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LM3311 Datasheet(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LM3311
Description  Step-Up PWM DC/DC Converter with Integrated LDO, Op-Amp, and Gate Pulse Modulation Switch
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3311 Datasheet(HTML) 3 Page - National Semiconductor (TI)

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Pin Descriptions (Continued)
Pin
Name
Function
13
LV
IN
LDO power input.
14
SS
Boost converter soft start pin.
15
V
C
Boost compensation network connection. Connected to the output of the voltage error
amplifier.
16
FREQ
Switching frequency select input. Connect this pin to V
IN for 1.28MHz operation and
AGND for 660kHz operation.
17
V
IN
Boost converter and GPM power input.
18
SW
Boost power switch input. Switch connected between SW pin and PGND pin.
19
SHDN
Shutdown pin. Active low, pulling this pin low will disable the LM3311.
20
FB
Boost output voltage feedback input.
21
PGND
Power Ground. Source connection of the step-up regulator NMOS switch and ground for
the GPM circuit. Connect AGND and PGND directly to the DAP beneath the device.
22
CE
Connect capacitor from this pin to AGND.
23
RE
Connect a resistor between RE and PGND.
24
VGH
GPM power supply input. VGH range is 5V to 30V.
DAP
Die Attach Pad. Internally connected to GND. Connect AGND and PGND pins directly to
this pad beneath the device.
Block Diagrams
20126357
www.national.com
3


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