MAX5058/MAX5059 19-3045 Rev 0 10/03 EVALUATION KIT AVAILABLE Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs General Description Features The MAX5058/MAX5059 enable secondary-side syn- Clean Drive Waveforms for Synchronous chronous rectification in isolated power supplies using MOSFETs widely available power MOSFETs. These devices facili- Utilization of a Look-Ahead Signal from the tate the commutation of the secondary-side MOSFETs by providing a clean gate-drive signal that is synchronized Primary for Proper Turn-On/Turn-Off Times to the power MOSFET switching in the primary side of Synchronous Rectifier Drivers Capable of the isolation transformer. The MAX5058/MAX5059 com- Sourcing and Sinking Up to 2A Peak Current plement the MAX5051 and MAX5042/MAX5043 primary- side PWM ICs and enable the design of high-efficiency Internal Gate-Voltage Regulator for 5V (MAX5058) synchronously rectified isolated power supplies. or 10V (MAX5059) Gate-Drive Voltage Simultaneous conduction of the primary side and the Internal Error Amplifier freewheeling synchronous rectifier MOSFET is avoided by having a look-ahead signal (before the primary-side Accurate Differential Current-Share/Force Circuit MOSFETs turn ON), thus eliminating large current spikes Allows Paralleling of Several Power Supplies for resulting from a shorted transformer secondary. High Output Current An on-board error amplifier with a versatile current ref- Internal Remote Voltage-Sense Amplifier erence output enables virtually unlimited possibilities in Flexible Reference-Voltage Generation reference-voltage generation. Reference voltage for the error amplifier is generated by connecting an appropri- Output Voltage Regulation Down to 0.5V ate resistor to this output. Low Quiescent Current Consumption of 2.5mA Low on-resistance margining MOSFETs integrated on- chip allow for implementation of a margining circuit Integrated Digital Output Margining Circuit Saves without the use of external switches. The MAX5058 pro- External Parts and Board Space vides a 5V LDO output for logic-level MOSFETs while 30ns Propagation Delay Time from Pulse Input the MAX5059 provides a 10V LDO output for conven- to Output tional 10V MOSFETs. The MAX5058/MAX5059 are designed to enable paral- Automatic Detection of Discontinuous Current leling of multiple power supplies for accurate current Conduction and Turn-Off of the Freewheeling sharing using a simple 2-wire, differential, current-share MOSFET bus. Parallelability enables expansion of the power High Efficiency at Low Output Currents and capabilities and simplifies thermal management in high- Reverse-Current Protection output-current applications. When used in conjunction with the MAX5051, the primaries can also be synchro- Open-Drain Overtemperature Warning Flag nized and operated 180 degrees out of phase. 28-Pin Thermally Enhanced TSSOP Package The MAX5058/MAX5059 are available in a 28-pin ther- mally enhanced TSSOP package and operate over a wide -40C to +125C temperature range. Ordering Information Warning: The MAX5058/MAX5059 are designed to PIN- V work in circuits that contain high voltages. Exercise REG PART TEMP RANGE PACKAGE (V) caution. MAX5058AUI -40C to +125C 28 TSSOP-EP* 5 Applications MAX5058EUI -40C to +85C 28 TSSOP-EP* 5 Isolated Telecom Power Supplies MAX5059AUI -40C to +125C 28 TSSOP-EP* 10 Isolated Networking Power Supplies MAX5059EUI -40C to +85C 28 TSSOP-EP* 10 48V Power-Supply Modules *EP = Exposed paddle. Industrial Power Supplies 48V/12V Server Power Supplies Pin Configuration appears at end of data sheet. 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.Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs ABSOLUTE MAXIMUM RATINGS V+ to GND .............................................................-0.3V to +30V QREC, QSYNC Continuous Current....................................50mA PGND to GND .......................................................-0.3V to +0.3V QREC, QSYNC Current < 500ns..............................................5A COMPV, V , VDR, TSF to GND......................... -0.3V to +14V Continuous Power Dissipation (T = +70C) REG A All Other Pins to GND ..................................-0.3V to (VP + 0.3V) 28-Pin TSSOP (derate 23.8mW/C above +70C)...1905mW V Source Current .........................................................50mA Junction Temperature......................................................+150C REG COMPV, RMGU, RMGD, TSF Sink Current ....................... 30mA Operating Temperature Ranges VP to GND ................................................................-0.3V to +6V MAX5058EUI, MAX5059EUI ............................-40C to +85C VSO, CSO Source/Sink Current ......................................... 5mA MAX5058AUI, MAX5059AUI..........................-40C to +125C SFP Source Current ............................................................. 5mA Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C 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, GND = PGND = 0, VDR = V , C = C = 0, ZCP = ZCN = BUFIN = CSP = CSN = SFN = VSN = GND, V = REG QSYNC QREC IREF V = 1.785V, C = 2.2F, C = 1F, C = 0.1F, C = 68nF, T = T to T , unless otherwise noted. Typical values VSP VREG VP COMPS SFP A MIN MAX are at T = +25C.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS POWER SUPPLY MAX5058 4.5 28.0 Supply Voltage Range V+ V MAX5059 9.3 28.0 Quiescent Supply Current I 2.5 5 mA Q MAX5058 4.5 Switching Supply Current I f = 250kHz at BUFIN mA SW SW MAX5059 6 I : REFERENCE CURRENT OUTPUT REF Reference Current I V = 1.785V 49.2 50 51.1 A IREF IREF Reference Current Variation I V = 0.5V to 2.5V -0.1 +0.1 %/V IREF IREF Reference Voltage Compliance Guaranteed by reference current variation 0.5 2.5 V Range test V : LOW-DROPOUT REGULATOR REG MAX5058 4.75 5 5.25 Regulator Output V I = 0 to 30mA V VREG VREG MAX5059 9.4 10 10.6 MAX5058, V+ = 6V to 28V 25 Line Regulation mV MAX5059, V+ = 11V to 28V 25 V+ = 4.5V, MAX5058 200 350 I = 30mA VREG Dropout V mV DROP V+ = 9.3V, MAX5059 200 350 I = 30mA VREG VP: INTERNAL REGULATOR Regulator Output Setpoint V I = 0 to 5mA 3.8 4.3 V VP VP ZC: ZERO-CURRENT COMPARATOR Zero-Current Comparator V T = +25C +3.5 +5 +6.5 mV ZCTH A Threshold Zero-Current Comparator Input I -2.5 +2.5 A ZC Current 2 MAX5058/MAX5059