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MAX774 Dataheets PDF



Part Number MAX774
Manufacturers Maxim
Logo Maxim
Description -5V/-12V/-15V or Adjustable / High-Efficiency / Low IQ Inverting DC-DC Controllers
Datasheet MAX774 DatasheetMAX774 Datasheet (PDF)

MAX774/MAX775/MAX776 19-0191; Rev 2; 12/02 EVAALVUAAILTAIOBNLEKIT -5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-to-DC Controllers General Description The MAX774/MAX775/MAX776 inverting switching regulators deliver high efficiency over three decades of load current. A unique current-limited, pulsefrequency modulated (PFM) control scheme provides the benefits of pulse-width modulation (high efficiency with heavy loads), while using less than 100µA of supply current (vs. 2mA t.

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MAX774/MAX775/MAX776 19-0191; Rev 2; 12/02 EVAALVUAAILTAIOBNLEKIT -5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-to-DC Controllers General Description The MAX774/MAX775/MAX776 inverting switching regulators deliver high efficiency over three decades of load current. A unique current-limited, pulsefrequency modulated (PFM) control scheme provides the benefits of pulse-width modulation (high efficiency with heavy loads), while using less than 100µA of supply current (vs. 2mA to 10mA for PWM converters). The result is high efficiency over a wide range of loads. These ICs also use tiny external components; their high switching frequency (up to 300kHz) allows for less than 5mm diameter surface-mount magnetics. The MAX774/MAX775/MAX776 accept input voltages from 3V to 16.5V, and have preset output voltages of -5V, -12V, and -15V, respectively. Or, the output voltage can be user-adjusted with two resistors. Maximum VIN - VOUT differential voltage is limited only by the breakdown voltage of the chosen external switch transistor. These inverters use external P-channel MOSFET switches, allowing them to power loads up to 5W. If less power is required, use the MAX764/MAX765/MAX766 inverting switching regulators with on-board MOSFETs. Applications LCD-Bias Generators High-Efficiency DC-to-DC Converters Battery-Powered Applications Data Communicators Features o 85% Efficiency for 5mA to 1A Load Currents o Up to 5W Output Power o 100µA (max) Supply Current o 5µA (max) Shutdown Current o 3V to 16.5V Input Range o -5V (MAX774), -12V (MAX775), -15V (MAX776), or Adjustable Output Voltage o Current-Limited PFM Control Scheme o 300kHz Switching Frequency Ordering Information PART MAX774CPA MAX774CSA MAX774C/D MAX774EPA MAX774ESA MAX774MJA TEMP RANGE 0°C to +70°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C -55°C to +125°C *Contact factory for dice specifications. PIN-PACKAGE 8 Plastic DIP 8 SO Dice* 8 Plastic DIP 8 SO 8 CERDIP Ordering Information continued on last page. Typical Operating Circuit INPUT 3V TO 16V V+ ON/OFF MAX774 SHDN CS EXT FB REF OUT GND P OUTPUT -5V TOP VIEW Pin Configuration OUT 1 FB 2 SHDN 3 REF 4 MAX774 MAX775 MAX776 DIP/SO 8 GND 7 EXT 6 CS 5 V+ ________________________________________________________________ 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 www.maxim-ic.com. MAX774/MAX775/MAX776 -5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-to-DC Controllers ABSOLUTE MAXIMUM RATINGS Supply Voltages V+ to OUT ...........................................................................21V V+ to GND ..............................................................-0.3V, +17V OUT to GND ........................................................-0.3V, to -17V REF, SHDN, FB, CS...................................-0.3V to (V+ + 0.3V) EXT ...............................................(VOUT - 0.3V) to (V+ + 0.3V) Continuous Power Dissipation (TA = +70°C) Plastic DIP (derate 9.09mW/°C above +70°C) .............727mW SO (derate 5.88mW/°C above +70°C) ..........................471mW CERDIP (derate 8.00mW/°C above +70°C) ..................640mW Operating Temperature Ranges: MAX77_C_ _ .........................................................0°C to +70°C MAX77_E_ _ ......................................................-40°C to +85°C MAX77_MJA ...................................................-55°C to +125°C Maximum Junction Temperatures: MAX77_C_ _/E_ _ ...........................................................+150°C MAX77_MJA..................................................................+175°C Storage Temperature Range .............................-65°C to +160°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 (V+ = 5V, ILOAD = 0mA, CREF = 0.1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX V+ Input Voltage Range V+ 3.0 16.5 V+ = 16.5V, SHDN ≤ 0.4V (operating) 100 Supply Current V+ = 10V, SHDN ≥ 1.6V (shutdown) 25 V+ = 16.5V, SHDN ≥ 1.6V (shutdown) 4 FB Trip Point 3V ≤ V+ ≤ 16.5V -10 10 MAX77_C ±50 FB Input Current IFB MAX77_E MAX77_M ±70 ±90 MAX774 -4.80 -5 -5.20 Output Voltage VOUT MAX775 MAX776 -11.52 -14.40 -12 -12.48 -15 -15.60 MAX77_C 1.4700 1.5 1.5300 Reference Voltage VREF IREF = 0µA MAX77_E MAX77_M 1.4625 1.4550 1.5 1.5375 1.5 1.5450 REF Load Regulation 0µA ≤ IREF ≤ 100µA .


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