LM3639A LED Driver Datasheet

LM3639A Datasheet, PDF, Equivalent


Part Number

LM3639A

Description

Single Chip 40V Backlight + 1.5A Flash LED Driver

Manufacture

etcTI

Total Page 28 Pages
Datasheet
Download LM3639A Datasheet


LM3639A
LM3639A
www.ti.com
SNVS964 – MARCH 2013
LM3639A Single Chip 40V Backlight + 1.5A Flash LED Driver
Check for Samples: LM3639A
FEATURES
1
2 Single Chip White LED Flash and Backlight
Driver
• 1.5A Flash LED Current
• Dual String Backlight Control (40V Max VOUT)
• 128 Level Exponential and Linear Brightness
Control
• PWM Input for CABC
• Programmable Over-Voltage Protection
(Backlight)
• Programmable Current Limit (Flash)
• Programmable Switching Frequency
• Optimized Flash Current During Low-Battery
Conditions
APPLICATIONS
• White LED Backlit Display Power
• White LED Camera Flash Power
L(B) Schottky
L(F)
VOUTB
up to 40V
COUTB
2.5V - 5.5V
CIN
SWF SWB OVP
VIN OUTF
COUTF
EN
SCL
SDA
STROBE
TX
PWM
BLED1
BLED2
FLED1
FLED2
GND
FLED2
OR
FLED1
DESCRIPTION
The LM3639A is a single-chip white LED Camera
Flash Driver + LCD Display Backlight Driver. The low-
voltage, high-current flash LED driver is a
synchronous boost which provides the power for a
single flash LED at up to 1.5A or dual LEDs at up to
750 mA each. The high-voltage backlight driver is a
dual-output asynchronous boost which powers dual
LED strings at up to 40V and 30 mA per string. An
adaptive regulation method in both boost converters
regulates the headroom voltage across the respective
source/sink to ensure the LED current remains in
regulation while maximizing efficiency. The
LM3639A's flash driver is a 2MHz or 4MHz fixed-
frequency synchronous boost converter plus 1.5A
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
1.5A. An adaptive regulation method ensures the
current source remains in regulation and maximizes
efficiency.
The device is controlled by an I2C-compatible
interface. Features for the flash LED driver include a
hardware flash enable (STROBE) allowing a logic
input to trigger the flash pulse, and a TX input for
synchronization to RF power amplifier events or other
high current conditions. Features for the LCD
backlight driver include a PWM input for content
adjustable backlight control, 128 exponential or linear
brightness levels, programmable over-voltage
protection, and selectable switching frequency (500
kHz or 1 MHz).
The device is available in a tiny 1.790 mm x 2.165
mm x 0.6 mm 20-bump, 0.4 mm pitch DSBGA
package and operates over the 40°C to +85°C
temperature range.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2013, Texas Instruments Incorporated

LM3639A
LM3639A
SNVS964 – MARCH 2013
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
Connection Diagram
44
33
22
11
ABCDE
EDCBA
Top View
Bottom View
Figure 1. 20-Bump, 0.4 mm Pitch DSBGA Package
YFQ0020HGA
TERMINAL
NAME
FLED1
FLED2
NO.
A1
B1
OUTF (x2)
A2/B2
SWF (x2)
GND (x3)
TX
A3/B3
A4/B4/E3
C2
STROBE
C3
VIN
SDA
SCL
EN
SWB
PWM
BLED1
BLED2
OVP
C4
D3
D2
C1
E4
D4
D1
E1
E2
PIN DESCRIPTIONS
I/O DESCRIPTION
Output
Output
Output
Output
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
High Side Current Source Output for Flash LED1.
High Side Current Source Output for Flash LED2.
Flash LED Boost Output. Connect a 10 µF ceramic capacitor between this
pin GND.
Drain Connection for Internal NMOS and Synchronous PMOS Switches.
Connect the Flash LED Boost Inductor to SWF.
Ground
Power Amplifier Synchronization Input. The TX pin has a 300 kpull-down
resistor connected to GND.
Active High Hardware Flash Enable. Drive STROBE high to turn on Flash
pulse. STROBE overrides TORCH. The STROBE pin has a 300 kpull-
down resistor connected to GND.
Input Voltage Connection. Connect IN to the input supply, and bypass to
GND with a 10 µF or larger ceramic capacitor.
Serial Data Input/Output.
Serial Clock Input.
Enable Pin. High = Standby, Low = Shutdown/Reset.
Drain Connection for internal NFET. Connect SWB to the junction of the
backlight boost inductor and the Schottky diode anode.
PWM Brightness Control Input for backlight current control. The PWM pin
has a 300 kpull-down resistor connected to GND.
Input Terminal to Backlight LED String Current Sink #1 (40V max). The boost
converter regulates the minimum of BLED1 and BLED2 to 400 mV.
Input Terminal to Backlight LED String Current Sink #2 (40V max). The boost
converter regulates the minimum of BLED1 and BLED2 to 400 mV.
Over-Voltage Sense Input for Backlight Boost. Connect to the positive
terminal of (COUTB).
2 Submit Documentation Feedback
Product Folder Links: LM3639A
Copyright © 2013, Texas Instruments Incorporated


Features LM3639A www.ti.com SNVS964 – MARCH 2 013 LM3639A Single Chip 40V Backlight + 1.5A Flash LED Driver Check for Sampl es: LM3639A FEATURES 1 •2 Single Chi p White LED Flash and Backlight Driver • 1.5A Flash LED Current • Dual Str ing Backlight Control (40V Max VOUT) 128 Level Exponential and Linear Brig htness Control • PWM Input for CABC Programmable Over-Voltage Protection (Backlight) • Programmable Current L imit (Flash) • Programmable Switching Frequency • Optimized Flash Current During Low-Battery Conditions APPLICATI ONS • White LED Backlit Display Power • White LED Camera Flash Power L(B) Schottky L(F) VOUTB up to 40V COUTB 2.5V - 5.5V CIN SWF SWB OVP VIN OUTF COUTF LM3639A EN SCL SDA STROBE TX PW M BLED1 BLED2 FLED1 FLED2 GND FLED2 OR FLED1 DESCRIPTION The LM3639A is a single-chip white LED Camera Flash Dri ver + LCD Display Backlight Driver. The lowvoltage, high-current flash LED dri ver is a synchronous boost which provides the power for a single flash LED at up to 1.5.
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