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Kingbor Technology - 800mA Synchronous Step-Down Regulator

Numéro de référence KB3426
Description 800mA Synchronous Step-Down Regulator
Fabricant Kingbor Technology 
Logo Kingbor Technology 





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KB3426 fiche technique
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
FEATURES
High Efficiency: Up to 96%
Very Low Quiescent Current: Only 20µA
www.DataSheDeut4rUin.cgomOperation
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 ) 1µA Supply Current
Current Mode Operation for Excellent Line and
Load Transient Response
Overtemperature Protected
Low Profile (1mm) SOT23-5 Package
APPLICATIONS
Cellular Telephones
Personal Information Appliances
Wireless and DSL Modems
Digital Still Cameras
MP3 Players
Portable Instruments
KB3426
1.5MHz, 800mA
Synchronous Step-Down
Regulator in SOT23-5
DESCRIPTION
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 20µA 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.
TYPICAL APPLICATION
VIN
3.6V
TO 6.5V
+ CIN
4.7µF
Tan
4
VIN
4.7µH
3
SW
KB3426-3.3
15
RUN VOUT
GND
2
COUT
10µF
CER
VOUT
3.3V
800mA
Figure 1a. High Efficiency Step-Down Converter
95
VIN = 3.6V
90
85
VIN = 3.8V
80
VIN = 4.2V
75
70
65
60
0.1
VOUT = 3.3V
1 10 100
OUTPUT CURRENT (mA)
1000
Figure 1b. Efficiency vs Load Current
1

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