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Status
Part Number	Status
MAX1385	Active: In Production.
MAX1386	Future Product

Data Sheet

FULL DATA SHEET (PDF, 508kB) Download   E-Mail

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.

An evaluation kit is available:  MAX1385EVC16, MAX1385EVKIT  

Key Features		Applications/Uses
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 Voltage 10-Bit DAC Control of Gate-Bias Offset with Temperature Internal Die Temperature Measurement External Temperature Measurement by Diode-Connected Transistor (2N3904) Internal 12-Bit ADC Measurement of Temperature, Current, and Voltages Selectable I²C-/SPI-Compatible Serial Interface 400kHz/1.7MHz/3.4MHz I²C-Compatible Control for Settings and Data Measurement 16MHz SPI-Compatible Control for Settings and Data Measurement Internal 2.5V Reference Three Address Inputs to Control Eight Devices in I²C Mode		Industrial Process Control RF LDMOS Bias-Control in Cellular Base Stations

Diagram

Typical Operating Circuit (I²C Mode)

Application Notes

Application Note 4065: Implementing a MAX1385-Based Control Loop in C/C++ - MAX1385, MAX1386

Evaluation Kits

MAX1385EVC16, MAX1385EVKIT

Design Guides

Wireless Infrastructure (PDF)

Reliability Reports

Show FIT data for: MAX1385 Request Reliability Report for: MAX1385 MAX1386

Software/Models

none

Ordering Information

Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-4 of 4

MAX1385	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1385BUTM+T			Active	Land Pattern: Not Available	0°C to +85°C	See data sheet
MAX1385BETM+T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX1385BETM+			Active	TQFN;48 pin;50.4 mm² Outline Drawing: 21-0144 (PDF) Land Pattern: 90-0039 (PDF) Use pkgcode/variation: T4877M+6*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1385BUTM+			Active	TQFN;48 pin;50.4 mm² Outline Drawing: 21-0144 (PDF) Land Pattern: 90-0039 (PDF) Use pkgcode/variation: T4877M+6*	0°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

More Information

New Product Press Release 2009-04-02

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Description   Key Features   Applications/Uses   Key Specifications   Diagram

Data Sheet   Application Notes   Design Guides   Engineering Journals   Reliability Reports   Software/Models   Evaluation Kits

Price and Availability   Samples   Buy Online   Package Information   Lead-Free Information

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