LM3519MKEV National Semiconductor, LM3519MKEV Datasheet

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LM3519MKEV

Manufacturer Part Number
LM3519MKEV
Description
BOARD EVALUATION LM3519MK
Manufacturer
National Semiconductor
Series
PowerWise®r
Datasheets

Specifications of LM3519MKEV

Current - Output / Channel
20mA
Outputs And Type
1, Non-Isolated
Features
Dimmable
Voltage - Input
2.7 ~ 5.5V
Utilized Ic / Part
LM3519
Lead Free Status / RoHS Status
Not applicable / Not applicable
Voltage - Output
-
© 2006 National Semiconductor Corporation
LM3519 Evaluation Board
General Description
The LM3519 evaluation board is a working demonstration of
a step up DC-DC converter. The LM3519 drives up to 4 white
LEDs with constant current to provide LCD backlighting in
handheld devices. The LED current is internally set to 20mA
eliminating the use of external resistor. The series connec-
tion allows the LED current to be identical for uniform bright-
ness and minimizes the number of traces to the LEDs.
Brightness control is achieved by applying a PWM signal on
En pin with frequencies up to 30kHz. A proprietary PFM
architecture implementation results in non pulse skipping
variable frequency operation over input voltage range per-
mitting the use of low-cost, small external components. For
further information and electrical characteristics, please refer
to the LM3519 datasheet.
Typical Application
AN201688
FIGURE 1. Typical Application Circuit
National Semiconductor
Application Note 1406
Vera Tsang
January 2006
Operating Conditions
• Junction temperature (T
• Ambient temperature (T
• Input Voltage Range: 2.7V to 5.5V
• I
Package
• SOT 23 - 6 pin
OUT
= 20mA
A
J
20168804
) range: -40C to +125C
) range: -40C to +85C
www.national.com

Related parts for LM3519MKEV

LM3519MKEV Summary of contents

Page 1

... For further information and electrical characteristics, please refer to the LM3519 datasheet. Typical Application © 2006 National Semiconductor Corporation National Semiconductor Application Note 1406 Vera Tsang January 2006 Operating Conditions • ...

Page 2

Connection Diagram and Package Information Ordering Information Current Order Number 20mA LM3519MK-20 LM3519MKX-20 Pin Descriptions (SOT23-6) Pin# Name Description 1 En Device Enable Connection 2 Gnd Ground Connection 3 Vout Output Voltage Connection 4 LED_rtn White LED Current Sensing Input ...

Page 3

Evaluation Board Layout FIGURE 3. Top Layer FIGURE 4. Bottom Layer 3 20168810 20168811 www.national.com ...

Page 4

... BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...

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