LM3648 Flash Driver Datasheet

LM3648 Datasheet, PDF, Equivalent


Part Number

LM3648

Description

Synchronous Boost LED Flash Driver

Manufacture

etcTI

Total Page 30 Pages
Datasheet
Download LM3648 Datasheet


LM3648
Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
LM3648, LM3648TT
SNVSA68D – OCTOBER 2014 – REVISED NOVEMBER 2016
LM3648 Synchronous Boost LED Flash Driver with 1.5-A High-Side Current Source
1 Features
1 1.5-A LED Current Source Programmability
• Accurate and Programmable LED Current Range
from 1.954 mA to 1.5 A
• Torch Currents up to 500 mA (LM3648TT)
• Flash Timeout Values up to 1.6 Seconds
(LM3648TT)
• Optimized Flash LED Current During Low Battery
Conditions (IVFM)
• > 85% Efficiency in Torch Mode (at 100 mA) and
Flash Mode (at 1 A to 1.5 A)
• Grounded Cathode LED Operation for Improved
Thermal Management
• Small Solution Size: < 16 mm2
• Hardware Strobe Enable (STROBE)
• Synchronization Input for RF Power Amplifier
Pulse Events (TX)
• Hardware Torch Enable (TORCH/TEMP)
• Remote NTC Monitoring (TORCH/TEMP)
• 400-kHz I2C-Compatible Interface
– LM3648 (I2C Address = 0x63)
2 Applications
• Camera Phone White-LED Flash
• Digital Still Cameras
• Fire-Alarm Notification
• Emergency Strobe Lighting
• Intruder Alert Notification
• Barcode Scanners
• Handheld Data Terminals
3 Description
The LM3648 is an LED flash driver that provides a
high level of adjustability within a small solution size.
The LM3648 utilizes a 2-MHz or 4-MHz fixed-
frequency synchronous boost converter to provide
power to the 1.5-A constant current LED source. An
adaptive regulation method ensures the current
source remains in regulation and maximizes
efficiency.
Features of the LM3648 are controlled via an I2C-
compatible interface. These features include:
hardware flash and hardware torch pins (STROBE
and TORCH/TEMP), a TX interrupt, and an NTC
thermistor monitor. The device offers 64
programmable currents in Flash and 128 levels in
Movie Mode (Torch) condition.
The 2-MHz or 4-MHz switching frequency options,
overvoltage protection (OVP), and adjustable current
limit allow for the use of tiny, low-profile inductors and
(10-µF) ceramic capacitors. The device operates over
a –40°C to +85°C ambient temperature range.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (MAX)
LM3648
DSBGA (12)
1.69 mm × 1.31 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
L1
1 PH
VIN
2.5V t 5.5V
C1
10 PF
PP/PC
LM3648
IN SW
HWEN
OUT
SDA
SCL
STROBE
TORCH/
TEMP
TX
LED
GND
C2
10 PF
D1
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.

LM3648
LM3648, LM3648TT
SNVSA68D – OCTOBER 2014 – REVISED NOVEMBER 2016
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 ............................................... 5
6.7 Switching Characteristics .......................................... 6
6.8 Typical Characteristics .............................................. 6
7 Detailed Description ............................................ 10
7.1 Overview ................................................................. 10
7.2 Functional Block Diagram ...................................... 11
7.3 Feature Description ................................................ 11
7.4 Device Functioning Modes...................................... 13
7.5 Programming........................................................... 16
7.6 Register Descriptions .............................................. 18
8 Applications and Implementation ...................... 22
8.1 Application Information............................................ 22
8.2 Typical Application ................................................. 22
9 Power Supply Recommendations...................... 27
10 Layout................................................................... 27
10.1 Layout Guidelines ................................................. 27
10.2 Layout Example ................................................... 28
11 Device and Documentation Support ................. 29
11.1 Device Support...................................................... 29
11.2 Documentation Support ........................................ 29
11.3 Receiving Notification of Documentation Updates 29
11.4 Community Resources.......................................... 29
11.5 Trademarks ........................................................... 29
11.6 Electrostatic Discharge Caution ............................ 29
11.7 Glossary ................................................................ 30
12 Mechanical, Packaging, and Orderable
Information ........................................................... 30
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision C (September 2016) to Revision D
Page
• Changed "(Default)" from "011111 = 748.75 mA" to "111111 = 1.5 A" in LED Flash Brightness Register ......................... 19
Changes from Revision B (September 2015) to Revision C
Page
• Added several additional Applications ................................................................................................................................... 1
Changes from Revision A (August 2015) to Revision B
Page
• Added "or 0x04 for LM3648TT" to Device ID Register row, Register Descriptions table..................................................... 18
• Changed "'011'" to "'000'" in Device Register Bits 5-3 description ....................................................................................... 21
Changes from Original (October 2014) to Revision A
Page
• Added Torch Currents up to 500 mA (LM3648TT)................................................................................................................. 1
• Added Flash Timeout Values up to 1.6 seconds (LM3648TT) .............................................................................................. 1
• Changed Handling Ratings to ESD Ratings; moved storage temperature to Abs Max ......................................................... 4
• Added ILED row for LM3648TT option .................................................................................................................................... 5
• Added VHR row for LM3648TT option .................................................................................................................................... 5
• Added several new graphs related to LM3648TT option performance ................................................................................. 5
• Added to 1.6 s on LM3648TT in Flash Time-Out ................................................................................................................. 15
• Added new eq. and LM3648TT values in LED Torch Brightness Reg.; added NOTE below LED Torch Brightness
Reg. description ................................................................................................................................................................... 19
• Added LM3648TT values for Timing Config. Reg.; added NOTE below Timing Config. Reg. description ......................... 20
• Added "or '100'" for LM3648TT in Device ID Register Bits 2-0 description ......................................................................... 21
• Added Application curves for LM3648TT performance ....................................................................................................... 24
2 Submit Documentation Feedback
Copyright © 2014–2016, Texas Instruments Incorporated
Product Folder Links: LM3648 LM3648TT


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM3648, LM3648TT SNVSA68D OCTOBER 2014 – REVISED NOVEMBER 201 6 LM3648 Synchronous Boost LED Flash Dr iver with 1.5-A High-Side Current Sourc e 1 Features •1 1.5-A LED Current So urce Programmability • Accurate and P rogrammable LED Current Range from 1.95 4 mA to 1.5 A • Torch Currents up to 500 mA (LM3648TT) • Flash Timeout Val ues up to 1.6 Seconds (LM3648TT) • Op timized Flash LED Current During Low Ba ttery Conditions (IVFM) • > 85% Effic iency in Torch Mode (at 100 mA) and Fla sh Mode (at 1 A to 1.5 A) • Grounded Cathode LED Operation for Improved Ther mal Management • Small Solution Size: < 16 mm2 • Hardware Strobe Enable (S TROBE) • Synchronization Input for RF Power Amplifier Pulse Events (TX) • Hardware Torch Enable (TORCH/TEMP) • Remote NTC Monitoring (TORCH/TEMP) • 400-kHz I2C-Compatible Interface – LM 3648 (I2C Address = 0x63) 2 Applications • Camera Phone White-LED Flash • Digital Still Cameras.
Keywords LM3648, datasheet, pdf, etcTI, Synchronous, Boost, LED, Flash, Driver, M3648, 3648, 648, LM364, LM36, LM3, Equivalent, stock, pinout, distributor, price, schematic, inventory, databook, Electronic, Components, Parameters, parts, cross reference, chip, Semiconductor, circuit, Electric, manual, substitute




@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)