AIC1563 Versatile DC/DC Converter FEATURES DESCRIPTION The AIC1563 is a monolithic control circuit 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%). 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 Internal ±2% Reference. Low Quiescent Current at 1.6mA. Frequency Operation from 100Hz to 100KHz. active current sense circuit, bootstrapped driver, and high current output switch. This device is specifically designed to construct a constant APPLICATIONS current source for battery chargers with a minimum number of external components. Boot- Constant Current Source for Battery Chargers. Saver for Cellular phones. Step-Down DC-DC Converter Module. strapped driver can drive the NPN output switch to saturation for higher efficiency and less heat dissipation. The AIC1563 can deliver 1.5A continuous current without requiring a heat sink. TYPICAL APPLICATION CIRCUIT R1 220µH 1K 3C 1µF R2 120 D2 + 220µF 470pF CO 90 C5 10µF IS V IN= 16V, V O= 8V 80 VCC CF CT + BOOST DE C1 IO 100 V IN = 16V, V O= 12V D1 1N5821 + DC 220µF (%) *RS L 1N1418 VIN D3 1N5819 GND RB FB AIC1563 RA 5.6K 33K 70 0 *IO=300mV/RS 0.5 1 1.5 2 Io (A ) Efficiency vs Output Current Analog Integrations Corporation 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC DS-1563-01 TEL: 886-3-5772500 Jan 30, 01 FAX: 886-3-5772510 www.analog.com.tw 1 AIC1563 AIC1563 ORDERING INFORMATION AIC1563 XX PACKAGE TYPE N: PLASTIC DIP S: SMALL OUTLINE ORDER NUMBER TOP VIEW AIC1563CN (PLASTIC DIP) TEMPERATURE C: 0°C~+70°C PIN CONFIGURATION DC 1 DE 2 CF 3 GND 4 AIC1563CS (PLASTIC SO) 8 BOOST 7 IS 6 VCC 5 FB ABSOLUTE MAXIMUM RATINGS Supply Voltage ..............................................................……………............................. 30V Comparator Input Voltage Range ............................................………….......... -0.3V~30V Switch Collector Voltage ....................................................……………......................... 30V Switch Emitter Voltage ......................................................……………......................... 30V Switch Collector to Emitter Voltage ..................................…………............................. 30V Driver Collector Voltage ....................................................…………….......................... 30V Switch Current ................................................………………......................................... 2A Power Dissipation and Thermal Characteristics DIP Package Ta= 25°C ............................…………................................ 1.0W Thermal Resistance .............…………......................... 100°C/W SO Package Ta= 25°C ......................……………............................... 625mW Thermal Resistance ...................………...................... 160°C/W Operating Junction Temperature .....................................................………............. 125°C Operating Ambient Temperature Range .......................……………......................... 0~70°C Storage Temperature Range ...................................