UC3500 [UTC]
HIGH EFFICIENCY VFM CONTROLLED STEP-UP DC/DC CONVERTER; 高效率VFM控制的升压型DC / DC转换器
| 型号： | UC3500 |
| 厂家： | 
Unisonic Technologies |
| 描述： | HIGH EFFICIENCY VFM CONTROLLED STEP-UP DC/DC CONVERTER |
| 文件： | 总9页 (文件大小：144K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UNISONIC TECHNOLOGIES CO., LTD
UC3500
CMOS IC
HIGH EFFICIENCY VFM
CONTROLLED STEP-UP
DC/DC CONVERTER
1
2
3
5
4
SOT-25
ꢀ
APPLICATIONS
1
* Cellular telephones
* PDA and hand held instruments
* Palmtop and notebook computer
* Portable equipment
* Battery powered equipment
SOT-89
ꢀ
DESCRIPTION
The UTC UC3500 Step-up DC/DC converters are optimized for
*Pb-free plating product number: UC3500L
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 300 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.
ꢀ
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
Order Number
Package
Packing
Normal
Lead Free Plating
UC3500-xx-AB3-R
UC3500-xx-AF5-R
UC3500L-xx-AB3-R
UC3500L-xx-AF5-R
SOT-89
SOT-25
Tape Reel
Tape Reel
UC3550L-xx-AB3-R
(1)Packing Type
(2)Package Type
(3)Voltage Code
(4)Lead Plating
(1) R: Tape Reel
(2) AB3: SOT-89, AF5: SOT-25
(3) xx: reference to Marking Information
(4) L: Lead Free Plating, Blank: Pb/Sn
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Copyright © 2005 Unisonic Technologies Co., Ltd
QW-R502-072,A
UC3500
CMOS IC
ꢀ
MARKING INFORMATION
PACKAGE VOLTAGE CODE
MARKING
3
2
1
U3XX
SOT-25
Voltage Code
Lead Plating
25:2.5V
28:2.8V
30:3.0V
33:3.3V
50:5.0V
4
5
Date Code
Lead Plating
Voltage Code
SOT-89
UC3XX
1
2
3
ꢀ
PIN CONFIGURATION
OUT GND LX
3
2
1
4
5
1
2
3
NC
NC
LX GND OUT
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UC3500
CMOS IC
ꢀ
BLOCK DIAGRAM
OUT
OUT
LX
OSCILLATOR
ERROR
AMPLIFIER
VFM
CONTROL
VREF
VIX LIMITER
GND
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UC3500
CMOS IC
ꢀ
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
VOUT
VIN
RATINGS
UNIT
Output Voltage
Input Voltage
7
V
V
V
7
7
LX Pin Voltage
LX Pin Output Current
VLX
ILX
Internally limited
160
Power Dissipation at 25
℃
mW
SOT-25
PD
Derating Rate at Ta=25
°
C
1.6
℃/mW
Operating Junction Temperature
Storage Temperature
TOPR
TSTG
-25 ~ +85
-65 ~ +150
℃
℃
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℃, unless otherwise specified.)
UC3500-2.5V (VIN = 1.4V)
PARAMETER
SYMBOL
VOUT
TEST CONDITIONS
IOUT = 10mA
IOUT = 0
MIN
2.4
TYP
2.5
0.7
0.8
0.6
0.5
18
MAX
2.6
UNIT
V
Output Voltage
1.1
V
Start-up Voltage (VIN-VF) (Note 1)
Hold-on Voltage
VSTART
VHOLD
ISUPPLY
IOUT = 1mA
1.2
V
IOUT = 0
0.4
0.3
V
IOUT = 1mA
V
Supply Current
Internal Switch RDS(ON)
Internal Leakage Current
Maximum Oscillator Frequency
Oscillator Duty Cycle
IOUT = 0
µA
RLX
ILX(LEAK)
fOSC
ILX = 100mA
VLX = 4V, VOUT = 2.8V
IOUT = 10mA
IOUT = 10mA
IOUT = 10mA
IOUT = 50mA
IOUT = 100mA
760
0.1
300
75
mΩ
0.3
µA
KHz
%
240
360
Dty
81
%
ꢀη
Efficiency
83
%
82
%
Note 1: VF references to the forward voltage of the diode.
