EVALUATION KIT AVAILABLE MAX13253 1A, Spread-Spectrum, Push-Pull, Transformer Driver for Isolated Power Supplies General Description Features and Benefits Simple, Flexible Design The MAX13253 is a 1A, push-pull, transformer driver designed to provide a simple solution for low-EMI isolated +3.0V to +5.5V Supply Range power supplies. The MAX13253 has an internal oscillator Low R 300m (max) at 4.5V ON and operates from a single +3.0V to +5.5V supply. The Up to 90% Efficiency transformers secondary-to-primary winding ratio defines Provides Up to 1A to the Transformer the output voltage, allowing selection of virtually any iso- lated output voltage with galvanic isolation. Internal or External Clock Source The MAX13253 features an integrated oscillator driving Internal Oscillator Frequency: 250kHz or 600kHz a pair of n-channel power switches. The driver includes Optional Spread-Spectrum Oscillation pin-selectable spread-spectrum oscillation and a well- -40C to +125C Temperature Range controlled slew rate to reduce EMI. The MAX13253 can Integrated System Protection optionally be driven by an external clock to further man- age EMI. Internal circuitry guarantees a fixed 50% duty Fault Detection and Indication cycle to prevent DC current flow through the transformer, Overcurrent Limiting regardless of which clock source is used. Undervoltage Lockout The MAX13253 operates with up to 1A of continuous Thermal Shutdown current and features integrated protection including fault Saves Space on Board detection, overcurrent protection, and thermal shutdown. Small 10-Pin TDFN Package (3mm x 3mm) The MAX13253 includes a low-current shutdown mode to reduce the overall supply current to less than 5A (max) Applications when the driver is disabled. Power Meter Data Interface The MAX13253 is available in a small 10-pin (3mm x Isolated Fieldbus Interface 3mm) TDFN package and is specified over the -40C to Medical Equipment +125C temperature range. Isolated Analog Front-End Isolated USB Power Ordering Information appears at end of data sheet. Typical Operating Circuit 5V 1F V DD T2 HICLK 1CT:1.3CT SPRD ISOLATED 1F FAULT V OUT MAX13253 10F EN CLK T1 GND PGND For related parts and recommended products to use with this part, refer to www.maximintegrated.com/MAX13253.related. 19-6600 Rev 1 4/13MAX13253 1A, Spread-Spectrum, Push-Pull, Transformer Driver for Isolated Power Supplies Absolute Maximum Ratings (All voltages referenced to GND.) TDFN (Single-Layer Board) V , FAULT, CLK, HICLK, SPRD, EN....................-0.3V to +6V (derate 18.5mW/C above +70C) ..........................1481.5mW DD T1, T2 .................................................................-0.3V to +16.5V Operating Temperature Range ..........................-40C to +125C T1, T2 Maximum Continuous Current ..............................+1.75A Junction Temperature ......................................................+150C FAULT Maximum Continuous Current .............................+50mA Storage Temperature Range .............................-65C to +150C Continuous Power Dissipation (T = +70C) Lead Temperature (soldering, 10s) .................................+300C A TDFN (Multilayer Board) Soldering Temperature (reflow) .......................................+260C (derate 24.4mW/C above +70C) ..........................1951.2mW Package Thermal Characteristics (Note 1) TDFN (Multilayer) TDFN (Single Layer) Junction-to-Ambient Thermal Resistance ( ) ..........41C/W Junction-to-Ambient Thermal Resistance ( ) ..........54C/W JA JA Junction-to-Case Thermal Resistance ( ) .................9C/W Junction-to-Case Thermal Resistance ( ) .................9C/W JC JC Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. 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 = +3.0V to +5.5V, T = T to T , unless otherwise noted. Typical values are at V = +5.0V and T = +25C.) (Note 2) DD A MIN MAX DD A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC CHARACTERISTICS Supply Voltage Range V 3.0 5.5 V DD V = 0V, V = 0V, V = 0V 1.1 1.8 EN CLK HICLK Supply Current I V = 0V, T1 and T2 mA DD SPRD V = V 2.1 3.5 not connected HICLK DD V = V , T1, T2, CLK, SPRD, HICLK EN DD Disable Supply Current I 5 A DIS connected to GND or V (Note 3) DD V = 3.0V 160 350 DD Driver Output Resistance R I = 500mA m O OUT V = 4.5V 145 300 DD Undervoltage Lockout V V rising 2.6 2.75 2.9 V UVLO DD Threshold Undervoltage Lockout V 250 mV UVLO HYST Threshold Hysteresis 3.0V < V < 3.6V 1.1 1.3 1.5 DD T1, T2 Current Limit I A LIM 4.5V < V < 5.5V 1.2 1.4 1.6 DD T1, T2 Leakage Current I V = V , V = 0V T1, T2 = 0V or V -1 +1 A LKG EN DD CLK DD Maxim Integrated 2 www.maximintegrated.com