UNISONIC TECHNOLOGIES CO., LTD UC8383
STEP-UP DC/DC CONVERTER
DESCRIPTION
The UTC UC8383 is a high efficiency VFM controlled step-up DC/DC converter. The UTC UC8383 is designed to have low start up voltage and low quiescent current: The UTC UC8383 can realize the conversion from the input voltage to the selected output voltage (2.5V ~ 5.0V) only using an inductor, a diode and an output capacitor. Its typical applications include: cellular telephones, pagers, video camera, PDA and hand held instruments, palmtop, notebook computer, portable equipment and battery powered equipment.
CMOS IC
FEATURES
* 0.8V Start-Up Voltage * Low Supply Current of Typical be18μA * Wide Output Voltage Range of 2.5V~5.0V * Output Voltage Accuracy ±2% * Output Current Up to 100mA * Low Ripple and Low Noise * High Efficiency Up to 85% * Low Profile and Minimum External Components
ORDERING INFORMATION
Ordering Number Lead Free Halogen Free UC8383L-xx-AB3-R UC8383G-xx-AB3-R Package SOT-89 Pin Assignment 1 2 3 VSS VOUT LX Packing Tape Reel
UC8383L-xx-AB3-R
(1)Packing Type (2)Package Type (3)Voltage Code (4)Lead Free
(1) R: Tape Reel (2) AB3: SOT-89 (3) xx: refer to Marking Information (4) G: Halogen Free, L: Lead Free
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UC8383
MARKING INFORMATION
PACKAGE VOLTAGE CODE 25:2.5V 27:2.7V 28:2.8V 30:3.0V 33:3.3V 36:3.6V 50:5.0V MARKING
Voltage Code Date Code
CMOS IC
SOT-89
UC8383 1 2 3
L: Lead Free G: Halogen Free
PIN DESCRIPTION
PIN NO 1 2 3 PIN NAME VSS VOUT LX DESCRIPTION GND. Output voltage monitor, IC internal supply voltage Switch pin
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UC8383
BLOCK DIAGRAM
CMOS IC
OUT
LX
VIX Limiter
VFM Control
VREF
Error Amplifier
Oscillator
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UC8383
ABSOLUTE MAXIMUM RATING
PARAMETER Output Voltage Input Voltage LX Pin Voltage LX Pin Output Current Power Dissipation (Ta=25°С) Derating Rate over Ta=25°C SYMBOL VOUT VIN VLX ILX
CMOS IC
RATINGS UNIT 5.5 V 5.5 V 5.5 V Internally limited 170 mW PD 1.7 °С/mW Operating Junction Temperature TJ -25 ~ +85 °С Storage Temperature TSTG -55 ~ +125 °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.
THERMAL DATA
PARAMETER Junction to Case SYMBOL θJC RATINGS 17 UNIT °С/W
ELECTRICAL CHARACTERISTICS (IOUT = 10mA, Ta = 25°С, unless otherwise specified.)
UC8383-2.5V (VIN = 1.5V) 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 UC8383-2.7V (VIN =1.6V) PARAMETER Output Voltage Start-up Voltage (VIN-VF) (Note) Hold-on Voltage Supply Current Internal Switch RDS(ON) Internal Leakage Current Maximum Oscillator Frequency Oscillator Duty Cycle Efficiency UC8383-2.8V (VIN =1.7V) PARAMETER Output Voltage Start-up Voltage (VIN-VF) (Note) 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 η SYMBOL VOUT VSTART VHOLD ISUPPLY RLX ILX(LEAK) fOSC Dty η SYMBOL VOUT VSTART VHOLD ISUPPLY RLX ILX(LEAK) fOSC Dty η TEST CONDITIONS IOUT = 1mA IOUT = 1mA IOUT = 0 ILX = 150mA VLX = 4V, VOUT = 3V MIN 2.45 0.6 18 850 0.5 120 80 82 MIN 2.646 0.6 18 850 0.5 120 80 82 MIN 2.744 0.6 18 850 0.5 120 80 82 TYP 2.8 0.8 MAX 2.856 1.2 TYP 2.7 0.8 MAX 2.754 1.2 TYP 2.5 0.8 MAX 2.55 1.2 UNIT V V V µA mΩ µA KHz % % UNIT V V V µA mΩ µA KHz % % UNIT V V V µA mΩ µA KHz % %
IOUT = 50mA TEST CONDITIONS IOUT = 1mA IOUT = 1mA IOUT = 0 ILX = 150mA VLX = 4V, VOUT = 3.3V
IOUT = 50mA TEST CONDITIONS IOUT = 1mA IOUT = 1mA IOUT = 0 ILX = 150mA VLX = 4V, VOUT = 3.3V
IOUT = 50mA
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UC8383
ELECTRICAL CHARACTERISTICS(Cont.)
