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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX5075 Datasheet

Push-Pull FET Driver

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MAX5075 pdf
19-3662; Rev 0; 5/05
www.DataSheet4U.com
Push-Pull FET Driver with Integrated Oscillator
and Clock Output
General Description
The MAX5075 is a +4.5V to +15V push-pull, current-fed
topology driver subsystem with an integrated oscillator
for use in telecom module power supplies. The device
drives two MOSFETs connected to a center-tapped
transformer primary providing secondary-side, isolated,
negative or positive voltages. This device features a pro-
grammable, accurate, integrated oscillator with a syn-
chronizing clock output that synchronizes an external
PWM regulator. A single external resistor programs the
internal oscillator frequency from 50kHz to 1.5MHz.
The MAX5075 incorporates a dual MOSFET driver with
±3A peak drive currents and 50% duty cycle. The
MOSFET driver generates complementary signals to
drive external ground-referenced n-channel MOSFETs.
The MAX5075 is available with a clock output frequency
to MOSFET driver frequency ratio of 1x, 2x, and 4x. The
MAX5075 is available in a thermally enhanced 8-pin
µMAX® package and is specified over the -40°C to
+125°C operating temperature range.
Applications
Current-Fed, High-Efficiency Power-Supply Modules
Power-Supply Building Subsystems
Push-Pull Driver Subsystems
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Pin Configuration appears at end of data sheet.
Features
Current-Fed, Push-Pull Driver Subsystem
Programmable, Accurate Internal Oscillator
Single +4.5V to +15V Supply Voltage Range
Dual ±3A Gate-Drive Outputs
1mA Operating Current at 250kHz with No
Capacitive Load
Synchronizing Clock Frequency Generation
Options
Thermally Enhanced 8-Pin µMAX Package
-40°C to +125°C Operating Temperature Range
Ordering Information
PART
PIN-
TOP PKG fCLK/fNDRV_
PACKAGE MARK CODE RATIO
MAX5075AAUA 8 µMAX-EP* AAAU U8E-2
MAX5075BAUA 8 µMAX-EP* AAAV U8E-2
1
2
MAX5075CAUA 8 µMAX-EP* AAAW U8E-2
4
*EP = Exposed paddle.
Note: All devices specified for -40°C to +125°C operating
temperature range.
Typical Operating Circuit
VIN
VIN
DRVH
VOUT
PWM
CONTROLLER
SYNCIN
DRVL
GND
VCC
VCC
NDRV2
CLK MAX5075
NDRV1
RT
DGND I.C. PGND
GND
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX5075 Datasheet

Push-Pull FET Driver

No Preview Available !

MAX5075 pdf
www.DataSheet4U.com
Push-Pull FET Driver with Integrated Oscillator
and Clock Output
ABSOLUTE MAXIMUM RATINGS
VCC to DGND, PGND .............................................-0.3V to +18V
CLK, RT to DGND.....................................................-0.3V to +6V
NDRV1, NDRV2 to PGND...........................-0.3V to (VCC + 0.3V)
DGND to PGND.....................................................-0.3V to +0.3V
CLK Current......................................................................±20mA
NDRV1, NDRV2 Peak Current (200ns) ..................................±5A
NDRV1, NDRV2 Reverse Current (Latchup Current)......±500mA
Continuous Power Dissipation (TA = +70°C)
8-Pin µMAX (derate 10.3mW/°C above +70°C) ...........825mW
Operating Temperature Range .........................-40°C to +125°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-60°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
(VCC = +12V, RRT = 124k, NDRV1 = NDRV2 = open, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are measured
at TA = +25°C.) (Note 1)
PARAMETER
SUPPLY
Input Voltage Supply Range
Switching Supply Current
Undervoltage Lockout
UVLO Hysteresis
OSCILLATOR
Frequency Range
Accuracy
Oscillator Jitter
SYMBOL
VCC
ICCSW
VUVLO
fOSC
CLK Output High Voltage
CLK Output Low Voltage
CLK Output Rise Time
CLK Output Fall Time
GATE DRIVERS (NDRV1, NDRV2)
CONDITIONS
fOSC = 250kHz
VCC rising
(Note 2)
fOSC = 250kHz , 6V VCC 15V (Note 3)
ICLK = 1mA
ICLK = -1mA
CCLK = 30pF
CCLK = 30pF
7V VCC 15V
4.5V VCC 7V
Output High Voltage
VOH
INDRV1 = INDRV2 = 100mA
Output Low Voltage
Output Peak Current
Driver Output Impedance
Latchup Current Protection
Rise Time
Fall Time
VOL INDRV1 = INDRV2 = -100mA
IP Sourcing and sinking
NDRV_ sourcing 100mA
NDRV_ sinking 100mA
Reverse current at NDRV1/NDRV2
tR CLOAD = 2nF
tF CLOAD = 2nF
MIN TYP MAX UNITS
4.5 15.0 V
1 3 mA
3 3.5 4
V
300 mV
50 1500 kHz
-8 +10 %
±0.6
%
4.1 5.0
V
3.5 5.0
50 mV
35 ns
10 ns
VCC -
0.3
3
1.8
1.6
400
10
10
0.3
3
2.6
V
V
A
mA
ns
ns
Note 1: The MAX5075 is 100% tested at TA = TJ = +125°C. All limits over temperature are guaranteed by design.
Note 2: Use the following formula to calculate the MAX5075 oscillator frequency: fOSC = 1012/(32 x RRT).
Note 3: The accuracy of the oscillator’s frequency is lower at frequencies greater than 1MHz.
2 _______________________________________________________________________________________


Part Number MAX5075
Description Push-Pull FET Driver
Maker Maxim Integrated Products
Total Page 8 Pages
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