UNISONIC TECHNOLOGIES CO., LTD
UC3383
PFM CONTROLLED, STEP-UP
DC/DC CONVERTERS
(VARIABLE DUTY RATIO)
DESCRIPTION
The UTC
UC3383
Series are PFM step-up DC/DC switching
converter. The UTC
UC3383
can support both large and small
currents. It automatically switches duty ratio (45%/75%) when it
senses changes in load.
Both built-in and external transistor types include 5-pin and 3-pin
packages, which are provided with either a CE (chip enable)
function that reduces power consumption during shut-down mode,
or a V
DD
pin function (separated power and voltage detect pins).
4
5
3
CMOS IC
1
2
SOT-25
1
SOT-89
FEATURES
* Output voltage range: 2.0V~7.0V in 0.1V increments
* Operating (start-up) voltage range: 0.9V~10V
* Highly accurate: Set-up voltage ±2.5%
* Maximum oscillator frequency (Max Fosc1): 180kHz (±15%)
* Variable Duty Ratio: 45%/75% (±5%)
* Both switching transistor built-in and external types are available
* 5-lead package offer Chip Enable or independent V
OUT
pin option.
Lead-free:
UC3383L
Halogen-free: UC3383G
ORDERING INFORMATION
Normal
UC3383-xx-AB3-R
UC3383-xx-AF5-R
Ordering Number
Lead Free
UC3383L-xx-AB3-R
UC3383L-xx-AF5-R
Halogen-Free
UC3383G-xx-AB3-R
UC3383G-xx-AF5-R
Package
SOT-89
SOT-25
Pin Assignment
Packing
1
2
3
4
5
V
SS
V
OUT
Lx
-
- Tape Reel
CE V
OUT
NC V
SS
Lx Tape Reel
Note: Pin Assignment: NC: No Connection CE: Chip Enable
xx: Output Voltage, refer to Marking Information.
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Copyright © 2008 Unisonic Technologies Co., Ltd.
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QW-R502-032,G
UC3383
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
20:2.0V
25:2.5V
26:2.6V
27:2.7V
28:2.8V
30:3.0V
31:3.1V
32:3.2V
33:3.3V
36:3.6V
37:3.7V
40:4.0V
45:4.5V
50:5.0V
MARKING
3
2
1
L: Lead Free
L: Halogen Free
Voltage Code
4
5
CMOS IC
SOT-25
H3
SOT-89
PIN DESCRIPTION
PIN NO.
SOT-25 SOT-89
1
-
2
2
3
-
4
1
5
3
PIN NAME
CE
V
OUT
NC
V
SS
Lx
FUNCTION
Chip Enable
Output voltage monitor, IC internal power supply
No Connection
Ground
Switch
BLOCK DIAGRAM
UTC UC3383 (V
DD
is internally connected to the V
OUT
pin.)
V
DD
Lx
Buffer
Vss
2step PFM Control
OSC 100/180 kHz
+
-
+
-
~5mV
V
Lx
limiter
V
REF
V
OUT
Chip Enable
CE
Note: The CE pin is only used with the 5-Lead Package.
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QW-R502-032,G
UC3383
ABSOLUTE MAXIMUM RATINGS
PARAMETER
(Ta=25
℃
)
SYMBOL
V
OUT
V
Lx
V
CE
V
DD
I
LX
CMOS IC
RATINGS
UNIT
V
OUT
Input Voltage
12
V
Lx pin Voltage
12
V
CE Input Voltage
12
V
V
DD
Input Voltage
12
V
Lx pin Current
400
mA
SOT-89
500
mW
Power Dissipation
P
D
SOT-25
250
mW
Operating Junction Temperature
T
J
+125
℃
Operating Ambient Temperature
T
OPR
-30 ~ +80
℃
Storage Temperature
T
STG
-40 ~ +125
℃
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.
ELECTRICAL CHARACTRISTICS
(Ta=25℃, V
IN
=V
OUT
× 0.6, unless otherwise specified.)
