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Kingbor Technology |
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB3302
2Amp, 2MHz Step-up Switching
regulator with Soft-Start
FEATURES
■ Up to 95% Efficiency
■ TDB uA No Load Current
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■ 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
VIN = 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
100nF
GND
4
ROSC
8
R3
10.7k
R3
17.4k
1nF
R1
300k
R2
100k
VOUT
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
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB3302
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Supply Voltage .................................. – 0.3V to 18V
SHDN, V FB Voltages .................................. – 0.3V to 5V
SW Voltage ................................................ – 0.3V to 32V
PACkAGE/ORDER INFORMATION
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TOP VIEW
COMP 1
FB 2
SHDN 3
GND 4
GND 5
GND
10 SS
9 ROSC
8 VIN
7 SW
6 SW
ORDER PART
NUMBER
KB3302DD
3000 Units on Tape and Reel
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
DD PART MARKING
EXPOSED PAD IS PGND (PIN 11)
MUST BE CONNECTED TO GND
TJMAX = 125°C, θJA = 45°C/W, θJC = 10°C/W
Peak SW Sink and Source Current ........................ 2A
Operating Temperature Range (Note 2) .. – 40°C to 85°C
Junction Temperature (Note 3) ............................ 125°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
TOP VIEW
COMP 1
FB 2
SHDN 3
GND 4
GND
8 SS
7 ROSC
6 VIN
5 SW
8-LEAD PLASTIC MSOP
EXPOSED PAD IS PGND
MUST BE CONNECTED TO GND
TJMAX = 125°C, θJA = 45°C/W, θJC = 10°C/W
ORDER PART
NUMBER
KB3302EMS
2500 Units on Tape and Reel
EMS PART MARKING
ELECTRICAL CHARACTERISTICS
Unless specified: V = 2V, SHDN = 1.5V,
IN
ROSC
= 7.68kΩ,
-40°C < T = T <
AJ
85°C
Parameter
Test Conditions
Undervoltage Lockout Threshold
Maximum Operating Voltage
Feedback Voltage
Feedback Voltage Line
Regulation
FB Pin Bias Current
TA = 25°C
-40°C < TA < 85°C
1.5V < VIN < 16V
Error Amplifier Transconductance
Error Amplifier Open-Loop Gain
COMP Source Current
COMP Sink Current
V
IN
Quiescent
Supply
Current
VIN Supply Current in Shutdown
Switching Frequency
VFB = 1.1V
VFB = 1.4V
VSHDN = 1.5V, VCOMP = 0 ( Not Switching )
VSHDN = 0
Maximum Duty Cycle
Minimum Duty Cycle
Switch Current Limit
Switch Saturation Voltage
ISW = 2A
Min
1.224
1.217
1.3
85
2
2
Typ
1.3
1.242
0.01
40
60
49
5
5
1.1
10
1.5
90
2.8
220
Max
1.4
16
1.260
1.267
80
1.6
18
1.7
0
350
Unit
V
V
V
V
%
nA
µΩ−1
dB
µA
µA
mA
µA
MHz
%
%
A
mV
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