UC3500-2.8V (VIN = 1.6V)
PARAMETER
Output Voltage
SYMBOL
VOUT
TEST CONDITIONS
IOUT = 10mA
MIN
2.7
TYP
2.8
0.7
0.8
0.6
0.5
18
MAX
2.9
UNIT
V
IOUT = 0
1.1
V
Start-up Voltage (VIN-VF)
Hold-on Voltage
VSTART
I
OUT = 1mA
IOUT = 0
1.2
V
0.4
0.3
V
VHOLD
ISUPPLY
RLX
IOUT = 1mA
IOUT = 0
V
Supply Current
Internal Switch RDS(ON)
Internal Leakage Current
Maximum Oscillator Frequency
Oscillator Duty Cycle
µA
ILX = 100mA
760
0.1
300
75
mΩ
ILX(LEAK)
fOSC
VLX = 4V, VOUT = 3.1V
IOUT = 10mA
IOUT = 10mA
IOUT = 10mA
IOUT = 50mA
IOUT = 100mA
0.3
µA
KHz
%
240
360
Dty
82
%
ꢀη
Efficiency
83
%
82
%
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UC3500
CMOS IC
ꢀ
ELECTRICAL CHARACTERISTICS(Cont.)
UC3500-3.0V (VIN = 1.8V)
PARAMETER
SYMBOL
VOUT
TEST CONDITIONS
IOUT = 10mA
IOUT = 0
MIN
2.9
TYP
3
MAX
3.1
UNIT
V
Output Voltage
0.7
0.8
0.6
0.5
18
1.1
V
Start-up Voltage (VIN-VF)
Hold-on Voltage
VSTART
VHOLD
ISUPPLY
IOUT = 1mA
1.2
V
IOUT = 0
0.4
0.3
V
IOUT = 1mA
V
Supply Current
Internal Switch RDS(ON)
Internal Leakage Current
Maximum Oscillator Frequency
Oscillator Duty Cycle
IOUT = 0
µA
RLX
ILX(LEAK)
fOSC
ILX = 100mA
VLX = 4V, VOUT = 3.3V
IOUT = 10mA
IOUT = 10mA
IOUT = 10mA
IOUT = 50mA
IOUT = 100mA
750
0.1
300
75
mΩ
0.3
µA
KHz
%
240
360
Dty
82
%
ꢀη
Efficiency
84
%
82
%
UC3500-3.3V (VIN = 2.0V)
PARAMETER
SYMBOL
VOUT
TEST CONDITIONS
IOUT = 10mA
IOUT = 0
MIN
3.2
TYP
3.3
0.7
0.8
0.6
0.5
18
MAX
3.4
UNIT
V
Output Voltage
1.1
V
Start-up Voltage (VIN-VF)
Hold-on Voltage
VSTART
IOUT = 1mA
1.2
V
IOUT = 0
0.4
0.3
V
VHOLD
ISUPPLY
RLX
IOUT = 1mA
V
Supply Current
Internal Switch RDS(ON)
Internal Leakage Current
Maximum Oscillator Frequency
Oscillator Duty Cycle
IOUT = 0
µA
ILX = 100mA
VLX = 4V, VOUT = 3.6V
IOUT = 10mA
IOUT = 10mA
IOUT = 10mA
IOUT = 50mA
IOUT = 100mA
750
0.1
300
75
mΩ
ILX(LEAK)
fOSC
0.3
µA
KHz
%
240
360
Dty
83
%
ꢀη
Efficiency
85
%
84
%
UC3500-5.0V (VIN = 3.0V)
PARAMETER
SYMBOL
VOUT
TEST CONDITIONS
IOUT = 10mA
IOUT = 0
MIN
4.85
TYP
5.0
0.7
0.8
0.6
0.5
19
MAX
5.15
1.1
UNIT
V
Output Voltage
V
Start-up Voltage (VIN-VF)
Hold-on Voltage
VSTART
VHOLD
ISUPPLY
IOUT = 1mA
1.2
V
IOUT = 0
0.4
0.3
V
IOUT = 1mA
V
Supply Current
Internal Switch RDS(ON)
Internal Leakage Current
Maximum Oscillator Frequency
Oscillator Duty Cycle
IOUT = 0
µA
RLX
ILX(LEAK)
fOSC
ILX = 100mA
VLX = 4V, VOUT = 5.3V
IOUT = 10mA
IOUT = 10mA
IOUT = 10mA
IOUT = 50mA
730
0.1
300
75
mΩ
0.3
µA
KHz
%
240
360
Dty
86
%
ꢀη
Efficiency
88
%
I
OUT = 100mA
85
%
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UC3500
CMOS IC
ꢀ
PRINCIPLE OF OPERATION
The UTC UC3500 consists of a Band-Gap reference voltage source, error amplifier, VFM control logic core,
oscillator, VLX limiter amplifier, N-channel MOSFET switching transistor and output voltage divider network.
