UNISONIC TECHNOLOGIES CO., LTD UC3500 CMOS IC HIGH EFFICIENCY VFM CONTROLLED STEP-UP DC/DC CONVERTER 3 2 1 5 4 SOT-25 APPLICATIONS * Cellular telephones * PDA and hand held instruments * Palmtop and notebook computer * Portable equipment * Battery powered equipment 1 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. *Pb-free plating product number: UC3500L 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 Normal Lead Free Plating UC3500-xx-AB3-R UC3500L-xx-AB3-R UC3500-xx-AF5-R UC3500L-xx-AF5-R UC3550L-xx-AB3-R Package Packing SOT-89 SOT-25 Tape Reel Tape Reel (1)Packing Type (1) R: Tape Reel (2)Package Type (2) AB3: SOT-89, AF5: SOT-25 (3)Voltage Code (3) xx: reference to Marking Information (4)Lead Plating (4) L: Lead Free Plating, Blank: Pb/Sn www.unisonic.com.tw Copyright © 2005 Unisonic Technologies Co., Ltd 1 of 9 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 Date Code SOT-89 5 Lead Plating UC3XX Voltage Code 1 2 3 PIN CONFIGURATION OUT GND 3 2 LX 1 4 5 1 NC NC LX 2 3 GND OUT UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 9 QW-R502-072,A UC3500 CMOS IC BLOCK DIAGRAM OUT OUT LX OSCILLATOR ERROR AMPLIFIER VFM CONTROL VREF VIX LIMITER GND UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 9 QW-R502-072,A UC3500 CMOS IC ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL VOUT VIN VLX ILX 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=25°C ℃/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 SYMBOL VOUT Start-up Voltage (VIN-VF) (Note 1) VSTART Hold-on Voltage VHOLD Supply Current Internal Switch RDS(ON) Internal Leakage Current Maximum Oscillator Frequency Oscillator Duty Cycle ISUPPLY RLX ILX(LEAK) fOSC Dty Efficiency η 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 0.4 0.3 240 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 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 µA mΩ µA KHz % % % % Note 1: VF references to the forward voltage of the diode. UC3500-2.8V (VIN = 1.6V) PARAMETER Output Voltage SYMBOL VOUT Start-up Voltage (VIN-VF) VSTART Hold-on Voltage VHOLD Supply Current Internal Switch RDS(ON) Internal Leakage Current Maximum Oscillator Frequency Oscillator Duty Cycle ISUPPLY RLX ILX(LEAK) fOSC Dty Efficiency η 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 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw MIN 2.7 0.4 0.3 240 0.3 360 UNIT V V V V V µA mΩ µA KHz % % % % 4 of 9 QW-R502-072,A UC3500 CMOS IC ELECTRICAL CHARACTERISTICS(Cont.) UC3500-3.0V (VIN = 1.8V) PARAMETER Output Voltage SYMBOL VOUT Start-up Voltage (VIN-VF) VSTART Hold-on Voltage VHOLD Supply Current Internal Switch RDS(ON) Internal Leakage Current Maximum Oscillator Frequency Oscillator Duty Cycle ISUPPLY RLX ILX(LEAK) fOSC Dty Efficiency η UC3500-3.3V (VIN = 2.0V) PARAMETER Output Voltage SYMBOL VOUT Start-up Voltage (VIN-VF) VSTART Hold-on Voltage VHOLD Supply Current Internal Switch RDS(ON) Internal Leakage Current Maximum Oscillator Frequency Oscillator Duty Cycle ISUPPLY RLX ILX(LEAK) fOSC Dty Efficiency η UC3500-5.0V (VIN = 3.0V) PARAMETER Output Voltage SYMBOL VOUT Start-up