MP2358
2A, 23V, 370KHz
Step-Down Converter
MP2358 Rev. 1.3 www.MonolithicPower.com 1
3/23/2006 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
The Future of Analog IC Technology
TM
TM
DESCRIPTION
The MP2358 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. Programmable soft-start
minimizes the inrush supply current and the
output overshoot at initial startup.
The MP2358 requires a minimum number of
readily available standard external components.
EVALUATION BOARD REFERENCE
Board Number Dimensions
EV2358DS-00A 2.3” x 1.4” x 0.5”
EV2358DQ-00A 2.0” x 1.3” x 0.4”
FEATURES
• 2A Output Current with QFN Package
• 0.18Ω Internal Power MOSFET Switch
• Stable with Low ESR Output Ceramic
Capacitors
• 93% Efficiency
• 23µA Shutdown Mode
• Fixed 370KHz Frequency
• Thermal Shutdown
• Cycle-by-Cycle Over Current Protection
• Wide 4.75V to 23V Operating Input Range
• Output Adjustable from 0.92V to 16V
• Programmable Under Voltage Lockout
• Available in QFN10 (3mm x 3mm) and SO8
Packages
APPLICATIONS
• Distributed Power Systems
• Battery Charger
• Pre-Regulator for Linear Regulators
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
MP2358
SW
IN BS
FB
SS
COMPGND
EN
V
OUT
3.3V/2A
INPUT
4.75V - 23V
MP2358_TAC_S01
OPEN = AUTOMATIC
STARTUP
C5
10nF
C3
3.9nF
C4
10nF
D1
B220A
C6
OPEN
EFFICIENCY (%)
95
90
85
80
75
70
65
60
OUTPUT CURRENT (A)
MP2358_EC01
Efficiency vs
Output Current
0 1.00.5 1.5 2.0 2.5
5.0V
3.3V
2.5V
