Datasheet
© Semiconductor Components Industries, LLC, 2009
January, 2009 − Rev. 3
1 Publication Order Number:
NCP3066/D
NCP3066, NCV3066
Up to 1.5 A Constant
Current Switching
Regulator for LEDs with
ON/OFF
Function
The NCP3066 is a monolithic switching regulator designed to
deliver constant current for powering high brightness LEDs. The
device has a very low feedback voltage of 235 mV (nominal) which is
used to regulate the average current of the LED string. In addition, the
NCP3066 has a wide input voltage up to 40 V to allow it to operate
from a 12 Vac or a 12−36 Vdc supply, commonly used for lighting
applications as well as unregulated supplies such as rechargeable
batteries. The NCP3066 switching regulator can be configured in
Step−Down (Buck), Step−Up (Boost) and Voltage−Inverting
topologies with a minimum number of external components. The
ON/OFF pin provides PWM dimming capability or a low power
shutdown mode.
Features
• Integrated 1.5 A Switch
• Input Voltage Range from 3.0 V to 40 V
• Logic Level Shutdown Capability
• Low Feedback Voltage of 235 mV
• Cycle−by−Cycle Current Limit
• No Control Loop Compensation Required
• Frequency of Operation Adjustable up to 250 kHz
• Analog and Digital PWM Dimming Capability
• Internal Thermal Shutdown with Hysteresis
• NCV Prefix for Automotive and Other Applications Requiring Site
and Control Changes
• These are Pb−Free Devices
Applications
• Automotive and Marine Lighting
• Constant Current Source, High Brightness LED Driver
• Low Voltage and Landscape Lighting
ON/OFF
Ipk
COMP
SWC
SWE
CT
GND
V
CC
ON/OFF
V
CC
GND
C
IN
C
T
LED−
LED+
L
1
R
sense
D
1
NCP3066
C
OUT
LED
1
LED
n
Figure 1. Typical Buck Application Circuit
R
s
PDIP−8
P, P1 SUFFIX
CASE 626
http://onsemi.com
MARKING
DIAGRAMS
DFN8
MN SUFFIX
CASE 488AF
SOIC−8
D SUFFIX
CASE 751
1
8
NCP3066
AWL
YYWWG
NCP3066 = Specific Device Code
A = Assembly Location
L, WL = Wafer Lot
Y, YY = Year
W, WW = Work Week
G or G = Pb−Free Package
(Note: Microdot may be in either location)
See detailed ordering and shipping information in the package
dimensions section on page 17 of this data sheet.
ORDERING INFORMATION
ALYWG
G
1
1
8
3066
ALYWG
G
3066
1