LM3017_15 Datasheet, PDF (1/33 Pages) Texas Instruments – High Efficiency Low-Side Controller with True Shutdown

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LM3017
SNOSC66C – MARCH 2012 – REVISED MARCH 2013
High Efficiency Low-Side Controller with True Shutdown
Check for Samples: LM3017
FEATURES
1
•2 Fully Compliant to Thunderbolt™ Technology
Specifications
• True Shutdown for Short Circuit Protection
• Input Side Current Limit
• 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 × 2.7mm × 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
KEY SPECIFICATION
• Input Voltage Range of 5V to 18V
• 600 kHz fixed Frequency Operation
• ±1% Reference Voltage Accuracy Over
Temperature
• Low Shutdown Current (< 1µA), 40nA Typical
DESCRIPTION
The LM3017 is a versatile low-side NFET controller
incorporating true shutdown and input side current
limiting. It is designed for simple implementation of
boost conversions in Thunderbolt™ Technology. The
LM3017 can also be configured 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 shutdown mode, typically 40nA from
the input supply.
The LM3017 provides an adjustable output 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 incorporates 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.
TYPICAL APPLICATION CIRCUIT
30180901
Typical Boost Converter Application
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Thunderbolt is a trademark of Intell Corporation.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2012–2013, Texas Instruments Incorporated