LM3560_14 Datasheet, PDF (1/48 Pages) Texas Instruments – Synchronous Boost Flash Driver

LM3560
www.ti.com
SNOSB43B – SEPTEMBER 2011 – REVISED AUGUST 2013
Synchronous Boost Flash Driver
With Dual 1-A High-Side Current Sources (2-A Total Flash Current)
Check for Samples: LM3560
FEATURES
1
•2 Dual High-Side Current Sources Allow for
Grounded Cathode LED Operation
• Accurate and Programmable LED Current from
31.25 mA to 2 A
• Independent LED Current Source
Programmability
• Up to 90% Efficient
• Ultra-Small Solution Size: < 26 mm²
• Four Operating Modes: Torch, Flash, Privacy
Indicate, and Message Indicator
• 4-Bit ADC for V_LED Monitoring
• LED Thermal Sensing and Current Scale-Back
• Hardware Flash and Torch Enable
• Dual Synchronization Inputs for RF Power
Amplifier Pulse Events
• LED and Output Disconnect During Shutdown
• Open and Short LED Detection
• 400-kHz I²C-Compatible Interface
• Active Low Hardware Reset
• 16-Bump (1.97mm x 1.97mm x 0.6mm) DSBGA
APPLICATIONS
• Camera Phone LED Flash
• White LED Biasing
DESCRIPTION
The LM3560 is a 2MHz fixed frequency synchronous
boost converter with two 1000 mA constant current
drivers for high-current white LEDs. The dual high-
side current sources allow for grounded cathode LED
operation and can be tied together for providing flash
currents at up to 2A through a single LED. An
adaptive regulation method ensures the current for
each LED remains in regulation and maximizes
efficiency.
Typical Application Circuit
1 2H/2.2 2H
2.5V to 5.5V
10 2F
SW
IN
OUT
LM3560
LED1
HWEN
LED2
STROBE
TX1/TORCH
TX2
SDA
SCL
LEDI/NTC
GND
10 2F
Flash
LED2
Flash
LED1
Optional Indicator Current
Source or Thermistor
Sensing Circuit
Component
L
COUT
CIN
LEDs
Manufacturer
Toko
Murata
Murata
Lumiled
Table 1. Application Circuit Component List
Value
1µH
10 µF
10 µF
Flash LED
Part Number
FDSD0312-1R0
GRM188R60J106M
GRM188R60J106M
PWF-4
Size (mm)
3 x 3 x 1.2
1.6 × 0.8 × 0.8 (0603)
1.6 × 0.8 × 0.8 (0603)
Rating
3.4A
6.3V
6.3V
VF = 3.6V @1A
1
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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 © 2011–2013, Texas Instruments Incorporated