SC443ULTRT Semtech, SC443ULTRT Datasheet - Page 9

• Manufacturer Part Number: SC443ULTRT
• Description: TVS
• Manufacturer: Semtech

Specifications of SC443ULTRT

• Constant Current: *
• Constant Voltage: *
• Topology: *
• Number Of Outputs: *
• Internal Driver: *
• Type - Primary: *
• Type - Secondary: *
• Frequency: *
• Voltage - Supply: *
• Voltage - Output: *
• Mounting Type: Surface Mount
• Package / Case: 16-UFQFN Exposed Pad
• Operating Temperature: *
• Current - Output / Channel: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: SC443ULTRTTR

© 2008 Semtech Corp.
Pin Descriptions
Table 1.
Note: When EN = 0; the boost is turned OFF and disabled.
Pin #
0

2
3
4
5
6

2
3
4
5
6
7
8
9
T
EN
0

Thermal Pad
Pin Name
IOGND
OVPIN
COMP
AGND
PGND
IOSET
VOUT
PWM
FSET
VIN
IO3
IO2
IO
SW
EN
SS
backlight disable
backlight enable
STATUS
Pin Function
Output voltage pin and internal pull down current source in over voltage fault. Connect the output capacitor and
the anode of the LED strings to this pin.
Power ground
Collector of the internal power transistor – connect to the boost inductor and the rectifying diode.
Input voltage supply for IC. Bypassed with capacitors close to the pin.
PWM control pin for LED backlight strings, Connect to GND to disable the IO’s.
Over-voltage input
Soft-start pin
Current source IO value set pin – by selecting the resistor connected from this pin to GND, the corresponding
maximum current on all 3 strings are set.
The output of the internal transconductance error amplifier – this pin is used for loop compensation.
Provides constant source current to LED string 3.
Provides constant source current to LED string 2.
LED ground
Provides constant current source to LED string .
Analog ground
External resistor setting switching frequency
Enable the device including requlator and LED drivers.
Thermal pad for heatsinking purposes — connect to ground plane using multiple vias — not connected internally.
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