KB3361 Datasheet, PDF (1/6 Pages) Kingbor Technology Co – 1.4MHz 800mA High Efficiency Synchronous Step-Down Regulator in SOT23-5

Kingbor Technology Co.,Ltd
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KB3361
1.4MHz 800mA
High Efficiency Synchronous Step-Down
Regulator in SOT23-5
FEATURES
■ _{High Efficiency: Up to 97%}
■ _{75µA 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
■ _{Cellular Telephones}
■ _{Personal Information Appliances}
■ _{Wireless and DSL Modems}
■ _{Digital Still Cameras}
■ _{MP3 Players}
■ _{Portable Instruments}
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-
ning a low 7257µA no load quiescent current. The 1.4MHz
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.
TYPICAL APPLICATION
V_IN
3.6V
to 6.5V
+ ^CIN
10 µF
4
V_IN
3
SW
KB3361
1
RUN
5
V_FB
GND
2
4.7µH
22pF
450k
100k
C_OUT
10µF
CER
V_OUT
3.3V
800mA
Figure 1a. High Efficiency Step-Down Converter
100
V_IN = 3.6V
90
80
V_IN = 5.0V
V_IN = 4.2V
70
60
50
0.1
1
10
100
OUTPUT CURRENT (mA)
1000
Figure 1b. Efficiency vs Load Current
2007-Aug, Rev 1.0
1
kB3361