SC440MLTRT Semtech, SC440MLTRT Datasheet - Page 9

• Manufacturer Part Number: SC440MLTRT
• Description: IC LED DRVR WHITE BCKLGT 24-MLPQ
• Manufacturer: Semtech
• Type: Backlight, White LEDr

Specifications of SC440MLTRT

• Constant Current: Yes
• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 6
• Internal Driver: Yes
• Type - Primary: Backlight
• Frequency: 640kHz ~ 960kHz
• Voltage - Supply: 4.5 V ~ 21 V
• Voltage - Output: 40V
• Mounting Type: Surface Mount
• Package / Case: 24-MLPQ
• Current - Output / Channel: 30mA
• Internal Switch(s): Yes
• Efficiency: 91%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Operating Temperature: -
• Other names: SC440MLTR

Pin Descriptions
Table 1.
Note: When EN = 0; the boost is turned OFF and disabled.
© 2010 Semtech Corp.
Pin #
8, 12
9, 10
11
13
14
15
16
17
18
19
20
21
22
23
24
1
2
3
4
5
6
7
T
EN
0
1
Thermal Pad
Pin Name
OVPRTN
SCP_EN
IOGND
FFLAG
OVPIN
AGND
PGND
COMP
IOSET
VOUT
PWM
N/C
IO1
VIN
IO6
IO5
IO4
IO3
IO2
SW
EN
SS
NOT RECOMMENDED FOR NEW DESIGNS: SEE SC440A
Pin Function
Provides constant current source to LED string 1.
Analog ground
Power failure signal output with open collector.
Enable the device including requlator and LED drivers.
Soft-start pin
Over-voltage return
Over-voltage input
Power ground
Collector of the internal power transistor – connect to the boost inductor and the rectifying diode.
Left open.
Input power supply.
Current source IO value set pin – by selecting the resistor connected from this pin to GND, the
corresponding maximum current on all 6 strings are set.
LED short-circuit protection pin – leaving this pin open enables the function, tying it to ground
disables it. If any IO pin connects to VIN, SCP_EN needs to be left open to activate the protection.
The output of the internal transconductance error amplifier – this pin is used for loop compensation.
Output voltage pin – internal over-voltage Connect the output capacitor and the anode of
control pin for LED backlight strings.
PWM control pin for LED backlight strings.
Provides constant source current to LED string 6.
Provides constant source current to LED string 5.
Provides constant source current to LED string 4.
Constant current source ground, tying to AGND.
Provides constant source current to LED string 3.
Provides constant source current to LED string 2.
Thermal pad for heatsinking purposes — connect — not connected internally
backlight disable
backlight enable
STATUS
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