LM3017 Datasheet, PDF (1/13 Pages) Texas Instruments – High Efficiency Low-Side Controller with True Shutdown

LM3017
PRELIMINARY
March 12, 2012
High Efficiency Low-Side Controller with True Shutdown
General Description
The LM3017 is a versatile low-side NFET controller incorpo-
rating true shutdown and input side current limiting. It is
designed for simple implementation of boost conversions in
Thunderbolt™ Technology. The LM3017 can also be config-
ured for flyback or SEPIC designs. The input voltage range of
5V to 18V accommodates a two or three cell lithium ion battery
or a 12V rail. The enable pin accepts a single input to drive
three different modes of operation: boost, pass through, or
shutdown mode. The LM3017 draws very low current in shut-
down mode, typically 40nA from the input supply.
The LM3017 provides an adjustable output from V_IN to 20V in
order to drive the Power Load Switch or Mux for the host
Thunderbolt™ port. The ability to drive an external high-side
NMOS provides for true isolation of the load from the input.
Current limiting on the input ensures that inrush and short-
circuit currents are always under control. The LM3017 incor-
porates built in thermal shutdown, cycle-by-cycle current limit,
short circuit protection, output overvoltage protection, and
soft-start. It is available in a 10-pin QFN package.
Key Specifications
■ ^{Input voltage range of 5V to 18V}
■ ^{400 kHz fixed frequency operation}
■ ^{±1% reference voltage accuracy over temperature}
■ ^{Low shutdown current (< 1µA), 40nA typical}
■ ^{±3% D.C. input current limit}
Features
■ ^{Fully compliant to Thunderbolt™ Technology}
specifications
■ ^{True shutdown for short circuit protection}
■ ^{Single enable pin with three modes of operation: boost,}
pass through, or shutdown
■ ^{Built-in charge pump for high-side NFET disconnect}
switch
■ ^{1A push-pull driver for low-side NFET}
■ ^{Peak current mode control}
■ ^{Simple slope compensation}
■ ^{Protection features: thermal shutdown, cycle-by-cycle}
current limit, short circuit protection, output overvoltage
protection, and latch-off
■ ^{Internal soft-start}
■ ^{2.4mm x 2.7mm x 0.8mm 10-pin QFN package}
Applications
■ ^{Thunderbolt Technology™ Host Ports}
■ ^{Notebook and Desktop Computers, Tablets, and Other}
Portable Consumer Electronics
■ ^{Hard Disc Drives, Solid State Drives}
■ ^{Offline Power Supplies}
■ ^{Set-Top Boxes}
Typical Application Circuit
Typical Boost Converter Application
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