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.
RDERING INFORMATION
Ordering Number
Package
Lead Free
Halogen Free
UC3383L-xx-AB3-R
UC3383G-xx-AB3-R
SOT-89
UC3383L-xx-AF5-R
UC3383G-xx-AF5-R
SOT-25
Note: Pin Assignment: NC: No Connection CE: Chip Enable
xx: Output Voltage, refer to Marking Information.
1
V
SS
CE
Pin Assignment
2
3
4
V
OUT
Lx
-
V
OUT
NC V
SS
5
-
Lx
Packing
Tape Reel
Tape Reel
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QW-R502-032,J
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
CMOS IC
SOT-25
Date Code
SOT-89
XX
UC3383
1
2
3
Voltage Code
L: Lead Free
G: Halogen Free
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
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QW-R502-032,J
UC3383
BLOCK DIAGRAM
CMOS IC
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,J
UC3383
ABSOLUTE MAXIMUM RATINGS
PARAMETER
V
OUT
Input Voltage
Lx pin Voltage
CE Input Voltage
V
DD
Input Voltage
Lx pin Current
(T
A
=25°C)
SYMBOL
V
OUT
V
Lx
V
CE
V
DD
I
LX
CMOS IC
RATINGS
UNIT
12
V
12
V
12
V
12
V
400
mA
SOT-89
500
mW
Power Dissipation
P
D
SOT-25
250
mW
Operating Junction Temperature
T
J
+125
°C
Ambient Operating Temperature
T
OPR
-30 ~ +80
°C
Storage Temperature
T
STG
-40 ~ +125
°C
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
(T
A
=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
. F
OSC
>F
OSC
1×2
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
F
OSC
1 Same as I
DD1
. 75% duty
Maximum Oscillation Frequency
F
OSC
2 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,J
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
. F
OSC
>F
OSC
1×2
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
F
OSC
1 Same as I
DD1
. 75% duty
Maximum Oscillation Frequency
F
OSC
2 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
. F
OSC
>F
OSC
1×2
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
F
OSC
1 Same as I
DD1
. 75% duty
Maximum Oscillation Frequency
F
OSC
2 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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