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LM3648 Datasheet

Synchronous Boost LED Flash Driver

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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.




etcTI

LM3648 Datasheet Preview

LM3648 Datasheet

Synchronous Boost LED Flash Driver

No Preview Available !

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


Part Number LM3648
Description Synchronous Boost LED Flash Driver
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