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Eutech Microelectronics

EUP2471 Datasheet Preview

EUP2471 Datasheet

1.5A Dual WLED Flash Driver

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EUP2471
1.5A Dual WLED Flash Driver
with I2C Compatible Interface
DESCRIPTION
The EUP2471 is a 2MHz fixed frequency, current mode
synchronous boost converter. The device is designed to
operate as a dual 750mA (1.5A total) constant current
driver for flash white LED application.
An industry-standard I2C serial digital input is used to
enable, disable and set the movie-mode current for each
flash LED with up to 16 movie-mode settings. The
EUP2471 also includes a separate Flash Enable input to
initiate both the flash operation and the default timer,
which can be used either to terminate a flash event at the
end of a user-programmed delay or as a safety feature.
The maximum flash and movie-mode current is set by
one external resistor; the ratio of Flash to Movie-mode
current is set at approximately 6.1:1.
An over-voltage protection feature keeps the output
voltage below the OVP threshold in case of an open LED
and an output short circuit protection limits the output
current during an output short to GND. The chip’s
quiescent current is less than 1.0µA in shutdown mode.
FEATUES
2.7V to 5.5V Input Supply Range
Dual Channel Output with Separate
Flash Enable
Up to 1.5A Regulated Output Current
(750mA per channel)
Up to 85% Efficiency
2 MHz Fixed Switching Frequency
I2C Compliant Serial Interface
- 400kHz Serial Transfer Rate
-16 Level Movie-mode Current
-Flash/Movie-mode
-Programmable LED Current
-Programmable Flash Safety Timer
True Load Disconnect
Input Current Limit
Output Over-Voltage, Short Circuit, and
Over-Temperature Protection
3mm × 3mm TDFN-14 Package
RoHS Compliant and 100% Lead (Pb)-Free
Halogen-Free
APPLICATIONS
Camera-enabled Cellular Phones
and Smart Phones
Digital Still Cameras (DSCs)
LED Photo Flash/Torch
Typical Application Circuit
DS2471 Ver1.0 Mar. 2011
Figure 1. EUP2471 Typical Application
1




Eutech Microelectronics

EUP2471 Datasheet Preview

EUP2471 Datasheet

1.5A Dual WLED Flash Driver

No Preview Available !

Pin Configurations
Package Type
EUP2471Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
Pin Configurations
TDFN-14
Pin Description
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Thermal
Pad
TDFN-14
CT
EN
FLEN
AGND
IN
SW
PGND
OUT
SCL
SDA
FLOUTB
FLGND
FLOUTA
RSET
-
DESCRIPTION
Flash timer control input. Connect a capacitor between CT and AGND to set maximum
duration of the flash pulse. To disable the flash timer, connect CT to AGND.
Enable input. EN is an active HIGH asserted input. EN must be strobed low-to-high to
enable the EUP2471 to accept I2C programming instructions.
Flash enable pin. A low-to-high transition on the FLEN pin initiates a flash pulse and
starts the flash timer.
Analog ground pin. Connect AGND to PGND, GND, and FLGND at a single point as
close to the EUP2471 as possible.
Power input. Connect IN to the input power supply voltage. Connect a 2.2µF or larger
ceramic capacitor from IN to PGND as close as possible to the EUP2471.
Boost converter switching node. Connect a 1µH inductor between SW and IN.
Power ground pin. Connect PGND to AGND, GND, and FLGND at a single point as
close to the EUP2471 as possible.
Power output of the boost converter. Connect a 2.2µF or larger ceramic capacitor from
OUT to PGND as close as possible to the EUP2471. Connect OUT to the anode(s) of the
Flash LED(s).
I2C interface serial control line.
I2C interface serial data/address.
Flash Output B. Connect cathode of Flash LEDB to FLOUTB. For a single flash LED,
connect FLOUTB and FLOUTA together. For two flash LEDs, each output will conduct
50% of the total flash output current.
Flash ground pin. Connect FLGND to PGND, GND, and AGND at a single point as close
to the EUP2471 as possible.
Flash Output A. Connect cathode of Flash LEDA to FLOUTA. For a single flash LED,
connect FLOUTA and FLOUTB together. For two flash LEDs, each output will conduct
50% of the total flash output current.
Flash current setting input. A 107kresistor from RSET to AGND sets the maximum
flash current available at FLOUTA and FLOUTB to 1.5A. Each FLOUTA and FLOUTB
channel will conduct 50% of the maximum programmed current. The EUP2471’s
flash-to-movie-mode ratio is fixed at 6.1:1.
Thermal paddle (bottom); Connect EP to PGND as close as possible to the EUP2471.
DS2471 Ver1.0 Mar. 2011
2


Part Number EUP2471
Description 1.5A Dual WLED Flash Driver
Maker Eutech Microelectronics
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