MAX764/MAX765/MAX766 19-0176 Rev 0 6/94 -5V/-12V/-15V or Adjustable, High-Efficiency, Low I DC-DC Inverters Q General Description Features The MAX764/MAX765/MAX766 inverting switching regu- High Efficiency for a Wide Range of Load Currents lators are highly efficient over a wide range of load cur- 250mA Output Current rents, delivering up to 1.5W. A unique, current-limited, pulse-frequency-modulated (PFM) control scheme com- 120A Max Supply Current bines the benefits of traditional PFM converters with the 5A Max Shutdown Current benefits of pulse-width-modulated (PWM) converters. Like PWM converters, the MAX764/MAX765/MAX766 are 3V to 16V Input Voltage Range highly efficient at heavy loads. Yet because they are PFM -5V (MAX764), -12V (MAX765), -15V (MAX766), devices, they use less than 120A of supply current (vs. 2mA to 10mA for a PWM device). or Adjustable Output from -1V to -16V The input voltage range is 3V to 16V. The output volt- Current-Limited PFM Control Scheme age is preset at -5V (MAX764), -12V (MAX765), or -15V 300kHz Switching Frequency (MAX766) it can also be adjusted from -1V to -16V TM using two external resistors (Dual Mode ). The maxi- Internal, P-Channel Power MOSFET mum operating V - V differential is 20V. IN OUT These devices use miniature external components their Ordering Information high switching frequencies (up to 300kHz) allow for less PART TEMP. RANGE PIN-PACKAGE than 5mm diameter surface-mount magnetics. A stan- dard 47H inductor is ideal for most applications, so no MAX764CPA 0C to +70C 8 Plastic DIP magnetics design is necessary. MAX764CSA 0C to +70C 8 SO An internal power MOSFET makes the MAX764/MAX765/ MAX764C/D 0C to +70C Dice* MAX766 ideal for minimum component count, low- and MAX764EPA -40C to +85C 8 Plastic DIP medium-power applications. For increased output drive MAX764ESA -40C to +85C 8 SO capability or higher output voltages, use the MAX764MJA -55C to +125C 8 CERDIP** MAX774/MAX775/MAX776 or MAX1774, which drive an MAX765CPA 0C to +70C 8 Plastic DIP external power P-channel MOSFET for loads up to 5W. MAX765CSA 0C to +70C 8 SO Applications MAX765C/D 0C to +70C Dice* LCD-Bias Generators MAX765EPA -40C to +85C 8 Plastic DIP Portable Instruments MAX765ESA -40C to +85C 8 SO LAN Adapters MAX765MJA -55C to +125C 8 CERDIP** Remote Data-Acquisition Systems Ordering Information continued on last page. * Dice are tested at T = +25C, DC parameters only. Battery-Powered Applications A **Contact factory for availability and processing to MIL-STD-883. Pin Configuration Typical Operating Circuit INPUT TOP VIEW 3V TO 15V V+ OUTPUT LX -5V OUT 1 LX 8 MAX764 FB 2 7 V+ MAX764 47H ON/OFF SHDN MAX765 SHDN 3 6 V+ MAX766 REF 4 GND 5 OUT REF DIP/SO FB GND Maxim Integrated Products 1 Call toll free 1-800-998-8800 for free samples or literature. Evaluation Kit Available-5V/-12V/-15V or Adjustable, High-Efficiency, Low I DC-DC Inverters Q ABSOLUTE MAXIMUM RATINGS V+ to GND..............................................................-0.3V to +17V Operating Temperature Ranges OUT to GND ...........................................................+0.5V to -17V MAX76 C A ........................................................0C to +70C Maximum Differential (V+ to OUT) ......................................+21V MAX76 E A .....................................................-40C to +85C REF, SHDN, FB to GND ...............................-0.3V to (V+ + 0.3V) MAX76 MJA ..................................................-55C to +125C LX to V+..................................................................+0.3V to -21V Maximum Junction Temperatures LX Peak Current ...................................................................1.5A MAX76 C A/E A ..........................................................+150C Continuous Power Dissipation (T = +70C) MAX76 MJA .................................................................+175C A Plastic DIP (derate 9.09mW/C above +70C) ............727mW Storage Temperature Range ............................-65C to +160C SO (derate 5.88mW/C above +70C) .........................471mW Lead Temperature (soldering, 10sec) ............................+300C CERDIP (derate 8.00mW/C above +70C) .................640mW 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+ = 5V, I = 0mA, C = 0.1F, T = T to T , unless otherwise noted. Typical values are at T = +25C.) LOAD REF A MIN MAX A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS MAX76 C/E 3.0 16.0 V+ Input Voltage Range V+ V MAX76 M 3.5 Supply Current I V+ = 16V, SHDN < 0.4V 90 120 S V+ = 16V, SHDN > 1.6V 2 A Shutdown Current I SHDN V+ = 10V, SHDN > 1.6V 15 FB Trip Point 3V V+ 16V -10 10 mV MAX76 C 50 FB Input Current I MAX76 E 70 nA FB MAX76 M 90 MAX764, -4.8V V 5.2V 150 260 OUT MAX765C/E, -11.52V V 12.48V 68 120 OUT Output Current and Voltage I mA OUT (Note 1) MAX765M, -11.52V V 12.48V 50 120 OUT MAX766, -14.40V VOUT -15.60V 35 105 MAX76 C 1.4700 1.5 1.5300 Reference Voltage V MAX76 E 1.4625 1.5 1.5375 V REF MAX76 M 1.4550 1.5 1.5450 MAX76 C/E 410 REF Load Regulation 0A IREF 100A mV MAX76 M 415 REF Line Regulation 3V V+ 16V 40 100 V/V Load Regulation (Note 2) 0mA I 100mA 0.008 %/mA LOAD Line Regulation (Note 2) 4V V+ 6V 0.12 %/V V = -5V 80 10mA I 100mA, OUT LOAD Efficiency (Note 2) % VIN = 5V V = -15V 82 OUT SHDN Leakage Current V+ = 16V, SHDN = 0V or V+ 1 A SHDN Input Voltage High V 3V V+ 16V 1.6 V IH SHDN Input Voltage Low V 3V V+ 16V 0.4 V IL 2 MAX764/MAX765/MAX766