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LM3550SPX/NOPB Datasheet(PDF) 3 Page - Texas Instruments

Part # LM3550SPX/NOPB
Description  LM3550 5-A Super-Capacitor Flash LED Driver
PDF  43 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

LM3550SPX/NOPB Datasheet(HTML) 3 Page - Texas Instruments

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Die-Attach
Pad (DAP)
GND
2
3
4
5
1
14
13
12
11
15
Die-Attach
Pad (DAP)
GND
2
3
4
5
1
14
13
12
11
15
3
LM3550
www.ti.com
SNVS569C – MAY 2009 – REVISED OCTOBER 2016
Product Folder Links: LM3550
Submit Documentation Feedback
Copyright © 2009–2016, Texas Instruments Incorporated
5 Pin Configuration and Functions
NHU Package
16-Pin UQFN
Top View
NHU Package
16-Pin UQFN
Bottom View
Pin Functions
PIN
TYPE
DESCRIPTION
NAME
NUMBER
ALD/TEMP
12
Input
Ambient light sensor or temperature monitoring pin. For ambient light sensing, connect a
light sensor or photo-diode and a resistor to this pin. For temperature monitoring, connect a
NTC thermistor from VCC to the NTC pin and a resistor from the NTC pin to ground.
BAL
2
Power
Super-capacitor active balance pin
C1+
20
Power
Flying capacitor pins. Connect a 1-µF ceramic capacitor from C1+ to C1
− and C2+ to C2−.
C1–
18
C2+
15
C2–
16
EOC
6
Output
End-of-charge output/ flash ready. The EOC pin transitions from high to low when an end of
charge flash ready. The EOC pin transitions from high to low when an end of charge state
has been reached
FB
5
Input
Programmable feedback voltage pin
FET_CON
4
Output
External FET controller. Connect gate of flash NFET to this pin.
IND
13
Output
Indicator LED current source. Drives one red LED with a 5-mA current
LED-
3
Input
Regulated current sink input for torch mode
SCL
10
Input
I2C serial clock pin
SDA
8
Input/Outp
ut
I2C serial data I/O pin
STROBE
11
Input
Manual flash enable pin. The STROBE pin can be configured to be rising-edge sensitive with
the flash timing controlled internally, or level sensitive with the flash timing being controlled
externally.
VIN
14
Input
Input voltage connection. A 1-μF ceramic capacitor is required from VIN to GND.
VOUT
1
Output
Charge pump output. A 1-μF ceramic capacitor is required from VOUT to GND. Connect the
flash LED anodes and super-capacitor to this pin.
GND
7,9,17,19, DAP
Ground
Ground pins – these pins should be connected directly to a low-impedance ground plane.



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