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LM3311SQNSN/a137860avaiStep-Up PWM DC/DC Converter with Integrated LDO, Op-Amp, and Gate Pulse Modulation Switch
LM3311SQXNSCN/a1370avaiStep-Up PWM DC/DC Converter with Integrated LDO, Op-Amp, and Gate Pulse Modulation Switch


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LM3311SQX ,Step-Up PWM DC/DC Converter with Integrated LDO, Op-Amp, and Gate Pulse Modulation SwitchPin DescriptionsPin Name Function1 NC Not internally connected.2 VGHM Output of GPM circuit. This o ..
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LM3311SQ-LM3311SQX
Step-Up PWM DC/DC Converter with Integrated LDO, Op-Amp, and Gate Pulse Modulation Switch
LM3311
Step-Up PWM DC/DC Converter with Integrated LDO,
Op-Amp, and Gate Pulse Modulation Switch
General Description

The LM3311isa step-up DC/DC converter integrated with LDO,an Operational Amplifier, anda gate pulse modu-
lation switch. The boost (step-up) converteris usedto gen-
eratean adjustable output voltage and featuresalow RDSON
internal switchfor maximum efficiency. The operating fre-
quencyis selectable between 660kHz and 1.28MHz allowing
forthe useof small external components.An external soft-
start pin enables the userto tailor the soft-start timetoa
specific application and limit the inrush current. The LDO
also hasan adjustable output voltage andis stable using
ceramic output capacitors. The Op-Ampis capableof
sourcing/sinking 135mAof current (typical). The gate pulse
modulation switch can operate witha VGH voltageof5Vto
30V. The LM3311is availableina low profile 24-lead LLP
package.
Features
Boost converter witha 2A, 0.18Ω switch Boost output voltage adjustableupto 20V Operating voltage rangeof 2.5Vto7V 660kHz/1.28MHzpin selectable switching frequency Adjustable soft-start function Input undervoltage protection Over temperature protection Adjustable low dropout linear regulator (LDO) Integrated Op-Amp Integrated gate pulse modulation (GPM) switch 24-Lead LLP package
Applications
TFT Bias Supplies Portable Applications
Typical Application Circuit

September 2005
LM331
Step-Up
PWM
DC/DC
Converter
with
Integrated
LDO,
Op-Amp,
and
Gate
Pulse
Modulation
Switch
ic,good price


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