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KB3426-ADJ Datasheet(PDF) 1 Page - Kingbor Technology Co

Part # KB3426-ADJ
Description  1.5MHz, 800mA Synchronous Step-Down Regulator in SOT23-5
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Manufacturer  KINGBOR [Kingbor Technology Co]
Direct Link  http://www.kingbor.com
Logo KINGBOR - Kingbor Technology Co

KB3426-ADJ Datasheet(HTML) 1 Page - Kingbor Technology Co

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1
High Efficiency: Up to 96%
Very Low Quiescent Current: Only 20
µA
During Operation
800mA Output Current
2.5V to 6.5V Input Voltage Range
1.5MHz Constant Frequency Operation
No Schottky Diode Required
Low Dropout Operation: 100% Duty Cycle
0.6V Reference Allows Low Output Voltages
Shutdown Mode Draws 1
µA Supply Current
Current Mode Operation for Excellent Line and
Load Transient Response
Overtemperature Protected
Low Profile (1mm) SOT23-5 Package
The
KB3426 is a high efficiency monolithic synchro-
nous buck regulator using a constant frequency, current
mode architecture. The device is available in an adjustable
version and fixed output voltages of 1.8V and 3.3V. Supply
current during operation is only 20
µA and drops to 1µA
in shutdown. The 2.5V to 5.5V input voltage range makes
the KB3426 ideally suited for single Li-Ion battery-pow-
ered applications. 100% duty cycle provides low dropout
operation, extending battery life in portable systems.
Automatic Burst Mode operation increases efficiency at
light loads, further extending battery life.
Switching frequency is internally set at 1.5MHz, allowing
the use of small surface mount inductors and capacitors.
The internal synchronous switch increases efficiency and
eliminates the need for an external Schottky diode. Low
output voltages are easily supported with the 0.6V feed-
back reference voltage. The KB3426 is available in a low
profile (1mm) SOT23-5 package.
Cellular Telephones
Personal Information Appliances
Wireless and DSL Modems
Digital Still Cameras
MP3 Players
Portable Instruments
Figure 1a. High Efficiency Step-Down Converter
1.5MHz,
Synchronous Step-Down
Regulator in
Figure 1b. Efficiency vs Load Current
VIN
CIN
4.7
µF
Tan
VIN
3.6V
TO 6.5V
KB3426-3.3
RUN
3
4.7
µH
5
4
1
2
SW
VOUT
GND
COUT
10
µF
CER
VOUT
3.3V
800mA
OUTPUT CURRENT (mA)
70
80
90
95
0.1
10
100
1000
60
1
85
75
65
VIN = 3.6V
VOUT = 3.3V
VIN = 4.2V
VIN = 3.8V
KB3426
SOT23-5
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
APPLICATIONS
FEATURES
DESCRIPTION
TYPICAL APPLICATION
800mA
+


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