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PDF KB3361 Data sheet ( Hoja de datos )
| Número de pieza | KB3361 | |
| Descripción | 1.4MHz 800mA High Efficiency Synchronous Step-Down Regulator | |
| Fabricantes | Kingbor Technology | |
| Logotipo |  |
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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
■ High Efficiency: Up to 97%
■ 75µA No Load Quiescent Current
www.DataSh■eet840U0.cmomA 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
VIN
3.6V
to 6.5V
+ CIN
10 µF
4
VIN
3
SW
KB3361
1
RUN
5
VFB
GND
2
4.7µH
22pF
450k
100k
COUT
10µF
CER
VOUT
3.3V
800mA
Figure 1a. High Efficiency Step-Down Converter
100
VIN = 3.6V
90
80 VIN = 5.0V
VIN = 4.2V
70
60
50
0.1
1 10 100
OUTPUT CURRENT (mA)
Figure 1b. Efficiency vs Load Current
1000
2007-Aug, Rev 1.0
1
kB3361
1 page  
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
SIMPLIFIED BLOC DIAGRAM
KB3361
SLOPE
COMP
OSC
OSC
www.DataSheet4U.com
FREQ
SHIFT
5
VFB/VOUT
+
R1 0.6V
FB – EA
R2
–
+
1
RUN
VIN
0.6V REF
SHUTDOWN
0.65V
– SLEEP
0.4V +
BURST
–+
ICOMP
SQ
RQ
RS LATCH
SWITCHING
LOGIC
AND
BLANKING
CIRCUIT
ANTI-
SHOOT-
THRU
IRCMP
TYPICAL APPLICATION
Tiny 3.3V/800mA Buck Regulator
VIN
3.6V
to 6.5V
+ CIN
4.7µF
4
VIN
3
SW
KB3361
1
RUN
5
VFB
GND
2
4.7µH
22pF
VOUT
3.3V
800mA
COUT**
10µF
CER
450k
100k
** TAIYO YUDEN JMK316BJ106ML
100
VIN = 5V
95 VOUT = 3.3V
90
85
80
75
70
65
60
0.1
1 10 100
OUTPUT CURRENT (mA)
1000
VOUT
100mV/DIV
AC COUPLED
IL
500mA/DIV
ILOAD
500mA/DIV
VIN = 5V
20µs/DIV
VOUT = 3.3V
ILOAD = 200mA TO 800mA
2007-Aug, Rev 1.0
5
4 VIN
51
3 SW
2 GND
kB3361
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet KB3361.PDF ] | |
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