|
|
|
MAX1385, MAX1386
Dual RF LDMOS Bias Controllers with I²C/SPI Interface
Offers Integration, Reduces Cost with Power Savings
|
Status
| Part Number |
Status |
|
MAX1385
|
Active: In Production. |
|
MAX1386
|
Future Product |
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.
|
|
Data Sheet
|
An evaluation kit is available: MAX1385EVC16, MAX1385EVKIT
Key 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 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
|
|
Applications/Uses
- Industrial Process Control
- RF LDMOS Bias-Control in Cellular Base Stations
|
|
|
|
Key Specifications:
| Bias Controllers |
| Part Number |
Gate Drive Range
(V) |
VBIAS Clamp |
Channels |
High-Side Current Sense Gain |
Loop Control |
Interface |
ADCs |
DACs |
Reference |
Temp. Sensor |
AVDD
(V) |
DVDD
(V) |
Gate Supply
(V) |
Package/Pins |
Budgetary Price |
| min |
min |
See Notes |
| MAX1385 |
0 to 5 |
Yes |
2 |
2 @ 30V |
External Micro |
|
12-bit |
|
|
|
5.25 |
5.25 |
4.75 to 11 |
|
$6.20 @1k |
|
See All Bias Controllers (3)
|
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
|
|
Diagram
Typical Operating Circuit (I²C Mode)
Application Notes
Product Guides
Reliability Reports
| Show FIT data for: |
|
| Request Reliability Report for: |
|
Software/Models
Ordering Information
|
Part Number
|
Free
Sample |
Buy |
Status
|
Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
|
Temp |
RoHS/Lead-Free?
Materials Analysis
|
| 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 |
| MAX1385BETM+T
|
|
|
Active |
QFN;
Land Pattern: Not Available
|
-40°C to +85°C
|
See data sheet
|
| 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 |
| MAX1385BUTM+T
|
|
|
Active |
QFN;
Land Pattern: Not Available
|
0°C to +85°C
|
See data sheet
|
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; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product 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.
|
Similar Products by Function
Similar Products by Application
Evaluation Kits
Products with Similar Part Numbers
More Information
Didn't Find What You Need?
Information Index
Document Ref.: 19-4456
Rev 0;
2009-02-25
This page last modified: 2009-09-04
|
|
|
Download
E-Mail