LM3642 Flash Driver Datasheet

LM3642 Datasheet, PDF, Equivalent


Part Number

LM3642

Description

1.5-A Synchronous Boost LED Flash Driver

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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LM3642
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LM3642
SNVS891H – SEPTEMBER 2012 – REVISED SEPTEMBER 2015
LM3642 1.5-A Synchronous Boost LED Flash Driver With High-Side Current Source
1 Features
1 1.5-A High-Side Current Source for Single LED
• > 85% Efficiency in Torch Mode (at 100 mA) and
Flash Mode (at 1 A to 1.5 A)
• Accurate Programmable Flash LED Current from
93 mA to 1.5 A
• Accurate Programmable Torch LED Currents:
– 48.4 mA to 375 mA
– 24 mA to 187 mA (LT option)
• Small Solution Size: < 20 mm2
• Soft-Start Operation for Battery Protection
• Hardware Strobe Enable
• Synchronization Input for RF Power Amplifier
Pulse Events
• VIN Flash Monitor Optimization
• 400-kHz I2C-Compatible Interface
• 0.5-mm Pitch, 9-Bump DSBGA
2 Applications
Camera Phone LED Flash
3 Description
The LM3642 is a 4-MHz fixed-frequency synchronous
boost converter plus 1.5-A constant current driver for
a high-current white LED. The high-side current
source allows for grounded cathode LED operation
providing Flash current up to 1.5 A. An adaptive
regulation method ensures the current source
remains in regulation and maximizes efficiency.
The LM3642 is controlled via an I2C-compatible
interface. Features include a hardware flash enable
(STROBE) allowing a logic input to trigger the flash
pulse as well as a TX input which forces the flash
pulse into a low-current Torch Mode, allowing for
synchronization to RF power amplifier events or other
high-current conditions.
The 4-MHz switching frequency, overvoltage
protection and adjustable current limit settings allow
the use of tiny, low-profile inductors and (10-µF)
ceramic capacitors. The device is available in a small
9-bump DSBGA package and operates over the
40°C to 85°C temperature range.
Device Information(1)
PART NUMBER PACKAGE
BODY SIZE (MAX)
LM3642
DSBGA (9)
1.69 mm × 1.64 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
1 2H
2.5V to 5.5V
10 2F
IN SW OUT
10 2F
STROBE
LED
TX/TORCH
SDA
SCL
GND
Flash
LED
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.

LM3642
LM3642
SNVS891H – SEPTEMBER 2012 – REVISED SEPTEMBER 2015
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 4
6.5 Electrical Characteristics........................................... 5
6.6 Timing Requirements ................................................ 6
6.7 Typical Characteristics .............................................. 7
7 Detailed Description .............................................. 9
7.1 Overview ................................................................... 9
7.2 Functional Block Diagram ......................................... 9
7.3 Feature Description................................................. 10
7.4 Device Functional Modes........................................ 11
7.5 Programming........................................................... 12
7.6 Register Map........................................................... 15
8 Application and Implementation ........................ 18
8.1 Application Information............................................ 18
8.2 Typical Application ................................................. 18
9 Power Supply Recommendations...................... 22
10 Layout................................................................... 22
10.1 Layout Guidelines ................................................. 22
10.2 Layout Example .................................................... 23
11 Device and Documentation Support ................. 24
11.1 Device Support...................................................... 24
11.2 Documentation Support ........................................ 24
11.3 Trademarks ........................................................... 24
11.4 Community Resources.......................................... 24
11.5 Electrostatic Discharge Caution ............................ 24
11.6 Glossary ................................................................ 24
12 Mechanical, Packaging, and Orderable
Information ........................................................... 24
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision G (December 2014) to Revision H
Page
• Changed Handling Ratings table to ESD Ratings table per SDS format; move Storage Temp to Abs Max table ............... 4
• Added "If an I2C command is used to terminate the flash event, TI recommends selecting a flash time-out level 100
ms above the desired flash duration ." to end of Flash Time-Out subsection...................................................................... 10
Changes from Revision F (December 2013) to Revision G
Page
• Added Pin Configuration and Functions section, Handling Rating 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 updated full Thermal Information ............................................................................................................................... 4
Changes from Revision E (May 2013) to Revision F
Page
• Deleted TX interrupt ............................................................................................................................................................... 9
2 Submit Documentation Feedback
Product Folder Links: LM3642
Copyright © 2012–2015, Texas Instruments Incorporated


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM3642 SNVS891H – SEPTEMBE R 2012 – REVISED SEPTEMBER 2015 LM364 2 1.5-A Synchronous Boost LED Flash Dri ver With High-Side Current Source 1 Fe atures •1 1.5-A High-Side Current Sou rce for Single LED • > 85% Efficiency in Torch Mode (at 100 mA) and Flash Mo de (at 1 A to 1.5 A) • Accurate Progr ammable Flash LED Current from 93 mA to 1.5 A • Accurate Programmable Torch LED Currents: – 48.4 mA to 375 mA – 24 mA to 187 mA (LT option) • Small Solution Size: < 20 mm2 • Soft-Start Operation for Battery Protection • Ha rdware Strobe Enable • Synchronizatio n Input for RF Power Amplifier Pulse Ev ents • VIN Flash Monitor Optimization • 400-kHz I2C-Compatible Interface 0.5-mm Pitch, 9-Bump DSBGA 2 Applica tions Camera Phone LED Flash 3 Descrip tion The LM3642 is a 4-MHz fixed-freque ncy synchronous boost converter plus 1. 5-A constant current driver for a high-current white LED. The high-side current source allows.
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