UTC UC3383-2.0V
(I
OUT
=10mA)
PARAMETER
SYMBOL
TEST CONDITIONS
Output Voltage
V
OUT
L, SD, C
L
etc. connected
Maximum Input Voltage
V
IN
Oscillation Start-up Voltage
V
ST
I
OUT
=1mA
Oscillation Hold Voltage
V
HLD
I
OUT
=1mA
Lx Limit Voltage
V
LxLMT
Same as I
DD1
. Fosc>Fosc1×2
No-Load Input Current
I
IN
I
OUT
=0mA (Note 1)
Supply Current 1(Note 2)
I
DD1
V
IN
=V
OUT
×0.95
Supply Current 2
I
DD2
V
IN
=V
OUT
+0.5V
Lx Leakage Current
I
LXL
No external components, V
OUT
=V
Lx
=10V.
Lx Switch-On Resistance
R
SWON
Same as I
DD1
. V
Lx
=0.4V
Duty Ratio 1
DTY1 Same as I
DD1
. Measuring of Lx waveform
Duty Ratio 2
DTY2 I
OUT
=1mA. Measuring of Lx on-time
Efficiency
EFFI L, SD, C
L
etc. connected
Fosc1 Same as I
DD1
. 75% duty
Maximum Oscillation Frequency
Fosc2 Same as I
DD1
. 45% duty
For 5-Pins package Only
Same as I
DD1
.
High
V
CEH
Existence of Lx Oscillation.
CE Voltage
Same as I
DD1
.
Low
V
CEL
Disappearance of Lx Oscillation
High
I
CEH
Same as I
DD1
. V
CE
=V
OUT
×0.95
CE ”High” Current
Low
I
CEL
Same as I
DD1
. V
CE
=0V
Stand-by Current
I
STB
Same as I
DD1
.
MIN
1.950
TYP MAX UNIT
2.000 2.050
V
10
V
0.80
0.90
V
V
1.1
V
4.3
8.6
μA
13.6
27.3
μA
1.9
3.9
μA
1.0
μA
9.1
13.7
Ω
75
80
%
55
60
%
70
%
120
130
kHz
180
210
kHz
V
0.20
0.25
-0.25
0.5
V
μA
μA
μA
0.70
0.7
70
50
100
150
0.75
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QW-R502-032,G
UC3383
ELECTRICAL CHARACTRISTICS(Cont.)
UTC UC3383-2.5V
(I
OUT
=10mA)
PARAMETER
SYMBOL
TEST CONDITIONS
Output Voltage
V
OUT
L, SD, C
L
etc. connected
Maximum Input Voltage
V
IN
Oscillation Start-up Voltage
V
ST
I
OUT
=1mA
Oscillation Hold Voltage
V
HLD
I
OUT
=1mA
Lx Limit Voltage
V
LxLMT
Same as I
DD1
. Fosc>Fosc1×2
No-Load Input Current
I
IN
I
OUT
=0mA (Note 1)
Supply Current 1(Note 2)
I
DD1
V
IN
=V
OUT
×0.95
Supply Current 2
I
DD2
V
IN
=V
OUT
+0.5V
Lx Leakage Current
I
LXL
No external components, V
OUT
=V
Lx
=10V.
Lx Switch-On Resistance
R
SWON
Same as I
DD1
. V
Lx
=0.4V
Duty Ratio 1
DTY1 Same as I
DD1
. Measuring of Lx waveform
Duty Ratio 2
DTY2 I
OUT
=1mA. Measuring of Lx on-time
Efficiency
EFFI L, SD, C
L
etc. connected
Fosc1 Same as I
DD1
. 75% duty
Maximum Oscillation Frequency
Fosc2 Same as I
DD1
. 45% duty
For 5-Pins package Only
Same as I
DD1
.
High
V
CEH
Existence of Lx Oscillation.
