SS6638G
Simple
3-Pin Step-Up DC/DC Converter
FEATURES
Guaranteed
start-up
from less than 0.9 V.
High
efficiency.
Low
quiescent current.
Fewer external components
needed.
Low
ripple
and
low
noise.
Fixed
output voltage:
2.7V, 3.0V, 3.3V, 4.5V
and 5V.
Space
saving packages:
SOT-23, SOT-89
and TO-92.
DESCRIPTION
The
SS6638G
is a high-efficiency step-up DC/DC
converter for applications using 1 to 4 NiMH
battery cells. Only three external components are
required to deliver a fixed output voltage of 2.7V,
3.0V, 3.3V, 4.5V or 5V. The
SS6638G
starts up
from less than 0.9V input with 1mA load.
A
Pulse
Frequency Modulation scheme brings optimized
performance for applications with light output
loading and low input voltages. The output ripple
and noise are lower compared with circuits
operating in PSM mode.
The PFM control circuit operating
at a maximum
100kHz
switching rate results in smaller passive
components. The space saving SOT-23, SOT-89
and TO-92 packages make the
SS6638G
an ideal
choice of DC/DC converter for space-conscious
applications, like pagers, electronic cameras, and
wireless microphones.
Pb-free, RoHS compliant.
APPLICATIONS
Pagers.
Cameras.
Wireless Microphones.
Pocket Organizers.
Battery Backup Supplies.
Portable Instruments.
TYPICAL APPLICATION CIRCUIT
V
IN
L1
100µH
D1
SS12
SS6638-27G
SS6638-30G
SS6638-33G
SS6638-45G
SS6638-50G
GND
V
OUT
+
C1
SW
22µF
VOUT
+ C2
47µF
Simple
Step-Up DC/DC Converter
8/21/2005 Rev.2.3
www.SiliconStandard.com
1 of 19
SSC [ SILICON STANDARD CORP. ]
