LED Driver IC
BCR450
Datasheet, Rev. 3.1, Feb. 2013
Power Management and
Multimarket
Edition 2013-02-21
Published by Infineon Technologies AG,
81726 München, Germany
© Infineon Technologies AG 2013.
All Rights Reserved.
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BCR450, LED Driver IC
Revision History: 2013-02-21, Rev. 3.1
Previous Version: 2009-10-15, Rev. 3.0
Page Subjects (major changes since last revision)
Figure 1 Block diagram: Pin 3 (EN), ESD protection and base resistor added
Table 5 Note 1) added to Enable voltage range
Table 6 Typical input capacitance of pin 3 (EN) added
Figure 5 Units added to figure title
Figure 6 Units added to figure title
BCR450
LED Driver IC
Datasheet 3 Rev. 3.1, 2013-02-21
Datasheet 4 Rev. 3.1, 2013-02-21
BCR450
LED Driver IC
BCR450 Power LED Driver IC
1BCR450 Power LED Driver IC
Features
• Low voltage drop across sense resistor, 0.15 V typical
• High output current precision
• Operating voltage fro 8 to 27 V
• Over voltage protection
• Overtemperature current foldback and Thermal shut down
function
• Adjustable Constant LED Current up to 85 mA in stand alone
operation
• Precise Internal bandgap enables High output current accuracy
• Up to 2.5 A LED current possible by using external transistor
• EN Input for PWM LED brightness control and On/Off control
• Very Low Standby Current
• Minimum number of external components required, no inductors
• Very small SC-74 package: 2.9 mm x 2.5 mm x 1.1 mm
Benefits
• High level of colour control due to high output current precision
• Small space requirement
• No electro- magnetic interference
• Active thermal monitoring of chip and LED temperature with
current fold- back to avoid thermal overstress
• Low cost device
• Scalable output stage optimizing cost and space
Typical Applications
• General lighting e.g. retrofits
• Architectural lighting, Medical and Dental lighting
• Transportation like train and aircraft lighting
• Strobe lighting
• Universal constant current source
• Signal and marker lights for orientation or navigation
• LED controller for industrial applications, not qualified to AECQ-
100
3
2
1
4
5
6
6
BCR450
Typical 12V High Power LED Application
Vs
BCX68-25
1
3
2,5
4
350mA
2 Description
The BCR450 is a LED driver IC optimized for usage with an external power transistor for driving LEDs above
100 mA. For currents up to 85 mA the BCR450 can be used in stand alone operation. The output current level can
be adjusted with an external sense resistor.
The IC can be switched on and off by an external signal, which is also suitable to regulate brightness of the LEDs
by PWM dimming.
The precise internal bandgap stabilizes the circuit and provides stable current conditions over temperature range.
Additional features are included to protect the LEDs from overload, short circuit events as well as from over
voltage. The LEDs can be also protected against thermal overload by thermally coupling the LEDs to the BCR450.
BCR450_Block diagram.vsd
6
5
43
2
1Iout
GND
EN
Vs
GND
Vsense
LED Controller
BCR450
Vref
OP
Output
stage Bandgap
BCR450
LED Driver IC
Description
Datasheet 5 Rev. 3.1, 2013-02-21
Figure 1 Block diagram
Pin Definition
Table 1 Pin definition and function
Pin number Pin Symbol Function
1Iout Controlled output current to drive LEDs
2GND IC ground
3EN Power On control voltage pin (PWM input)
4Vsense Sense control voltage pin for internal feedback mechanism
5GND IC ground
6VsSupply voltage
Table 2Marking
Type Marking Package
BCR450 50s SC74
= = =
Source 1 Source 2
Source 3
5V=
S 4
S 7
S 1
R 1
R 2
S 8
S 9
S 6
S 2
S 3
AC Measurement
BCR450_Test circuit.vsd
Source 4
S 5
Source 5
PWM
=Vref
V
s
V
sense
I
Out
EN
GND
+
-
=
~ 150 mV
Vout
Datasheet 6 Rev. 3.1, 2013-02-21
BCR450
LED Driver IC
Description
Figure 2 Electrical test circuit
Thermal resistance
Table 3 Thermal resistance
Parameter Symbol Value Unit
Junction - solder point RthJS 75 K/W
Absolute Maximum Ratings
Table 4 Absolute Maximum ratings
Parameter Symbol Limit Value Unit
Supply voltage Vs 40 V
Sense Voltage Vsense 200 mV
Output current Iout 100 mA
Total Power Dissipation; Ts= 112.5°C Ptot 500 mW
Junction temperature TJ 150 °C
Storage temperature range TSTG -65... 150 °C
ESD capability Human Body Model1)
1) For ESD testing, the chip was mounted in a SC74 package on an application board, where GND is electrically connected
to the chip GND
VESD_HBM 2000 V
BCR450
LED Driver IC
Electrical Characteristics
Datasheet 7 Rev. 3.1, 2013-02-21
3 Electrical Characteristics
3.1 DC Characteristics
8 V < VS < 27 V; - 40 °C < TJ < 150 °C, all voltages with respect to ground; current directions as given in Figure 2;
unless otherwise specified
All parameters are tested at 25 °C, unless otherwise specified
Table 5 DC Characteristics
Parameter Symbol Values Unit Note / Test Condition
Min. Typ. Max.
