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MP2481DH-LF-Z

P1-P3P4-P6P7-P9P10-P12
MP2481
36V, 1.2A, 1.4MHz
White LED Driver
MP2481 Rev. 1.43 www.MonolithicPower.com 1
7/10/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
The Future of Analog IC Technology
DESCRIPTION
The MP2481 is a 36V, 1.2A, white LED driver
suitable for either step-down or inverting
step-up/down applications. It achieves 1.2A
peak output current over a wide input supply
range with excellent load and line regulation.
Current mode operation provides fast transient
response and eases loop stabilization. Fault
condition protection includes thermal shutdown,
cycle-by-cycle peak current limiting, input over
voltage protection, open strings protection and
output short circuit protection.
The MP2481 incorporates both DC and PWM
dimming onto a single control pin. The separate
input reference ground pin allows for direct
enable and/or dimming control for a positive to
negative power conversion.
The MP2481 requires a minimum number of
readily available standard external components
and is available in 8-pin MSOP8E package.
EVALUATION BOARD REFERENCE
Board Number Mode
EV2481-H-00A Step-down
EV2481-H-01A Step-up/down
FEATURES
1.2A Maximum Output Current
Unique Step-up/down Operation (Buck-
Boost Mode)
Wide 4.5V to 36V Operating Input Range for
Step-Down Applications (Buck Mode)
0.30 Internal Power MOSFET Switch
Fixed 1.4MHz Frequency
Analog and PWM Dimming
0.2V Reference Voltage
Up to 95% Efficiency
5A Shutdown Mode
No minimum LED required
Stable with Low ESR Output Ceramic
Capacitors
Cycle-by-Cycle Over Current Protection
Thermal Shutdown Protection
Open Strings Protection
Input Over Voltage Protection
Output Short Circuit Protection
Available in 8-Pin MSOP8E Package
APPLICATIONS
General LED Illuminations
LCD Backlight Panels
Handheld Computers
Automotive Internal Lighting
Portable Multimedia Players
Portable GPS Devices
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 “Th
e
Future of Analog IC Technology” are Trademarks of Monolithic Powe
r
Systems, Inc.
TYPICAL APPLICATION (STEP-UP/DOWN APPLICATION)
MP2481
SW
FB
BST
VSS
VDD OVP
EN/DIM
INGND
Cbs
1
5
6
2
4
8
7
3
D1
3 series, 9 paralleled
C1
VIN
4.5V-36V
L1
C2
R1
R2
Rs
OFF
DC or PWM INPUT
ON
Efficiency vs.
Input
Step-up/down
Application
Voltage
60
65
0 5 10 15 20 25 30
70
75
80
85
90
EFFICIENCY (%)
INPUT VOLTAGE (V)
4 series,400mA
3 series,400mA
3 series,9 paralleded,180mA total
MP2481 –36V, 1.2A, 1.4MHz WHITE LED DRIVER
MP2481 Rev. 1.43 www.MonolithicPower.com 2
7/10/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
ORDERING INFORMATION
Part Number* Package Top Marking
MP2481DH
MSOP8E
2481D
* For Tape & Reel, add suffix –Z (e.g. MP2481DH–Z).
For RoHS compliant packaging, add suffix –LF (e.g. MP2481DH–LF–Z)
PACKAGE REFERENCE
VDD
VSS
OVP
FB
EXPOSED PAD
ON BACK SIDE
*
* Do not Connect to Input Ground (INGND)
for Boost, Buck-Boost applications
1
2
3
4
8
7
6
5
SW
BST
INGND
EN/DIM
TOP VIEW
ABSOLUTE MAXIMUM RATINGS
(1)
Supply Voltage V
DD
– V
SS
............................. 40V
V
SW
– V
SS
............................. –0.3V to V
IN
+ 0.3V
V
BST
...................................................... V
SW
+ 6V
V
OVP
– V
SS
......................................–0.3V to +6V
V
EN
– V
INGND
....................................–0.3V to +6V
V
DIM
– V
INGND
...................................–0.3V to +6V
V
INGND
– V
SS
....................................–0.3V to 40V
Continuous Power Dissipation (T
A
= +25°C)
(2)
………………………………………………....2.3W
Junction Temperature...............................150C
Lead Temperature ....................................260C
Storage Temperature.............. –65C to +150C
Recommended Operating Conditions
(3)
Supply Voltage V
DD
– V
SS
.................4.5V to 36V
Operating Junct. Temp (T
J
)..... –40C to +125C
Thermal Resistance
(4)
θ
JA
θ
JC
MSOP8E (Exposed Pad) ........55 ...... 12 ... 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
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
)/
JA
. Exceeding the maximum allowable powe
r
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
operating conditions.
4) Measured on JESD51-7, 4-layer PCB.
MP2481 –36V, 1.2A, 1.4MHz WHITE LED DRIVER
MP2481 Rev. 1.43 www.MonolithicPower.com 3
7/10/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
ELECTRICAL CHARACTERISTICS
V
IN
= 12V, T
A
= +25C, all voltages with respect to V
SS
, unless otherwise noted.
Parameters Symbol Condition Min Typ Max Units
Feedback Voltage V
FB
4.5V V
IN
36V
0.187 0.203 0.219 V
Feedback Current I
FB
V
FB
= 0.2V 0.2 A
Switch-On Resistance
(5)
R
DS(ON)
0.30
Switch Leakage V
EN
= 0V, V
SW
= 0V 10 A
Switch Current Limit
(5)
2.0 A
Oscillator Frequency f
SW
V
FB
= 0.1V 1.0 1.4 1.8 MHz
Fold-back Frequency V
OVP
< 0.4V 120 kHz
Maximum Duty Cycle V
FB
= 0.1V 89 %
Minimum On-Time
(5)
t
ON
100 ns
Under Voltage Lockout Threshold Rising 3.1 3.4 3.7 V
Under Voltage Lockout Threshold
Hysteresis
480 mV
V
EN
= 2V 2.0
EN Input Current
V
EN
= 0V 0.1
A
EN OFF Threshold (w/Respect to INGND) V
EN
Falling 0.4 V
EN ON Threshold (w/Respect to INGND) V
EN
Rising 0.7 V
Supply Current (Quiescent) I
Q
V
EN
= 2V, V
FB
= 1V 0.6 1.1 mA
Thermal Shutdown
(5)
150 °C
Open LED OV Threshold V
OVP, th
1.23 V
Open LED OV Hysteresis V
OVP, hys
0.1 V
Note:
5) Guaranteed by design.
P1-P3P4-P6P7-P9P10-P12

MP2481DH-LF-Z

Mfr. #:
Buy MP2481DH-LF-Z
Manufacturer:
Monolithic Power Systems (MPS)
Description:
LED Lighting Drivers 1.2A 36V 1.4MHz Buck Boost WLED Drvr
Lifecycle:
New from this manufacturer.
Delivery:
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