Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB3361
1.4MHz 800mA
High Efficiency Synchronous Step-Down
Regulator in SOT23-5
FEATURES
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DESCRIPTION
The KB3361 SwitchReg is a member of
Kingbor(KB) product family. It is a 1.4MHz step-
down converter with an input voltage range of 2.5V
to 6.5V and output as low as 0.6V. Its low supply
current, small size, and high switching frequency
make the KB3361 the ideal choice for portable
applications.
The KB3361 is available in either a programmable
version with external feedback resistors. It can
deliver up to 800mA of load current while maintai-
27µA no load quiescent current. The 1.4MHz
ning a low 75
The 1.4MHz switching frequency minimizes the size
of external components while keeping switching
losses low.The KB3361 feedback and control
delivers excel lent load regulation and transient
response with a small output inductor and capacitor.
The KB3361 is designed to maintain high efficien-
cy throughout the operating range and provides
fast turn-on time.
The KB3361 is available in a low profile
(1.3mm) SOT23-5 package and is rated over the
-40°C to +85°C temperature range.
High Efficiency: Up to 97%
75
µ
A No Load Quiescent Current
800mA Output Current
2.5V to 6.5V Input Voltage Range
1.4MHz Switching Frequency
No Schottky Diode Required
Low Dropout Operation: 100% Duty Cycle
0.6V Reference Allows Low Output Voltages
Shutdown Mode Draws
1µA
Supply Current
Current Mode Operation for Excellent Line and
Load Transient Response
Overtemperature Protected
Low Profile (1.3mm) SOT23-5 Package
APPLICATIONS
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Cellular Telephones
Personal Information Appliances
Wireless and DSL Modems
Digital Still Cameras
MP3 Players
Portable Instruments
TYPICAL APPLICATION
100
22pF
KB3361
1
RUN
GND
2
V
FB
5
450k
100k
EFFICIENCY (%)
V
IN
3.6V
to 6.5V
4
+
C
IN
10
µF
V
IN
SW
3
4.7µH
V
OUT
3.3V
800mA
C
OUT
10µF
CER
V
IN
= 3.6V
90
80
70
60
50
V
IN
= 5.0V
V
IN
= 4.2V
0.1
1
10
100
1000
OUTPUT CURRENT (mA)
Figure 1a. High Efficiency Step-Down Converter
Figure 1b. Efficiency vs Load Current
2007-Aug, Rev 1.0
1
kB3361
KINGBOR [ KINGBOR TECHNOLOGY CO ]