Overall current consumption Isshort 70 90 mA Is short; Vs = 8..27 V
Vsense = 20 mV
Overall current consumption Isshort 600 μAIs short; Vs = 42 V
Vsense = 20 mV
Overall standby current consumption Isstandby 200 nA EN = 0 V; Vs= 8..27 V
Vsense = 20 mV
Current of enable input IEN 20 40 70 μAVsense = 0..200 mV
Current of driver output Iouthigh 70 90 mA Vsense = 20 mV;
Vs = 8 V
Current of driver output Ioutlow 100 nA Vsense = 200 mV;
Vs = 8V
Current of Sense input Isense 200 nA Vsense = 20..200 mV
Voltage of Driver output Vout 6 V Iout = 15 mA;
S1, S6, S8, S9 = on;
R1 = 390 Ω;
R2 = 10 Ω;
see Figure 2
Voltage of Sense input Vsense 135 150 165 mV Iout = 15 mA;
Vs = 8..27 V
S3, S6, S8 = on;
R1 = 390 Ω;R2 = 10 Ω
TJ = 115 °C
see Figure 2
Enable voltage range UPon -0.3 51)
1) ESD protection diode of pin 3 (EN) will breakdown above 5 V input voltage to GND
V
Control voltage for power on UOn 0.6 0.85 5 V
Control voltage for power off UOff -0.3 0.35 V
Over voltage Protection Vs, OV 27 VIout -> 0 A
Delta sense voltage ΔVsense 210 50 mV Iout: 0 -> 50 mA
Drop Voltage Vs - Vout 1.2 VIout < 40 mA
Temperature shut down TSD 130 150 170 °C Iout -> 0 A; refer to TJ
Datasheet 8 Rev. 3.1, 2013-02-21
BCR450
LED Driver IC
Electrical Characteristics
3.2 Digital Signals
All parameters are tested at 25 °C, unless otherwise specified
Table 6 Digital Control Parameter (EN)
Parameter Symbol Values Unit Note /
Test Condition
Min. Typ. Max.
PWM signal frequency fPWM 1000 Hz tdutycycle = 1%;
signal level
reaches 100% in
on and off mode
PWM Duty cycle tdutyPWM 5 % F = 5 kHz; signal
level reaches
100% in on and off
mode
PWM voltage UPWM 5 V
EN input capacitance to GND CEN 130 pF EN = 0 V
3.3 Transient Parameters
8 V < VS < 27 V; - 40 °C < TJ < 150 °C, all voltages with respect to ground; current directions as given in Figure 2;
unless otherwise specified
All parameters are tested at 25 °C, unless otherwise specified
Table 7 Digital Control Parameter (EN)
Parameter Symbol Values Unit Note / Test Condition
Min. Typ. Max.
