UNISONIC TECHNOLOGIES CO., LTD
UC3500
HIGH EFFICIENCY VFM
CONTROLLED STEP-UP
DC/DC CONVERTER
DESCRIPTION
The UTC
UC3500
Step-up DC/DC converters are optimized
for applications that prioritize high efficiency and high frequency.
The efficiency is greatly improved by utilizing an internal VFM
controlled scheme that switches with fixed frequency and is
adjustable up to more than 150 KHz depending on the load.
The UTC
UC3500
requires only three external components
to realize the conversion from the battery voltage to the selected
output voltage in the range of 2.5V ~ 5.5V.
The start-up voltage of UTC
UC3500
is guaranteed at 0.8V
and the device is operating down to 0.5V. The Output current is
guaranteed up to 150mA, while quiescent current is only 18μA.
CMOS IC
FEATURES
* 0.8V start-up voltage
* 0.5V hold-on voltage
* Output current up to 150mA
* Low supply current of 18μA
* Wide output voltage range of 2.5V~5.5V
* Output voltage accuracy ±2%
* High efficiency up to 88%
* Low profile and minimum external components
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
UC3500L-xx-AB3-R
UC3500G-xx-AB3-R
UC3500L-xx-AE3-R
UC3500G-xx-AE3-R
UC3500L-xx-AF5-R
UC3500G-xx-AF5-R
Package
SOT-89
SOT-23
SOT-25
Packing
Tape Reel
Tape Reel
Tape Reel
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QW-R502-072,D
UC3500
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
V
OUT
V
IN
V
LX
I
LX
CMOS IC
RATINGS
UNIT
Output Voltage
7
V
Input Voltage
7
V
LX Pin Voltage
7
V
LX Pin Output Current
Internally limited
Power Dissipation at 25°С
160
mW
SOT-23/SOT-25
P
D
Derating Rate Ta>25°С
1.6
°С/mW
Operating Junction Temperature
T
OPR
-25 ~ +85
°С
Storage Temperature
T
STG
-65 ~ +150
°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.
ELECTRICAL CHARACTERISTICS
(Ta = 25°С, unless otherwise specified.)
UC3500-2.5V
(V
IN
= 1.4V)
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
UC3500-2.7V
(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
SYMBOL
V
OUT
V
START
V
HOLD
I
SUPPLY
R
LX
I
LX(LEAK)
f
OSC
D
ty
η
TEST CONDITIONS
I
OUT
= 10mA
I
OUT
= 0
I
OUT
= 1mA
I
OUT
= 0
I
OUT
= 1mA
I
OUT
= 0
I
LX
= 100mA
V
LX
= 4V, V
OUT
= 2.8V
I
OUT
= 10mA
I
OUT
= 10mA
I
OUT
= 10mA
I
OUT
= 50mA
I
OUT
= 100mA
TEST CONDITIONS
I
OUT
= 10mA
I
OUT
= 0
I
OUT
= 1mA
I
OUT
= 0
I
OUT
= 1mA
I
OUT
= 0
I
LX
= 100mA
V
LX
= 4V, V
OUT
= 3.0V
I
OUT
= 10mA
I
OUT
= 10mA
I
OUT
= 10mA
I
OUT
= 50mA
I
OUT
= 100mA
MIN
2.4
TYP
2.5
0.7
0.8
0.6
0.5
18
760
0.1
150
75
81
83
82
TYP
2.7
0.7
0.8
0.6
0.5
18
760
0.1
150
75
82
83
82
MAX
2.6
1.1
1.2
UNIT
V
V
V
V
V
µA
mΩ
µA
KHz
%
%
%
%
UNIT
V
V
V
V
V
µA
mΩ
µA
KHz
%
%
%
%
0.4
0.3
0.3
SYMBOL
V
OUT
V
START
V
HOLD
I
SUPPLY
R
LX
I
LX(LEAK)
f
OSC
D
ty
η
MIN
2.6
MAX
2.8
1.1
1.2
0.4
0.3
0.3
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QW-R502-072.D
UC3500
ELECTRICAL CHARACTERISTICS(Cont.)
UC3500-2.8V
(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
UC3500-3.0V
(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
UC3500-3.3V
(V
IN
= 2.0V)
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
SYMBOL
V
OUT
V
START
V
HOLD
I
SUPPLY
R
LX
I
LX(LEAK)
f
OSC
D
ty
η
TEST CONDITIONS
I
OUT
= 10mA
I
OUT
= 0
I
OUT
= 1mA
I
OUT
= 0
I
OUT
= 1mA
I
OUT
= 0
I
LX
= 100mA
V
LX
= 4V, V
OUT
= 3.1V
I
OUT
= 10mA
I
OUT
= 10mA
I
OUT
= 10mA
I
OUT
= 50mA
I
OUT
= 100mA
TEST CONDITIONS
I
OUT
= 10mA
I
OUT
= 0
I
OUT
= 1mA
I
OUT
= 0
I
OUT
= 1mA
I
OUT
= 0
I
LX
= 100mA
V
LX
= 4V, V
OUT
= 3.3V
I
OUT
= 10mA
I
OUT
= 10mA
I
OUT
= 10mA
I
OUT
= 50mA
I
OUT
= 100mA
TEST CONDITIONS
I
OUT
= 10mA
I
OUT
= 0
I
OUT
= 1mA
I
OUT
= 0
I
OUT
= 1mA
I
OUT
= 0
I
LX
= 100mA
V
LX
= 4V, V
OUT
= 3.6V
I
OUT
= 10mA
I
OUT
= 10mA
I
OUT
= 10mA
I
OUT
= 50mA
I
OUT
= 100mA
MIN
2.7
TYP
2.8
0.7
0.8
0.6
0.5
18
760
0.1
150
75
82
83
82
TYP
3
0.7
0.8
0.6
0.5
18
750
0.1
150
75
82
84
82
TYP
3.3
0.7
0.8
0.6
0.5
18
750
0.1
150
75
83
85
84
CMOS IC
MAX
2.9
1.1
1.2
0.4
0.3
0.3
UNIT
V
V
V
V
V
µA
mΩ
µA
KHz
%
%
%
%
UNIT
V
V
V
V
V
µA
mΩ
µA
KHz
%
%
%
%
UNIT
V
V
V
V
V
µA
mΩ
µA
KHz
%
%
%
%
SYMBOL
V
OUT
V
START
V
HOLD
I
SUPPLY
R
LX
I
LX(LEAK)
f
OSC
D
ty
η
MIN
2.9
MAX
3.1
1.1
1.2
0.4
0.3
0.3
SYMBOL
V
OUT
V
START
V
HOLD
I
SUPPLY
R
LX
I
LX(LEAK)
f
OSC
D
ty
η
MIN
3.2
MAX
3.4
1.1
1.2
0.4
0.3
0.3
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QW-R502-072.D
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