MP2490
1.5A, 36V, 700KHz Step-Down Converter
with Programmable Output Current Limit
The Future of Analog IC Technology
DESCRIPTION FEATURES
Wide 4.5V to 36V Operating Input Range
The MP2490 is a monolithic step-down switch
Programmable up to 1.5A Output Current
mode converter with a programmable output
current limit. It achieves 1.5A continuous output Output Adjustable from 0.8V to 15V
current over a wide input supply range with Programmable Output Current Limit without
excellent load and line regulation. power loss
0.25 Internal Power MOSFET Switch
The maximum output current can be
Stable with Low ESR Output Ceramic
programmed by sensing current through the
Capacitors
inductor DC resistance (DCR) or an accurate
95% Efficiency @ 500mA (Vo=5V)
sense resistor.
Fixed 700kHz Frequency
Fault condition protection includes cycle-by-cycle
Thermal Shutdown
current limiting and thermal shutdown.
Cycle-by-Cycle Over Current Protection
The MP2490 requires a minimum number of Available in QFN10 (3mm x 3mm), 8-Pin
readily available standard external components. SOIC and PDIP Packages
The MP2490 is available in QFN10 (3mm x 3mm),
APPLICATIONS
8-pin SOIC and PDIP packages.
USB Power Supplies
Automotive Cigarette Lighter Adapters
Power Supply for Linear Chargers
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
Efficiency vs.
Load Current
89 100
PGOOD BST V =8V
IN
1 6
VIN
VIN ISN
90
4.5V - 36V
7
PGOOD
ISP
R8
V-PULL-UP
V =12V
C9
IN
C6
80
10nF
MP2490 10nF
R5
3
EN EN
L1 5V VOUT
10
SW 70
D1
4
5
V =24V
FB 60
SS IN
GND
2 GND V =5V
OUT
50
10 100 1000 10000
LOAD CURRENT (mA)
MP2490 Rev. 1.0 www.MonolithicPower.com 1
4/9/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
2014 MPS. All Rights Reserved.
EFFICIENCY (%)MP2490 1.5A, 36V, 700kHz STEP-DOWN WITH PROGRAMMABLE OUTPUT CURRENT LIMIT
ORDERING INFORMATION
Part Number Package Top Marking Free Air Temperature (T )
A
MP2490DQ * QFN10 (3mm X 3mm) T6 40 C to +85C
MP2490DS SOIC8 MP2490DS
40 C to +85C
MP2490CP PDIP8 MP2490CP 0 C to +70 C
* For Tape & Reel, add suffix Z (e.g. MP2490DQZ);
For RoHS, compliant packaging, add suffix LF (e.g. MP2490DQLFZ).
PACKAGE REFERENCE
TOP VIEW
VIN 1 10 SW
TOP VIEW
GND 2 9 BST
VIN 1 8 SW
EN 3 8 PGOOD
GND 2 7 BST
FB 4 7 ISP
FB 3 6 ISP
SS 5 6 ISN
SS 4 5 ISN
EXPOSED PAD
ON BACKSIDE
CONNECT TO GND
QFN10 (3mm X 3mm) SOIC/PDIP
(1) (4)
ABSOLUTE MAXIMUM RATINGS Thermal Resistance
JA JC
QFN10 (3mm x 3mm) .............50 ...... 12... C/W
Supply Voltage V ....................................... 40V
IN
SOIC8 .....................................90 ...... 45... C/W
V ....................................... 0.3V to V + 0.3V
SW IN
PDIP8......................................95 ...... 55... C/W
V ................................................... V + 6.5V
BST SW
V v ................................................0V to15V
ISN, ISP
Notes:
All Other Pins..............................0.3V to +6.5V
1) Exceeding these ratings may damage the device.
(2)
2) The maximum allowable power dissipation is a function of the
Continuous Power Dissipation (T = +25C)
A
maximum junction temperature T (MAX), the junction-to-
J
QFN10 (3mm x 3mm) ................................ 2.5W
ambient thermal resistance , and the ambient temperature
JA
SOIC8 ...................................................... 1.39W T . The maximum allowable continuous power dissipation at
A
any ambient temperature is calculated by P (MAX) = (T
D J
PDIP8 ...................................................... 1.32W
(MAX)-T )/ . Exceeding the maximum allowable power
A JA
Junction Temperature...............................150C
dissipation will cause excessive die temperature, and the
regulator will go into thermal shutdown. Internal thermal
Lead Temperature ....................................260C
shutdown circuitry protects the device from permanent
Storage Temperature.............. 65 C to +150 C
damage.
3) The device is not guaranteed to function outside of its
(3)
operating conditions.
Recommended Operating Conditions
4) Measured on JEDEC51-7 4 layer PCB.
Supply Voltage V ...........................4.5V to 36V
IN
Output Voltage V (V >16.5V) ....... 0.8V to 15
OUT IN
Output Voltage V (V <=16.5V)......................
OUT IN
.........................................0.8V to (V 1.5)V
IN
Operating Junction Temperature (T )
J
................................................ 40C to +125 C
MP2490 Rev. 1.0 www.MonolithicPower.com 2
4/9/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
2014 MPS. All Rights Reserved.