3563

UTC 3563 LINEAR INTEGRATED CIRCUIT HIGH-EFFICIENCY DC/DC CONVERTER DESCRIPTION The UTC 3563 is a monolithic control circuit containing the primary functions required for DC to DC converters and highside-sensed constant current source. The device consists of an internal temperature compensated reference, comparator, controlled duty cycle oscillator with an active current sense circuit, bootstrapped driver, and high current output switch. This device is specifically designed to construct a constant current source for battery chargers with a minimum number of external components. Bootstrapped driver can drive the NPN output switch to saturation for higher efficiency and less heat dissipation. The UTC 3563 can deliver 1.5A continuous current without requiring a heat sink. SOP-8 DIP-8 FEATURES *3V to 30V input voltage operation. *Internal 2A peak current switch. *1.5A continuous output current. *Bootstrapped driver. *High side current sense capability. *High efficiency (up to 90%) *Internal ±2% reference. *Low quiescent current at 1.6mA. *Frequency operation from 100Hz to 100KHz. APPLICATIONS *Constant current source for battery chargers. *Saver for cellular phones. *Step-Down DC-DC converter module. PIN CONFIGURATION DC 1 8 BOOST DE 2 7 IS CF 3 6 VCC GND 4 5 FB UTC UNISONIC TECHNOLOGIES CO., LTD. 1 QW-R103-013,B UTC 3563 BLOCK DIAGRAM LINEAR INTEGRATED CIRCUIT PIN 1 2 3 4 SYMBOL DC DE CF GND DESCRIPTION 2A switch collector Darlington switch emitter Oscillator timing capacitor Power ground PIN 5 6 7 8 SYMBOL FB VCC IS BOOST DESCRIPTION Feedback comparator inverting input Power supply input Highside current sense input (VCC-VIS=300mV) Bootstrapped driver collector UTC UNISONIC TECHNOLOGIES CO., LTD. 2 QW-R103-013,B UTC 3563 PARAMETER LINEAR INTEGRATED CIRCUIT SYMBOL VCC Vi VC(switch) VE(switch) VCE(switch) VC(driver) ISW ABSOLUTE MAXIMUM RATINGS (Ta=25°C) VALUE 30 -0.3~+30 30 30 30 30 2 1000 625 100 160 125 0~+70 -65~+150 UNIT V V V V V V A mW mW °C/W °C/W °C °C °C Supply Voltage Comparator input voltage range Switch collector voltage Switch emitter Voltage Switch collector to emitter voltage Driver collector Voltage Switch current Power dissipation (Ta=25°C) DIP-8 SOP-8 Thermal Resistance DIP-8 SOP-8 Operating junction temperature Operating ambient temperature range Storage temperature range Tj Ta Tstg ELECTRICAL CHARACTERISTICS (VCC=5.0V, Ta=25°C, unless otherwise specified) PARAMETER SYMBOL ICHG IDISCHG Vosc IDISCHG / ICHG VCC -VIS VCE(SAT) VCE(SAT) hFE IC(OFF) VFB REGLINE IIB ICC TEST CONDITIONS 5V≤VCC≤30V 5V≤VCC≤30V PIN 3 VIS=VCC ICHG=IDISCHG IDE=1.0A, VBOOST=VDC=VCC IDC=1.0A, IBOOST=50mA, (Forced β≈20) ISC=1.0A VCE=5.0V VCE=30V Ta=25°C 0°C≤Ta≤70°C 3V≤VCC≤30V VIN=0V VIS=VCC, PIN 5>VFB, 5.0V≤VCC≤30V, CT=1nF, PIN 2=GND, Remaining pins open MIN 10 100 TYP. 25 150 0.6 6.0 300 1.5 0.4 MAX 40 200 UNIT µA µA V Oscillator Charging Current Discharging Current Voltage