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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1386 Datasheet

(MAX1385 / MAX1386) Dual RF LDMOS Bias Controllers

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19-4456; Rev 0; 2/09
www.DataSheet4EUV.cAAoLVmUAAILTAIOBNLEKIT
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 cur-
rent-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 temper-
ature sensor measures the local die temperature of the
MAX1385/MAX1386. A 12-bit ADC converts the pro-
grammable-gain amplifier (PGA) outputs, external/inter-
nal 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.
Applications
RF LDMOS Bias Control in Cellular Base Stations
Industrial Process Control
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
Ordering Information/Selector Guide
PART
TEMP RANGE
MAX1385AETM+**
-40°C to +85°C
MAX1385BETM+
-40°C to +85°C
MAX1386AETM+**
-40°C to +85°C
MAX1386BETM+**
-40°C to +85°C
*EP = Exposed pad.
**Future product—contact factory for availability.
+Denotes a lead(Pb)-free/RoHS-compliant package.
PIN-PACKAGE
48 Thin QFN-EP*
48 Thin QFN-EP*
48 Thin QFN-EP*
48 Thin QFN-EP*
TEMP ERROR (°C)
±1
±2
±1
±2
VGATE (V)
5
5
10
10
Pin Configuration and Typical Operating Circuit (I2C Mode)
appear at end of data sheet.
SPI is a trademark of Motorola, Inc.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1386 Datasheet

(MAX1385 / MAX1386) Dual RF LDMOS Bias Controllers

No Preview Available !

www.DataSheet4U.com
Dual RF LDMOS Bias Controllers
with I2C/SPI Interface
ABSOLUTE MAXIMUM RATINGS
AVDD to AGND .........................................................-0.3V to +6V
DVDD to DGND.........................................................-0.3V to +6V
AGND to DGND.....................................................-0.3V to +0.3V
CS1+, CS1-, CS2+, CS2- to GATEGND.................-0.3V to +32V
CS1- to CS1+, CS2- to CS2+ ...................................-6V to +0.3V
GATEVDD to GATEGND .........................................-0.3V to +12V
GATE1, GATE2 to GATEGND ...........-0.3V to (GATEVDD + 0.3V)
SAFE1, SAFE2 to GATEGND....................................-0.3V to +6V
GATEGND to AGND..............................................-0.3V to +0.3V
All Other Analog Inputs
to AGND ............-0.3V to the lower of +6V and (AVDD + 0.3V)
Digital Inputs
to DGND ............-0.3V to the lower of +6V and (DVDD + 0.3V)
SDA/DIN, SCL to DGND...........................................-0.3V to +6V
Digital Outputs to DGND .........................-0.3V to (DVDD + 0.3V)
Maximum Continuous Current into Any Pin ........................50mA
Continuous Power Dissipation (TA = +70°C)
48-Pin, 7mm x 7mm, Thin QFN (derate 27.8 mW/°C
above +70°C).............................................................2222mW
Maximum Junction Temperature .....................................+150°C
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(GATEVDD = +5.5V for the MAX1385, GATEVDD = +11V for the MAX1386, AVDD = DVDD = +5V, external VREFADC = +2.5V, external VREF-
DAC = +2.5V, CREF = 0.1µF, unless otherwise noted. TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
HIGH-SIDE CURRENT SENSE WITH PGA
CONDITIONS
MIN TYP MAX UNITS
Common-Mode Input Voltage
Range
VCS+, VCS-
5 30 V
Common-Mode Rejection Ratio
Input-Bias Current
Full-Scale Sense Voltage Range
Sense Voltage Range for
Accuracy of ±0.5% VSENSE
Sense Voltage Range for
Accuracy of ±2% VSENSE
Total PGAOUT Voltage Error
PGAOUT Capacitive Load
PGAOUT Settling Time
CMRR
ICS+
ICS-
VSENSE =
VCS_+ -
VCS_-
CPGAOUT
tHSCS
11V < VCS+ < 30V
VSENSE < 100mV over the common-mode
range
PGA gain = 25
PGA gain = 10
PGA gain = 2
PGA gain = 25
PGA gain = 10
PGA gain = 2
PGA gain = 25
PGA gain = 10
PGA gain = 2
VSENSE = 75mV
Settles to within ±0.5% of final value, RS =
50, CGATE = 15pF
90
120 195
0.002 ±2
0 100
0 250
0 1250
75 100
75 250
75 1250
20 100
20 250
20 1250
±0.1 ±0.5
100
< 25
dB
µA
mV
mV
mV
%
pF
µs
Saturation Recovery Time
Sense-Amplifier Slew Rate
Settles to within ±0.5% accuracy; from
VSENSE = 3 x full scale
AvPGA = 2
AvPGA = 10
AvPGA = 25
< 45
0.5
2
2
µs
V/µs
2 _______________________________________________________________________________________


Part Number MAX1386
Description (MAX1385 / MAX1386) Dual RF LDMOS Bias Controllers
Maker Maxim Integrated Products
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MAX1386 Datasheet PDF





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