4.
75V to 5.
25V analog supply (3.
2mA supply current), a 2.
7V to 5.
25V digital supply (3.
1mA supply current), and a 4.
75V to 11.
0V gate-drive supply (4.
5mA supply current).
The MAX1385/MAX1386 are available in a 48-pin thin QFN package.
Features ♦ Integrated High-Side Drain Current-Sense PGA with Gain of 2, 10, or 25 ♦ ±0.
5% Accuracy for Sense Voltage Between 75mV and 250mV ♦ Full-Scale Sense Voltage of 100mV with Gain of 25 ♦ Full-Scale Sense Voltage of 250mV with Gain of 10 ♦ Common-Mode Range of 5V to 30V Drain Voltage for LDMOS ♦ Adjustable Low Noise 0 to 5V, 0 to 10V Output Gate-Bias Voltage Ranges with ±10mA Gate Drive ♦ Fast Clamp to 0V for LDMOS Protection ♦ 8-Bit DAC Control of Gate-Bias...


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