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LM3555 Arkusz danych(PDF) 1 Page - Texas Instruments

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Numer części LM3555
Szczegółowy opis  Synchronous Boost Converter
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Strona internetowa  http://www.ti.com
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LM3555
2.2 µH
COUT
10 µF
CIN
10 µF
IND
PGND
VIN
VLED
SW
TORCH
STROBE
I2C/EN
SCL/EN1
SDA/EN2
VBAT
SGND
VOUT
Copyright © 2016, Texas Instruments Incorporated
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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.
LM3555
SNVS594G – DECEMBER 2008 – REVISED APRIL 2016
LM3555 Synchronous Boost Converter With 500-mA High-Side
LED Driver and Dual-Mode Control Interface
1
1 Features
1
High-Voltage High-Side Current Source Allows for
Grounded Cathode LED Operation
Synchronous Boost Converter
Peak Converter Efficiency > 90%
Accurate and Programmable LED Current
Ranging From 60 mA to 500 mA
Adaptive LED Current Range Based on LED
Configuration
Dedicated Indicator Current Source
Dedicated Torch and Strobe Pins
Dual Mode Control (General Purpose or I2C)
Broken Inductor Detection
Output Overvoltage Protection
Output and LED Short-Circuit Protection
400-kHz I2C-Compatible Interface
2 Applications
Camera Phone LED Flash
3 Description
The LM3555 is a 2-MHz fixed-frequency, current-
mode synchronous boost converter designed to drive
either a single flash LED at 500 mA or two series
flash LEDs at 400 mA. A high-voltage current source
allows the LEDs to be terminated to the GND plane
eliminating the need for an additional return trace
back to the device.
A dual-mode control interface allows the user to
configure
the
LM3555
with
a
general-purpose
interface using two enable pins for control or an I2C
allowing a higher level of control. Both interfaces
allow access to the indicator, assist light, and flash
modes. A dedicated STROBE pin provides a direct
interface to trigger the flash event, while an external
TORCH pin provides an additional method for
enabling the LEDs in a constant current mode.
The LM3555 can adaptively scale the maximum flash
level delivered to the LEDs based upon the flash
configuration, whether it be a single LED or two LEDs
in series.
Eight protection features are available on the LM3555
ranging
from
overvoltage
protection
to
broken
inductor detection. The LM3555 has four selectable
inductor current limits to help the user select an
inductor that is appropriate for the design.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (MAX)
LM3555
DSBGA (12)
2.09 mm × 1.565 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application


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