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Dual RF LDMOS Bias Controller with Nonvolatile Memory

Offers Integration and Reduces Cost with Power Savings

Product Details

Key Features

Parametric specs for Bias Controllers
Gate Drive Range (V) 0.1 to AVDD-0.1
VBIAS Clamp Yes
# Channels 2
High-Side Current Sense Gain 2 @ 32V
Loop Control Internal LUTs
Lookup Table Index Temperature
Voltage
Lookup Table Memory Nonvolatile
Interface I2C
SPI
ADCs 12-bit
DACs 12-bit
Reference External
Internal
Temp. Sensor External
Internal
AVDD (V) (min) 5.25
DVDD (V) (min) 5.25
Package/Pins TQFN HYBRID/48
Budgetary
Price (See Notes)
9.24
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Simplified Block Diagram

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Parameters

Parametric specs for Bias Controllers
Gate Drive Range (V) 0.1 to AVDD-0.1
VBIAS Clamp Yes
# Channels 2
High-Side Current Sense Gain 2 @ 32V
Loop Control Internal LUTs
Lookup Table Index Temperature
Voltage
Lookup Table Memory Nonvolatile
Interface I2C
SPI
ADCs 12-bit
DACs 12-bit
Reference External
Internal
Temp. Sensor External
Internal
AVDD (V) (min) 5.25
DVDD (V) (min) 5.25
Package/Pins TQFN HYBRID/48
Budgetary
Price (See Notes)
9.24

Key Features

  • On-Chip 4Kb EEPROM for Storing LDMOS Bias Characteristics
  • Integrated High-Side Current-Sense PGA with Gain of 2, 10, or 25
  • ±0.75% Accuracy for Sense Voltage Between +75mV and +1250mV
  • Full-Scale Sense Voltage
    • +100mV with a Gain of 25
    • +250mV with a Gain of 10
    • +1250mV with a Gain of 2
  • Common-Mode Range, LDMOS Drain Voltage: +5V to +32V
  • Adjustable Low-Noise 0 to AVDD Output Gate Bias Voltage Range
  • Fast Clamp to AGND for LDMOS Protection
  • 12-Bit DAC Control of Gate with Temperature
  • Internal Die Temperature Measurement
  • 2-Channel External Temperature Measurement through Remote Diodes
  • Internal 12-Bit ADC Measurement for Temperature, Current, and Voltage Monitoring
  • User-Selectable Serial Interface
    • 400kHz/1.7MHz/3.4MHz I²C-Compatible Interface
    • 16MHz SPI-/MICROWIRE-Compatible Interface

Applications/Uses

  • Cellular Base Stations
  • Feed-Forward Power Amps
  • Industrial Process Control
  • Microwave Radio Links
  • Transmitters

Description

The MAX11008 controller biases RF LDMOS power devices found in cellular base stations and other wireless infrastructure equipment. Each controller includes a high-side current-sense amplifier with programmable gains of 2, 10, and 25 to monitor the LDMOS drain current over a range of 20mA to 5A. The MAX11008 supports up to two external diode-connected transistors to monitor the LDMOS temperatures while an internal temperature sensor measures the local die temperature. A 12-bit successive-approximation register (SAR) analog-to-digital converter (ADC) converts the analog signals from the programmable-gain amplifiers (PGAs), external temperature sensors, internal temperature measurement, and two additional auxiliary inputs. The MAX11008 automatically adjusts the LDMOS bias voltages by applying temperature, AIN, and/or drain current samples to data stored in lookup tables (LUTs).

The MAX11008 includes two gate-drive channels, each consisting of a 12-bit DAC to generate the positive gate voltage for biasing the LDMOS devices. Each gate-drive output supplies up to ±2mA of gate current. The gate-drive amplifier is current-limited to ±25mA and features a fast clamp to AGND.

The MAX11008 contains 4Kb of on-chip, nonvolatile EEPROM organized as 256 bits x 16 bits to store LUTs and register information. The device operates from either a 4-wire 16MHz SPI™-/MICROWIRE™-compatible or an I²C-compatible serial interface.

The MAX11008 operates from a +4.75V to +5.25V analog supply with a typical supply current of 2mA, and a +2.7V to +5.25V digital supply with a typical supply of 3mA. The device is packaged in a 48-pin, 7mm x 7mm, thin QFN package and operates over the extended (-40°C to +85°C) temperature range.

Simplified Block Diagram

MAX11008: Functional Diagram MAX11008: Functional Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .