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UNISONIC TECHNOLOGIES CO., LTD UC3500
HIGH EFFICIENCY VFM CONTROLLED STEP-UP DC/DC CONVERTER
APPLICATIONS
* Cellular telephones * PDA and hand held instruments * Palmtop and notebook computer * Portable equipment * Battery powered equipment
1 3 2 1
CMOS IC
5 4
SOT-25
SOT-89
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 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 18A. *Pb-free plating product number: UC3500L
FEATURES
* 0.8V start-up voltage * 0.5V hold-on voltage * Output current up to 150mA * Low supply current of 18A * 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 Normal Lead Free Plating UC3500-xx-AB3-R UC3500L-xx-AB3-R UC3500-xx-AF5-R UC3500L-xx-AF5-R Package SOT-89 SOT-25 Packing 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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MARKING INFORMATION
PACKAGE VOLTAGE CODE
3
CMOS IC
MARKING
2 1
SOT-25 25:2.5V 28:2.8V 30:3.0V 33:3.3V 50:5.0V SOT-89
U3XX
Voltage Code 4 5 Lead Plating
Date Code
UC3XX
1 2 3
Lead Plating Voltage Code
PIN CONFIGURATION
OUT GND 3 2 LX 1
4 NC
5 NC
1
2
3
LX
GND OUT
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BLOCK DIAGRAM
CMOS IC
OUT OUT OSCILLATOR ERROR AMPLIFIER VFM CONTROL LX
VREF VIX LIMITER
GND
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ABSOLUTE MAXIMUM RATING
PARAMETER SYMBOL VOUT VIN VLX ILX
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 25 160 mW SOT-25 PD Derating Rate at Ta=25C /mW 1.6 Operating Junction Temperature TOPR -25 ~ +85 Storage Temperature TSTG -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 Output Voltage
Start-up Voltage (VIN-VF) (Note 1) Hold-on Voltage Supply Current Internal Switch RDS(ON) Internal Leakage Current Maximum Oscillator Frequency Oscillator Duty Cycle Efficiency SYMBOL VOUT VSTART VHOLD ISUPPLY RLX ILX(LEAK) fOSC Dty TEST CONDITIONS IOUT = 10mA IOUT = 0 IOUT = 1mA IOUT = 0 IOUT = 1mA IOUT = 0 ILX = 100mA VLX = 4V, VOUT = 2.8V IOUT = 10mA IOUT = 10mA IOUT = 10mA IOUT = 50mA IOUT = 100mA MIN 2.4 TYP 2.5 0.7 0.8 0.6 0.5 18 760 0.1 300 75 81 83 82 MAX 2.6 1.1 1.2 UNIT V V V V V A m A KHz % % % %
0.4 0.3
240
0.3 360
Note 1: VF references to the forward voltage of the diode.
UC3500-2.8V (VIN = 1.6V) PARAMETER Output Voltage
Start-up Voltage (VIN-VF) Hold-on Voltage Supply Current Internal Switch RDS(ON) Internal Leakage Current Maximum Oscillator Frequency Oscillator Duty Cycle Efficiency
SYMBOL VOUT VSTART VHOLD ISUPPLY RLX ILX(LEAK) fOSC Dty
TEST CONDITIONS IOUT = 10mA IOUT = 0 IOUT = 1mA IOUT = 0 IOUT = 1mA IOUT = 0 ILX = 100mA VLX = 4V, VOUT = 3.1V IOUT = 10mA IOUT = 10mA IOUT = 10mA IOUT = 50mA IOUT = 100mA
MIN 2.7
0.4 0.3
240
TYP 2.8 0.7 0.8 0.6 0.5 18 760 0.1 300 75 82 83 82
MAX 2.9 1.1 1.2
0.3 360
UNIT V V V V V A m A KHz % % % %
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ELECTRICAL CHARACTERISTICS(Cont.)
UC3500-3.0V (VIN = 1.8V) PARAMETER Output Voltage
Start-up Voltage (VIN-VF) Hold-on Voltage Supply Current Internal Switch RDS(ON) Internal Leakage Current Maximum Oscillator Frequency Oscillator Duty Cycle Efficiency SYMBOL VOUT VSTART VHOLD ISUPPLY RLX ILX(LEAK) fOSC Dty TEST CONDITIONS IOUT = 10mA IOUT = 0 IOUT = 1mA IOUT = 0 IOUT = 1mA IOUT = 0 ILX = 100mA VLX = 4V, VOUT = 3.3V IOUT = 10mA IOUT = 10mA IOUT = 10mA IOUT = 50mA IOUT = 100mA MIN 2.9 TYP 3 0.7 0.8 0.6 0.5 18 750 0.1 300 75 82 84 82
CMOS IC
MAX 3.1 1.1 1.2
0.4 0.3
240
0.3 360
UNIT V V V V V A m A KHz % % % %
UC3500-3.3V (VIN = 2.0V) PARAMETER Output Voltage
Start-up Voltage (VIN-VF) Hold-on Voltage Supply Current Internal Switch RDS(ON) Internal Leakage Current Maximum Oscillator Frequency Oscillator Duty Cycle Efficiency
SYMBOL VOUT VSTART VHOLD ISUPPLY RLX ILX(LEAK) fOSC Dty
TEST CONDITIONS IOUT = 10mA IOUT = 0 IOUT = 1mA IOUT = 0 IOUT = 1mA IOUT = 0 ILX = 100mA VLX = 4V, VOUT = 3.6V IOUT = 10mA IOUT = 10mA IOUT = 10mA IOUT = 50mA IOUT = 100mA
MIN 3.2
0.4 0.3
240
TYP 3.3 0.7 0.8 0.6 0.5 18 750 0.1 300 75 83 85 84
MAX 3.4 1.1 1.2
0.3 360
UNIT V V V V V A m A KHz % % % %
UC3500-5.0V (VIN = 3.0V) PARAMETER Output Voltage
Start-up Voltage (VIN-VF) Hold-on Voltage Supply Current Internal Switch RDS(ON) Internal Leakage Current Maximum Oscillator Frequency Oscillator Duty Cycle Efficiency
SYMBOL VOUT VSTART VHOLD ISUPPLY RLX ILX(LEAK) fOSC Dty
TEST CONDITIONS IOUT = 10mA IOUT = 0 IOUT = 1mA IOUT = 0 IOUT = 1mA IOUT = 0 ILX = 100mA VLX = 4V, VOUT = 5.3V IOUT = 10mA IOUT = 10mA IOUT = 10mA IOUT = 50mA IOUT = 100mA
MIN 4.85
0.4 0.3
240
TYP 5.0 0.7 0.8 0.6 0.5 19 730 0.1 300 75 86 88 85
MAX 5.15 1.1 1.2
0.3 360
UNIT V V V V V A m A KHz % % % %
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PRINCIPLE OF OPERATION
CMOS IC
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 2.5s. 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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TYPICAL APPLICATION CIRCUIT
D
CMOS IC
5 VIN L=47H NC LX 1
4 NC GND OUT 2 3 VOUT
CIN=4.7F
C OUT=47F
RECONMMENDED COMPONENTS
L D CIN COUT
47H (Sunida CD54 Fosc MA737, or MBRM110L 10V 4.7F (Tantalum) 16V 47F (Tantalum) 500kHz)
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TYPICAL CHARACTERISTICS
Output Voltage vs. Temperature 7.0 6.0 5.0 4.0 3.0 2.0 1.0 -40 -20 0 VOUT=3.0 IOUT=50mA VIN=1.8V 20 40 60 80 100 ) 90
Efficiency, (%)
CMOS IC
Efficiency vs. Temperature VOUT=5.0 IOUT=50mA VIN=3V
Output Voltage, VOUT (V)
VOUT=5.0 IOUT=50mA VIN=3V
85 80 75 70 65 60 -40 -20 0 20 40 60 80 100 ) VOUT=3.0 IOUT=50mA VIN=1.8V
Junction Temperature, T J (
Junction Temperature, T J (
Start-up Voltage (VIN - VF) vs. Temperature Start-up Voltage, VSTART (V) 0.90 0.85 0.80 0.75 0.70 0.65 0.60 -40 -20 0 20 40 60 80 100 ) VOUT=3.0 IOUT=1mA Start-up Voltage, VSTART (V)
Start-up Voltage (VIN - VF ) vs. Output Current
VOUT=5.0 IOUT=1mA
1.50 1.25 1.00 0.75 0.50 0.1 VOUT=5.0 VOUT=3.0
Junction Tempetature, TJ (
1 10 Output Current, IOUT (mA)
Internal Switch RDS(ON) vs. Temperature
Internal Switch, RLX(ON) ()
Hold-on Voltage vs . Temperature
Hold-on Voltage, VHOLD (V)
0.9 0.8 0.7 0.6 0.5 0.4
VOUT=5.0 ILX =150mA VIN=3V
0.6 0.5 0.4 0.3 0.2 0.1 0 -40
VOUT=5.0 I OUT=1mA
VOUT=3.0 ILX=150mA VIN=1.8V
VOUT=3.0 I OUT=1mA
0.3 -40 -20 0
20
40 60
80 100
-20 0
20
40
60
80 100
Junction Temperature TJ ( ) ,
Junction Temperature, TJ ( )
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UC3500
TYPICAL CHARACTERISTICS(Cont.)
CMOS IC
Output Voltage vs. Output Current 6 5 4 3 2 1 0 0 VOUT=5.0 50 100 150 200 250 300 350 Output Current, IOUT (mA)
Efficiency vs. Output Current 90 90
Output Voltage vs. Output Current 3.0 2.5 2.0 1.5 1.0 0.5 0 0 VOUT=3.0 50 100 150 200 250 300 350 Output Current, IOUT (mA)
Efficiency vs. Output Current
Output Voltage, VOUT (V)
Output Voltage, VOUT (V)
3V 1V 2V
2V 1V 1.5V
Efficiency, (%)
80 70 60 50 40 0 VOUT=5.0 50 1V 2V
Efficiency, (%)
3V
80 70 60 50 VOUT=3.0 0 50 100 150 200 250 2V 1V 1.5V
100 150 200 250
300
40
Output Current, IOUT (mA)
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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