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PDF IS31BL3231 Data sheet ( Hoja de datos )
| Número de pieza | IS31BL3231 | |
| Descripción | FLASH LED DRIVER | |
| Fabricantes | ISSI | |
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IS31BL3231
FLASH LED DRIVER
GENERAL DESCRIPTION
The IS31BL3231 is a current-regulated charge pump
and ideal for powering high brightness LEDs for camera
flash and torch applications. The charge pump can be
set to regulate two current levels for FLASH and TORCH
modes. The IS31BL3231 automatically switches
between linear and boost modes ensuring that LED
current does not depend on the LED forward voltage.
IS31BL3231 provides low cost, space saving solution for
driving LED. It also integrates thermal and short circuit
protection function.
IS31BL3231 is available in DFN-10 (3mm × 3mm). It
operates from 2.7V to 5.5V over the temperature range
of -40°C to +85°C.
January 2012
FEATURES
Operates from 2.7V to 5.5V
Up to 90% efficiency in Torch Mode
Output current up to 750mA
Adjustable output current in Flash Mode
Minimum external components, no external
inductor required
Automatic boost mode
Less than 1µA shutdown current
Low ripple and EMI
Over voltage protection on output
Short and over temperature protections
Available in DFN-10 (3mm × 3mm) package
APPLICATIONS
White LED backlighting
Cellular phones
Generic lighting/flash/strobe applications
TYPICAL APPLICATION CIRCUIT
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Figure 1 Typical Application Circuit
Copyright © 2011 Integrated Silicon Solution, Inc. All rights reserved. ISSI reserves the right to make changes to this specification and its products at any
time without notice. ISSI assumes no liability arising out of the application or use of any information, products or services described herein. Customers are
advised to obtain the latest version of this device specification before relying on any published information and before placing orders for products.
Integrated Silicon Solution, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction of the
product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not
authorized for use in such applications unless Integrated Silicon Solution, Inc. receives written assurance to its satisfaction, that:
a.) the risk of injury or damage has been minimized;
b.) the user assume all such risks; and
c.) potential liability of Integrated Silicon Solution, Inc is adequately protected under the circumstances
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 01/03/2011
1
datasheet pdf - http://www.DataSheet4U.net/
1 page  
IS31BL3231
TYPICAL PERFORMANCE CHARACTERISTICS
250
200
150
100
50 Torch Mode
ILED = 200mA
VOUT = 3.45V
0
3 3. 2 3. 4 3. 6 3. 8
4
Supply Voltage(V)
Figure 2 Supply Voltage vs. Output Current (Torch Mode)
4. 2
EN Pin
5V/Div
VCC = 3.6V
Torch Mode
ILED = 200mA
RFB = 0.22Ω
800
Flash Mode
700 ILED = 700mA
VOUT = 3.73V
600
500
400
300
200
100
0
3 3. 2 3. 4 3. 6 3. 8 4 4. 2
Supply Voltage(V)
Figure 3 Supply Voltage vs. Output Current (Flash Mode)
EN Pin
5V/Div
VCC = 3.6V
Flash Mode
ILED = 700mA
VOUT
1V/Div
IIN
500mA/Div
Figure 4 EN On (Torch Mode)
FLASH Pin VCC = 3.6V
5V/Div
Torch Mode to Flash Mode
VOUT
1V/Div
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IIN
500mA/Div
Figure 5 EN On (Flash Mode)
FLASH Pin VCC = 4.2V
5V/Div
Torch Mode to Flash Mode
VOUT
1V/Div
VFB
0.2V/Div
IOUT
1A/Div
Figure 6 Torch Mode to Flash Mode
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 01/03/2011
VOUT
1V/Div
VFB
0.2V/Div
IOUT
1A/Div
Figure 7 Torch Mode to Flash Mode
5
datasheet pdf - http://www.DataSheet4U.net/
5 Page | ||
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| PDF Descargar | [ Datasheet IS31BL3231.PDF ] | |
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