MP1580 Datasheet, PDF (1/10 Pages) Monolithic Power Systems – 2A, 380 KHz Step-Down Converter

TM
The Future of Analog IC Technology ^TM
DESCRIPTION
The MP1580 is a monolithic step-down switch
mode converter with a built in internal power
MOSFET. It achieves 2A continuous 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 cycle-by-cycle
current limiting and thermal shutdown. In
shutdown mode the regulator draws 23µA of
supply current.
The MP1580 requires a minimum number of
readily available standard external components. A
synchronization pin allows the part to be driven to
600KHz.
EVALUATION BOARD REFERENCE
Board Number
EV0007
Dimensions
2.3”X x 1.5”Y x 0.5”Z
MP1580
2A, 380 KHz
Step-Down Converter
FEATURES
• 2A Output Current
• 0.18Ω Internal Power MOSFET Switch
• Stable with Low ESR Output Ceramic
Capacitors
• Up to 95% Efficiency
• 23µA Shutdown Mode
• Fixed 380KHz Frequency
• Thermal Shutdown
• Cycle-by-Cycle Over Current Protection
• Wide 4.75 to 25V Operating Input Range
• Output Adjustable from 1.22V to 21V
• Programmable Under Voltage Lockout
• Frequency Synchronization Input
• Available in an 8-Pin SO Package
APPLICATIONS
• Distributed Power Systems
• Battery Chargers
• Pre-Regulator for Linear Regulators
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
INPUT
4.75V to 25V
OFF ON
OPEN
NOT USED
C5
10nF
2
1
7
IN
EN
BS
3
SW
MP1580
D1
8
5
SYNC
FB
GND
COMP
4
C6
OPEN
6
C3
2.2nF
OUTPUT
2.5V / 2A
MP1580_TAC_S01
Efficiency vs
Output Current Voltage
95
V_OUT = 5.0V
90
V_OUT = 3.3V
85
V_OUT = 2.5V
80
75
70
0
V_IN = 10V
0.5
1
1.5
2
OUTPUT CURRENT (A)
MP1580_TAC_EC01
MP1580 Rev. 3.0
www.MonolithicPower.com
1
12/5/2005
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