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 APPLICATIONS *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. *Constant current source for battery chargers. *Saver for cellular phones. *Step-Down DC-DC converter module. PIN CONFIGURATION UTC DC 1 8 BOOST DE 2 7 IS CF 3 6 VCC GND 4 5 FB UNISONIC TECHNOLOGIES CO., LTD. 1 QW-R103-013,B UTC 3563 LINEAR INTEGRATED CIRCUIT BLOCK DIAGRAM PIN SYMBOL PIN SYMBOL 1 DC 2A switch collector DESCRIPTION 5 FB 2 DE Darlington switch emitter 6 VCC 3 CF Oscillator timing capacitor 7 IS DESCRIPTION Feedback comparator inverting input Power supply input Highside current sense input (VCC-VIS=300mV) 4 GND UTC Power ground 8 BOOST Bootstrapped driver collector UNISONIC TECHNOLOGIES CO., LTD. 2 QW-R103-013,B UTC 3563 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS (Ta=25°C) PARAMETER 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 SYMBOL VALUE UNIT VCC Vi VC(switch) VE(switch) VCE(switch) VC(driver) ISW 30 -0.3~+30 30 30 30 30 2 V V V V V V A 1000 625 mW mW 100 160 125 0~+70 -65~+150 °C/W °C/W °C °C °C Tj Ta Tstg ELECTRICAL CHARACTERISTICS (VCC=5.0V, Ta=25°C, unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS MIN TYP. MAX UNIT ICHG IDISCHG Vosc IDISCHG / ICHG VCC -VIS 5V≤VCC≤30V 5V≤VCC≤30V PIN 3 VIS=VCC 10 100 25 150 0.6 6.0 40 200 µA µA V ICHG=IDISCHG 250 300 350 mV VCE(SAT) IDE=1.0A, VBOOST=VDC=VCC IDC=1.0A, IBOOST=50mA, (Forced β≈20) ISC=1.0A VCE=5.0V VCE=30V 1.5 1.8 V 0.4 0.7 V Oscillator Charging Current Discharging Current Voltage Swing Discharge to Charge Current Ratio Current limit Sense Voltage Output Switch Saturation Voltage, Emitter Follower Connection Saturation Voltage DC Current Gain VCE(SAT) hFE Collector Off State Current IC(OFF) 35 120 10 nA Comparator Threshold Voltage VFB Threshold voltage Line Regulation Input Bias Current Supply Current UTC REGLINE IIB ICC 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 1.225 1.210 1.250 0.1 0.4 1.6 1.275 1.290 0.3 1.0 3.0 UNISONIC TECHNOLOGIES CO., LTD. V V mV/V µA mA 3 QW-R103-013,B UTC 3563 LINEAR INTEGRATED CIRCUIT TEST 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 STEP-DOWN VOUT+VF VIN(MIN)-VSAT-VOUT (tON+tOFF)MAX 1/FMIN CT 4x10-5tON IC(SWITCH) 2IOUT(MAX) RS L(MIN) 0.3/IC(SWITCH) VIN(MIN)-VSAT-VOUT ( ) tON(MAX) IC(SWITCH) IC(SWITCH) (tON+tOFF) 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 Co 8VRIPPLE(P-P) VRIPPLE(P-P) 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