Response Time TON 10 μsEN: 0 -> 5 V @ trise < 20 ns
trisetime @(10...90%) * Vsense
(Iout ~ 15 mA);Rsense = 10 Ω
TOFF 70 μsEN: 5 V -> 0 @ tfall < 20 ns
tfalltime @(90...10%) * Vsense
(Iout ~ 15 mA); Rsense = 10 Ω
BCR450
LED Driver IC
Measured Parameters
Datasheet 9 Rev. 3.1, 2013-02-21
4 Measured Parameters
BCR450 IC has been measured in test bench with undefined high thermal resistance
This is valid for all diagramed DC- and AC- Parameters
4.1 DC- Parameter
Vout = 1.0 V, EN = 2.4 V
IS vers Temperature (VS); Vsense = 20 mV
Is vers Temp_Vs_20mV_Vout1V.vsd
I_s_vers Temp; Vs
V_sense = 20 mV; V_out = 1 V; V_en = 2.4 V
60.00
65.00
70.00
75.00
80.00
85.00
90.00
95.00
100.00
105.00
-40 -25 0 25 45 65 85 105 125 150
°C
Is (mA)
Vs_8V
Vs_14V
Vs_27V
Vs_40V
Vs_42V
IS vers Vs (Temperature); Vsense = 20 mV
Is vers Vs_Temp_20mV_Vout1V.vsd
I_s_vers Vs; Temp
V_sense = 20 mV; V_out = 1 V; V_en = 2.4 V
0.00
20.00
40.00
60.00
80.00
100.00
120.00
8 14274042
Vs (V)
Is (mA)
-40°C
-25°C
0°C
25°C
45°C
65°C
85°C
105°C
125°C
150°C
Ien vers Temperature (VS); Vsense = 20 mV
Ien vers Temp_Vs_20mV_Vout1V.vsd
I_en_vers Temp; Vs
V_sense = 20 mV; V_out = 1 V; V_en = 2.4 V
30.00
32.00
34.00
36.00
38.00
40.00
42.00
44.00
46.00
48.00
-40 -25 0 25 45 65 85 105 125 150
°C
Ien (uA)
Vs_8V
Vs_14V
Vs_27V
Vs_40V
Vs_42V
Ien vers Vs (Temperature); Vsense = 20 mV
Ien vers Vs_Temp_20mV_Vout1V.vsd
I_en_vers Vs; Temp
V_sense = 20 mV; V_out = 1 V; V_en = 2.4 V
30.00
32.00
34.00
36.00
38.00
40.00
42.00
44.00
46.00
48.00
8 14274042
Vs (V)
Ien (uA)
-40°C
-25°C
0°C
25°C
45°C
65°C
85°C
105°C
125°C
150°C
Isense vers Temperature (VS); Vsense = 20 mV
Isense vers Temp_Vs_20mV_Vout1V.vsd
I_sense_vers Temp; Vs
V_sense = 20 mV; V_out = 1 V; V_en = 2.4 V
100.00
105.00
110.00
115.00
120.00
125.00
130.00
135.00
140.00
145.00
-40 -25 0 25 45 65 85 105 125 150
°C
Isense (nA)
Vs_8V
Vs_14V
Vs_27V
Vs_40V
Vs_42V
Isense vers Vs (Temperature); Vsense = 20 mV
Isense vers Vs_Temp_20mV_Vout1V.vsd
I_sense_vers Vs; Temp
V_sense = 20 mV; V_out = 1 V; V_en = 2.4 V
100.00
105.00
110.00
115.00
120.00
125.00
130.00
135.00
140.00
145.00
8 14274042
Vs (V)
Isense (nA)
-40°C
-25°C
0°C
25°C
45°C
65°C
85°C
105°C
125°C
150°C
Iout vers Temperature (VS); Vsense = 20 mV
Iout vers Temp_Vs_20mV_Vout1V.vsd
I_out_vers Temp; Vs
V_sense = 20 mV; V_out = 1 V; V_en = 2.4 V
60.00
65.00
70.00
75.00
80.00
85.00
90.00
95.00
100.00
-40 -25 0 25 45 65 85 105 125 150
°C
Iout (mA)
Vs_8V
Vs_14V
Vs_27V
Vs_40V
Vs_42V
Iout vers Vs (Temperature); Vsense = 20 mV
I_out_vers Vs; Temp
V_sense = 20 mV; V_out = 1 V; V_en = 2.4 V
0.00
20.00
40.00
60.00
80.00
100.00
120.00
8 14274042
Vs (V)
Iout (mA)
-40°C
-25°C
0°C
25°C
45°C
65°C
85°C
105°C
125°C
150°C
Datasheet 10 Rev. 3.1, 2013-02-21
BCR450
LED Driver IC
Measured Parameters
Vs = 14 V, Vout = 1 V; EN = 2.4 V
Iout vers Temperature (VSense)
Iout vers Temp_Vsense_Vs14V_Vout1V.vsd
I_out_ver s Temp; Vsense
V_s = 14 V; V_out = 1 V; V_en = 2.4 V