………….................... - 65°C ~ 150°C TEST CIRCUIT R1 VCC 1K 50mA Current Source 1A Current Source 1 4.55V @VCC=5V DC BOOST 8 2 3 2V/0V IDISCHG/ ICHG DE IS CF VCC 4 FB GND AIC1563 CT 4.75V 7 6 VCC 5 1.275V 1.225V 1nF 2 AIC1563 AIC1563 ELECTRICAL CHARACTERISTICS (VCC= 5V, Ta=25°°C, unless otherwise specified.) PARAMETER TEST CONDITIONS SYMBOL MIN. TYP. MAX. UNIT Oscillator Charging Current 5.0V≤VCC≤30V ICHG 10 25 40 µA Discharge Current 5.0V≤VCC≤30V IDISCHG 100 150 200 µA Voltage Swing PIN 3 Discharge to Charge Current Ratio VIS =VCC Current Limit Sense Voltage ICHG=IDISCHG VOSC 0.6 IDISCHG / ICHG 6.0 VCC - VIS 250 V 300 350 mV Output Switch Saturation Voltage, Emitter Follower Connection IDE=1.0A; VBOOST =VDC = VCC VCE(SAT) 1.5 1.8 V Saturation Voltage IDC=1.0A; IBOOST =50mA, (Forced β≅20) VCE (SAT) 0.4 0.7 V DC Current Gain ISC =1.0A; VCE=5.0V Collector Off-State Current VCE=30V IC(OFF) Ta=25°C VFB hFE 35 120 10 nA Comparactor Threshold Voltage 0°C ≤ Ta ≤ 70°C Threshold Voltage Line Regulation 3.0V≤VCC≤30V Input Bias Current Supply Current 1.225 1.25 1.21 1.275 V 1.29 V REGLINE 0.1 0.3 mV/V VIN=0V IIB 0.4 1 µA VIS =VCC, pin 5>VFB 5.0V≤ VCC ≤30V CT=1nF PIN 2=GND Remaining pins open ICC 1.6 3 mA 3 AIC1563 AIC1563 TYPICAL PERFORMANCE CHARACTERISTICS Standby Supply Current vs Supply Voltage 2 ICC, Supply Current (mA) 1000 VCC=5V VIS =VCC PIN 5=GND 10 100 ON -TIME OFF-TIME 1 tON-OFF, Output Switch ON-OFF Time (µS) Output Switch ON-OFF Time vs Oscillator Timing Capacitor 1 0.1 10 1.6 0.8 0.4 0 100 CT = 1nF VIS = VCC PIN 2 =GND 1.2 CT, Oscillator Timing Capacitor (nF) 0 5 VFB, Threshold Voltage vs Temperature 25 20 30 350 VFB, Threshold Voltage (mV) VCC = 5V, CT = 1nF, PIN 2 = GND 1.28 VFB, Threshold Voltage (V) 15 IS Threshold Voltage vs Temperature 1.3 1.26 1.24 1.22 1.2 340 10 20 30 40 50 60 70 VCC = 5V, CT = 1nF, PIN 2 = GND 330 320 310 300 290 280 270 260 250 0 80 0 0.8 1.8 VCE(SAT), Saturation Voltage (V) 1.7 1.6 1.5 1.4 1.3 20 30 40 50 60 70 80 Common Emitter Configuration Output Switch Saturation Voltage vs Collector Current Emmiter Follower Configuration Output Switch Saturation Voltage vs Emmiter Current VCC = 5V PIN 1, 7, 8 = VCC PIN 3, 5 = GND 10 Temperature (°C) Temperature (°C) VCE(SAT), Saturation Voltage (V) 10 VCC, Supply Voltage (V) VCC = 5V PIN 7 = VCC PIN 2, 3, 5 = GND 0.6 0.4 Forced Beta = 20 0.2 0 1.2 0 0.5 IE, 1 Emitter Current (A) 1.5 0 0.5 IC, 1 Collector Current (A) 1.5 4 AIC1563 AIC1563 BLOCK DIAGRAM 1 DC 8 Q2 QS Q1 R 80 2 DE BOOST 7 IS Is CT Oscillator 6 3 CF Comparator 1.25V Reference Voltage + - 4 GND VCC 5 FB PIN DESCRIPTIONS PIN 1: DC - 2A switch collector. PIN 5: FB PIN 2: DE - Darlington switch emitter. PIN 6: VCC - Power supply input. PIN 3: CF - Oscillator timing capacitor. PIN 7: IS PIN 4: GND - Power ground. - Feedback comparator inverting input. - Highside current sense input. VCC - VIS=300mV. PIN 8: BOOST-Bootstrapped driver collector. APPLICATION INFORMATIONS DESIGN FORMULA TABLE CALCULATION t ON t OFF (tON + tOFF) MAX STEP-DOWN STEP-UP VOUT + VF VIN(MIN) - VSAT - VOUT 1 FMIN VOUT + VF - VIN(MIN) VIN(MIN) - VSAT 1 FMIN -5 CT 4x10 tON IC (SWITCH) 2IOUT(MAX) RS L(MIN) Co -5 4 x 10 tON 2IOUT(MAX) ( 0.3/IC(SWITCH) ( VIN(MIN) - VSAT - VOUT )tON(MAX) IC(SWITCH) IC ( SWITCH) (t ON + t OFF ) 8V RIPPLE (P - P ) t ON + t OFF ) t OFF 0.3/ IC (SWITCH) ( VIN(MIN) - VSAT )tON(MAX) IC(SWITCH) IOUT tON VRIPPLE(P - P) 5 AIC1563 AIC1563 VSAT = Saturation voltage of the output switch. = Forward voltage of the ringback rectifier VF 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. The