UNISONIC TECHNOLOGIES CO., LTD
UC3380
PWM STEP UP DC-DC
CONTROLLER
DESCRIPTION
The
UC3380
is PWM step up DC-DC switching controller that
operates from 0.9V. The low start up input voltage makes UC3380
specially designed for powering portable equipment from one or two
cells battery packs. This device consist of a soft start circuit, a reference
voltage source, an error amplifier, an oscillator, a phase compensation,
a PWM controller and an output drive circuit for driving external power
transistor.
Additionally, a chip enable feature is provided to power down the
converter for extended battery life. The device features a voltage mode
PWM control loop, providing stable and high efficiency operation over a
broad load current range.
CMOS IC
FEATURES
* 0.9V Low Start-Up Input Voltage at 1mA Load
* Low Operation Current
* 0.5uA Low Shutdown Current
* Fix Frequency PWM at 300KHZ
* Built in PWM Switching Control Circuit ,Duty Ratio is 0~78%
* Output Voltage:0.1V Step Setting is Available Between 2.0V and 6.5V
* Soft Start Time: 3ms
* Shutdown Function
APPLICATIONS
*Portable Devices
*Electronic Games
*Portable Audio (MP3)
*Personal Digital Assistant (PDA)
*Digital still Cameras(DSC)
*Camcorders
*White LED Driver
*Single and Dual-Cell Battery Operated Products
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
UC3380L-xx-AF5-R
UC3380G-xx-AF5-R
Package
SOT-25
Packing
Tape Reel
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QW-R502-099.D
UC3380
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
18:1.8V
21:2.1V
25:2.5V
27:2.7V
30:3.0V
33:3.3V
40:4.0V
50:5.0V
MARKING
CMOS IC
SOT-25
PIN DESCRIPTION
PIN NO
1
2
3
4
5
NAME
SHUTDOWN
V
OUT
NC
V
SS
EXT
DESCRIPTION
Shutdown control input, “H” : normal operation
“L” : stop step up( whole circuit stop).
Power supply and voltage output.
No connection.
Ground.
Switching the circuit by connecting to a transistor.
BLOCK DIAGRAM
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UC3380
ABSOLUTE MAXIMUM RATINGS
CMOS IC
PARAMETER
SYMBOL
RATINGS
UNIT
V
OUT
Pin Voltage
V
OUT
12
V
SHUTDOWN Pin Voltage
V
SHUTDOWN
V
SS
-0.3~12
V
EXT Pin Voltage
V
EXT
-0.3~ V
OUT
+0.3
V
EXT Pin Current
I
EXT
±80
mA
Power Dissipation
P
D
250
mW
Operating Ambient Temperature
T
OPR
-40~+85
°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 CHARACTERISTICS
Refer to the test circuit, T
OPR
=25°C, V
IN
=V
OUT
(S)*0.6, I
OUT
=V
OUT
(S)/50Ω, unless otherwise specified.
TEST
TEST CONDITION
MIN
TYP
PARAMETER
SYMBOL
CIRCUIT
TOTAL DEVICE
V
OUT
V
OUT
Output Voltage
V
OUT
2
(S)
(S)*0.976
V
OUT
(S)15 to 19
33.8
V
OUT
(S)20 to 29
50.3
V
OUT
(S)30 to 39
68.6
V
OUT
=
Supply Current 1
I
S1
1
V
OUT
(S)*0.95 V
OUT
(S)40 to 49
88.4
V
OUT
(S)50 to 59
109.4
V
OUT
(S)60 to 65
131.6
V
OUT
(S)15 to 19
9.7
V
OUT
(S)20 to 29
9.9
V
OUT
(S)30 to 39
10.0
V
OUT
=
Supply Current 2
I
S2
1
V
IN
(S)+0.5V
V
OUT
(S)40 to 49
10.2
V
OUT
(S)50 to 59
10.4
V
OUT
(S)60 to 65
10.5
Input Voltage
V
IN
2
Measured by decreasing V
IN
Operation Holding Voltage V
HOLD
2
voltage gradually, when
0.7
I
OUT
=1mA.
Operation Start Voltage
V
ST1
2
I
OUT
=1mA
Increase the V
IN
until EXT pin
Oscillation Start Voltage
V
ST2
1
output the oscillating signal
Oscillation Frequency
f
OSC
1
V
OUT
=V
OUT
(S)*0.95
255
300
Duty Ratio
Duty
1
V
OUT
=V
OUT
(S)*0.95
70
78
⊿LNR
Line Regulation
2
VIN=V
OUT
(S)*0.4 to *0.6
30
⊿LDR
Load Regulation
2
I
OUT
=10uA to V
OUT
(S)/50*1.25
30
⊿V
OUT
/(⊿T
OPR
*V
OUT
)
±50
Temperature Coefficient
E
T
2
T
OPR
=-40°C ~ +85°C
Efficiency
E
F
2
85
Soft Start time
Ts
2
1.5
3.0
MAX
UNIT
V
OUT
(S)*1.024
V
56.4
83.9
114.4
147.4
182.4
219.3
19.4
19.7
20.0
20.4
20.7
21.0
10
uA
uA
V
V
0.9
0.8
345
85
60
60
V
V
KHz
%
mV
mV
ppm/°C
6.0
%
ms
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QW-R502-099.D
UC3380
ELECTRICAL CHARACTERISTICS
PARAMETER
SHUTDOWN
Shutdown Supply Current
Shutdown Pin Input
Current
Shutdown Pin Input
Voltage Threshold
EXT
V
OUT
(S)15 to 19
V
OUT
(S)20 to 24
V
OUT
(S)25 to 29
V
EXT
=
1
V
OUT
(S)30 to 39
I
EXTH
V
OUT
(S) -0.4V
V
OUT
(S)40 to 49
V
OUT
(S)50 to 59
V
OUT
(S)60 to 65
EXT Pin Current
V
OUT
(S)15 to 19
V
OUT
(S)20 to 24
V
OUT
(S)25 to 29
I
EXTL
1
V
EXT
= 0.4V
V
OUT
(S)30 to 39
V
OUT
(S)40 to 49
V
OUT
(S)50 to 59
V
OUT
(S)60 to 65
Note: V
OUT
(S) is the value of the set output voltage.
-4.5
-6.2
-7.8
-10.3
-13.3
-16.1
-18.9
9.5
12.6
15.5
19.2
23.8
27.4
30.3
-8.9
-12.3
-15.7
-20.7
-26.7
-32.3
-37.7
19.0
25.2
31.0
38.5
47.6
54.8
60.6
SYMBOL
I
SS
I
SH
I
SL
V
IH
V
IL1
V
IL2
1
TEST
CIRCUIT
1
1
TEST CONDITION
V
SHUTDOWN
=0
V
SHUTDOWN
=V
OUT
(S)*0.95
V
SHUTDOWN
=0
Shutdown pin “L” to “H” until EXT
output oscillating signal
Shutdown pin “H” to V
OUT
≥1.5V
“L” until EXT output
V
OUT
<1.5V
oscillating signal
MIN
TYP
CMOS IC
MAX
0.5
0.1
-0.1
UNIT
uA
uA
uA
V
0.75
0.3
0.2
V
V
mA
mA
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