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
-40 -25 0 25 45 65 85 105 125 150
°C
Iout (mA)
110mV
114mV
118mV
122mV
126mV
130mV
134mV
138mV
140mV
142mV
144mV
146mV
148mV
150mV
152mV
154mV
156mV
Iout vers Vsense (Temperature)
Iout vers Vsense_Temp_Vs14V_Vout1V.vsd
I_out_ver s V_sense ; Temp
V_s = 14 V; V_out = 1 V; V_en = 2.4 V
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
110
114
118
122
126
130
134
138
140
142
144
146
148
150
152
154
156
Vsense (mV)
Iout ( mA)
-40°C
-25°C
0°C
25°C
45°C
65°C
85°C
105°C
125°C
150°C
BCR450
LED Driver IC
Measured Parameters
Datasheet 11 Rev. 3.1, 2013-02-21
Vs = 14 V, Vout = 6 V; EN = 20 mV
Iout vers EN (Temperature)
Iout vers Ven_Vsense20mV_Vs14V_Vout6V.vsd
I_out_vers V_en; Temp
V_sense = 20 mV; V_out = 6 V; V_s = 14 V
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
0 0.2 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 5
Ven (V)
Iout (mA)
-40°C
-25°C
0°C
25°C
45°C
65°C
85°C
105°C
125°C
150°C
Vs = 14 V, Vsense = 20 mV; EN = 2.4 V
Iout vers Temperature (Vout)
Iout vers Temp_Vout_Vsense20mV_Vs14V.vsd
I_out_vers Temperature; V_out
V_sense = 20 mV; V_en = 2.4 V; V_s = 14 V
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
-40-25 0 25456585105125150
°C
Iout (mA
)
Vout=0V
Vout=1V
Vout=2V
Vout=3V
Vout=4V
Vout=5V
Vout=6V
Vout=7V
Vout=8V
Vout=9V
Vout=10V
Vout=11V
Vout=12V
Vout=13V
Vout=14V
Iout vers Vout (Temperature)
Vout = 1 V, Vsense = 20 mV; EN = 2.4 V
Is vers VS (Temperature)
Is vers Vs_Temp_20mV_Vout1V_entire range.vsd
I_s_vers Vs; Temp
V_s ense = 20 mV; V_out = 1 V; V_en = 2.4 V
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
6 7 8 9 10 11 12 13 14 15 16
Vs (V)
Is (mA)
-40°C
-25°C
0°C
25°C
45°C
65°C
85°C
105°C
125°C
150°C
Datasheet 12 Rev. 3.1, 2013-02-21
BCR450
LED Driver IC
Measured Parameters
Vout = 6 V, Vsense = 20 mV; EN = 2.4 V
Is vers VS (Temperature)
Is vers Vs_Temp_20mV_Vout6V.vsd
I_s_vers Vs; Temp
V_s ense = 20 mV; V_out = 6 V; V_en = 2.4 V
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
6 6.87.68.49.210111213141516
Vs (V)
Is (mA)
-40°C
-25°C
0°C
25°C
45°C
65°C
85°C
105°C
125°C
150°C
Is vers VS (Temperature)
Is vers Vs_Temp_20mV_Vout6V_entire range.vsd
I_s_vers Vs; Temp
V_sense = 20 mV; V_out = 6 V; V_en = 2.4 V
0.00
20.00
40.00
60.00
80.00
100.00
120.00
8 1012141618202224262830323436384042
Vs (V)
Is (mA)
-40°C
-25°C
0°C
25°C
45°C
65°C
85°C
105°C
125°C
150°C
Is short -> Vout = 0 V, Vsense = 0 mV; EN = 2.4 V
Is vers VS (Temperature)
Is vers Vs_Temp_0mV_Vout0V.vsd
I_s_vers Vs; Temp
V_sense = 0 mV; V_out = 0 V; V_en = 2.4 V
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
8 12 16 20 24 27 28.5 29.5 30.5 31.5 32.5 33.5 38
Vs (V)
Is (mA)
-40°C
-25°C
0°C
25°C
45°C
65°C
85°C
105°C
125°C
150°C
Is standby -> Vout = 0 V, Vsense = 0 mV; EN = 0 V
Is vers VS (Temperature)
Is vers Vs_Temp_0mV_Vout0V_EN0V.vsd
I_s_vers Vs; Temp
V_sense = 0 mV; V_out = 0 V; V_en = 0 V
0.00
5.00
10.00
15.00
20.00
25.00
30.00
