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 Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB3302
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
ORDER PART
NUMBER
8 SS
7 ROSC
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
TOP VIEW
COMP 1
FB 2
SHDN 3
GND
GND
4
5
GND
10
SS
9
ROSC
8
VIN
7
SW
6
SW
ORDER PART
NUMBER
COMP 1
TOP VIEW
KB3302DD
3000 Units on Tape and Reel
FB 2
KB3302EMS
2500 Units on Tape and Reel
GND
SHDN 3
GND 4
6 VIN
5 SW
DD PACKAGE
10-LEAD (3mm
×
3mm) PLASTIC DFN
EXPOSED PAD IS PGND (PIN 11)
MUST BE CONNECTED TO GND
DD PART MARKING
8-LEAD PLASTIC MSOP
EXPOSED PAD IS PGND
MUST BE CONNECTED TO GND
T
JMAX
= 125°C,
θ
JA
= 45°C/W,
θ
JC
= 10°C/W
EMS PART MARKING
T
JMAX
= 125°C,
θ
JA
= 45°C/W,
θ
JC
= 10°C/W
ELECTRICAL CHARACTERISTICS
Unless specified: V
IN
= 2V, SHDN = 1.5V, R
OSC
= 7.68kΩ, -40°C < T
A
= T
J
< 85°C
Parameter
Undervoltage Lockout Threshold
Maximum Operating Voltage
Feedback Voltage
Feedback Voltage Line
Regulation
FB Pin Bias Current
Error Amplifier Transconductance
Error Amplifier Open-Loop Gain
COMP Source Current
COMP Sink Current
V
IN
Quiescent Supply Current
V
IN
Supply Current in Shutdown
Switching Frequency
Maximum Duty Cycle
Minimum Duty Cycle
Switch Current Limit
Switch Saturation Voltage
Test Conditions
Min
Typ
1.3
Max
1.4
16
Unit
V
V
V
V
%
T
A
= 25°C
-40°C < T
A
< 85°C
1.5V < V
IN
< 16V
1.224
1.217
1.242
1.260
1.267
0.01
40
60
49
80
nA
µΩ
−1
dB
µA
µA
V
FB
= 1.1V
V
FB
= 1.4V
V
SHDN
= 1.5V, V
COMP
= 0 ( Not Switching )
V
SHDN
= 0
1.3
85
5
5
1.1
10
1.5
90
0
2
2.8
220
350
1.6
18
1.7
mA
µA
MHz
%
%
A
mV
I
SW
= 2A
2
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB3302
ELECTRICAL CHARACTERISTICS
Unless specified: V
IN
= 2V, SHDN = 1.5V, R
OSC
= 7.68kΩ, -40°C < T
A
= T
J
< 85°C
Parameter
Switch Leakage Current
Shutdown Threshold Voltage
Shutdown Pin Current
Soft-Start Charging Current
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Test Conditions
V
SW
= 5V
Min
Typ
0.01
Max
1
1.18
Unit
µA
V
µA
1.02
V
SHDN
= 1.2V
V
SHDN
= 0
V
SS
= 0.3V
1.1
-4.6
0
1.5
160
10
0.1
µA
µA
°C
°C
TYPICAL PERFORMANCE CHARACTERISTICS
V
IN
Current vs SHDN Pin Voltage
1.2
V
IN
= 2V
1
0.08
0.1
V
IN
= 2V
V
IN
Current vs SHDN Pin Voltage
-3
Shutdown Pin Current
vs Temperature
V
SHDN
= 1.25V
V
IN
Current (mA)
V
IN
Current (mA)
0.06
Current (
µ
A)
0.8
0.6
0.4
0.2
0
0
0.5
1
125ºC
25ºC
-4
V
IN
= 2V
0.04
-5
V
IN
= 12V
-40ºC
125ºC
-40ºC
0.02
0
-6
1.5
0
0.2
0.4
0.6
0.8
1
1.2
-50
-25
0
25
50
75
100
125
SHDN Voltage (V)
SHDN Voltage (V)
Temperature (ºC)
Soft-Start Charging Current
vs Temperature
2
Transconductance vs Temperature
80
V
SS
= 0.3V
V
IN
= 2V
Transconductance (
Ω
)
µ
70
-1
1.8
Current (
µ
A)
1.6
60
1.4
50
1.2
40
1
-50
-25
0
25
50
75
100
125
30
-50
-25
0
25
50
75
100
125
Temperature (ºC)
Temperature (ºC)
3
