Features: * High Efficiency for a Wide Range of Load Currents
* 12V/150mA Flash Memory Programming Supply
* 110A Max Supply Current
* 5A Max Shutdown Supply Current
* 2V to 16.5V Input Voltage Range
* 12V (MAX761), 15V (MAX762) or Adjustable Output
* Current-Limited PFM Control Scheme
* 300kHz Switching Frequency
* Internal, 1A, N-Channel Power FET
* LBI/LBO Low-Battery ComparatorApplicationFlash Memory Programming
PCMCIA Cards
Battery-Powered Applications
High-Efficiency DC-DC ConvertersPinout
SpecificationsSupply Voltage V+ to GND .......................................-0.3V to 17V
REF, LBO, LBI, SHDN, FB ............................ .-0.3V to (V+ + 0.3V)
LX..............................................................................-0.3V to 17V
LX Peak Current....................................................................1.5A
LBO Current...........................................................................5mA
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:
MAX76_C_A..........................................................0°C to +70°C
MAX76_E_A ......................................................-40°C to +85°C
MAX76_MJA ....................................................-55°C to +125°C
Junction Temperatures:
MAX76_C_A/E_A..........................................................+150°C
MAX76_MJA.................................................................+175°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°CDescriptionThe MAX761/MAX762 step-up switching regulators provide high efficiency over a wide range of load currents, delivering up to 150mA. A unique, current-limited pulse-frequency-modulated (PFM) control scheme gives the MAX761 the benefits of pulse-width-modulated (PWM) ,converters (high efficiency with heavy loads), while using less than 110A of supply current (vs. 2mA to 10mA for PWM converters). The result is high efficiency over a wide range of loads.
The MAX761/MAX762 input voltage range is 2V to 16.5V. Output voltages are preset to 12V (MAX761) and 15V (MAX762), or they can be set with two external resistors. With a 5V input, the MAX761 guarantees a 12V, 150mA output. Its high efficiency, low supply current, fast start-up time, SHDN controlling capability, and small size make the MAX761 ideal for powering flash memory.
The MAX761/MAX762 have an internal 1A power MOSFET, making them ideal for minimum-component, low- and medium-power applications. These devices use tiny external components, and their high switching frequencies (up to 300kHz) allow for small surface-mount magnetics. For increased output drive capability or higher output voltages, use the MAX770MAX773, which are similar in design to the MAX761/MAX762, but drive external power MOSFETs. For stepping up to 5V, see the MAX756/ MAX757 and MAX856-MAX859 data sheets.
MAX761 Data Sheet