The device compares the Band-Gap reference voltage with the feedback voltage from the output through divider
network. In TON phase, the energy is transferred from the battery to the inductor. The switch is turned off after a
maximum on time set to 2.5µs. In TOFF phase, the energy stored in the inductor is transferred to the load. This
process is continuously performed to ensure stable output voltage. Until the output voltage reaches the expected
value.
Therefore, in case of light load, the device works in PFM mode. In heavy load condition, the device works in
continuous mode, the frequency range up to a maximum 300 KHz set by the built in oscillator. In over current
conditions, the Ton time is shorted; the switching frequency will be higher than 300 KHz.
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UC3500
CMOS IC
ꢀ
TYPICAL APPLICATION CIRCUIT
D
5
4
L=47µH
NC
NC
VIN
VOUT
OUT
3
LX GND
1
2
COUT=47µF
CIN=4.7µF
ꢀ
RECONMMENDED COMPONENTS
L
D
CIN
COUT
：
47
MA737, or MBRM110L
10V 4.7 F (Tantalum)
16V 47 F (Tantalum)
µH (Sunida CD54 Fosc＝500kHz)
：
：
µ
µ
：
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UC3500
CMOS IC
ꢀ
TYPICAL CHARACTERISTICS
Output Voltage vs. Temperature
Efficiency vs. Temperature
VOUT=5.0
IOUT=50mA VIN=3V
90
85
7.0
6.0
VOUT=5.0
IOUT=50mA
VIN=3V
80
5.0
VOUT=3.0
IOUT=50mA VIN=1.8V
75
70
65
60
4.0
3.0
2.0
VOUT=3.0
OUT=50mA
VIN=1.8V
I
1.0
-40 -20
0
20 40 60 80 100
-40 -20
0
20 40 60 80 100
Junction Temperature, TJ (℃)
Junction Temperature, TJ (℃)
Start-up Voltage
Start-up Voltage
(VIN - VF) vs. Temperature
(V - VF) vs. Output Current
IN
0.90
0.85
VOUT=5.0
1.50
1.25
IOUT=1mA
VOUT=3.0
VOUT=5.0
0.80
0.75
0.70
0.65
0.60
1.00
VOUT=3.0
OUT=1mA
I
0.75
0.50
-40 -20 0 20 40 60
80 100
0.1
1
10
Junction Tempetature, TJ (℃)
Output Current, IOUT (mA)
Internal Switch RDS(ON) vs.
Temperature
Hold-on Voltage vs.
Temperature
VOUT=5.0
ILX=150mA
VIN=3V
0.6
0.5
VOUT=5.0
0.9
0.8
I
OUT=1mA
0.4
0.7
0.6
VOUT=3.0
ILX=150mA
VIN=1.8V
0.3
0.2
0.1
VOUT=3.0
IOUT=1mA
0.5
0.4
0.3
0
-40 -20
0
20 40 60 80 100
-40 -20
0
20 40 60 80 100
Junction Temperature, TJ (℃)
Junction Temperature, TJ (℃)
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UC3500
CMOS IC
ꢀ
TYPICAL CHARACTERISTICS(Cont.)
Output Voltage vs. Output Current
Output Voltage vs. Output Current
6
5
3.0
2.5
2V
3V
1V
1.5V
4
2.0
1V
2V
3
2
1
0
1.5
1.0
0.5
0
VOUT=5.0
VOUT=3.0
0
50 100 150 200 250 300 350
Output Current, IOUT (mA)
0
50 100 150 200 250 300 350
Output Current, IOUT (mA)
Efficiency vs. Output Current
Efficiency vs. Output Current
90
80
90
80
3V
2V
1V
2V
70
60
70
60
1V
1.5V
50
40
50
40
VOUT=5.0
VOUT=3.0
0
50 100 150 200 250 300
Output Current, IOUT (mA)
0
50 100
150 200
250
Output Current, IOUT (mA)
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
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