TPS61042 Driver Datasheet

TPS61042 Datasheet, PDF, Equivalent


Part Number

TPS61042

Description

Constant Current LED Driver

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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TPS61042
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TPS61042
SLVS441D – DECEMBER 2002 – REVISED DECEMBER 2014
TPS61042 Constant Current LED Driver
1 Features
1 Current Source With Overvoltage Protection
• Input Voltage Range: 1.8 V to 6 V
• Internal 30 V Switch
• Up to 85% Efficiency
• Precise Brightness Control Using PWM Signal or
Analog Signal
• Switching Frequency: Up to 1 MHz
• Internal Power MOSFET Switch: 500 mA
• Operates With Small Output Capacitors Down to
100 nF
• Disconnects LEDs During Shutdown
• No Load Quiescent Current: 38 µA Typ
• Shutdown Current: 0.1 µA Typ
• Available in a Small 3 mm × 3 mm QFN Package
2 Applications
• White LED Supply for Backlight/Sidelight Displays
– PDA, Pocket PC, Smart Phones
– Handheld Devices
– Cellular Phones
3 Description
The TPS61042 is a high frequency boost converter
with constant current output that drives white LEDs or
similar. The LED current is set with the external
sense resistor (RS) and is directly regulated by the
feedback pin (FB) that regulates the voltage across
the sense resistor RS to 252 mV (typ). To control LED
brightness, the LED current can be pulsed by
applying a PWM (pulse width modulated) signal with
a frequency range of 100 Hz to 50 kHz to the control
pin (CTRL). To allow higher flexibility, the device can
be configured where the brightness can be controlled
by an analog signal as well, as described in the
application information section. To avoid possible
leakage currents through the LEDs during shutdown,
the control pin (CTRL) disables the device and
disconnects the LEDs from ground. For maximum
safety during operation, the output has integrated
overvoltage protection that prevents damage to the
device in case of a high impedance output (e.g. faulty
LED).
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS61042
SON (8)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
4 Typical Application
L1
4.7 μH
D1
Vin
1.8 V to 6 V
Cin
4.7 μF
38
VIN SW
5 CTRL OVP 7
6 GND LED 1
4 FB
RS 2
CO
100 nF
Enable/PWM Brightness Control
100 Hz to 50 kHz
Rs
13 Ω
Larger output capacitor values of 1 µF and larger, reduce the LED ripple current and improve line regulation.
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.

TPS61042
TPS61042
SLVS441D – DECEMBER 2002 – REVISED DECEMBER 2014
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Typical Application ................................................ 1
5 Revision History..................................................... 2
6 Pin Configuration and Functions ......................... 3
7 Specifications......................................................... 3
7.1 Absolute Maximum Ratings ...................................... 3
7.2 ESD Ratings ............................................................ 4
7.3 Recommended Operating Conditions....................... 4
7.4 Thermal Information .................................................. 4
7.5 Electrical Characteristics........................................... 5
7.6 Typical Characteristics .............................................. 6
8 Detailed Description .............................................. 8
8.1 Overview ................................................................... 8
8.2 Functional Block Diagram ......................................... 8
8.3 Feature Description................................................... 9
8.4 Device Functional Modes........................................ 10
9 Application and Implementation ........................ 11
9.1 Application Information............................................ 11
9.2 Typical Application ................................................. 16
10 Power Supply Recommendations ..................... 21
11 Layout................................................................... 21
11.1 Layout Guidelines ................................................. 21
11.2 Layout Example .................................................... 21
12 Device and Documentation Support ................. 22
12.1 Device Support...................................................... 22
12.2 Documentation Support ....................................... 22
12.3 Trademarks ........................................................... 22
12.4 Electrostatic Discharge Caution ............................ 22
12.5 Glossary ................................................................ 22
13 Mechanical, Packaging, and Orderable
Information ........................................................... 22
5 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision C (March 2007) to Revision D
Page
• Added Device Information table, Feature Description section, Device Functional Modes, Application and
Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation
Support section, and Mechanical, Packaging, and Orderable Information section ............................................................... 1
• Added the equation number to all the equations ................................................................................................................... 9
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Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community TPS61042 SLVS441D – DECEMB ER 2002 – REVISED DECEMBER 2014 TPS61 042 Constant Current LED Driver 1 Feat ures •1 Current Source With Overvolta ge Protection • Input Voltage Range: 1.8 V to 6 V • Internal 30 V Switch Up to 85% Efficiency • Precise Bri ghtness Control Using PWM Signal or Ana log Signal • Switching Frequency: Up to 1 MHz • Internal Power MOSFET Swit ch: 500 mA • Operates With Small Outp ut Capacitors Down to 100 nF • Discon nects LEDs During Shutdown • No Load Quiescent Current: 38 µA Typ • Shutd own Current: 0.1 µA Typ • Available in a Small 3 mm × 3 mm QFN Package 2 A pplications • White LED Supply for Ba cklight/Sidelight Displays – PDA, Poc ket PC, Smart Phones – Handheld Devic es – Cellular Phones 3 Description T he TPS61042 is a high frequency boost c onverter with constant current output t hat drives white LEDs or similar. The LED current is set with the external sense resistor (RS) and is .
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