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ZXLD1350EV2
ZXLD1350EV2 User Guide Iss 5 10-04-07
ZXLD1350 DEVICE DESCRIPTION
The ZXLD1350 is a continuous mode inductive driver in a TSOT23-5 package, for driving one or more series
connected LEDs efficiently from a voltage source higher than the LED voltage. The device includes the output
switch and a current sense circuit, which requires an external sense resistor to set the nominal current up to
350mA.
ZXLD1350 DEVICE FEATURES
• Drives one or more series-connected 1W white
LEDs up to 350mA.
• Internal 30V switch.
• Wide input voltage: 7V to 30V.
• Inherent open circuit LED protection.
• Brightness control using DC or PWM.
• Internal PWM filter.
DEVICE APPLICATIONS
• LED flashlights.
• High Power LED driving.
• Low-voltage halogen replacement LEDs.
• Automotive lighting.
• Illuminated signs.
ZXLD1350 Device Packages, Pin and Definitions
TSOT23-5 pack
ZXLD1350 Device Pin Definition
Name Pin No Description
LX 1 Drain of NDMOS switch.
GND 2 Ground (0V).
ADJ 3 Internal voltage ref. pin (1.25V) :
• Leave floating for normal operation.
• Connect to GND to turn off output current.
• Drive with DC voltage (0.3V to 1.25V) or with PWM signal to adjust
output current or....
• Connect a capacitor from this pin to ground to set soft-start time.
ISENSE 4 Connect a sense resistor, Rs,
from the ADJ pin to VIN to sense the nominal
output current. Nominal I
out
= 0.1/ Rs
VIN 5 Input voltage: 7V to 30V. Decouple to ground with a 1uF or higher ceramic
capacitor.
ORDERING INFORMATION
EVALBOARD ORDER NUMBER
ZXLD1350EV2
Please note: Evaluation boards are subject to
availability and qualified leads.
DEVICE ORDER NUMBER
ZXLD1350E5T A