(PDF) LM3401 Datasheet PDF | etcTI





LM3401 Datasheet PDF

Part Number LM3401
Description Hysteretic PFET Controller
Manufacture etcTI
Total Page 27 Pages
PDF Download Download LM3401 Datasheet PDF

Features: Datasheet pdf LM3401 www.ti.com SNVS516C – AUGUST 2007 – REVISED MAY 2013 LM3401 Hyste retic PFET Controller for High Power LE D Drive Check for Samples: LM3401 FEAT URES 1 •2 Hysteretic Control for Spee d and Simplicity • Input Operating Ra nge of 4.5V-35V • 1.5MHz Maximum Swit ching Frequency • Low 200mV Reference Voltage • Programmable Current Limit • High speed CMOS Compatible Enable/ Dimming • Adjustable Hysteresis • I nput UVLO • No output Capacitor Requi red • 8-pin VSSOP Package APPLICATION S • LED Driver • Battery Charger D ESCRIPTION The LM3401 is a switching co ntroller designed to provide constant c urrent to high power LEDs. The LM3401 d rives an external P-MOSFET switch for s tep-down (Buck) regulators. The LM3401 delivers constant current within ±6% a ccuracy to a wide variety and number of series connected LEDs. Output current is adjusted with an external current se nsing resistor to drive high power LEDs in excess of 1A. For improved accuracy and efficiency, the LM3401 features dual-side hyster.

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LM3401 datasheet
LM3401
www.ti.com
SNVS516C – AUGUST 2007 – REVISED MAY 2013
LM3401 Hysteretic PFET Controller for High Power LED Drive
Check for Samples: LM3401
FEATURES
1
2 Hysteretic Control for Speed and Simplicity
• Input Operating Range of 4.5V-35V
• 1.5MHz Maximum Switching Frequency
• Low 200mV Reference Voltage
• Programmable Current Limit
• High speed CMOS Compatible
Enable/Dimming
• Adjustable Hysteresis
• Input UVLO
• No output Capacitor Required
• 8-pin VSSOP Package
APPLICATIONS
• LED Driver
• Battery Charger
DESCRIPTION
The LM3401 is a switching controller designed to
provide constant current to high power LEDs. The
LM3401 drives an external P-MOSFET switch for
step-down (Buck) regulators. The LM3401 delivers
constant current within ±6% accuracy to a wide
variety and number of series connected LEDs. Output
current is adjusted with an external current sensing
resistor to drive high power LEDs in excess of 1A.
For improved accuracy and efficiency, the LM3401
features dual-side hysteresis, very low reference
voltage, and short propagation delay. A cycle by
cycle current limit provides protection against over
current and short circuit failures. Additional features
include adjustable hysteresis and a CMOS
compatible input pin for PWM dimming.
VIN = 4.5V to 35V
TYPICAL APPLICATION CIRCUIT
C1
R2
VIN
DIM
HYS
GND
R3
ILIM
LM3401
HG
CS
SNS
Q1
L1
D1
LED
current
R1
1
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.
All trademarks are the property of their respective owners.
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 © 2007–2013, Texas Instruments Incorporated

LM3401 datasheet
LM3401
SNVS516C – AUGUST 2007 – REVISED MAY 2013
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
CONNECTION DIAGRAM
CS
DIM
SNS
HYS
1
2
3
4
8 ILIM
7 VIN
6 HG
5 GND
Figure 1. Top View
8-Lead VSSOP
See DGK Package
Pin #
1
2
3
4
5
6
7
8
Pin
Name
CS
DIM
SNS
HYS
GND
HG
VIN
ILIM
PIN DESCRIPTIONS
Description
Current sense pin. Connect to the PFET drain
Dimming input pin. When DIM is low, the HG drive is off. Can be connected to a logic level PWM signal
Current feedback pin – to LED cathode. Connect a resistor from this pin to ground to set the DC LED current
Hysteresis adjust pin. Connect a resistor from this pin to GND to set the hysteresis window
Ground pin
Gate drive output. Connect to the PFET gate
Power supply input
Current limit adjust pin. Connect a resistor from this pin to the PFET source to set the current limit threshold
2 Submit Documentation Feedback
Product Folder Links: LM3401
Copyright © 2007–2013, Texas Instruments Incorporated




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