ia2521 integration, ia2521 Datasheet

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ia2521

Manufacturer Part Number
ia2521
Description
Ia2521 Camera Flash Led Driver
Manufacturer
integration
Datasheet
1.IA2521.pdf (12 pages)
IA2521 Camera Flash
LED Driver
DESCRIPTION
IA2521 is a low-cost integrated synchronous buck-boost converter IC
specifically designed for driving camera flash LEDs, both for flash and for
flashlight (torch) operation. It can be operated from a single Lithium cell or
two alkaline cells, and drives a single LED with high efficiency at up to 2W of
continuous power, with pulses up to 4W. The IA2521 device has its torch-
mode output current controlled by a resistor to ground, flash-mode current
controlled by a resistor to logic, and pulse time controlled by an ENABLE
signal. Full flash brightness is reached as quickly as a xenon tube. The
IA2521 incorporates spread-spectrum switching to minimize EMI, is self-
protected against open-string conditions and thermal overloads, and is
available in an MSOP-8 and QFN16 3x3 packages.
2.5- 4.2V
IA2521-DS rev 1.1r 0208
ENABLE
TYPICAL APPLICATION DIAGRAM
C1
FLASH ON
R1
1
2
3
4
IA2521
L1
U1
8
7
6
5
R2
C2
PRELIMINARY
D1
FEATURES
• Buck-boost converter for LED camera flash
• Full flash brightness in 100µsec
• High-efficiency synchronous operation, no
• Battery voltage higher or lower than LED
• Flashlight mode
• Spread-spectrum switching for EMI control
• Up to 2W continuous, 4W pulse output
• 2.5V to 5.5V input voltage range
• Single resistor for each brightness setting
• Self-protected against open string and
• Inductor current is automatically current-
• 1µA maximum shutdown current
• MSOP-8 and QFN16 3x3 packages
diodes; up to 95% efficiency
voltage
power
thermal overload
limited
See back page for ordering information.
PIN ASSIGNMENT
IA2521
www.integration.com
1

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ia2521 Summary of contents

Page 1

... It can be operated from a single Lithium cell or two alkaline cells, and drives a single LED with high efficiency continuous power, with pulses up to 4W. The IA2521 device has its torch- mode output current controlled by a resistor to ground, flash-mode current controlled by a resistor to logic, and pulse time controlled by an ENABLE signal ...

Page 2

... Torch-Mode Current Set. A resistor to ground sets the output current. LED LED Anode. Output power. Connect this pin to the anode of the LED, along with a capacitor. GND Ground. LX2 LX2 LED LED IA2521 MSOP-8 QFN16 3x3 2 ...

Page 3

... Note 3. The device is not designed to function outside its operating ratings. Min Max -0.3 +6.5 -0.3 +6.5 -0.3 VCC + 0.3 2 -50 50 445 8.1 900 16.4 -40 +85 Power Limited − +150 260 Min Max 3.0 4.3 250 1 5 IA2521 Units mW/°C mW mW/°C °C J °C °C Units ...

Page 4

... Cycles 6.0 150 30 IA2521 Units µ µA µsec µsec mΩ mΩ µsec kHz % % % % % V °C °C 4 ...

Page 5

... In this condition, there is extremely low leakage current into the IC, and no current into the LED. Open LED If the output of the IA2521 device is open, as might happen if the LED fails open, the output voltage of the IA2521 will approximately 6V. The IC will not be damaged by this condition ...

Page 6

... Torch to Flash Rise Time Time (50µsec/div) Output Current vs Temperature 208 206 204 202 200 198 196 194 192 190 -40 -20 0 Temperature (ºC) 400 350 300 250 200 150 100 1.00 Turn-on Time Time (500µsec/div) Output Current vs Inverse Rtorch 3.00 5.00 7.00 Inverse Rtorch (µS) IA2521 9.00 6 ...

Page 7

... Voltage (V) 700 650 600 550 500 450 400 350 300 -40 Output Current vs Inverse Rflash (Rtorch = 300KΩ) 1000 900 ILED = 200mA 800 700 600 500 400 300 200 100 0 1.00 4 4.5 Switching Frequency vs Temperature - Temperature (ºC) IA2521 3.00 5.00 7.00 9.00 11.00 Inverse Rflash (µ 13.00 15.00 7 ...

Page 8

... LXHL-PW09 R1 Any R2 Any L1 Any U1 IA2521 IA2521 FLASH ON Quantity Description 2 2.2µF, 6.3V Ceramic Cap 1 3W Super-Bright White LED, Luxeon III Emitter 1 100KΩ 1 240KΩ 1 1.5µH, 31mΩ 1 Camera Flash LED Driver Notes 0805 I SAT > 1.8A IA2521 8 ...

Page 9

... Dimensions and tolerance per ANSI Y14.5M-1982. Dimensions A and B are datums and datum surface. Controlling dimensions: Millimeters Dimension A and B do not include mold flash. Mold flash shall not exceed 0.15mm [0.006] per side. Dimension D does not include interlead flash. Interlead flash shall not exceed 0.25 mm [0.010]. IA2521 9 ...

Page 10

... Dimensions and tolerance per ANSI Y14.5M-1982. Dimensions A and B are datums and datum surface. Controlling dimensions: Millimeters Dimension A and B do not include mold flash. Mold flash shall not exceed 0.15mm [0.006] per side. Dimension D does not include interlead flash. Interlead flash shall not exceed 0.25 mm [0.010]. IA2521 10 ...

Page 11

... This page has been intentionally left blank. IA2521 11 ...

Page 12

... RELATED PRODUCTS AND DOCUMENTS IA2521 Camera Flash LED Driver DESCRIPTION IA2521 MSOP-8 IA2521 QFN16 3x3 Demo Boards and Development Kits DESCRIPTION TBD TBD Related Resources DESCRIPTION TBD TBD TBD TBD Note: Volume orders must include chip revision to be accepted. Integration Associates, Inc. ...

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