ACT6305
Low Input High Efficiency
Synchronous Step-Up DC/DC Converter
FEATURES
•
•
•
•
•
•
1V Typical Startup Voltage
Up to 94% Efficiency
Fully Integrated Power Stage
Fixed 3.3V/5V or Adjustable Output Voltage
NanoStandby
TM
Shutdown Mode
Tiny SOT23-5 Package
−
RoHS Compliant Package
Rev0, 13-May-08
GENERAL DESCRIPTION
The ACT6305 is a high efficiency synchronous
step-up DC/DC converter that consumes just 17µA
of quiescent supply current and is capable of deliv-
ering more than 400mA output current using only
three external components. This device achieves a
typical startup voltage of just 1V, making it ideal for
applications operating from 1 or 2 alkaline cells.
This device incorporates an internal synchronous
rectifier, and achieves excellent peak efficiency of
up to 94% and features a proprietary control
scheme that ensures high efficiency over a wide
load current range.
The ACT6305 features pin-selectable output volt-
ages of 3.3V or 5V, or it can also be set externally
to any voltage between 2V and 5V. The ACT6305 is
available in a tiny SOT23-5 package.
APPLICATIONS
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•
•
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Hand-Held Devices
One to Three Cell Battery Operated Devices
PDAs
Cellular Phones
Digital Cameras
GPS
TYPICAL APPLICATION CIRCUIT
Efficiency vs. Output Current
V
IN
L 6.8µH
LX
OUT
V
OUT
100
90
ACT6305-001
Efficiency (%)
ENABLE
ACT6305
EN
G
FB
C2
22µF
80
V
IN
= 5V
70
V
IN
= 3.5V
60
V
IN
= 1.2V
V
IN
= 2.4V
C1
22µF
Pb-free
50
40
30
0.1
1.0
10
100
V
OUT
= 5V
1000
Output Current (mA)
Innovative Power
TM
-1-
www.active-semi.com
Copyright © 2008 Active-Semi, Inc.
ACTIVE-SEMI [ ACTIVE-SEMI, INC ]
