KB3302 Datasheet, PDF (1/17 Pages) Kingbor Technology Co – 2Amp, 2MHz Step-up Switching regulator with Soft-Start

Kingbor Technology Co.,Ltd
TEL:[phone] FAX:[phone]
KB3302
2Amp, 2MHz Step-up Switching
regulator with Soft-Start
FEATURES
■ _{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}
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.
APPLICATIONS
■ _{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
L1
3.3µH

C1
4.7µF



6
VIN
3 _{SHDN KB3302}
7 _{SS MSOP8}
1N5819
5
SW
FB ²
COMP ¹
GND
100nF
4
ROSC
8
R3
10.7k
R3
17.4k
1nF
R1
300k
R2
100k
V_OUT
5.0V
1000mA
C3
22 µF
L1: Sumida CR43
Figure 1. 1.2MHzAll Ceramic Capacitor Single Li-ion Cell
to 5V Boost Converter.
KB3302 Efficiency
95
VOUT = 5V
90
1.2MHz
85
80
VIN = 4.2V
75
70
65
60
VIN = 3.6V
55
VIN = 2.6V
50
0.001
0.010
0.100
Load Current (A)
1.000
1