Voltage (VIN-VF) VSTART Hold-on Voltage VHOLD Supply Current Internal Switch RDS(ON) Internal Leakage Current Maximum Oscillator Frequency Oscillator Duty Cycle ISUPPLY RLX ILX(LEAK) fOSC Dty Efficiency η 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 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 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 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 0.4 0.3 240 0.4 0.3 240 0.4 0.3 240 TYP 3 0.7 0.8 0.6 0.5 18 750 0.1 300 75 82 84 82 MAX 3.1 1.1 1.2 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 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 0.3 360 0.3 360 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 % % % % 5 of 9 QW-R502-072,A 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. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 9 QW-R502-072,A UC3500 CMOS IC TYPICAL APPLICATION CIRCUIT D VIN L=47µH CIN=4.7µF 5 4 NC NC LX 1 GND OUT 2 3 VOUT C OUT=47µF RECONMMENDED COMPONENTS L D CIN COUT ：47µH (Sunida CD54 Fosc＝500kHz) ：MA737, or MBRM110L ：10V 4.7µF (Tantalum) ：16V 47µF (Tantalum) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 7 of 9 QW-R502-072,A UC3500 CMOS IC TYPICAL CHARACTERISTICS Output Voltage vs. Temperature 90 VOUT=5.0 IOUT=50mA VIN=3V 6.0 Efficiency, η (%) Output Voltage, VOUT (V) 7.0 5.0 4.0 3.0 2.0 1.0 -40 -20 0 Efficiency vs. Temperature VOUT=3.0 IOUT=50mA VIN=1.8V 20 40 60 85 80 75 65 60 -40 80 100 0.80 0.75 0.70 VOUT=3.0 IOUT=1mA 0.65 0.60 -40 -20 0 20 40 60 1.25 VOUT=3.0 ILX=150mA VIN=1.8V 0.6 0.5 0.4 0.3 -40 -20 0 20 40 60 80 100 Junction Temperature, TJ (℃) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 1 10 Output Current, IOUT (mA) Hold-on Voltage vs . Temperature Hold-on Voltage, VHOLD (V) Internal Switch, RLX(ON) (Ω) 0.7 VOUT=5.0 0.75 Internal Switch RDS(ON) vs. Temperature 0.8 VOUT=3.0 1.00 0.50 0.1 80 100 VOUT=5.0 ILX =150mA VIN=3V 80 100 40 60 1.50 Junction Tempetature, TJ (℃) 0.9 20 Start-up Voltage (VIN - VF ) vs. Output Current Start-up Voltage, VSTART (V) Start-up Voltage, VSTART (V) VOUT=5.0 IOUT=1mA -20 0 Junction Temperature, T J (℃) Start-up Voltage (VIN - VF) vs. Temperature 0.85 VOUT=3.0 IOUT=50mA VIN=1.8V 70 Junction Temperature, T J (℃) 0.90 VOUT=5.0 IOUT=50mA VIN=3V 0.6 0.5 VOUT=5.0 I OUT=1mA 0.4 0.3 VOUT=3.0 I OUT=1mA 0.2 0.1 0 -40 -20 0 20 40 60 80 100 Junction Temperature, TJ (℃) 8 of 9 QW-R502-072,A UC3500 CMOS IC TYPICAL CHARACTERISTICS(Cont.) 6 5 3V 4 1V 2V 3 2 VOUT=5.0 1 0 0 Output Voltage vs. Output Current Output Voltage, VOUT (V) Output Voltage, VOUT (V) Output Voltage vs. Output Current 3.0 2V 2.5 1V 2.0 1.5 1.0 VOUT=3.0 0.5 0 0 50 100 150 200 250 300 350 Output Current, IOUT (mA) Efficiency vs. Output Current 90 80 Efficiency, η (%) 90 Efficiency, η (%) 50 100 150 200 250 300 350 Output Current, IOUT (mA) Efficiency vs. Output Current 3V 1V 70 2V 60 50 40 1.5V 50 100 150 200 250 2V 70 1V 1.5V 60 50 VOUT=5.0 0 80 300 Output Current, IOUT (mA) 40 VOUT=3.0 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. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 9 of 9 QW-R502-072,A