MAX5075_07 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – Push-Pull FET Driver with Integrated Oscillator and Clock Output

19-3662; Rev 1; 5/07
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 f_CLK/f_{NDRV_}
PACKAGE MARK CODE RATIO
MAX5075AAUA 8 µMAX-EP* AAAU U8E-2
1
MAX5075BAUA 8 µMAX-EP* AAAV U8E-2
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
V_IN
V_IN
V_OUT
DRVH
PWM
CONTROLLER
SYNCIN
DRVL
GND
GND
V_CC
V_CC
NDRV2
4.7kΩ
1nF
CLK _MAX5075
NDRV1
RT
I.C. PGND
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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.