MAX765ESA-T

The MAX765ESA-T belongs to MAX764/MAX765/MAX766 inverting switching regulators family which are highly efficient over a wide range of load currents, delivering up to 1.5W. The input voltage range is 3V to 16V. The output volt- age is preset at -5V (MAX764), -12V (MAX765), or -15V (MAX766); MAX765ESA-T can also be adjusted from -1V to -16V using two external resistors (Dual Mode TM ). A unique, current-limited, pulse-frequency-modulated (PFM) control scheme combines the benefits of traditional PFM converters with the benefits of pulse-width-modulated (PWM) converters. Like PWM converters, the MAX764/MAX765/MAX766 are highly efficient at heavy loads. Yet because they are PFM devices, they use less than 120A of supply current (vs. 2mA to 10mA for a PWM device). A stan dard 47H inductor is ideal for most applications, so no magnetics design is necessary. An internal power MOSFET makes the MAX765ESA-T ideal for minimum component count, low and medium-power applications. For increased output drive capability or higher output voltages, use the MAX774/MAX775/MAX776 or MAX1774, which drive an external power P-channel MOSFET for loads up to 5W. The maximum operating VIN - VOUT differential is 20V. These MAX765ESA-T use miniature external components; their high switching frequencies (up to 300kHz) allow for less than 5mm diameter surface-mount magnetics.

The features of MAX765ESA-T can be summarized as (1)high efficiency for a wide range of load currents; (2)250mA output current; (3)120A max supply current; (4)5A max shutdown current; (5)3V to 16v input voltage range; (6)-5V (max764), -12v (max765), -15V (max766), or adjustable output from -1V to -16V; (7)current-limited PFM control scheme; (8)300khz switching frequency; (9)internal, p-channel power MOSFET.

The absolute maximum ratings of MAX765ESA-T are (1)V+ to GND: -0.3V to +17V; (2)OUT to GND: +0.5V to -17V; (3)maximum differential (V+ to OUT): +21V; (4)REF, SHDN, FB to GND: -0.3V to (V+ + 0.3V); (5)LX to V+: +0.3V to -21V; (6)LX peak current: 1.5A; (7)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; (8)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; (9)maximum junction temperatures MAX76_C_A/E_A: +150°C MAX76_MJA: +175°C; (10)storage temperature range: -65°C to +160°C; (11)lead temperature (soldering, 10sec): +300°C.