MAX774

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, 10sec) ...........................+300°C

Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device.  hese 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  onditions for extended periods may affect device reliability.

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 100A of supply current (vs. 2mA to 10mA for PWM converters). The result of MAX774 is high efficiency over a wide range of loads.

These ICs MAX774 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  ifferential voltage is limited only by the breakdown voltage of the chosen external switch transistor.

These inverters MAX774 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.