MAX5094A/B/C/D/MAX5095A/B/C 19-3864 Rev 3 10/06 High-Performance, Single-Ended, Current-Mode PWM Controllers General Description Features The MAX5094A/B/C/D/MAX5095A/B/C BiCMOS, high- Pin-for-Pin Replacement for UCC28C43 performance, current-mode PWM controllers have all the (MAX5094A) and UCC28C45 (MAX5094B) features required for wide input-voltage range 2A Drive Source and 1A Sink Capability isolated/nonisolated power supplies. These controllers Up to 1MHz Switching Frequency Operation are used for low- and high-power universal input volt- age and telecom power supplies. Bidirectional Frequency Synchronization (MAX5095A/MAX5095B) The MAX5094/MAX5095 contain a fast comparator with only 60ns typical delay from current sense to the output Advanced Output Drive for Secondary-Side for overcurrent protection. The MAX5094 has an inte- Synchronous Rectification (MAX5095C) grated error amplifier with the output at COMP. Soft- Fast 60ns Cycle-by-Cycle Current Limit start is achieved by controlling the COMP voltage rise using external components. Trimmed Oscillator Capacitor Discharge Current Sets Maximum Duty Cycle Accurately The oscillator frequency is adjustable from 20kHz to 1MHz with an external resistor and capacitor. The tim- Accurate 5% Start Voltage with 0.8V Hysteresis ing capacitor discharge current is trimmed allowing for Low 32A Startup Current programmable dead time and maximum duty cycle for 5V Regulator Output (REF) with 20mA Capability a given frequency. The available saw-toothed waveform at R C can be used for slope compensation when T T Versions with 0.3V Current-Sense Threshold needed. Overtemperature Shutdown The MAX5095A/MAX5095B include a bidirectional syn- Ordering Information chronization circuit allowing for multiple controllers to run at the same frequency to avoid beat frequencies. PIN- PKG PART TEMP RANGE Synchronization is accomplished by simply connecting PACKAGE CODE the SYNC of all devices together. When synchronizing MAX5094AASA -40C to +125C 8 SO S8-4 with other devices, the MAX5095A/MAX5095B with the highest frequency synchronizes the other devices. MAX5094AASA+ -40C to +125C 8 SO S8-4 Alternatively, the MAX5095A/MAX5095B can be syn- MAX5094AAUA* -40C to +125C 8 MAX U8-1 chronized to an external clock with an open-drain out- MAX5094AAUA+ -40C to +125C 8 MAX U8-1 put stage running at a higher frequency. MAX5094BASA* -40C to +125C 8 SO S8-4 The MAX5095C provides a clock output pulse MAX5094BASA+ -40C to +125C 8 SO S8-4 (ADV CLK) that leads the driver output (OUT) by MAX5094BAUA* -40C to +125C 8 MAX U8-1 110ns. The advanced clock signal is used to drive the secondary-side synchronous rectifiers. MAX5094BAUA+ -40C to +125C 8 MAX U8-1 The MAX5094A/B/C are available in the 8-pin SO and +Denotes lead-free package. 8-pin MAX packages. The MAX5094D and *Future productcontact factory for availability. MAX5095A/B/C are available in the 8-pin MAX pack- Ordering Information continued at end of data sheet. age. All devices operate over the automotive tempera- ture range of -40C to +125C. Pin Configurations Applications TOP VIEW Universal Input AC/DC Power Supplies COMP 1 8 REF Isolated Telecom Power Supplies FB 2 7 V CC Isolated Power-Supply Modules MAX5094 CS 3 6 OUT Networking Systems Computer Systems/Servers R /C 4 5 GND T T Industrial Power Conversion MAX/SO Isolated Keep-Alive Circuits Pin Configurations continued at end of data sheet. MAX is a registered trademark of Maxim Integrated Products, Inc. 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.High-Performance, Single-Ended, Current-Mode PWM Controllers ABSOLUTE MAXIMUM RATINGS V (Low-Impedance Source) to GND..................-0.3V to +30V Continuous Power Dissipation (T = +70C) CC A V (I < 30mA).....................................................Self Limiting 8-Pin MAX (derate 4.5mW/C above +70C) .............362mW CC CC OUT to GND ...............................................-0.3V to (V + 0.3V) 8-Pin SO (derate 5.9mW/C above +70C)...............470.6mW CC OUT Current.............................................................1A for 10s Operating Temperature Range .........................-40C to +125C FB, SYNC, COMP, CS, R /C , REF to GND .............-0.3V to +6V Maximum Junction Temperature .....................................+150C T T COMP Sink Current (MAX5094)..........................................10mA 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 = +15V, R = 10k , C = 3.3nF, REF = open, C = 0.1F, COMP = open, V = 2V, CS = GND, T = T = -40C to +85C, CC T T REF FB A J unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS REFERENCE Output Voltage V T = +25C, I = 1mA 4.950 5.000 5.050 V REF A REF Line Regulation V 12V V 25V, I = 1mA 0.4 4 mV LINE CC REF Load Regulation V 1mA I 20mA 6 25 mV LOAD REF Total Output Variation V 1mA I 20mA, 12V V 25V 4.9 5.1 V REFT REF CC Reference Output-Noise Voltage V 10Hz f 10kHz, T = +25C 50 V NOISE A Reference Output Short Circuit I V = 0V -30 -100 -180 mA S SC REF OSCILLATOR Initial Accuracy T = +25C 51 54 57 kHz A Voltage Stability 12V V 25V 0.2 0.5 % CC Temp Stability -40C T +85C 0.5 % A R /C Voltage Ramp ()V 1.7 V T T P-P RAMP R /C Voltage Ramp Valley V 1.1 V T T RAMP VALLEY V = 2V, T = +25C 7.9 8.3 8.7 RT/CT A Discharge Current I mA DIS V = 2V, -40C T +85C 7.5 8.3 9.0 RT/CT A Frequency Range f 20 1000 kHz OSC ERROR AMPLIFIER (MAX5094) FB Input Voltage V FB shorted to COMP 2.465 2.5 2.535 V FB FB Input Bias Current I -0.01 -0.1 A B(FB) Open-Loop Voltage Gain A 2V V 4V 100 dB VOL COMP Unity-Gain Bandwidth f 1 MHz GBW Power-Supply Rejection Ratio PSRR 12V V 25V (Note 2) 60 80 dB CC COMP Sink Current I V = 2.7V, V = 1.1V 2 6 mA SINK FB COMP COMP Source Current I V = 2.3V, V = 5V -0.5 -1.2 -1.8 mA SOURCE FB COMP COMP Output High Voltage V V = 2.3V, R = 15k to GND 5 5.8 V COMPH FB COMP COMP Output Low Voltage V V = 2.7V, R = 15k to REF 0.1 1.1 V COMPL FB COMP CURRENT-SENSE AMPLIFIER (MAX5094A/MAX5094B) 2.85 3 3.26 V/V Gain (Notes 3, 4) A CS (MAX5094C/D, MAX5095 ) 2.85 3 3.40 V/V 2 MAX5094A/B/C/D/MAX5095A/B/C