UNISONIC TECHNOLOGIES CO., LTD
UC8383
STEP-UP DC/DC CONVERTER
DESCRIPTION
CMOS IC
The UTC
UC8383
is a high efficiency VFM controlled step-up
DC/DC converter. The UTC
UC8383
is designed to have low start
up voltage and low quiescent current: The UTC
UC8383
can
realize the conversion from the input voltage to the selected
output voltage (2.5V ~ 5.0V) only using an inductor, a diode and
an output capacitor.
Its typical applications include: cellular telephones, pagers,
video camera, PDA and hand held instruments, palmtop,
notebook computer, portable equipment and battery powered
equipment.
FEATURES
* 0.8V Start-Up Voltage
* Low Supply Current of Typical be18μA
* Wide Output Voltage Range of 2.5V~5.0V
* Output Voltage Accuracy ±2%
* Output Current Up to 100mA
* Low Ripple and Low Noise
* High Efficiency Up to 85%
* Low Profile and Minimum External Components
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
UC8383L-xx-AB3-R
UC8383G-xx-AB3-R
Package
SOT-89
Pin Assignment
1
2
3
V
SS
V
OUT
L
X
Packing
Tape Reel
UC8383L-xx-AB3-R
(1)Packing Type
(2)Package Type
(3)Voltage Code
(4)Lead Free
(1) R: Tape Reel
(2) AB3: SOT-89
(3) xx: refer to Marking Information
(4) L: Lead Free, G: Halogen Free
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Copyright © 2013 Unisonic Technologies Co., Ltd
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QW-R502-204.F
UC8383
MARKING INFORMATION
VOLTAGE CODE
25:2.5V
27:2.7V
28:2.8V
30:3.0V
33:3.3V
36:3.6V
50:5.0V
MARKING
PACKAGE
CMOS IC
Date Code
SOT-89
XX
UC8383
1
2
3
Voltage Code
L: Lead Free
G: Halogen Free
PIN DESCRIPTION
PIN NO
1
2
3
PIN NAME
V
SS
V
OUT
L
X
DESCRIPTION
GND
Output voltage monitor, IC internal supply voltage
Switch pin
BLOCK DIAGRAM
OUT
L
X
VI
X
Limiter
V
FM
Control
V
REF
Error
Amplifier
Oscillator
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www.unisonic.com.tw
2 of 9
QW-R502-204.F
UC8383
ABSOLUTE MAXIMUM RATING
CMOS IC
PARAMETER
SYMBOL
RATINGS
UNIT
Output Voltage
V
OUT
5.5
V
Input Voltage
V
IN
5.5
V
LX Pin Voltage
V
LX
5.5
V
LX Pin Output Current
I
LX
Internally limited
170
mW
Power Dissipation (T
A
=25°С)
P
D
Derating Rate over T
A
=25C
1.7
°С/mW
Operating Junction Temperature
T
J
-25 ~ +85
°С
Storage Temperature
T
STG
-55 ~ +125
°С
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
THERMAL DATA
SYMBOL
θ
JC
RATINGS
17
UNIT
°С/W
PARAMETER
Junction to Case
ELECTRICAL CHARACTERISTICS
(I
OUT
= 10mA, Ta = 25°С, unless otherwise specified.)
SYMBOL
V
OUT
V
START
V
HOLD
I
SUPPLY
R
LX
I
LX(LEAK)
f
OSC
D
ty
η
SYMBOL
V
OUT
V
START
V
HOLD
I
SUPPLY
R
LX
I
LX(LEAK)
f
OSC
D
ty
η
SYMBOL
V
OUT
V
START
V
HOLD
I
SUPPLY
R
LX
I
LX(LEAK)
f
OSC
D
ty
η
TEST CONDITIONS
I
OUT
= 1mA
I
OUT
= 1mA
I
OUT
= 0
I
LX
= 150mA
V
LX
= 4V, V
OUT
= 3V
MIN
2.45
0.25
TYP
2.5
0.8
0.5
18
850
120
80
82
MIN
2.646
0.25
TYP
2.7
0.8
0.5
18
850
120
80
82
MIN
2.744
0.25
TYP
2.8
0.8
0.5
18
850
120
80
82
MAX
2.856
1.2
MAX
2.754
1.2
MAX
2.55
1.2
UNIT
V
V
V
µA
mΩ
µA
KHz
%
%
UNIT
V
V
V
µA
mΩ
µA
KHz
%
%
UNIT
V
V
V
µA
mΩ
µA
KHz
%
%
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QW-R502-204.F
UC8383-2.5V
(V
IN
= 1.5V)
PARAMETER
Output Voltage
Start-up Voltage (V
IN
-V
F
) (Note 1)
Hold-on Voltage
Supply Current
Internal Switch R
DS(ON)
Internal Leakage Current
Maximum Oscillator Frequency
Oscillator Duty Cycle
Efficiency
UC8383-2.7V
(V
IN
=1.6V)
PARAMETER
Output Voltage
Start-up Voltage (V
IN
-V
F
) (Note)
Hold-on Voltage
Supply Current
Internal Switch R
DS(ON)
Internal Leakage Current
Maximum Oscillator Frequency
Oscillator Duty Cycle
Efficiency
UC8383-2.8V
(V
IN
=1.7V)
PARAMETER
Output Voltage
Start-up Voltage (V
IN
-V
F
) (Note)
Hold-on Voltage
Supply Current
Internal Switch R
DS(ON)
Internal Leakage Current
Maximum Oscillator Frequency
Oscillator Duty Cycle
Efficiency
0.5
I
OUT
= 50mA
TEST CONDITIONS
I
OUT
= 1mA
I
OUT
= 1mA
I
OUT
= 0
I
LX
= 150mA
V
LX
= 4V, V
OUT
= 3.3V
0.5
I
OUT
= 50mA
TEST CONDITIONS
I
OUT
= 1mA
I
OUT
= 1mA
I
OUT
= 0
I
LX
= 150mA
V
LX
= 4V, V
OUT
= 3.3V
0.5
I
OUT
= 50mA
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
UC8383
CMOS IC
ELECTRICAL CHARACTERISTICS(Cont.)
