MP2489
Step Down White LED Driver with
Wide 6V
–
60V Input Voltage
The Future of Analog IC Technology
DESCRIPTION
The MP2489 is a high efficiency step-down
converter designed in continuous current mode
for driving the high brightness Light Emitting
Diodes (LED) from wide input voltage 6V–60V.
The MP2489 employs hysteretic control
architecture to regulate a high accuracy LED
current, which is measured through an external
high-side current sensing resistor. Moreover,
this control scheme provides optimized circuit
stabilization and very quick response time
without the loop compensation. Its low 202mV
average feedback voltage reduces power loss
and improves the converter efficiency.
The MP2489 implements PWM and analog
dimming together with DIM pin.
The MP2489 includes thermal overload
protection preventing damage in the event of an
output overload.
The MP2489 is available in small QFN6 (3x
3mm), TSOT23-5 and SOIC8E packages.
FEATURES
•
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•
•
•
•
•
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Internal 65V MOSFET
Wide 6V to 60V Input Range
1A Output Current
High Efficiency (>95%)
Hysteresis Control
PWM & Analog Dimming
1000:1 PWM Dimming Resolution
Thermal Shutdown
Inherent Open LED Protection
Short LED Protection
Available in TSOT23-5, QFN6(3x 3mm) and
SOIC8E Packages
Low Voltage Halogen Replacement
Low Voltage General Illumination
Automotive/Decorative LED Lighting
Signs/Emergency Lighting
LED Backlighting
APPLICATIONS
•
•
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All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Quality Assurance. “MPS” and “The
Future of Analog IC Technology” are Registered Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
V
IN
C
IN
D1
R
SENSE
IN
RS
MP2489
EN/DIM
GND
SW
L1
MP2489 Rev. 1.22
9/4/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
1
MP2489 – STEP DOWN WLED DRIVER WITH WIDE 6V–60V INPUT VOLTAGE
ORDERING INFORMATION
Part Number
MP2489DJ*
MP2489DQ
MP2489DN
Package
TSOT23-5
QFN6 (3x 3mm)
SOIC8E
Top Marking
AAD
9Y
MP2489
*
For Tape & Reel, add suffix –Z (e.g. MP2489DJ–Z);
For RoHS Compliant Packaging, add suffix –LF (e.g. MP2489DJ–LF–Z)
PACKAGE REFERENCE
TOP VIEW
SW
GND
GND
EN/DIM
1
2
3
4
8
7
6
5
IN
GND
GND
RS
EXPOSED PAD
ON BACKSIDE
CONNECT TO GND
TSOT23-5
QFN6 (3x 3mm)
(4)
SOIC8E
ABSOLUTE MAXIMUM RATINGS
(1)
V
IN
, V
SW
.........................................-0.3V to +65V
V
RS
..................................................V
IN
-5V to V
IN
All Other Pins ...............................-0.3V to +6.3V
Continuous Power Dissipation
(T
A
= +25°C)
(2)
TSOT23-5 .................................................. 1.3W
QFN6 ......................................................... 2.5W
SOIC8E...................................................... 2.6W
Junction Temperature ...............................150°C
Lead Temperature ....................................260°C
Storage Temperature............... -65°C to +150°C
Thermal Resistance
θ
JA
θ
JC
TSOT23-5 .............................100 ..... 55 ...
°C/W
QFN6 (3mm x 3mm) ..............50 ...... 14 ...
°C/W
SOIC8E ..................................48 ...... 10 ...
°C/W
Notes:
1) Exceeding these ratings may damage the device.
2) The maximum allowable power dissipation is a function of the
maximum junction temperature T
J
(MAX), the junction-to-
ambient thermal resistance
θ
JA
, and the ambient temperature
T
A
. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by P
D
(MAX)=(T
J
(MAX)-
T
A
)/
θ
JA
. Exceeding the maximum allowable power dissipation
will cause excessive die temperature, and the regulator will go
into thermal shutdown. Internal thermal shutdown circuitry
protects the device from permanent damage.
3) The device is not guaranteed to function outside of its
operation conditions.
4) Measured on JESD51-7, 4-layer PCB.
Recommended Operating Conditions
(3)
Supply Voltage V
IN
..............................6V to 60V
Operating Junction Temp. (T
J
). -40°C to +125°C
MP2489 Rev. 1.22
9/4/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
2
MP2489 – STEP DOWN WLED DRIVER WITH WIDE 6V–60V INPUT VOLTAGE
ELECTRICAL CHARACTERISTICS
V
IN
= 24V, T
A
= +25°C, unless otherwise noted.
