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PDF ( 数据手册 , 数据表 ) KB3302

零件编号 KB3302
描述 2MHz Step-up Switching regulator
制造商 Kingbor Technology
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KB3302 数据手册, 描述, 功能
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
www.DataSheet4U.com
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







KB3302 pdf, 数据表
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB3302
APPLICATIONS INFORMATION
The absolute maximum operating frequency of the
converter is therefore DMIN = 0.25 = 1.67MHz . The
150ns 150ns
actual operating frequency needs to be lower to allow for
modulating headroom.
The power transistor in the KB3302 is turned off every
www.DatasSwheietct4hUi.ncogmperiod for an interval determined by the
discharge time of the oscillator ramp and the propagation
delay of the power switch. This minimum off time limits
the maximum duty cycle of the regulator at a given
VOUT
switching frequency. A boost converter with high VIn ratio
requires long switch on time and high duty cycle. If the
required duty cycle is higher than the attainable maximum,
then the converter will operate in dropout. (Dropout is a
condition in which the regulator cannot attain its set
output voltage below current limit.)
The minimum off times of closed-loop boost converters set
to various output voltages were measured by lowering their
input voltages until dropout occurs. It was found that the
minimum off time of the KB3302 ranged from 80 to 110ns
at room temperature.
IL
=
D(VIN
)VCESAT
fL
(5)
where f is the switching frequency and L is the inductance.
Substituting (3) into (5) and neglecting V ,
CESAT
IL
=
VIN
fL
⎜⎜⎝⎛1
VIN
VOUT +
VD
⎟⎟⎠⎞
(6)
In current-mode control, the slope of the modulating
(sensed switch current) ramp should be steep enough to
lessen jittery tendency but not so steep that large flux swing
decreases efficiency. Inductor ripple current IL between
25-40% of the peak inductor current limit is a good
compromise. Inductors so chosen are optimized in size
and DCR.
Setting
IL
=
0.3•(2)
=
0.6A,
V =0.5V
D
in
(6),
L
=
VIN
fIL
⎜⎜⎝⎛1
VIN
VOUT +
VD
⎟⎟⎠⎞
=
VIN
0.6f
⎜⎜⎝⎛1
VIN
VOUT + 0.5
⎟⎞
⎟⎠
(7)
where L is in µH and f is in MHz.
Equation
(6)
shows
that
for
a
given
V,
OUT
IL
is
the
highest
when
VIN
=
(VOUT + VD ) . If V varies over a wide range, then
2 IN
choose L based on the nominal input voltage.
Beware of dropout when operating at very low input voltages
(1.5-2V) and with off times approaching 110ns. Shorten
the PCB trace between the power source and the device
input pin, as line drop may be a significant percentage of
the input voltage. A regulator in dropout may appear as if
it is in current limit. The cycle-by-cycle current limit of the
KB3302 is duty-cycle and input voltage invariant and is
typically 2.8A. If the switch current limit is not at least 2A,
then the converter is likely in dropout. The switching
frequency should then be lowered to improve controllability.
Both the minimum on time and the minimum off time
reduce control range of the PWM regulator. Bench
measurement showed that reduced modulating range
started to be a problem at frequencies over 2MHz. Although
the oscillator is capable of running well above 2MHz,
controllability limits the maximum operating frequency.
Inductor Selection
The inductor ripple current IL of a boost converter
operating in continuous-conduction mode is
The saturation current of the inductor should be 20-30%
higher than the peak current limit (2.8A). Low-cost powder
iron cores are not suitable for high-frequency switching
power supplies due to their high core losses. Inductors
with ferrite cores should be used.
Input Capacitor
The input current in a boost converter is the inductor
current, which is continuous with low RMS current ripples.
A 2.2-4.7µF ceramic input capacitor is adequate for most
applications.
Output Capacitor
Both ceramic and low ESR tantalum capacitors can be
used as output filtering capacitors. Multi-layer ceramic
capacitors, due to their extremely low ESR (<5m), are
the best choice. Use ceramic capacitors with stable
temperature and voltage characteristics. One may be
tempted to use Z5U and Y5V ceramic capacitors for
output filtering because of their high capacitance and
8







KB3302 equivalent, schematic
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
PACAGE DESCRIPTION - MSOP8
KB3302
www.DataSheet4U.com
2X E/2
PIN 1
INDICATOR
ccc C
2X N/2 TIPS
aaa C
SEATING
PLANE
C
e/2
AD
N
E1 E
12
e
B
D
A2 A
DIMENSIONS
DIM
INCHES
MIN NOM MAX
MILLIMETERS
MIN NOM MAX
A-
- .043 -
- 1.10
A1 .000 - .006 0.00 - 0.15
A2 .030 - .037 0.75 - 0.95
b .009 - .015 0.22 - 0.38
c .003 - .009 0.08 - 0.23
D .114 .118 .122 2.90 3.00 3.10
E1 .114 .118 .122 2.90 3.00 3.10
E .193 BSC
4.90 BSC
e .026 BSC
0.65 BSC
F .068 .076 .080 1.73 1.93 2.03
L .016 .024 .032 0.40 0.60 0.80
L1 (.037)
(0.95)
N8
8
01 0° - 8° 0° - 8°
aaa .004
0.10
bbb .005
0.13
ccc .010
0.25
A1
bxN
bbb
F
C A-B D
GAGE
PLANE
H
c
EXPOSED PAD
0.25
F
L
(L1)
01
DETAIL A
BOTTOM VIEW
SIDE VIEW
NOTES:
1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
2. DATUMS -A- AND -B- TO BE DETERMINED AT DATUM PLANE-H-
3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS
OR GATE BURRS.
4. REFERENCE JEDEC STD MO-187, VARIATION AA-T.
SEE DETAIL A
Land Pattern - MSOP-8L-EDP
F
(C) G
P
FZ
X
DIM
C
F
G
P
X
Y
Z
DIMENSIONS
INCHES MILLIMETERS
(.161)
(4.10)
.081 2.08
.098 2.50
.026 0.65
.016 0.40
.063 1.60
.224 5.70
NOTES:
1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY.
CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR
COMPANY'S MANUFACTURING GUIDELINES ARE MET.
16










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