following power supply characteristics must be chosen: VIN - Nominal input voltage. VOUT - Desired output voltage, - Minimum desired switching frequency at FMIN VOUT = 1.25 (1 + RB/RA) - Desired output current. IOUT APPLICATION EXAMPLES VIN 12~15V + C1 13µF 120 0.5W R1 R2 1K D1 1N4148 1 2 3 4 C4 470pF DC BOOST L1 220µH + C3 1µF + 8 D2 1N5819 0.33Ω 1W *RS C4 220µF D4 1N5819 CF GND FB + ZD1 9.1V R5 1K C7 100µF BATTERY 3~5 CELLS 1 C6 0.1µF R4 51K + 5 *Fast Charge Current =(0. 3/RS) Ampere 2 3 C5 4.7µF 4 AIC1563 LED1 RED R9 1K R3 100K R7 150K IS 7 6 VCC DE R8 470 D3 1N4148 VBT GND VREF R10 1K 8 VDD 7 TIMER VOUT MODE LED2 GREEN LED 6 5 AIC1761/1766 Fig. 1 Simplified Battery Charge Circuit for Ni-Cd/ Ni-MH Battery 1K R2 220µH *L1 C3 1µF D2 1N5821 C1 10µF C2 470pF R16 91K 8 DC BOOST DE IS 3 CF VCC 2 4 GND 7 6 FB 5 R7 270 R6 20/5W R15 300K 1N4148 1 + 1N5819 Thermistor 120/0.5W RS + D3 *BATTERY 11V~15V VIN C4 220µF + D1 R1 0.33/1W YELLOW 100K + R5 C5 C6 4.7µF 0.1µF Q2 D468 RX C7 RY 0.1µF R9 200K R10 50K 78L05 Note: Charge Current: 0.3V/RS Ampere Safety Timer=80 min. ∆T/∆t=1°C/min. R8 R4 470 3904 Q1 PEAK 2 VBT C8 100µF + C9 0.1µF 100K DSW 16 ICON 15 R12 5 VCC 220K LED2 14 R13 680 GREEN LED1 13 R14 RED GND 12 680 6 ADJ SEL1 11 7 SEL3 SEL2 10 3 DIS 4 VTS AIC1563 *Iron Powder Core ** 3~5 NiMH/ NiCd Cells 680 1 8 TMR MODE 9 R11 AIC1781 Fig. 2 Battery Charge Circuit for Fluctuating Charging Current Applications 6 AIC1563 AIC1563 APPLICATION EXAMPLES (CONTINUED) D3 D2 R1 470 + 1N4148 RS 0.22 8V~25V + 7 6 5 C1 100µF L1 300µH 1µF 8 VIN 1N4148 C3 BOOST DC IS DE VCC CF GND FB D1 1N5819 1 2 + 5V/1A C4 470µF R2 390K 3 4 RB C2 1000pF RA 1K AIC1563 3K R3 When VIN>15V, Then, R1=1K 2.2M Line Regulation VIN = 10V~20V @ IO=1A 40mV Load Regulation VIN = 15V, @ IO=100mA~1A 20mV Short Circuit Current VIN =15V, @ RL = 0.1Ω 1.3A Fig. 3 Step-Down Converter C3 D1 5V 1N5819 VIN 16V~25V + 7 6 C1 100µF 300µH 1µF 8 RS 0.22 L1 + 5 BOOST DC IS DE VCC CF FB GND D1 1N5819 1 12V/1A C4 470µF 2 3 4 RB C2 470pF AIC1563 + RA 1K 13K Fig. 4 Step-Down Converter with External 5V Bootstrap 7 AIC1563 AIC1563 APPLICATION EXAMPLES (CONTINUED) D1 200µH VOUT L 1N5819 R1 150 RS 0.22 VIN + C1 8 BOOST DC 1 7 IS DE 2 6 VCC CF 3 C0 200µF GND 4 5 FB 100µF 28V/200mA + CT 680pF AIC1563 RA RB 2.2K 47K Line Regulation VIN = 8V~16V @ IO=200mA 100mV Load Regulation VIN = 12V, @ IO=80mA~200mA 40mV Fig. 5 Step-Up Converter D1 L R1 8 7 RS VIN 6 + C1 5 BOOST DC IS DE CF VCC FB GND C0 1 2 + Q1 3 4 VOUT R2 CT A RA RB Fig. 6 Step-Up Converter with External NPN Switch 8 AIC1563 AIC1563 APPLICATION EXAMPLES (CONTINUED) 1 2 L 3 100µH D1 4 CT 600pF DC BOOST DE IS CF VCC 7 + C1 FB 470µF 100µF RB 953 RB C0 VIN 4.5V~6V + 5 AIC1563 VOUT -12V/100mA 0.26 RS 6 GND 1N5819 8 8.2K Line Regulation VIN = 4.5V~6V @ IO=100mA 20mV Load Regulation VIN = 5V, @ IO=10mA~100mA 100mV Fig.7 Inverting Converter PHYSICAL DIMENSIONS 8 LEAD PLASTIC SO (unit: mm) D H E e C B SYMBOL MIN MAX A 1.35 1.75 A1 0.10 0.25 B 0.33 0.51 C 0.19 0.25 D 4.80 5.00 E 3.80 4.00 e A A1 1.27(TYP) H 5.80 6.20 L 0.40 1.27 L 9 AIC1563 AIC1563 8 LEAD PLASTIC DIP (unit: mm) D E1 E A2 A1 C L eB b e SYMBOL MIN MAX A1 0.381 — A2 2.92 4.96 b 0.35 0.56 C 0.20 0.36 D 9.01 10.16 E 7.62 8.26 E1 6.09 7.12 e 2.54 (TYP) eB — 10.92 L 2.92 3.81 10