CE Voltage
Same as I
DD1
.
Low
V
CEL
Disappearance of Lx Oscillation
High
I
CEH
Same as I
DD1
. V
CE
=V
OUT
×0.95
CE ”High” Current
Low
I
CEL
Same as I
DD1
. V
CE
=0V
Stand-by Current
I
STB
Same as I
DD1
.
UTC UC3383-2.6V
(I
OUT
=10mA)
PARAMETER
SYMBOL
TEST CONDITIONS
Output Voltage
V
OUT
L, SD, C
L
etc. connected
Maximum Input Voltage
V
IN
Oscillation Start-up Voltage
V
ST
I
OUT
=1mA
Oscillation Hold Voltage
V
HLD
I
OUT
=1mA
Lx Limit Voltage
V
LxLMT
Same as I
DD1
. Fosc>Fosc1×2
No-Load Input Current
I
IN
I
OUT
=0mA (Note 1)
Supply Current 1(Note 2)
I
DD1
V
IN
=V
OUT
×0.95
Supply Current 2
I
DD2
V
IN
=V
OUT
+0.5V
Lx Leakage Current
I
LXL
No external components, V
OUT
=V
Lx
=10V.
Lx Switch-On Resistance
R
SWON
Same as I
DD1
. V
Lx
=0.4V
Duty Ratio 1
DTY1 Same as I
DD1
.Measuring of Lx waveform
Duty Ratio 2
DTY2 I
OUT
=1mA. Measuring of Lx on-time
Efficiency
EFFI L, SD, C
L
etc. connected
Fosc1 Same as I
DD1
. 75% duty
Maximum Oscillation Frequency
Fosc2 Same as I
DD1
. 45% duty
For 5-Pins package Only
Same as I
DD1
.
High
V
CEH
Existence of Lx Oscillation.
CE Voltage
Same as I
DD1
.
Low
V
CEL
Disappearance of Lx Oscillation
High
I
CEH
Same as I
DD1
. V
CE
=V
OUT
×0.95
CE ”High” Current
Low
I
CEL
Same as I
DD1
. V
CE
=0V
Stand-by Current
I
STB
Same as I
DD1
.
CMOS IC
MIN TYP MAX UNIT
2.438 2.500 2.563
V
10
V
0.80 0.90
V
0.70
V
0.7
1.1
V
4.45 8.95
μA
16.65 33.35
μA
2.0
4.05
μA
1.0
μA
7.15 10.8
Ω
70
75
80
%
40
45
50
%
70
%
100
120
130
kHz
150
180
210
kHz
0.75
0.20
0.25
-0.25
0.5
V
V
μA
μA
μA
MIN TYP MAX UNIT
2.535 2.600 2.665
V
10
V
0.80 0.90
V
0.70
V
0.7
1.1
V
4.48 9.02
μA
17.26 34.56
μA
2.02 4.08
μA
1.0
μA
6.76 10.22
Ω
70
75
80
%
40
45
50
%
70
%
100
120
130
kHz
150
180
210
kHz
0.75
0.20
0.25
-0.25
0.5
V
V
μA
μA
μA
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QW-R502-032,G
UC3383
ELECTRICAL CHARACTRISTICS(Cont.)
UTC UC3383-2.7V
(I
OUT
=10mA)
PARAMETER
SYMBOL
TEST CONDITIONS
Output Voltage
V
OUT
L, SD, C
L
etc. connected
Maximum Input Voltage
V
IN
Oscillation Start-up Voltage
V
ST
I
OUT
=1mA
Oscillation Hold Voltage
V
HLD
I
OUT
=1mA
Lx Limit Voltage
V
LxLMT
Same as I
DD1
. Fosc>Fosc1×2
No-Load Input Current
I
IN
I
OUT
=0mA (Note 1)
Supply Current 1(Note 2)
I
DD1
V
IN
=V
OUT
×0.95
Supply Current 2
I
DD2
V
IN
=V
OUT
+0.5V
Lx Leakage Current
I
LXL
No external components, V
OUT
=V
Lx
=10V.