UC8383-3.0V (VIN = 1.8V) PARAMETER Output Voltage Start-up Voltage (VIN-VF) (Note) Hold-on Voltage Supply Current Internal Switch RDS(ON) Internal Leakage Current Maximum Oscillator Frequency Oscillator Duty Cycle Efficiency UC83830-3.3V (VIN = 2V) PARAMETER Output Voltage Start-up Voltage (VIN-VF) (Note) Hold-on Voltage Supply Current Internal Switch RDS(ON) Internal Leakage Current Maximum Oscillator Frequency Oscillator Duty Cycle Efficiency UC83830-3.6V (VIN = 2V) PARAMETER Output Voltage Start-up Voltage (VIN-VF) (Note) 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 η TEST CONDITIONS IOUT = 1mA IOUT = 1mA IOUT = 0 ILX = 150mA VLX = 4V, VOUT = 3.8V MIN 3.528 0.6 18 850 TYP 3.6 0.8 SYMBOL VOUT VSTART VHOLD ISUPPLY RLX ILX(LEAK) fOSC Dty η SYMBOL VOUT VSTART VHOLD ISUPPLY RLX ILX(LEAK) fOSC Dty η TEST CONDITIONS IOUT = 1mA IOUT = 1mA IOUT = 0 ILX = 150mA VLX = 4V, VOUT = 3.5V MIN 2.94 0.6 18 850 0.1 120 80 82 MIN 3.234 0.6 18 850 TYP 3.3 0.8 TYP 3 0.8
CMOS IC
MAX 3.06 1.2
0.5
IOUT = 50mA TEST CONDITIONS IOUT = 1mA IOUT = 1mA IOUT = 0 ILX = 150mA VLX = 4V, VOUT = 3.8V
UNIT V V V µA mΩ µA KHz % % UNIT V V V µA mΩ µA KHz % % UNIT V V V µA mΩ µA KHz % %
MAX 3.366 1.2
0.5 120 80 84 MAX 3.672 1.2
IOUT = 50mA
0.5 120 80 84
IOUT = 50mA
UC83830-5.0V (VIN = 3V) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Output Voltage VOUT 4.9 5.0 5.1 V Start-up Voltage (VIN-VF) (Note) VSTART IOUT = 1mA 0.8 1.2 V Hold-on Voltage VHOLD IOUT = 1mA 0.6 V Supply Current ISUPPLY IOUT = 0 18 µA Internal Switch RDS(ON) RLX ILX = 150mA 700 mΩ Internal Leakage Current ILX(LEAK) VLX = 4V, VOUT = 5.5V 0.1 0.5 µA Maximum Oscillator Frequency fOSC 120 KHz Oscillator Duty Cycle Dty 80 % Efficiency η IOUT = 50mA 85 % Note: The minimum value of the device start-up voltage is strictly a function of the forward voltage (VF) of the diode.
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UC8383
TYPICAL APPLICATION
CMOS IC
L VIN
D VOUT
Lx CIN VSS
OUT COUT
UTC UC8383
Application Circuit Application Circuit Notes: 1. The inductors: an inductor value of 47µH performs well in this application. 2. The diode: an high switching speed and low forward voltage diode. 3. The input capacitor: A value of 4.7µF tantalum capacitor is enough to guarantee stability. 4. The output capacitor: The best choice for the value of the output capacitance is 47µF tantalum capacitor. And the capacitance value should be in the range of about 10µF-100µF.
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UC8383
TYPICAL CHARACTERISTICS
CMOS IC
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UC8383
TYPICAL CHARACTERISTICS(Cont.)
CMOS IC
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UC8383
TYPICAL CHARACTERISTICS(Cont.)
Output Waveform of LX
VIN=2.5V, ILOAD=1mA, VOUT=3.6V
CMOS IC
Output Waveform of LX
VIN=2.5V, ILOAD=10mA, VOUT=3.6V
Upper Trace: Output Voltage, 1V/Division Lower Trace: LX Mode Voltage, 1V/Division
Upper Trace: Output Voltage, 1V/Division Lower Trace: LX Mode Voltage, 1V/Division
Output Waveform of LX
VIN=2.5V, ILOAD=50mA, VOUT=3.6V
Output Waveform of LX
VIN=2.5V, ILOAD=100mA, VOUT=3.6V
Upper Trace: Output Voltage, 1V/Division Lower Trace: LX Mode Voltage, 1V/Division
Upper Trace: Output Voltage, 1V/Division Lower Trace: LX Mode Voltage, 1V/Division
Output Waveform of LX
VIN=2.5V, ILOAD=200mA, VOUT=3.6V
Output Waveform of LX Under Maximum Frequency
VOUT=3.6V, focs1=112.8kHz, Dty:82.5%
Upper Trace: Output Voltage, 1V/Division Lower Trace: LX Mode Voltage, 1V/Division
Upper Trace: Output Voltage, 1V/Division Lower Trace: LX Mode Voltage, 1V/Division
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UC8383
CMOS IC
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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