ZXLD1350ET5TA Diodes Zetex, ZXLD1350ET5TA Datasheet - Page 20

• Manufacturer Part Number: ZXLD1350ET5TA
• Description: IC LED DRIVR WHITE BCKLGT TSOT-5
• Manufacturer: Diodes Zetex
• Type: Backlight, White LEDr

Specifications of ZXLD1350ET5TA

• Topology: PWM, Step-Down (Buck)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: Automotive
• Type - Secondary: High Brightness LED (HBLED), White LED
• Frequency: 1MHz
• Voltage - Supply: 7 V ~ 30 V
• Voltage - Output: 30V
• Mounting Type: Surface Mount
• Package / Case: TSOT-23-5, TSOT-5, TSOP-5
• Operating Temperature: -40°C ~ 105°C
• Current - Output / Channel: 350mA
• Internal Switch(s): Yes
• Efficiency: 95%
• Operating Supply Voltage (typ): 9/12/15/18/24V
• Number Of Segments: 3
• Operating Temperature (min): -40C
• Operating Temperature (max): 105C
• Operating Temperature Classification: Industrial
• Package Type: TSOT-23
• Pin Count: 5
• Mounting: Surface Mount
• Power Dissipation: 450mW
• Operating Supply Voltage (min): 7V
• Operating Supply Voltage (max): 30V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ZXLD1350ET5TR

ZXLD1350
Document number: DS33468 Rev. 8 - 2
Application Information (Continued)
Layout considerations
LX pin
The LX pin of the device is a fast switching node, so PCB tracks should be kept as short as possible. To minimize ground
'bounce', the ground pin of the device should be soldered directly to the ground plane.
Coil and decoupling capacitors
It is particularly important to mount the coil and the input decoupling capacitor close to the device to minimize parasitic
resistance and inductance, which will degrade efficiency. It is also important to take account of any track resistance in series
with current sense resistor RS.
ADJ pin
The ADJ pin is a high impedance input, so when left floating, PCB tracks to this pin should be as short as possible to reduce
noise pickup. A 100nF capacitor from the ADJ pin to ground will reduce frequency modulation of the output under these
conditions. An additional series 10kΩ resistor can also be used when driving the ADJ pin from an external circuit (see below).
This resistor will provide filtering for low frequency noise and provide protection against high voltage transients.
High voltage tracks
Avoid running any high voltage tracks close to the ADJ pin, to reduce the risk of leakage due to board contamination. Any
such leakage may raise the ADJ pin voltage and cause excessive output current. A ground ring placed around the ADJ pin
will minimize changes in output current under these conditions.
10k
GND
100nF
ADJ
ZXLD1350
GND
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30V 350mA LED DRIVER with AEC-Q100
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ZXLD1350
March 2011