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
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MARKING
DIAGRAMS
3066
ALYWG
G
1
8
1
SOIC−8
D SUFFIX
CASE 751
•
•
•
•
•
•
•
•
•
•
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
NCP3066
AWL
YYWWG
8
1
PDIP−8
P, P1 SUFFIX
CASE 626
3066
ALYWG
G
•
Automotive and Marine Lighting
•
Constant Current Source, High Brightness LED Driver
•
Low Voltage and Landscape Lighting
ON/OFF
R
sense
ON/OFF
Ipk
NCP3066
SWC
L
1
LED+
LED
1
C
OUT
D
1
LED
n
LED−
C
T
R
s
1
DFN8
MN SUFFIX
CASE 488AF
SWE
CT
V
CC
C
IN
V
CC
COMP
GND
GND
Figure 1. Typical Buck Application Circuit
©
Semiconductor Components Industries, LLC, 2009
January, 2009
−
Rev. 3
ÇÇ
ÇÇ
ÇÇ
ÇÇ
ÇÇ
ÇÇ
ÇÇ
ÇÇ
Ç
Ç
Ç
Ç
Ç
Ç
Ç
Ç
NCP3066
A
L, WL
Y, YY
W, WW
G or
G
=
=
=
=
=
=
Specific Device Code
Assembly Location
Wafer Lot
Year
Work Week
Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 17 of this data sheet.
1
Publication Order Number:
NCP3066/D
NCP3066, NCV3066
SOIC−8/PDIP−8
Switch Collector
Switch Emitter
Timing Capacitor
GND
2
3
4
(Top View)
1
8
7
6
5
ON/OFF
I
pk
Sense
V
CC
Comparator
Inverting
Input
NOTE:
DFN8
Switch Emitter
Timing Capacitor
EP Flag
GND
(Top View)
EP Flag must be tied to GND Pin 4 on PCB
Figure 2. Pin Connections
Figure 3. Pin Connections
8
ON/OFF
ON/OFF
TSD
1
Bias
R
S
7
I
pk
Sense
Comparator
−
+
0.2 V
6
V
CC
Comparator
+
−
0.235V
Reference
Regulator
4
S
R
2
Q
CT
3
Q
Switch Collector
Switch Emitter
Oscillator
Timing Capacitor
GND
5
Comparator Inverting Input
Figure 4. Block Diagram
PIN DESCRIPTION
Pin No.
PDIP8
1
2
3
4
5
6
7
8
DFN8
1
2
3
4, EP Flag
5
6
7
8
Pin Name
Switch Collector
Switch Emitter
Timing Capacitor
GND
Comparator Inverting Input
V
CC
I
pk
Sense
ON/OFF
Description
Internal Darlington switch collector.
Internal Darlington switch emitter.
Timing Capacitor to control the switching frequency.
Ground pin for all internal circuits.
Inverting input pin of internal comparator.
Voltage Supply
Peak Current Sense Input to monitor the voltage drop across an external
resistor to limit the peak current through the circuit.
ON/OFF Pin. To disable the device, this input should be pulled below
0.8 V. If the pin is left floating, it will be disabled.
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2
Ç
Ç
Ç
Ç
ÇÇ
ÇÇ
ÇÇ
ÇÇ
Switch Collector
ON/OFF
I
pk
Sense
V
CC
Comparator
Inverting
Input
NCP3066, NCV3066
MAXIMUM RATINGS
(measured vs. Pin 4, unless otherwise noted)
Rating
VCC Pin 6
Comparator Inverting Input Pin 5
Darlington Switch Collector Pin 1
Darlington Switch Emitter Pin 2 (Transistor OFF)
Darlington Switch Collector to Emitter Pins 1−2
Darlington Switch Current
I
pk
Sense Pin 7
Timing Capacitor Pin Voltage (Pin 3)
Moisture Sensitivity Level
Lead Temperature Soldering
ON/OFF Pin voltage
POWER DISSIPATION AND THERMAL CHARACTERISTICS
PDIP−8 (Note 5)
Thermal Resistance Junction−to−Air
SOIC−8 (Note 5)
Thermal Resistance Junction−to−Air
DFN−8 (Note 5)
Thermal Resistance Junction−to−Air
Thermal Resistance Junction−to−Case
Storage Temperature Range
Maximum Junction Temperature
Operating Junction Temperature Range (Note 3)
NCP3066
NCV3066
R
qJA
R
qJA
100
180
78
14
−65
to +150
+150
0 to +85
−40
to +125
°C/W
°C/W
°C/W
Symbol
V
CC
V
CII
V
SWC
V
SWE
V
SWCE
I
SW
V
IPK
V
TC
MSL
T
SLD
V
ON/OFF
Value
0 to +42
−0.3
to + V
CC
−0.3
to + 42
−0.6
to + V
CC
−0.3
to + 42
1.5
−0.3
to V
CC
+ 0.3
−0.2
to +1.4
1
260
(−0.3 to +25) < V
CC
Unit
V
V
V
V
V
A
V
V
−
°C
V
R
qJA
R
qJC
T
STG
T
JMAX
T
J
°C
°C
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. This device series contains ESD protection and exceeds the following tests:
Pin 1−8: Human Body Model 2000 V per AEC Q100−002; 003 or JESD22/A114; A115
Machine Model Method 200 V
2. This device contains latch−up protection and exceeds 100 mA per JEDEC Standard JESD78.
3. The relation between junction temperature, ambient temperature and Total Power dissipated in IC is T
J
= T
A
+
R
q
•
P
D
.
4. The pins which are not defined may not be loaded by external signals.
5. 35
mm
copper, 10 cm
2
copper area.