SYMBOL
V
OUT
V
START
V
HOLD
I
SUPPLY
R
LX
I
LX(LEAK)
f
OSC
D
ty
η
SYMBOL
V
OUT
V
START
V
HOLD
I
SUPPLY
R
LX
I
LX(LEAK)
f
OSC
D
ty
η
SYMBOL
V
OUT
V
START
V
HOLD
I
SUPPLY
R
LX
I
LX(LEAK)
f
OSC
D
ty
η
TEST CONDITIONS
I
OUT
= 1mA
I
OUT
= 1mA
I
OUT
= 0
I
LX
= 150mA
V
LX
= 4V, V
OUT
= 3.5V
MIN
2.94
0.25
TYP
3
0.8
0.5
18
850
0.1
120
80
82
TYP
3.3
0.8
0.5
18
850
120
80
84
MIN
3.528
0.25
TYP
3.6
0.8
0.5
18
850
120
80
84
MAX
3.672
1.2
MAX
3.06
1.2
UNIT
V
V
V
µA
mΩ
µA
KHz
%
%
UNIT
V
V
V
µA
mΩ
µA
KHz
%
%
UNIT
V
V
V
µA
mΩ
µA
KHz
%
%
UC8383-3.0V
(V
IN
= 1.8V)
PARAMETER
Output Voltage
Start-up Voltage (V
IN
-V
F
) (Note)
Hold-on Voltage
Supply Current
Internal Switch R
DS(ON)
Internal Leakage Current
Maximum Oscillator Frequency
Oscillator Duty Cycle
Efficiency
UC83830-3.3V
(V
IN
= 2V)
PARAMETER
Output Voltage
Start-up Voltage (V
IN
-V
F
) (Note)
Hold-on Voltage
Supply Current
Internal Switch R
DS(ON)
Internal Leakage Current
Maximum Oscillator Frequency
Oscillator Duty Cycle
Efficiency
UC83830-3.6V
(V
IN
= 2V)
PARAMETER
Output Voltage
Start-up Voltage (V
IN
-V
F
) (Note)
Hold-on Voltage
Supply Current
Internal Switch R
DS(ON)
Internal Leakage Current
Maximum Oscillator Frequency
Oscillator Duty Cycle
Efficiency
0.5
I
OUT
= 50mA
TEST CONDITIONS
I
OUT
= 1mA
I
OUT
= 1mA
I
OUT
= 0
I
LX
= 150mA
V
LX
= 4V, V
OUT
= 3.8V
MIN
3.234
0.25
MAX
3.366
1.2
0.5
I
OUT
= 50mA
TEST CONDITIONS
I
OUT
= 1mA
I
OUT
= 1mA
I
OUT
= 0
I
LX
= 150mA
V
LX
= 4V, V
OUT
= 3.8V
0.5
I
OUT
= 50mA
UC83830-5.0V
(V
IN
= 3V)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP MAX UNIT
Output Voltage
V
OUT
4.9
5.0
5.1
V
Start-up Voltage (V
IN
-V
F
) (Note)
V
START
I
OUT
= 1mA
0.8
1.2
V
Hold-on Voltage
V
HOLD
I
OUT
= 1mA
0.25
0.5
V
Supply Current
I
SUPPLY
I
OUT
= 0
18
µA
Internal Switch R
DS(ON)
R
LX
I
LX
= 150mA
700
mΩ
Internal Leakage Current
I
LX(LEAK)
V
LX
= 4V, V
OUT
= 5.5V
0.1
0.5
µA
Maximum Oscillator Frequency
f
OSC
120
KHz
Oscillator Duty Cycle
D
ty
80
%
Efficiency
η
I
OUT
= 50mA
85
%
Note: The minimum value of the device start-up voltage is strictly a function of the forward voltage (V
F
) of the diode.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
4 of 9
QW-R502-204.F
UC8383
TYPICAL APPLICATION
CMOS IC
L
V
IN
D
V
OUT
Lx
C
IN
V
SS
OUT
C
OUT
UTC UC8383
Application Circuit
Application Circuit Notes:
1. The inductors: an inductor value of 47µH performs well in this application.
2. The diode: an high switching speed and low forward voltage diode.
3. The input capacitor: A value of 4.7µF tantalum capacitor is enough to guarantee stability.
4.
The output capacitor: The best choice for the value of the output capacitance is 47µF tantalum capacitor. And
the capacitance value should be in the range of about 10µF-100µF.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R502-204.F
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