EVALUATION KIT AVAILABLE MAX1846/MAX1847 High-Efficiency, Current-Mode, Inverting PWM Controller General Description Features 90% Efficiency MAX1846/MAX1847 high-efficiency PWM inverting controllers allow designers to implement compact, low- +3.0V to +16.5V Input Range noise, negative-output DC-DC converters for telecom -500mV to -200V Output and networking applications. Both devices operate Drives High-Side P-Channel MOSFET from +3V to +16.5V input and generate -500mV to 100kHz to 500kHz Switching Frequency -200V output. To minimize switching noise, both devices feature a current-mode, constant-frequency PWM control Current-Mode, PWM Control scheme. The operating frequency can be set from 100kHz Internal Soft-Start to 500kHz through a resistor. Electrolytic or Ceramic Output Capacitor The MAX1846 is available in an ultra-compact 10-pin The MAX1847 also offers: MAX package. Operation at high frequency, com- Synchronization to External Clock Shutdown patibility with ceramic capacitors, and inverting topol- N-Channel Inverting Flyback Option ogy without transformers allow for a compact design. Compatibility with electrolytic capacitors and flexibility to Ordering Information operate down to 100kHz allow users to minimize the cost PART TEMP RANGE PIN-PACKAGE of external components. The high-current output drivers MAX1846EUB -40 C to +85 C 10 MAX are designed to drive a P-channel MOSFET and allow the MAX1846EUB+ -40 C to +105 C 10 MAX converter to deliver up to 30W. MAX1847EEE -40 C to +85 C 16 QSOP The MAX1847 features clock synchronization and shut- down functions. The MAX1847 can also be configured to MAX1847EEE+ -40 C to +85 C 16 QSOP operate as an inverting flyback controller with an N-channel +Denotes a lead(Pb)-free/RoHS-compliant package. MOSFET and a transformer to deliver up to 70W. The MAX1847 is available in a 16-pin QSOP package. Typical Operating Circuit Current-mode control simplifies compensation and POSITIVE provides good transient response. Accurate current-mode V IN control and over current protection are achieved through low-side current sensing. P NEGATIVE Applications V OUT Cellular Base Stations VL IN Networking Equipment EXT Optical Networking Equipment MAX1846 SLIC Supplies MAX1847 CO DSL Line Driver Supplies COMP CS Industrial Power Supplies Servers FREQ PGND VOIP Supplies REF FB GND Pin Configurations appear at end of data sheet. MAX is a registered trademark of Maxim Integrated Products, Inc. 19-2091 Rev 4 7/16MAX1846/MAX1847 High-Efficiency, Current-Mode, Inverting PWM Controller Absolute Maximum Ratings IN, SHDN to GND .................................................-0.3V to +20V Continuous Power Dissipation (T = +70C) A PGND to GND ......................................................-0.3V to +0.3V 10-Pin MAX (derate 5.6mW/C above +70C) ..........444mW VL to PGND for VIN 5.7V ........................-0.3V to (V + 0.3V) 16-Pin QSOP (derate 8.3mW/C above +70C)..........696mW IN VL to PGND for VIN > 5.7V .....................................-0.3V to +6V Operating Temperature Range ......................... -40C to +105C EXT to PGND .............................................-0.3V to (V + 0.3V) Junction Temperature ......................................................+150C IN REF, COMP to GND ....................................-0.3V to (VL + 0.3V) Storage Temperature Range ............................ -65C to +150C CS, FB, FREQ, POL, SYNC to GND ......................-0.3V to +6V Lead Temperature (soldering, 10s) .................................+300C Soldering Temperature (reflow) Lead(Pb)-free...............................................................+260C Containing lead(Pb) .....................................................+240C 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 = V = +12V, SYNC = GND, PGND = GND, R = 147k 1%, C = 0.47F, C = 0.1F, T = 0C to +85C, SHDN IN FREQ VL REF A unless otherwise noted.) PARAMETER CONDITIONS MIN TYP MAX UNITS PWM CONTROLLER Operating Input Voltage Range 3.0 16.5 V -40C to ~+85C 2.8 2.95 V rising IN -40C to ~+105C 2.8 2.96 V UVLO Threshold -40C to ~+85C 2.6 2.74 V falling IN -40C to ~+105C 2.59 2.74 UVLO Hysteresis 60 mV FB Threshold No load -12 0 12 mV FB Input Current V = -0.1V -50 -6 50 nA FB C = 0.068F, V = -48V, COMP OUT Load Regulation -1 0 % I = 20mA to 200mA (Note 1) OUT C = 0.068F, V = -48V, COMP OUT Line Regulation 0.04 % V = +8V to +16.5V, I = 100mA IN OUT Current-Limit Threshold 85 100 115 mV CS Input Current CS = GND 10 20 A Supply Current V = -0.1V, V = +3.0V to +16.5V 0.75 1.2 mA FB IN SHDN = GND, V = +3.0V to +16.5V IN Shutdown Supply Current 10 25 A V = +3.0V to +16.5V IN REFERENCE AND VL REGULATOR REF Output Voltage I = 50A 1.236 1.25 1.264 V REF REF Load Regulation I = 0 to 500A -2 -15 mV REF VL Output Voltage I = 100A 3.85 4.25 4.65 V VL VL Load Regulation I = 0.1mA to 2.0mA -20 -60 mV VL Maxim Integrated 2 www.maximintegrated.com