SC4538ULTRT Semtech, SC4538ULTRT Datasheet - Page 8

• Manufacturer Part Number: SC4538ULTRT
• Description: IC LED DRIVR WHITE BCKLGT MLPD-8
• Manufacturer: Semtech
• Type: Backlight, White LEDr

Specifications of SC4538ULTRT

• Constant Current: Yes
• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: Backlight
• Frequency: 680kHz ~ 920kHz
• Voltage - Supply: 2.8 V ~ 5.5 V
• Voltage - Output: 5 V ~ 38 V
• Mounting Type: Surface Mount
• Package / Case: MLPD-8
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 30mA
• Internal Switch(s): Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Efficiency: -
• Other names: SC4538ULTR

Pin Descriptions
Pin #
1
2
3
4
5
6
7
8
T
Thermal Pad
Pin Name
COMP
GND
OUT
ISET
EN
LX
BL
IN
Collector of the internal power transistor — connect to the boost inductor and rectifying Schottky
diode.
Enable and brightness control pin for LED string
Output current set pin — connect a resistor from this pin to GND to set the maximum current.
Output of the internal transconductance error amplifi er — this pin is used for loop
compensation and soft-start. Connect a 1.27k
Boost output voltage monitor pin — internal over-voltage protection monitors the voltage at this
pin. Connect this pin to the output capacitor and the anode of the LED string.
LED constant current sink — connect this pin to the cathode of the LED string
Ground
Power supply pin — bypass this pin with a capacitor close to the pin
Pad for heatsinking purposes — connect to the ground plane using multiple vias.
Not connected internally.
Pin Function
Ω
resistor and 47nF capacitor in series to GND.
SC4538
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