SS6638G Datasheet, PDF (1/19 Pages) Silicon Standard Corp. – Simple 3-Pin Step-Up DC/DC Converter

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.
Pb-free, RoHS compliant.
APPLICATIONS
Pagers.
Cameras.
Wireless Microphones.
Pocket Organizers.
Battery Backup Supplies.
Portable Instruments.
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.
TYPICAL APPLICATION CIRCUIT
V_IN
V_OUT
L1
100µH
+
C1
22µF
SW
D1
SS12
SS6638-27G
SS6638-30G
SS6638-33G
SS6638-45G
SS6638-50G
VOUT
GND
+ _C2
47µF
Simple Step-Up DC/DC Converter
8/21/2005 Rev.2.3
www.SiliconStandard.com
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