AMS34063 GENERAL DESCRIPTION FEATURES is a monolithic control 3V to 40V Input Voltage Operation. circuit containing the primary functions required Internal 1.5A Peak Current Switch. for DC/DC converters. The device consists of an Internal ±2% Reference. internal temperature compensated reference, Low Quiescent Current . comparator, controlled duty cycle oscillator with Frequency Operation Up to 100KHz. an active current limit circuit, driver and high Low Dropout Operation: 100% Duty Cycle current output switch. This device is specifically Current Limiting. designed to be incorporated in step-down, Standard DIP8 and SOP8 Packages The AMS34063 step-up and voltage-inverting applications with a minimum number of external components. The Applications ±2% internal reference and low quiescent current of 1.6mA are among the improvements of the DC-DC Converter Module device over the competition ADSL Modems Hub. Battery Chargers Functional Diagram 1 Advanced Monolithic Systems http://www.ams-semitech.com AMS34063 Pin Description Symbol Pin NO. Description SC 1 1.5A switch collector SE 2 Darlington switch emitter TC 3 Oscillator timing capacitor GND 4 Power GND FB 5 Feedback comparator inverting input VCC 6 Power supply input IPK 7 Highside current sense input, VCC - VIPK=300mV DRI 8 Drive collector Ordering Information ORDERI NG NUM BER PACKAGE AMS34063 SOP8 AMS34063A DIP8 Absolute Maximum Ratings Supply Voltage ……………….……………………. ………………………………… ……40V Comparator Input Voltage Range ……………………….……..………………………-0.3V~40V Switch Collector Voltage ………………………………………………………………. 40V Switch Emitter Voltage …………………………………………………………………… 40V Switch Collector to Emitter Voltage …………………………………………………….. .40V Driver Collector Voltage …………………………………………………………………….40V Switch Current………………………………………………………………………………..1.5A 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°C~70°C Storage Temperature Range ……………....……………………………………... 2 Advanced Monolithic Systems http://www.ams-semitech.com - 65°C~150°C AMS34063 Electrical Characteristics (Vcc= 5V, Ta=25°C (unless otherwise specified.) Parameter Test Condictions Symbol MIN. TYP. MAX. Unit Oscillator Frequency VPIN5 = 0V ,CT = 1nF Charging Current 5.0V~VCC~40V Discharge Current 5.0V~VCC~40V Voltage Swing PIN 3 Discharge to Charge Current Ratio Current Limit Sense Voltage fOSC ICHG IDISCHG 24 35 46 KHZ 24 35 46 µA 140 220 260 µA 0.6 VOSC VIPK(SENSE) =VCC IDISCHG/ ICHG ICHG=IDISCHG VIPK(SENSE) ISW=1.0A; VCE(SAT) V 6.0 250 320 400 mV Output Switch Saturation Voltage, Darlington Connection Saturation Voltage 1.0 1.3 V 0.45 0.7 V VC(DRIVER)=VC(SWITCH) ISW=1.0A; IC(DRIVER)=50mA (Forced ß=20) DC Current Gain ISW=1.0A; VCE=5.0V Collector Off-State Current VCE=40V VCE (SAT) hFE 50 75 10 IC(OFF) nA Comparator Threshold Voltage 0°C~Ta~70°C VFB Threshold Voltage Threshold Voltage Line 1.225 1.25 1.19 1.275 V 1.31 V 3.0V~VCC~40V REGLINE 0.1 0.3 mV/V Input Bias Current VIN=0V IIB 0.4 1 µA Supply current VIPK(SENSE)=VCC ICC Regulation VPIN 5>VFB 5.0V~VCC~40V CT=0.001µF, PIN 2=GND 3 Advanced Monolithic Systems http://www.ams-semitech.com 4 Ma Typical Performance Characteristics AMS34063 4 Advanced Monolithic Systems http://www.ams-semitech.com AMS34063 Application Information Design Formula Table FMIN - Minimum desired output switching VSAT = Saturation voltage of the output switch. frequency at the selected values for VIN and lOUT VF = voltage drop of the ringback rectifier VRIPPLE (P-P) - Desired peak-to-peak output ripple voltage.In practice, the calculated The following power supply characteristics must be chosen: VIN value will need to be increased due to the capacitor equivalent series resistance -Nominal input voltage. and board layout. The ripple voltage VOUT -Desired output voltage, lOUT |VOUT| =1.25 (1 + RB/RA) - Desired output current. should be kept to a low value since it will directly effect the line and load regulation. 5 Advanced Monolithic Systems http://www.ams-semitech.com AMS34063 Application Examples Line Regulation VIN = 10V ~20V @ IO =500mA 40mV Load Regulation VIN = 15V, @ IO =10mA ~ 500mA 5mV Short Circuit Current VIN =15V, @ RL = 0.1Ω 1.3A Fig.1 Step-Down converter Fig.2 Step-Down converter with External PNP Saturation Switch 6 Advanced Monolithic Systems http://www.ams-semitech.com AMS34063 Application Examples (Continued) Line Regulation VIN = 8V ~16V @ IO =180mA 50mV Load Regulation VIN = 12V, @ IO =80mA ~ 180mA 10mV Fig.3 Step-Up converter Fig.4 Step-up Converter with External NPN Switch 7 Advanced Monolithic Systems http://www.ams-semitech.com Application Examples AMS34063 (Continued) Line Regulation VIN=4.5V~6V @IO=100mA 20mV Load Regulation VIN=4.5V~6V @IO=100mA 100mV Fig.5 lnverting Converter Fig 6. Voltage lnverting Converter With PNP Saturated Switch 8 Advanced Monolithic Systems http://www.ams-semitech.com AMS34063 PACKAGE DESCRIPTION SOP8 PACKAGE OUTLINE DIMENSIONS 9 Advanced Monolithic Systems http://www.ams-semitech.com AMS34063 DIP8 PACKAGE OUTLINE DIMENSIONS 10 Advanced Monolithic Systems http://www.ams-semitech.com