MAX5077 19-3663 Rev 1 6/07 Push-Pull FET Driver with Integrated Oscillator and Programmable Clock Output General Description Features The MAX5077 is a +4.5V to +15V push-pull, current-fed Dedicated Current-Fed, Push-Pull Driver topology driver subsystem with an integrated oscillator Subsystem used in telecom module power supplies. The device Oscillator Frequency Programmable from 50kHz drives two MOSFETs connected to a center-tapped transformer primary providing secondary-side, isolated, to 1.5MHz negative or positive voltages. The MAX5077 features a Single +4.5V to +15V Supply Voltage Range programmable accurate integrated oscillator with a 3A Peak Gate-Drive Current synchronizing clock output to synchronize an external PWM regulator. A single external resistor programs the 1mA Operating Current at 250kHz with No internal oscillator frequency from 50kHz to 1.5MHz. Capacitive Load The MAX5077 incorporates dual MOSFET drivers with Selectable Synchronizing Clock Frequency for a 3A peak drive currents and 50% duty cycle. The Preceding PWM Stage MOSFET drivers generate complementary signals to drive external ground-referenced n-channel MOSFETs. Thermally Enhanced 14-Pin TSSOP The MAX5077 clock output frequency is programmable -40C to +125C Operating Temperature Range by logic inputs to set the clock output to 1x, 2x, or 4x the MOSFETs driver frequency. The MAX5077 is available in a 14-pin exposed pad Ordering Information TSSOP package and is specified over the -40C to +125C operating temperature range. PKG PART TEMP RANGE PIN-PACKAGE CODE Applications MAX5077AUD -40C to +125C 14 TSSOP-EP* U14E-3 Current-Fed Power Supplies *EP = Exposed paddle. Power-Supply Building Subsystems Pin Configuration appears at end of data sheet. Push-Pull Driver Subsystems Typical Operating Circuit V IN V OUT V IN DRVH SYNCIN CLK PWM V CC CONTROLLER MAX5077 V CC NDRV2 SEL1 I.C. NDRV1 RT SEL2 DRVL 4.7k AGND DGND GND PGND 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 Programmable Clock Output ABSOLUTE MAXIMUM RATINGS V to AGND, DGND, PGND.................................-0.3V to +18V Continuous Power Dissipation (T = +70C) CC A PGND, DGND to AGND ........................................-0.3V to +0.3V 14-Pin TSSOP (derate 20.8mW/C above +70C) .....1667mW SEL1, SEL2 to DGND .............................................-0.3V to +18V Operating Temperature Range .........................-40C to +125C CLK, RT to AGND.....................................................-0.3V to +6V Maximum Junction Temperature .....................................+150C NDRV1, NDRV2 to PGND...........................-0.3V to (V + 0.3V) Storage Temperature Range .............................-60C to +150C CC CLK Current......................................................................20mA Lead Temperature (soldering, 10s) .................................+300C NDRV1, NDRV2 Peak Current (200ns)..................................5A 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, SEL1 = V , SEL2 = DGND, R = 124k , NDRV1 = NDRV2 = open, T = T = -40C to +125C, unless otherwise CC CC RT A J noted. Typical values are 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 Static Supply Current I SEL2 = SEL1 = DGND, drivers not switching 150 320 A CCST Switching Supply Current I SEL2 = DGND, SEL1 = V , f = 250kHz 13 mA CCSW CC OSC Undervoltage Lockout V V rising 3 3.5 4V 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 2 MAX5077