LM3561_13 Datasheet, PDF (1/37 Pages) Texas Instruments – Synchronous Boost Converter

LM3561
www.ti.com
SNOSB44C – MARCH 2011 – REVISED MAY 2013
Synchronous Boost Converter
With 600-mA High-Side LED Driver and I²C-Compatible Interface
Check for Samples: LM3561
FEATURES
1
•2 High-Side Current Source Allows Grounded
LED Cathode
• Up to 90% Efficient
• Ultra-Small Solution Size: <16mm²
• Three Operating Modes: Torch, Flash, and LED
Indicator
• Accurate and Programmable LED Current from
18mA to 600mA
• Hardware Flash and Torch Enable
• LED Thermal Sensing and Current Scaleback
• Software Selectable Input Voltage Monitor
• Programmable Flash Timeout
• Dual Synchronization Inputs for RF Power
Amplifier Pulse Events
• Open and Short LED Detection
• Active High Hardware Enable for Protection
Against System Faults
• 400kHz I²C-compatible Interface
• 12-Bump (1.215mm × 1.615mm × 0.6mm)
DSBGA Package
APPLICATIONS
• Camera Phone LED Flash Controller
• LED Current Source Biasing
DESCRIPTION
The LM3561 is a 2-MHz fixed-frequency current-
mode synchronous boost converter. The device is
designed to operate as a single 600-mA constant
current driver for high-current white LEDs. The high-
side current source allows for grounded cathode LED
operation while the 250-mV regulated headroom
voltage ensures that the LED current is well regulated
and efficiency remains high.
Typical Application Circuits
1 PH/2.2 PH
2.5V to 5.5V
10 PF
SW
IN
OUT
LM3561
HWEN
LED
STROBE
TX1/TORCH
TX2
SDA
SCL
LEDI/NTC
GND
10 PF
Flash
LED
Optional Indicator LED or
Thermistor input for LED
temperature measurement
LEDI/
TX2
NTC
LM3561
TX1
STROBE
SDA
SCL
HWEN
IN
LED
COUT
OUT
L
2.9 mm
Figure 1.
CIN
5.3 mm
Figure 2. Example Layout
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 © 2011–2013, Texas Instruments Incorporated