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB3302
Switching Frequency
vs Temperature
1.7
TYPICAL PERFORMANCE CHARACTERISTICS
Feedback Voltage vs Temperature
1.3
100
R
OSC
vs Switching Frequency
R
OSC
= 7.68KΩ
Feedback Voltage (V)
1.6
1.25
V
IN
= 2V
R
OSC
(K
Ω
)
25ºC
10
Frequency (MHz)
V
IN
= 12V
1.5
V
IN
= 2V
1.2
1.4
1.15
-50
-25
0
25
50
75
100
125
1
0.0
0.5
1.0
1.5
2.0
2.5
3.0
1.3
-50
-25
0
25
50
75
100
125
Temperature (ºC)
Frequency (MHz)
Temperature (ºC)
Switch Saturation Voltage
vs Switch Current
400
3
Switch Current Limit
vs Temperature
1.5
Minimum V
IN
vs Temperature
V
CESAT
(mV)
85ºC
200
2.6
Input Voltage (V)
-50
-25
0
25
50
75
100
Current Limit (A)
300
25ºC
2.8
1.4
1.3
-40ºC
100
2.4
1.2
2.2
1.1
0
0
0.5
1
1.5
2
2.5
3
2
1
-50
-25
0
25
50
75
100
125
Switch Current (A)
Temperature (ºC)
Temperature (ºC)
V
IN
Quiescent Current vs Temperature
1.3
V
IN
Current in Shutdown
vs Input Voltage
50
1.20
Shutdown Threshold
vs Temperature
V
IN
= 2V
Not Switching
1.2
40
Shutdown Threshold (V)
V
SHDN
= 0
V
IN
Current (mA)
1.1
V
IN
Current (
µ
A)
V
IN
= 16V
-40ºC
30
1.15
125ºC
20
1.10
1
V
IN
= 2V
0.9
1.05
10
0.8
-50
-25
0
25
50
75
100
125
0
0
5
10
15
20
1.00
-50
-25
0
25
50
75
100
125
Temperature (ºC)
Input Voltage (V)
Temperature (ºC)
4
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB3302
PIN FUNCTIONS
Pin
1
2
Pin Name
COMP
FB
Pin Function
The output of the internal transconductance error amplifier. This pin is used for loop compensation.
The inverting input of the error amplifier. Tie to an external resistive divider to set the output voltage.
Shutdown Pin. The accurate 1.1V shutdown threshold and the 4.6uA shutdown pin current
hysteresis allow the user to set the undervoltage lockout threshold and hysteresis for the switching
regulator. Pulling this pin below 0.1V causes the converter to shut down to low quiescent current.
Tie this pin to IN if the UVLO and the shutdown features are not used. This pin should not be left
floating.
Ground. Tie to the ground plane.
Collector of the internal power transistor. Connect to the boost inductor and the rectifying diode.
Power Supply Pin. Bypassed with capacitors close to the pin.
A resistor from this pin to the ground sets the switching frequency.
Soft-Start Pin. A capacitor from this pin to the ground lengthens the start-up time and reduces start-
up current.
The exposed pad must be soldered to the ground plane on the PCB for good thermal conduction.
3
SHDN
4
5
6
7
8
GND
SW
IN
ROSC
SS
Exposed Pad
SIMPLIFIED BLOC DIAGRAM
IN
6
4.6µA
SW
5
SHDN
3
+
CMP
-
1.1V
VOLTAGE
REFERENCE
THERMAL
SHUTDOW N
ENABLE
CLK
INTERNAL
SUPPLY
REG
1.242V
FB
2
COMP
1
SS
8
+
-
EA
REG
1.5µA
-
PWM
R
Q
S
+
+
ILIM
I-LIMIT
-
R
SENSE
REG_GOOD
ENABLE
Σ
+
+
+
ISEN
-
4
GND
ROSC
7
CLK
OSCILLATOR
SLOP E COMP
5
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