Parameter
Input Voltage
Shutdown Supply Current
Quiescent Supply Current
Internal Reference Voltage
Feedback Reference Voltage
(with respect to V
IN
)
Symbol Condition
V
IN
I
SD
I
Q
No Switching
I
REF
V
IN
-V
RS
V
EN/DIM
= 1.28V
Min
6
Typ
Max
60
108
1
Units
V
µA
mA
V
mV
mV
2.56
0.3
20
0.1
0.5
100
100
600
30
0.3
70
0.25
50
45
0.3
80
2
V
V
V
mV
kΩ
kHz
Ω
ns
ns
kHz
%
ms
1.275
192
202
±30
212
Feedback Reference Voltage
V
FB_HYS
Hysterisis
EN/DIM Max Dimming Voltage
V
DIM_MAX
EN/DIM Mim Dimming Voltage
V
DIM_MIN
EN/DIM Enable High Voltage
V
EN_HIGH
V
EN
Rising
EN/DIM Enable Hysterisis
V
EN_HYS
EN/DIM Up-pulling Resistor
R
EN
Recommended PWM Dimming
F
PWM
Frequency
Switch On Resistance
R
DS_ON
Minimum On Time
T
ON_MIN
Minimum Off Time
T
OFF_MIN
Recommended
Maximum
F
MAX
Operating Frequency
Recommended Duty Cycle Range
D
at F
MAX
External capacitor on dim
Start Up Time
T
SS
pin is 4.7nF
MP2489 Rev. 1.22
9/4/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
3
MP2489 – STEP DOWN WLED DRIVER WITH WIDE 6V–60V INPUT VOLTAGE
PIN FUNCTIONS
TSOT23-5
Pin#
1
2
QFN6
Pin#
1
2, 5
SOIC8
Pin#
1
Name Description
SW
The Drain of Internal MOSFET. Connecting the common terminal of
inductor and anode of Schottky to this pin.
2,3,6,7 GND Ground.
Enable/Dimming Command Input. To use PWM dimming, apply a square
wave signal to this pin. To use Analog dimming, apply a 0.3V–2.5V DC
voltage to this pin. The voltage from 0.3V to 2.5V linearly controls the
4
EN/DIM
LED current range from 25% to 200%. Turn off the output current when
pulling this pin below 0.2V. Connect a 1nF–10nF capacitor for normal
operation (V
EN/DIM
=1.28V).
LED Current Sense Input. Connecting the current sensing resistor that
5
RS
programs the LED average current to IN pin.
Input Supply Pin. Connecting a proper decoupling capacitor from IN pin
8
IN
to GND.
3
3
4
5
4
6
MP2489 Rev. 1.22
9/4/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
4
MP2489 – STEP DOWN WLED DRIVER WITH WIDE 6V–60V INPUT VOLTAGE
TYPICAL PERFORMANCE CHARACTERISTICS
V
IN
=30V, 3 LED
S
in series, I
OUT
=550mA, unless otherwise noted.
100
95
EFFICIENCY (%)
Efficiency vs.
Input Voltage
1.2
OUTPUT CURRENT (A)
Analog Dimming Curve
1.2
1
0.8
ILED(A)
ILED vs. Rset
1
0.8
0.6
0.4
0.2
00
0.5
1
1.5
2
2.5
3
90
85
80
75
70
10
20
30
40
50
60
0.6
0.4
0.2
0
0.1
0.3
0.5
0.7
0.9
1.1
INPUT VOLTAGE (V)
ANALOG DIM (V)
Steady State
Vin Startup
Ven Startup
V
SW
10V/div.
V
sw
20V/div.
V
IN
20V/div.
I
LED
500mA/div.
V
SW
20V/div.
V
EN
1V/div.
EN Signal
2V/div.
I
LED
500mA/div.
I
LED
200mA/div.
PWM Dimming
f
PWM
= 200Hz, D
PWM
= 50%
Open LED Protection
Open LEDs at working
Short LED Protection
Short LEDs at working
V
SW
20V/div.
PWM Signal
2V/div.
I
LED
500mA/div.
V
SW
20V/div.
V
SW
20V/div.
V
LED+
10V/div.
I
LED
200mA/div.
V
LED-
10V/div.
I
LED
200mA/div.
MP2489 Rev. 1.22
9/4/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
5
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