LM3311SQ National Semiconductor Corporation, LM3311SQ Datasheet - Page 3

• Manufacturer Part Number: LM3311SQ
• Description: Step-up Pwm Dc/dc Converter With Integrated Ldo, Op-amp, And Gate Pulse Modulation Switch
• Manufacturer: National Semiconductor Corporation

Block Diagrams
DAP
Pin
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
8
9
AGND
PGND
FREQ
SHDN
Name
NEG
POS
V
VGH
LV
ADJ
SW
V
CE
RE
SS
FB
V
OUT
IN
C
IN
Negative input terminal of the Op-Amp.
Positive input terminal of the Op-Amp.
Analog ground for the step-up regulator, LDO, and Op-Amp. Connect directly to DAP and PGND
beneath the device.
LDO output voltage feedback input.
LDO regulator output.
LDO power input.
Boost converter soft start pin.
Boost compensation network connection. Connected to the output of the voltage error amplifier.
Switching frequency select input. Connect this pin to V
660kHz operation.
Boost converter and GPM power input.
Boost power switch input. Switch connected between SW pin and PGND pin.
Shutdown pin. Active low, pulling this pin low will disable the LM3311.
Boost output voltage feedback input.
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.
Connect capacitor from this pin to AGND.
Connect a resistor between RE and PGND.
GPM power supply input. VGH range is 5V to 30V.
Die Attach Pad. Internally connected to GND. Connect AGND and PGND pins directly to this pad
beneath the device.
3
Function
IN
for 1.28MHz operation and AGND for
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