Swing Discharge to Charge Current Ratio Current limit Sense Voltage 250 350 1.8 0.7 mV V V Output Switch Saturation Voltage, Emitter Follower Connection Saturation Voltage DC Current Gain Collector Off State Current 35 120 10 nA 1.275 1.290 0.3 1.0 3.0 V V mV/V µA mA Comparator Threshold Voltage Threshold voltage Line Regulation Input Bias Current Supply Current 1.225 1.210 1.250 0.1 0.4 1.6 UTC UNISONIC TECHNOLOGIES CO., LTD. 3 QW-R103-013,B UTC 3563 TEST CIRCUIT LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION CIRCUIT EFFICIENCY vs OUTPUT CURRENT UTC UNISONIC TECHNOLOGIES CO., LTD. 4 QW-R103-013,B UTC 3563 LINEAR INTEGRATED CIRCUIT TYPICAL PERFORMANCE CHARACTERISTICS UTC UNISONIC TECHNOLOGIES CO., LTD. 5 QW-R103-013,B UTC 3563 LINEAR INTEGRATED CIRCUIT APPLICATION INFORMATION DESIGN FORMULA TABLE CALCULATION tON/tOFF (tON+tOFF)MAX CT IC(SWITCH) RS L(MIN) STEP-DOWN VOUT+VF VIN(MIN)-VSAT-VOUT 1/FMIN 4x10-5tON 2IOUT(MAX) 0.3/IC(SWITCH) VIN(MIN)-VSAT-VOUT ( ) tON(MAX) IC(SWITCH) IC(SWITCH) (tON+tOFF) 8VRIPPLE(P-P) STEP-UP VOUT+VF-VIN(MIN) VIN(MIN)-VSAT 1/FMIN 4x10-5tON tON + tOFF 2IOUT(MAX)( tOFF 0.3/IC(SWITCH) VIN(MIN) - VSAT ( ) tON(MAX) IC(SWITCH) IOUT tON VRIPPLE(P-P) ) Co VSAT : Saturation voltage of the output switch VF : Forward voltage of the ringback rectifier The following power supply characteristics must be chosen: VIN : Norminal input voltage VOUT : Desired output voltage, VOUT=1.25(1+RB/RA) IOUT : Desired output current FMIN : Minimum desired switching frequency at selected values for VIN AND IOUT VRIPPLE(P-P) : Desired peak-to-peak output ripple voltage. In practice, the calculated value will need to be increased due to the capacitor equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will directly affect the line and load regulation. APPLICATION EXAMPLES Fig. 1 Simplified Battery Charge Circuit for Ni-Cd/Ni-MH Battery UTC UNISONIC TECHNOLOGIES CO., LTD. 6 QW-R103-013,B UTC 3563 LINEAR INTEGRATED CIRCUIT Fig.2 Battery Charge Circuit for Fluctuating Charging Current Applications Fig. 3 Step-Down Converter Line regulation: 40mV (VIN=10V~20V, @IO=1A) Load regulation: 20mV (VIN=15V, @IO=100mA~1A) Short circuit current: 1.3A (VIN=15V, @RL=0.1Ω) UTC UNISONIC TECHNOLOGIES CO., LTD. 7 QW-R103-013,B UTC 3563 LINEAR INTEGRATED CIRCUIT Fig. 4 Step-Down Converter with External 5V Bootstrap Fig. 5 Step-Up Converter Line regulation: 100mV (VIN=8V~16V, @Io=200mA) Load regulation: 40mV (VIN=12V, @IO=80mA~200mA) UTC UNISONIC TECHNOLOGIES CO., LTD. 8 QW-R103-013,B UTC 3563 LINEAR INTEGRATED CIRCUIT Fig. 6 Step-Up Converter with External NPN Switch Fig. 7 Inverting Converter Line regulation: 20mV (VIN=4.5V~6V, @IO=100mA) Load regulation: 100mV (VIN=5V, @IO=10mA~100mA) UTC UNISONIC TECHNOLOGIES CO., LTD. 9 QW-R103-013,B UTC 3563 LINEAR INTEGRATED CIRCUIT 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. UTC UNISONIC TECHNOLOGIES CO., LTD. 10 QW-R103-013,B