®
ACT2103
Rev 2, 23-May-12
18V/3A Step-Down DC/DC Converter
FEATURES
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3A Output Current
Wide 4.5V to 18V Operating Input Range
Synchronous Buck Topology
Integrated 85mΩ Power MOSFET Switches
Output Adjustable from 0.923V to 12V
Up to 96% Efficiency
Stable with Low ESR Ceramic Output
Capacitors
Internal Soft Start
3mA Low Standby Input Current
High Light Load Efficiency
Cycle-by-Cycle Over Current Limit
Input Under Voltage Lockout
Hiccup Protection at Short Circuit and Over
Current
Frequency Fold Back Protection
Low Power Dissipation at Over Current and
Short Circuit
GENERAL DESCRIPTION
ACT2103 is a monolithic synchronous buck
regulator. The device integrates two 85mΩ
MOSFETs, and provides 3A of continuous load
current over a wide input voltage of 4.5V to 18V.
Current mode control provides fast transient
response and cycle-by-cycle current limit. Hiccup at
short circuit reduces IC temperatures.
An internal soft-start prevents inrush current at turn-
on, and in shutdown mode the supply current drops
to 10μA. Pulse-skipping mode at light load reduces
standby power down to 3mA.
This device, available in an 8-pin SOP-8EP
package, provides a very compact solution with
minimal external components.
APPLICATIONS
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LCD-TV
Set-top Box
Distributed Power Systems
Networking Systems
Efficiency vs. Load Current
100
95
90
V
IN
= 7V
ACT2103-001
Efficiency (%)
85
80
75
70
65
60
55
10
100
1000
V
OUT
= 5V
10000
V
IN
= 12V
V
IN
= 18V
Load Current (mA)
Innovative Power
TM
-1-
www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
ACTIVE-SEMI [ ACTIVE-SEMI, INC ]
