MAX5074AUP+
MAX5074AUP+ Datasheet
MAX5074
| Part | Datasheet |
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MAX5074AUP+ |
MAX5074AUP+ (pdf) |
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MAX5074AUP+T |
MAX5074AUP+T |
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| EVALUATION KIT AVAILABLE Power IC with Integrated MOSFETs for Isolated IEEE 802.3af PD and Telecom Power-Supply Applications MAX5074 The MAX5074 isolated PWM power IC features integrated switching power MOSFETs connected in a voltageclamped, two-transistor, power-circuit configuration. This device can be used in both forward and flyback configurations with a wide input voltage range from 11V to 76V and up to 15W of output power. The voltage-clamped power topology enables full recovery of stored magnetizing and leakage inductive energy for enhanced efficiency and reliability. A lookahead signal for driving secondary-side synchronous rectifiers can be used to increase efficiency. A wide array of protection features includes UVLO, overtemperature shutdown, and short-circuit protection with hiccup current limit for enhanced performance and reliability. Operation up to 500kHz allows smaller external magnetics and capacitors. The MAX5074 is rated for operation over the -40°C to +125°C temperature range and is available in a 20-pin TSSOP package. Warning The MAX5074 is designed to work with high voltages. Exercise caution. IEEE 802.3af PD Power Supplies Isolated IP Phone Power Supplies High-Efficiency Telecom/Datacom Power Supplies 48V Input, Isolated Power-Supply Modules WLAN Access-Point Power Supplies ADSL Line Cards ADSL Line-Driver Power Supplies Distributed Power Systems with 48V Bus Pin Configuration TOP VIEW REGOUT 1 RTCT 2 FLTINT 3 RCFF 4 RAMP 5 OPTO 6 CSS 7 PPWM 8 GND 9 CS 10 MAX5074 20 INBIAS 19 HVIN 18 UVLO 17 BST 16 DRNH 15 XFRMRH 14 DRVIN 13 XFRMRL 12 SRC 11 PGND TSSOP Clamped, Two-Switch Power IC for High Efficiency No Reset Winding Required Up to 15W Output Power Bias Voltage Regulator with Automatic High- Voltage Supply Turn-Off 11V to 76V Wide Input Voltage Range Integrated High-Voltage Power MOSFETs Feed-Forward Voltage-Mode Control For Fast Input Transient Rejection Programmable Brownout Undervoltage Lockout Internal Overtemperature Shutdown Indefinite Short-Circuit Protection With Programmable Fault Integration Integrated Look-Ahead Signal for Secondary-Side Synchronous Rectification >90% Efficiency with Synchronous Rectification Up to 500kHz Switching Frequency High-Power 1.74W , Small-Footprint 20-Pin Thermally Enhanced TSSOP Package PART MAX5074AUP *EP = Exposed pad. Ordering Information TEMP RANGE -40°C to +125°C PIN-PACKAGE 20-TSSOP-EP* Simplified Application Circuit CIN DRNH DRVH XFRMRH MAX5074 XFRMRL DRVL VOUT COUT Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at Power IC with Integrated MOSFETs for Isolated IEEE 802.3af PD and Telecom Power-Supply Applications MAX5074 ABSOLUTE MAXIMUM RATINGS HVIN, INBIAS, DRNH, XFRMRH, XFRMRL to +80V BST to GND to +95V BST to XFRMRH to +12V PGND to GND to +0.3V UVLO, RAMP, CSS, OPTO, FLTINT, RCFF, RTCT to +12V SRC, CS to +6V REGOUT, DRVIN to GND to +12V REGOUT to HVIN to +0.3V REGOUT to INBIAS to +0.3V REGOUT Current PPWM to REGOUT + 0.3V PPWM Current DRNH, XFRMRH, XRFMRL, SRC Continuous Current Average TJ = TJ = Continuous Power Dissipation TA = +70°C 20-Pin TSSOP-EP derate 21.7mW/°C above +70°C ....1.739W 20-Pin TSSOP-EP Operating Temperature Range .........................-40°C to +125°C Maximum Junction Temperature Storage Temperature Range .............................-60°C to +150°C Lead Temperature soldering, 10s .................................+300°C 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 VHVIN = 12V, CINBIAS = 1µF, CREGOUT = 2.2µF, RRTCT = CRTCT = 100pF, CBST = 0.22µF, VCSS = VCS = 0V, VRAMP = VUVLO = 3V, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C, unless otherwise noted. Note 1 PARAMETER Input Supply Range OSCILLATOR RTCT PWM Frequency Maximum PWM Duty Cycle Maximum RTCT Frequency RTCT Peak Trip Level SYMBOL VHVIN CONDITIONS fS DMAX fRTCTMAX RRTCT = CRTCT = 100pF RRTCT = CRTCT = 100pF Note 2 RTCT Valley Trip Level RTCT Input Bias Current RTCT Discharge MOSFET RDS ON RTCT Discharge Pulse Width LOOK-AHEAD LOGIC PPWM PPWM to XFRMRL Output Propagation Delay tPPWM PPWM Output High PPWM Output Low PWM COMPARATOR OPTO, RAMP, RCFF Common-Mode Range VCM-PWM Input Offset Voltage Input Bias Current RAMP to XFRMRL Propagation Delay Minimum OPTO Voltage Minimum RCFF Voltage Sinking 20mA PPWM rising to XFRMRL falling Sourcing 2mA Sinking 2mA From RAMP 50mV overdrive rising to XFRMRL rising VCSS = 0V, OPTO sinking 2mA RCFF sinking 2mA |
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