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MP24894GJ-P

P1-P3P4-P6P7-P9P10-P12
MP24894
Step-Down WLED-Current Controller
with Wide 6V to 60V Input Voltage
MP24894 Rev 1.01 www.MonolithicPower.com 1
12/20/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
The Future of Analog IC Technology
DESCRIPTION
The MP24894 is a high-efficiency step-down
controller. It is designed to operate in
continuous current mode (CCM) to power LEDs
of high-brightness with a wide input voltage
range of 6V to 60V.
The MP24894 employs a hysteretic control
architecture that accurately regulates LED
current with a feedback coming from an external
high-side current-sense resistor. This control
scheme optimizes circuit stabilization and fast
response time without loop compensation. Its
low 200mV average feedback voltage reduces
power loss and improves the converter’s
efficiency.
The MP24894 implements PWM and analog
dimming together through the EN/DIM pin.
The MP24894 includes thermal overload
protection in case of output overload.
The MP24894 is available in TSOT6 package.
FEATURES
• Wide 6V to 60V Input Range
• Able to Drive >1A LED Load
• Hysteresis Control
• High Efficiency (>95%)
• 2500:1 PWM Dimming Ratio
• Open LED Protection
• Short LED Protection
• Thermal Shutdown
APPLICATIONS
• Low Voltage Halogen Replacement
• Low Voltage General Illumination
• Automotive/Decorative LED Lighting
• Signs/Emergency Lighting
• LED Backlighting
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 Monolithi
c
Power Systems, Inc.
TYPICAL APPLICATION
6V-60V
V
IN
C
IN
R
SENSE
MP24894
IN
RS
DR
GND
VCC
EN/DIM
D1
L1
MP24894 – STEP-DOWN LED-CURRENT CONTROLLER WITH WIDE 6V TO 60V INPUT VOLTAGE
MP24894 Rev 1.01 www.MonolithicPower.com 2
12/20/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
ORDERING INFORMATION
Part Number* Package Top Marking
MP24894GJ
TSOT6
ACG
* For Tape & Reel, add suffix –Z (e.g. MP24894GJ–Z);
PACKAGE REFERENCE
2
1
34
5
6IN
RS
EN/DIM GND
DR
VCC
TSOT6
ABSOLUTE MAXIMUM RATINGS
(1)
V
IN
.................................................-0.3V to +65V
V
RS
..............................................(V
IN
- 5V) to V
IN
All Other Pins...............................-0.3V to +6.5V
Continuous Power Dissipation (T
A
= 25°C)
(2)
TSOT6 ..................................................... 1.25W
Junction Temperature...............................150°C
Lead Temperature ....................................260°C
Storage Temperature............... -65°C to +150°C
Recommended Operating Conditions
(3)
Supply Voltage V
IN
..............................6V to 60V
Operating Junction Temp. (T
J
). -40°C to +125°C
Thermal Resistance
(4)
θ
JA
θ
JC
TSOT6 ..................................100 ..... 55 ... °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 powe
r
dissipation at any ambient temperature is calculated by
P
D
(MAX)=(T
J
(MAX)-T
A
)/
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.
MP24894 – STEP-DOWN LED-CURRENT CONTROLLER WITH WIDE 6V TO 60V INPUT VOLTAGE
MP24894 Rev 1.01 www.MonolithicPower.com 3
12/20/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
ELECTRICAL CHARACTERISTICS
V
IN
= 24V, T
A
= 25°C, unless otherwise noted.
Parameter Symbol Condition Min Typ Max Units
Input voltage V
IN
6 60 V
Shutdown supply current I
SD
80 108 µA
Quiescent supply current I
Q
No Switching 0.3 0.5 mA
VCC voltage Vcc V
EN/DIM
= 3.5V 5.5 6 V
Feedback average voltage
(with respect to V
IN
)
V
IN
-V
RS
V
EN/DIM
= 3.5V 194 200 206 mV
Feedback reference voltage
hysterisis
V
FB_HYS
±30 mV
EN/DIM enable high voltage V
EN_HIGH
V
EN
Rising 0.29 0.34 V
EN/DIM enable hysterisis V
EN_HYS
20 50 80 mV
EN/DIM pull-up current Pull up to 5V 2.8 A
EN/DIM pull-down current
Pull down to GND 25 A
Min recommended pwm dimming
frequency
F
PWMmin
0.1 kHz
Max recommended pwm dimming
frequency
F
PWMmax
20 kHz
Gate driver source resistor R_
source
V
GS
= 5.5V 6
Gate driver sink resistor R_
sink
2
Gate driver output-voltage high V
OH
I
DRV
= 10mA 5.5 V
Gate driver output-voltage low V
OL
I
DRV
= 10mA 0.5 V
Minimum on time T
ON_MIN
Guarantee by Designer 100 ns
Minimum off time T
OFF_MIN
Guarantee by Designer 100 ns
Recommended maximum
operating frequency
F
MAX
1 MHz
UVLO threshold voltage(VCC) V
UVLOTH
VCC Rising 5.6 V
UVLO hysteresis V
UVLOHYS
0.4 V
Thermal shutdown threshold Temp Rising 150 °C
Thermal shutdown hysteresis Guarantee by Designer 20 °C
P1-P3P4-P6P7-P9P10-P12

MP24894GJ-P

Mfr. #:
Buy MP24894GJ-P
Manufacturer:
Monolithic Power Systems (MPS)
Description:
LED Lighting Drivers Step-Dwn White LED Drvr
Lifecycle:
New from this manufacturer.
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