LM3561 Datasheet, PDF (3/36 Pages) Texas Instruments – LM3561 Synchronous Boost Converter with 600mA High Side LED Driver and I 2 C-Compatible Interface

Application Circuit Component List
Component
L
COUT
CIN
LEDs
Manufacturer
TDK
Murata
Murata
Lumiled
Value
1µH
10µF
10µF
3.6V@1A
Part Number
MLP2520-1R0
GRM188R60J106M
GRM188R60J106M
LXCL-PWF4
Connection Diagram
Size (mm)
2x2.5x1.2
1.6×0.8×0.8 (0603)
1.6×0.8×0.8 (0603)
Rating
1.5A
6.3V
6.3V
1.5A
30113903
Pin Descriptions
Pin
Name
Function
A1
GND
Ground
A2
IN
Input Voltage Connection. Connect IN to the input supply and bypass to GND with a minimum
10µF ceramic capacitor.
A3
HWEN
Active Low Hardware Reset Input. This input is high impedance and cannot be left floating.
Typically this would be tied to a pullup resistor and to a logic high voltage, or VIN, in order to enable
the LM3561.
B1
SW
Drain Connection for Internal NMOS and Synchronous PMOS Switches
STROBE Active High Hardware Flash Enable. Drive STROBE high to turn on the Flash pulse. STROBE has
B2
an internal 300kΩ pulldown to GND.
B3
SCL
Serial Clock Input.
C1
OUT
Step-Up DC/DC Converter Output. Bypass OUT to GND with a 10µF Ceramic Capacitor.
C2
TX1/TORCH/ Configurable as a Flash Interrupt Input, a Hardware Torch Enable, or a Programmable General
GPIO
Purpose Logic Input/Output. This pin has an internal 300kΩ pulldown to GND.
C3
SDA
Serial Data Input/Output.
D1
LED
High Side Current Source Output for Flash LED.
D2
LEDI/NTC
Configurable as a High Side Current Source Output for Indicator LEDs or as a Threshold Detector
for LED Temperature Sensing.
Configurable as a Flash Interrupt Input, a Programmable General Purpose Logic Input/Output, or
D3
TX2/GPIO2/INT
as an Interrupt output for fault notification. This pin has an internal 300kΩ pulldown to GND.
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