LM3311

If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.
V_IN .........................................................7.5V
SW Voltage .............................................21V
FB Voltage ................................................V_IN
V_C Voltage (Note 2)................ 1.265V ± 0.3V
SHDNVoltage .........................................7.5V
FREQ .........................................................V_IN
AV_IN .........................................................12V
Amplifier Inputs/Output Rail-to-Rail
LV_IN .........................................................7.5V
ADJ Voltage.............................................. LV_IN
V_OUT ........................................................LV_IN
VGH Voltage ..............................................31V
VGHM Voltage ...........................................VGH
VFLK, VDPM, V_DD Voltage .........................7.5V
CE Voltage (Note 2) ....................1.265 + 0.3V
RE Voltage ................................................VGH
Maximum Junction
Temperature .................................150°C
Power Dissipation(Note 3)..... Internally Limited
Lead Temperature ..................................300°C
Vapor Phase (60 sec.) ............................215°C
Infrared (15 sec.) ...................................220°C
ESD Susceptibility (Note 4)
Human Body Model ......................................2kV

The LM3311 is a step-up DC/DC converter integrated with an LDO, an Operational Amplifier, and a gate pulse modulation switch. The boost (step-up) converter is used to generate an adjustable output voltage and features a low R_DSON internal switch for maximum efficiency. The operating frequency is selectable between 660kHz and 1.28MHz allowing for the use of small external components. An external softstart pin enables the user to tailor the soft-start time to a specific application and limit the inrush current. The LDO also has an adjustable output voltage and is stable using ceramic output capacitors. The Op-Amp is capable of sourcing/sinking 135mA of current (typical). The gate pulse modulation switch can operate with a VGH voltage of 5V to 30V. The LM3311 is available in a low profile 24-lead LLP package.