Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB3302
2Amp, 2MHz Step-up Switching
regulator with Soft-Start
FEATURES
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DESCRIPTION
The KB3302 is a high-frequency current-mode step-up
switching regulator with an integrated 2A power transis-
tor. Its high switching frequency (programmable up to
2MHz) allows the use of tiny surface-mount external pas-
sive components. Programmable soft-start eliminates high
inrush current during start-up. The internal switch is rated
at 32V making the converter suitable for high voltage ap-
plications such as Boost, SEPIC and Flyback.
The operating frequency of the KB3302 can be set with an
external resistor. The ability to set the operating frequency
gives the KB3302 design flexibilities. A dedicated COMP
pin allows optimization of the loop response. The KB3302
is available in thermally enhanced 8-Pin MSOP packages.
Up to 95% Efficiency
TDB uA No Load Current
1000mA Output Current
1.5V to 16V Input Voltage Range
Programmable switching frequency up to 2MHz
Output voltage up to 32V
Constant switching frequency current-mode control
1.23V Reference Allows Low Output Voltages
Shutdown Mode Draws
10
µA
Supply Current
Low saturation voltage switch: 220mV at 2A
Overtemperature Protected,Soft-Start function
8-Pin MSOP Packages
APPLICATIONS
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Flat screen LCD bias supplies
TFT bias supplies
XDSL power supplies
Medical equipment
Digital video cameras
Portables devices
White LED power supplies
TYPICAL APPLICATION
V
IN
= 3.3V
TO 4.2V
C1
4.7µF
L1
3.3µH
1N5819
KB3302 Efficiency
V
OUT
5.0V
1000mA
95
V
OUT
= 5V
90
1.2MHz
V
IN
= 4.2V
6
VIN
5
SW
R1
300k
85
3
7
KB3302
SS
GND
MSOP8
COMP
ROSC
1
R3
17.4k
1nF
R2
100k
Efficiency (%)
SHDN
FB
2
C3
22
µF
80
75
70
65
60
V
IN
= 3.6V
100nF
4
8
R3
10.7k
V
IN
= 2.6V
L1: Sumida CR43
55
50
0.001
Figure 1. 1.2MHzAll Ceramic Capacitor Single L
i-ion Cell
to 5V Boost Converter.
0.010
0.100
1.000
Load Current (A)
1
KINGBOR [ KINGBOR TECHNOLOGY CO ]
