MP2490 Datasheet, PDF (1/13 Pages) Monolithic Power Systems – 1.5A, 36V, 700KHz Step-Down Converter with Programmable Output Current Limit

The Future of Analog IC Technology
MP2490
1.5A, 36V, 700KHz Step-Down Converter
with Programmable Output Current Limit
DESCRIPTION
The MP2490 is a monolithic step-down switch
mode converter with a programmable output
current limit. It achieves 1.5A continuous output
current over a wide input supply range with
excellent load and line regulation.
The maximum output current can be
programmed by sensing current through the
inductor DC resistance (DCR) or an accurate
sense resistor.
Fault condition protection includes cycle-by-cycle
current limiting and thermal shutdown.
The MP2490 requires a minimum number of
readily available standard external components.
The MP2490 is available in QFN10 (3mm x 3mm),
8-pin SOIC and PDIP packages.
FEATURES
• Wide 4.5V to 36V Operating Input Range
• Programmable up to 1.5A Output Current
• Output Adjustable from 0.8V to 15V
• Programmable Output Current Limit without
power loss
• 0.25Ω Internal Power MOSFET Switch
• Stable with Low ESR Output Ceramic
Capacitors
• 95% Efficiency @ 500mA (Vo=5V)
• Fixed 700KHz Frequency
• Thermal Shutdown
• Cycle-by-Cycle Over Current Protection
• Available in QFN10 (3mm x 3mm), 8-Pin
SOIC and PDIP Packages
APPLICATIONS
• USB Power Supplies
• Automotive Cigarette Lighter Adapters
• Power Supply for Linear Chargers
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
VIN
4.5V - 36V
EN
8
9
PGOOD BST
1 _VIN
ISN ⁶
ISP ⁷
C9
MP2490 10nF
R5
3 _EN
10
L1
SW
D1
5 _SS
GND
2
FB ⁴
PGOOD
R8
V-PULL-UP
5V
VOUT
GND
Efficiency vs.
Load Current
100
V_IN=8V
90
80
V_IN=12V
70
60
50
10
V_IN=24V
V_OUT=5V
100
1000
LOAD CURRENT (mA)
10000
MP2490 Rev. 0.92
www.MonolithicPower.com
1
4/23/2010
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