®
ACT2102
18V/2A Step-Down DC/DC Converter
GENERAL DESCRIPTION
Rev 2, 23-May-12
FEATURES
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2A Output Current
Wide 4.5V to 18V Operating Input Range
Synchronous Buck Topology
Integrated 130mΩ Power MOSFET Switches
Output Adjustable from 0.923V to 12V
Up to 96% Efficiency
Stable with Low ESR Ceramic Output
Capacitors
Internal Soft Start
1.5mA 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
ACT2102 is a monolithic synchronous buck
regulator. The device integrates two 130mΩ
MOSFETs, and provides 2A 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 1.5mA.
This device, available in an 8-pin SOP 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
100
95
90
Efficiency vs. Load Current
ACT2102-001
V
IN
= 7V
Efficiency (%)
85
80
75
70
65
60
55
10
100
V
IN
= 12V
V
IN
= 18V
V
OUT
= 5V
1000
10000
Load Current (mA)
Innovative Power
TM
-1-
www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
ACTIVE-SEMI [ ACTIVE-SEMI, INC ]
