MAX5075 19-3662 Rev 1 5/07 Push-Pull FET Driver with Integrated Oscillator and Clock Output General Description Features The MAX5075 is a +4.5V to +15V push-pull, current-fed Current-Fed, Push-Pull Driver Subsystem topology driver subsystem with an integrated oscillator Programmable, Accurate Internal Oscillator for use in telecom module power supplies. The device drives two MOSFETs connected to a center-tapped Single +4.5V to +15V Supply Voltage Range transformer primary providing secondary-side, isolated, Dual 3A Gate-Drive Outputs negative or positive voltages. This device features a pro- grammable, accurate, integrated oscillator with a syn- 1mA Operating Current at 250kHz with No chronizing clock output that synchronizes an external Capacitive Load PWM regulator. A single external resistor programs the Synchronizing Clock Frequency Generation internal oscillator frequency from 50kHz to 1.5MHz. Options The MAX5075 incorporates a dual MOSFET driver with 3A peak drive currents and 50% duty cycle. The Thermally Enhanced 8-Pin MAX Package MOSFET driver generates complementary signals to -40C to +125C Operating Temperature Range 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 Ordering Information MAX5075 is available in a thermally enhanced 8-pin MAX package and is specified over the -40C to PIN- TOP PKG f /f CLK NDRV PART +125C operating temperature range. PACKAGE MARK CODE RATIO MAX5075AAUA 8 MAX-EP* AAAU U8E-2 1 Applications MAX5075BAUA 8 MAX-EP* AAAV U8E-2 2 Current-Fed, High-Efficiency Power-Supply Modules MAX5075CAUA 8 MAX-EP* AAAW U8E-2 4 Power-Supply Building Subsystems *EP = Exposed paddle. Push-Pull Driver Subsystems Note: All devices specified for -40C to +125C operating MAX is a registered trademark of Maxim Integrated Products, Inc. temperature range. Pin Configuration appears at end of data sheet. Typical Operating Circuit V IN V IN V OUT DRVH PWM V CC CONTROLLER V CC NDRV2 SYNCIN CLK MAX5075 NDRV1 RT DRVL 4.7k I.C. PGND GND 1nF GND Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.Push-Pull FET Driver with Integrated Oscillator and Clock Output ABSOLUTE MAXIMUM RATINGS V to DGND, PGND .............................................-0.3V to +18V Continuous Power Dissipation (T = +70C) CC A CLK, RT to DGND.....................................................-0.3V to +6V 8-Pin MAX (derate 10.3mW/C above +70C) ...........825mW NDRV1, NDRV2 to PGND...........................-0.3V to (V + 0.3V) Operating Temperature Range .........................-40C to +125C CC DGND to PGND.....................................................-0.3V to +0.3V Maximum Junction Temperature .....................................+150C CLK Current......................................................................20mA Storage Temperature Range .............................-60C to +150C NDRV1, NDRV2 Peak Current (200ns)..................................5A Lead Temperature (soldering, 10s) .................................+300C NDRV1, NDRV2 Reverse Current (Latchup Current)......500mA 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 (V = +12V, R = 124k, NDRV1 = NDRV2 = open, T = T = -40C to +125C, unless otherwise noted. Typical values are measured CC RT A J at T = +25C.) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SUPPLY Input Voltage Supply Range V 4.5 15.0 V CC Switching Supply Current I f = 250kHz 1 3 mA CCSW OSC Undervoltage Lockout V V rising 3 3.5 4 V UVLO CC UVLO Hysteresis 300 mV OSCILLATOR Frequency Range f (Note 2) 50 1500 kHz OSC Accuracy f = 250kHz , 6V V 15V (Note 3) -8 +10 % OSC CC Oscillator Jitter 0.6 % 7V V 15V 3.9 5.0 CC CLK Output High Voltage I = 1mA V CLK 4.5V V 7V 3.35 5.0 CC CLK Output Low Voltage I = -1mA 50 mV CLK CLK Output Rise Time C = 30pF 35 ns CLK CLK Output Fall Time C = 30pF 10 ns CLK GATE DRIVERS (NDRV1, NDRV2) V - CC Output High Voltage V I = I = 100mA V OH NDRV1 NDRV2 0.3 Output Low Voltage V I = I = -100mA 0.3 V OL NDRV1 NDRV2 Output Peak Current I Sourcing and sinking 3 A P NDRV sourcing 100mA 1.8 3 Driver Output Impedance NDRV sinking 100mA 1.6 2.6 Latchup Current Protection Reverse current at NDRV1/NDRV2 400 mA Rise Time t C = 2nF 10 ns R LOAD Fall Time t C = 2nF 10 ns F LOAD Note 1: The MAX5075 is 100% tested at T = T = +125C. All limits over temperature are guaranteed by design. A J 12 Note 2: Use the following formula to calculate the MAX5075 oscillator frequency: f = 10 /(32 x R ). OSC RT Note 3: The accuracy of the oscillators frequency is lower at frequencies greater than 1MHz. 2 MAX5075