The MAX770MAX773 step-up switching controllers provide 90% efficiency over a 10mA to 1A load. A unique current-limited pulse-frequency-modulation (PFM) control scheme gives these devices the benefits of pulse-width-modulation (PWM) converters (high efficiency at heavy loads), while using less than 110A of supply current (vs. 2mA to 10mA or PWM converters).
These ICs use tiny external components. Their high switching frequencies (up to 300kHz) allow surfacemount magnetics of 5mm height and 9mm diameter.
The MAX770/MAX771/MAX772 accept input voltages from 2V to 16.5V. Output voltages are preset at 5V, (MAX770), 12V (MAX771), and 15V (MAX772); they can also be adjusted using two resistors.
The MAX773 accepts inputs from 3V to 16.5V. For a wider input range, it features an internal shunt regulator that allows unlimited higher input voltages. The MAX773's output can be set to 5V, 12V, or 15V, or it can be adjusted with two resistors.
The MAX770MAX773 drive external N-channel MOSFET switches, allowing them to power loads up to 15W. If less power is required, use the MAX756/MAX757 or MAX761/MAX762 step-up switching regulators with onboard MOSFETs.
ABSOLUTE MAXIMUM RATINGS
Supply Voltages
V+ to GND............................................................-0.3V to 17V
V+ to SGND............................................................-0.3V to 7V
SGND........................................................-0.3V to (V+ + 0.3V)
EXT, CS, REF, LBO, LBI, SHDN, FB.............-0.3V to (V+ + 0.3V)
EXTH, EXTL ..............................................-0.3V to (V+ + 0.3V)
V5, V12, V15 ........................................................-0.3V to 17V
GND to AGND ......................................................0.1V to -0.1V
ISGND .............................................................................50mA
Continuous Power Dissipation (TA = +70°C)
8-Pin Plastic DIP (derate 9.09mW/°C above +70°C)..727mW
8-Pin SO (derate 5.88mW/°C above +70°C) .............471mW
8-Pin CERDIP (derate 8.00mW/°C above +70°C) ......640mW
14-Pin Plastic DIP
(derate 10.00mW/°C above +70°C) ..........................800mW
14-Pin SO (derate 8.33mW/°C above +70°C) ...........667mW
14-Pin CERDIP (derate 9.09mW/°C above +70°C).....727mW
Operating Temperature Ranges
MAX77_C__ ......................................................0°C to +70°C
MAX77_E__....................................................-40°C to +85°C
MAX77_MJ_ .................................................-55°C to +125°C
Junction Temperatures
MAX77_C__/E__ .........................................................+150°C
MAX77_MJ_..................................................................+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
Required Field 