Lx Switch-On Resistance
R
SWON
Same as I
DD1
. V
Lx
=0.4V
Duty Ratio 1
DTY1 Same as I
DD1
.Measuring of Lx waveform
Duty Ratio 2
DTY2 I
OUT
=1mA. Measuring of Lx on-time
Efficiency
EFFI L, SD, C
L
etc. connected
Fosc1 Same as I
DD1
. 75% duty
Maximum Oscillation Frequency
Fosc2 Same as I
DD1
. 45% duty
For 5-Pins package Only
Same as I
DD1
.
High
V
CEH
Existence of Lx Oscillation.
CE Voltage
Same as I
DD1
.
Low
V
CEL
Disappearance of Lx Oscillation
High
I
CEH
Same as I
DD1
. V
CE
=V
OUT
×0.95
CE ”High” Current
Same as I
DD1
. V
CE
=0V
Low
I
CEL
Stand-by Current
I
STB
Same as I
DD1
.
UTC UC3383-2.8V
(I
OUT
=10mA)
PARAMETER
SYMBOL
TEST CONDITIONS
Output Voltage
V
OUT
L, SD, C
L
etc. connected
Maximum Input Voltage
V
IN
Oscillation Start-up Voltage
V
ST
I
OUT
=1mA
Oscillation Hold Voltage
V
HLD
I
OUT
=1mA
Lx Limit Voltage
V
LxLMT
Same as I
DD1
. Fosc>Fosc1×2
No-Load Input Current
I
IN
I
OUT
=0mA (Note 1)
Supply Current 1(Note 2)
I
DD1
V
IN
=V
OUT
×0.95
Supply Current 2
I
DD2
V
IN
=V
OUT
+0.5V
Lx Leakage Current
I
LXL
No external components, V
OUT
=V
Lx
=10V.
Lx Switch-On Resistance
R
SWON
Same as I
DD1
. V
Lx
=0.4V
Duty Ratio 1
DTY1 Same as I
DD1,
.Measuring of Lx waveform
Duty Ratio 2
DTY2 I
OUT
=1mA. Measuring of Lx on-time
Efficiency
EFFI L, SD, C
L
etc. connected
Fosc1 Same as I
DD1
. 75% duty
Maximum Oscillation Frequency
Fosc2 Same as I
DD1
. 45% duty
For 5-Pins package Only
Same as I
DD1
.
High
V
CEH
Existence of Lx Oscillation.
CE Voltage
Same as I
DD1
.
Low
V
CEL
Disappearance of Lx Oscillation
High
I
CEH
Same as I
DD1
. V
CE
=V
OUT
×0.95
CE ”High” Current
Low
I
CEL
Same as I
DD1
. V
CE
=0V
Stand-by Current
I
STB
Same as I
DD1
.
CMOS IC
MIN
TYP MAX
2.633 2.700 2.768
10
0.80
0.90
0.70
0.7
1.1
4.51
9.09
17.87 35.77
2.04
4.11
1.0
6.37
9.64
70
75
80
40
45
50
70
100
120
130
150
180
210
0.75
0.20
0.25
-0.25
0.5
UNIT
V
V
V
V
V
μA
μA
μA
μA
Ω
%
%
%
kHz
kHz
V
V
μA
μA
μA
MIN
TYP MAX
2.730 2.800 2.870
10
0.80
0.90
0.70
0.7
1.1
4.54
9.16
18.48 36.98
2.06
4.14
1.0
5.98
9.06
70
75
80
40
45
50
70
100
120
130
150
180
210
0.75
0.20
0.25
-0.25
0.5
UNIT
V
V
V
V
V
μA
μA
μA
μA
Ω
%
%
%
kHz
kHz
V
V
μA
μA
μA
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QW-R502-032,G
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