35.00
40.00
45.00
50.00
8 121620242729313335373941
Vs (V)
Is (uA)
-40°C
-25°C
0°C
25°C
45°C
65°C
85°C
105°C
125°C
150°C
BCR450
LED Driver IC
Measured Parameters
Datasheet 13 Rev. 3.1, 2013-02-21
Vout = 6 V, Iout = 15 mA; EN = 2.4 V
Vsense vers VS (Temperature)
Vsense vers Vs_Temp_Iout15mA_Vout6V.vsd
Vsense_vers Vs; Temp
Iout = 15 mA; V_out = 6 V; V_en = 2.4 V
125.00
130.00
135.00
140.00
145.00
150.00
155.00
-40 -25 0 25 45 65 85 105 125 150
°C
Vsense (mV)
Vs =8 V
Vs=14V
Vs=27V
Vs = 12 V, Iout = 350 mA , Booster Application , see Figure 3
Iout vers Tsolder
TSD.vsd
Typical Temperature Shut Down of BCR450
Booster Application
0
50
100
150
200
250
300
350
60 70 80 90 100 110 120 130 140 150 160 170
Tsolderpoint (° C)
Iout (mA)
Datasheet 14 Rev. 3.1, 2013-02-21
BCR450
LED Driver IC
Measured Parameters
EN = 2.4 V
BCR450_Vdrop _Schematic.vsd
Vs
Vout
Vdrop
Internal Transistor
BCR450
Vdrop vers Iout
Vdrop.vsd
typ. Vdrop
0
1
2
3
4
5
6
0 102030405060708090
Iout (mA)
Vdrop (V)
4.2 AC- Parameter
Response Time
Ton & Toff; Vs= 12 V; fPulse= 1 kHz; tduty= 50 %
BCR450_Response-Time.vsd
BCR450
LED Driver IC
Evaluation Board
Datasheet 15 Rev. 3.1, 2013-02-21
5 Evaluation Board
The evaluation board is designed to test the BCR450 as a stand alone device for lower LED current applications
and also with additional external “booster“ transistors for high current, high brightness LEDs. Up to three external
transistors BCX68 or BC817SU each could be used on the PCB to minimize thermal problems.
3 LEDs in series for high current mode or 3 LEDs for low current applications can be chosen by setting resistors
(for further application hints see AN105). The particular sense voltage can be derived by jumpers which are
provided in the layout for each test case. Additional test circuit is included to measure AC characteristics, and the
ENABLE input is designed to connect a PWM signal. The PCB is manufactured in double sided FR4 with substrate
thickness of 1.0 mm.
Vbat
BCR450 LED Controller
LEDs
Rsensehigh
LEDs
NPN
Power
Transistors
Jumper-H
Jumper-L
Rsenselow
BCX68-25
or
BC817SU
AC- Measure
PWM
P2
P1
BCR450_Application circuit.vsd
=Vref
Vs, Pin 6
Vsense, Pin 4
Iout, Pin 1
EN, Pin 3 GND, Pin 2 & 5
+
-
Figure 3 Evaluation board schematic
Cross section of application board.vsd
BOTTOM- Layer CU 70 um
TOP- Layer CU 70 um
FR4 1.0 mm
Via 1.3 mm
0.5 mm Drill
Datasheet 16 Rev. 3.1, 2013-02-21
BCR450
LED Driver IC
Package Information
Figure 4 Cross section of evaluation board
6 Package Information
GPX09300
1.6
±0.1
±0.1
2.5
±0.1
0.25
1.1 MAX.
0.1 MAX.
(2.25)
+0.1
-0.05
0.35
(0.35)
10
˚
MAX.
10
˚
MAX.
2.9
±0.2
B
0.2
M
B6x
0.95
1.9
A
0.2 A
M
0.15
+0.1
-0.06
321
456
Figure 5 Package outline; SC74 (dimensions in mm)
2.7
4
3.15
Pin 1
marking CPWG5899
8
0.2
1.15
Figure 6 Tape loading (dimensions in mm)
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Authorized Distributor
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