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3
NCP3066, NCV3066
ELECTRICAL CHARACTERISTICS
(V
CC
= 5.0 V,
−40°C
< T
J
< +125°C for NCV3066, 0°C < T
J
< +85°C for NCP3066 unless
otherwise specified)
Symbol
OSCILLATOR
f
OSC
Frequency
(V
Pin5
= 0 V, C
T
= 2.2 nF,
T
J
= 25°C)
(Pin 7 to V
CC
, T
J
= 25°C)
(Pin 7 to V
CC
, T
J
= 25°C)
(Pin 7 to V
CC
, T
J
= 25°C)
(T
J
= 25°C) (Note 7)
165
110
5.5
150
6.0
1650
275
200
235
190
6.5
kHz
−
mA
mA
mV
Characteristic
Conditions
Min
Typ
Max
Unit
I
DISCHG
/I
CHG
Discharge to Charge Current Ratio
I
DISCHG
I
CHG
V
IPK(Sense)
Capacitor Discharging Current
Capacitor Charging Current
Current Limit Sense Voltage
OUTPUT SWITCH
(Note 6)
V
SWCE(DROP)
Darlington Switch Collector to
Emitter Voltage Drop
I
C(OFF)
V
TH
Collector Off−State Current
(I
SW
= 1.0 A, T
J
= 25°C)
(Note 6)
(V
CE
= 40 V)
T
J
= 25°C
T
J
= 0°C to 85°C
T
J
=
−40°C
to +125°C
REG
LiNE
I
CII in
V
IH
V
IL
I
IH
I
IL
T
ON_MIN
I
CC
Threshold Voltage Line Regulation
Input Bias Current
(V
CC
= 3.0 V to 40 V)
(V
in
= V
th
)
T
J
= 25°C
T
J
= 0°C to +85°C
= 25°C
T
J
= 0°C to +85°C
J
1.0
1.0
1.3
10
V
mA
COMPARATOR
Threshold Voltage
235
−5%
−10%
−6.0
−1000
235
235
2.0
−100
+5%
+10%
6.0
1000
mV
nA
mV
ON/OFF FEATURE
ON/OFF Pin Logic Input Level High
V
OUT
= 0 V
ON/OFF Pin Logic Input Level Low
V
OUT
= Nominal Output Voltage
ON/OFF Pin Input Current
ON/OFF Pin = 5 V (ON)
ON/OFF Pin Input Current
ON/OFF Pin = 0 V (OFF)
ON/OFF Pin Minimum Width
2.2
2.4
−
−
−
−
−
−
15
1.0
50
−
−
1.0
0.8
V
V
mA
mA
ms
T
J
= 25°C
T
J
= 25°C
T
J
= 25°C
(V
CC
= 5.0 V to 40 V,
CT = 2.2 nF, Pin 7 = V
CC
,
V
Pin
5 > V
th
, Pin 2 = GND,
remaining pins open)
ON/OFF Pin = 5.0 V (OFF)
T
J
= 25°C
T
J
=
−40°C
to +125°C
TOTAL DEVICE
Supply Current
7.0
mA
I
STBY
Standby Quiescent Current
85
160
10
120
120
mA
T
SHD
T
SHDHYS
Thermal Shutdown Threshold
Hysteresis
°C
°C
6. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.
7. The V
IPK
(Sense) Current Limit Sense Voltage is specified at static conditions. In dynamic operation the sensed current turn−off value
depends on comparator response time and di/dt current slope. See the Operating Description section for details.
8. NCV prefix is for automotive and other applications requiring site and change control and extended operating temperature conditions.
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4
NCP3066, NCV3066
350
300
FREQUENCY (kHz)
FREQUENCY (kHz)
0
2
4
6
8
10
12
14
16
18
20
250
200
150
100
50
0
150
145
140
135
130
125
120
0
5
10
15
20
25
30
35
40
Ct, CAPACITANCE (nF)
V
IN
, INPUT VOLTAGE (V)
Figure 5. Oscillator Frequency vs.
Timing Capacitor
2.3
2.1
VOLTAGE DROP (V)
1.9
1.7
1.5
1.3
1.1
0.9
−40 −20
0
I
CE
= 0.5 A
I
CE
= 0.25 A
I
CE
= 1.25 A
VOLTAGE DROP (V)
I
CE
= 1 A
I
CE
= 0.75 A
1.3
1.2
1.1
1.0
0.9
0.8
0.7
60
80
100
120
140
Figure 6. Oscillator Frequency vs. Supply
Voltage
I
CE
= 1.25 A
I
CE
= 1 A
I
CE
= 0.75 A
I
CE
= 0.5 A
I
CE
= 0.25 A
0
20
40
60
80
100
120 140
20
40
0.6
−40 −20
T
J
, JUNCTION TEMPERATURE (°C)
T
J
, JUNCTION TEMPERATURE (°C)
Figure 7. Voltage Drop in Emitter Follower
Configuration
Figure 8. Common Emitter Configuration Output
Darlington Switch Voltage Drop vs. Temperature
0.240
REFERENCE VOLTAGE (V)
0.238
0.236
0.234
0.232
0.230
−40 −20
V
ipk
, CURRENT LIMIT SENSE VOLTAGE (V)
0.200
0.195
0.190
0.185
0.180
0.175
0.170
−40 −20
0
20
40
60
80
100
120
140
0
20
40
60
80
100
120 140
T
J
, JUNCTION TEMPERATURE (°C)
T
J
, JUNCTION TEMPERATURE (°C)
Figure 9. V
th
vs. Temperature
Figure 10. Current Limit Sense Voltage vs.
Temperature
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