LM3697 LED driver Datasheet

LM3697 Datasheet, PDF, Equivalent


Part Number

LM3697

Description

High-efficiency three-string white LED driver

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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LM3697
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LM3697
SNOSCS2D – NOVEMBER 2013 – REVISED MARCH 2019
LM3697 High-efficiency three-string white LED driver
1 Features
1 Drives three parallel high-voltage led strings for
display and keypad lighting
• High-voltage strings capable of up to 40-V output
voltage and up to 90% efficiency
• Up to 30 mA per current sink
• 11-Bit configurable dimming resolution
• PWM input for content adjustable brightness
control (CABC)
• Fully configurable LED grouping and control
• Integrated 1-A/40-V MOSFET
• Adaptive boost output to LED voltages
• Selectable 500-kHz and 1-MHz switching
frequency
• Four configurable overvoltage protection
thresholds (16 V, 24 V, 32 V, and 40 V)
• Overcurrent protection
• Thermal shutdown protection
• 29-mm2 Total solution size
2 Applications
• Power source for smart phone illumination
• Display, keypad, and indicator illumination
VIN = 2.7V to 5.5V
VIN
Simplified Schematic
L D1
CIN
VOUT up to 40V
COUT
IN
SDA
SCL
HWEN
PWM
SW OVP
HVLED1
HVLED2
HVLED3
PGND
3 Description
The LM3697 11-bit LED driver provides high-
performance backlight dimming for 1, 2, or 3 series
LED strings while delivering up to 90% efficiency. The
boost converter with integrated 1-A, 40-V MOSFET
automatically adjusts to LED forward voltage to
minimize headroom voltage and effectively improve
LED efficiency.
The LM3697 is a high-efficiency three-string power
source for backlight or keypad LEDs in smart-phone
handsets. The high-voltage inductive boost converter
provides the power for three-series LED strings for
display backlight and keypad functions (HVLED1,
HVLED2, and HVLED3).
An additional feature is a pulse width modulation
(PWM) control input for content adjustable backlight
control, which can be used to control any high-
voltage current sink.
The LM3697 is fully configurable via an I2C-
compatible interface. The device operates over a
2.7-V to 5.5-V input voltage range and a 40°C to
+85°C temperature range.
Device Information(1)
ORDER NUMBER
PACKAGE
BODY SIZE (MAX)
LM3697
DSBGA (12)
1.64 mm × 1.29 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
space
space
space
Boost Efficiency
Three String, L=22µH, 1MHz
92%
90%
88%
86%
84%
82%
80%
78%
76%
3s3p
4s3p
74%
5s3p
72%
70%
6s3p
7s3p
2.5 3 3.5 4 4.5 5 5.5
VIN (V)
C049
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.

LM3697
LM3697
SNOSCS2D – NOVEMBER 2013 – REVISED MARCH 2019
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 4
6 Specifications......................................................... 5
6.1 Absolute Maximum Ratings ...................................... 5
6.2 ESD Ratings.............................................................. 5
6.3 Recommended Operating Conditions....................... 5
6.4 Thermal Information .................................................. 5
6.5 Electrical Characteristics .......................................... 6
6.6 Timing Requirements ................................................ 7
6.7 Typical Characteristics .............................................. 8
7 Detailed Description .............................................. 9
7.1 Overview ................................................................... 9
7.2 Functional Block Diagram ......................................... 9
7.3 Feature Descriptions ............................................... 10
7.4 Device Functional Modes........................................ 13
7.5 Register Maps ......................................................... 17
8 Application and Implementation ........................ 21
8.1 Application Information............................................ 21
8.2 Typical Applications ................................................ 21
8.3 Initialization Set Up ................................................. 32
9 Power Supply Recommendations...................... 32
10 Layout................................................................... 33
10.1 Layout Guidelines ................................................. 33
10.2 Layout Example .................................................... 36
11 Device and Documentation Support ................. 37
11.1 Device Support...................................................... 37
11.2 Related Documentation ....................................... 37
11.3 Receiving Notification of Documentation Updates 37
11.4 Community Resources.......................................... 37
11.5 Trademarks ........................................................... 37
11.6 Electrostatic Discharge Caution ............................ 37
11.7 Glossary ................................................................ 37
12 Mechanical, Packaging, and Orderable
Information ........................................................... 37
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision C (October 2015) to Revision D
Page
• Changed Table 2 revision register POWER-ON RESET value from 0x00 to 0x01, change silicon revision value in
Table 3 from 0000 to 0001 .................................................................................................................................................. 17
Changes from Revision B (April 2014) to Revision C
Page
• Changed format of Device Information; add footnote and "MAX" ......................................................................................... 1
• Changed Handling Ratings table to ESD Ratings table format; move storage temp to Abs Max table................................. 5
• Added additional Thermal Information ................................................................................................................................... 5
• Added subsection High-Speed Mode .................................................................................................................................. 16
Changes from Revision A (December 2013) to Revision B
Page
• Changed to new TI datasheet standards; added Handling Ratings table; added 2 ambient temperature specs to
IHVLED and one to IMATCH_HV ..................................................................................................................................................... 1
• Changed title from Pin Configurations to Terminal Functions and all references from "pins" to "terminals" ......................... 4
• Changed change "terminal" back to "pin" per latest documentation standard; add "Type" column to Pin Functions
table ....................................................................................................................................................................................... 4
• Changed Timing information from Elec Char table Timing Requirements ............................................................................. 7
• Changed Functional Description section to Detailed Description section ............................................................................. 9
• Changed Applications Information section to Application and Implementation ................................................................... 22
• Changed Typical Characteristics from own section into subsection of Specifications ........................................................ 24
• Added new Power Supply Recommendations section ........................................................................................................ 32
• Changed Layout section to include separate Layout Example ........................................................................................... 33
• Added new Device and Documentation Support section and Mechanical, Packaging and Orderable paragraph ............. 37
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Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity LM3697 SNOSCS2D – NOVEMBER 20 13 – REVISED MARCH 2019 LM3697 High-e fficiency three-string white LED driver 1 Features •1 Drives three parallel high-voltage led strings for display a nd keypad lighting • High-voltage str ings capable of up to 40-V output volta ge and up to 90% efficiency • Up to 3 0 mA per current sink • 11-Bit config urable dimming resolution • PWM input for content adjustable brightness cont rol (CABC) • Fully configurable LED g rouping and control • Integrated 1-A/ 40-V MOSFET • Adaptive boost output t o LED voltages • Selectable 500-kHz a nd 1-MHz switching frequency • Four c onfigurable overvoltage protection thre sholds (16 V, 24 V, 32 V, and 40 V) • Overcurrent protection • Thermal shu tdown protection • 29-mm2 Total solut ion size 2 Applications • Power sourc e for smart phone illumination • Disp lay, keypad, and indicator illumination VIN = 2.7V to 5.5V VIN Simplified Schematic L D1 CIN V.
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