ML34063 ML34063 DC-to-DC Converter Control Circuit Application Features Battery Powered Equipment Palmtops Video Recorders General Description Operating Voltage from 3V to 35V Low Standby Current Output Switch Current up to 1.5A Output Voltage Adjustable Operating Frequency at 100KHz 2% Accuracy Voltage Reference PackageAvailable: PDIP-8 (1.25W) & SO-8 (625mW) Block Diagram The ML34063 is a DC/DC converter. It consists of an internal temperature compensated voltage reference, comparator, controlled duty cycle oscillator with an active current limit circuit, driver and high current output switch. It can be used in step-down, step-up and voltage-inverting applications with a minimum number of external components. Driver 8 Collector (DRIC) 1 Switch Collector (SC) Q S R 2 Switch Emitter (SE) 7 Ipk 3 CT Ipk Sense (IPK) Timing Capacitor (CT) Oscillator 6 VCC + 1.25V Voltage Reference Comparator 4 GND Comparator 5 Inverting Input (CII) Ordering Information Part Number Package ML34063NG PDIP-8 (PB Free) ML34063MG SO-8 (PB Free) ML34063N PDIP-8 ML34063M SO-8 Pin Configuration Switch Collector (SC) 1 8 Driver Collector (DRIC) Switch Emitter (SE) 2 7 Ipk Sense (IPK) Timing Capacitor (CT) 3 6 VCC GND 4 5 Comparator Inverting Input (CII) ML34063 (Top View) P1/5 Rev B, June 2005 ML34063 Absolute Maximum Ratings Parameter Input Voltage Comparator Input Voltage Range Switch Collector Voltage Switch Emitter Voltage (VPin 1 = 35V) Switch Collector to Emitter Voltage Drive Collector Voltage Switch Collector Current Switch Current PDIP-8 Power Dissipation at o TA = 25 C SO-8 Thermal Resistance Symbol VIN VIR VC(Switch) VE(Switch) VCE(Switch) VC(Drive) IC(Switch) ISW Ratings 35 -0.3 to 35 35 35 35 35 100 1.5 1250 Pd Units V V V V V V mA A mW 625 PDIP-8 100 SO-8 160 -0 ~ +70 -65 ~ +150 Operating Ambient Temperature Storage Temperature Topr Tstg o C/W o C C o Electrical Characteristics (VCC = 5V, TA = 25OC, CT = 1nF, unless otherwise specified.) Oscillator Parameter Frequency Charge Current Discharge Current Discharge to Charge Current Ratio Current Limit Sense Voltage Symbol fOSC Ichg Idichg Idischg/Ichg Vipk(sense) Conditions VPin 5 = 0V VCC = 5.0V to 35V VCC = 5.0V to 35V Pin 7 to VCC, Ichg = Idischg Min 24 24 140 5.2 250 Typ 33 35 220 6.5 300 Max 42 42 260 7.5 350 Units kHz uA uA Min Typ Max Units 1.0 1.3 V 0.45 0.7 V 75 0.01 100 uA Min 1.225 Typ 1.25 Max 1.275 Units V Min Typ Max Units 4.0 mA mV Output Switch (Note1) Parameter Saturation Voltage, Darlington Connection Symbol VCE(sat) Saturation Voltage (Note 6) VCE(sat) DC Current Gain Collector Off-State Current hFE IC(off) Conditions ISW = 1.0A, Pins 1, 8 connected ISW = 1.0A, RPin 8 = 82 ohm to VCC, ISW = 1.0A, VCE = 5.0V VCE = 35V 50 Comparator Parameter Threshold Voltage Symbol Vth Conditions Total Device Parameter Supply Current Symbol Icc Conditions VCC = 5.0V to 35V, Pin 7 = VCC,, Vpin5 > Vth,, Pin2 = GND, remaining pins open Note : 1. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperatures possible. P2/5 Rev B, June 2005 ML34063 Step-Up Converter Application Circuit 170uH 180 ohm 8 1 DRIC S SC Q R 2 SE 7 Ipk 3 CT IPK CT 1500pF Oscillator 0.22 ohm 6 VIN = 12V + VCC 1N5819 100uF + 1.25V Voltage Reference Comparator 4 5 GND 1.0uH CII ML34063 (Bottom View) 2.2k ohm Test VOUT = 28V/175mA + 47k ohm 330uF VOUT + Optional Low Pass Filter Conditions Results Line Regulation Vin = 8.0V to 16V, IO = 175mA 30mV + 0.05% Load Regulation Vin = 12V, IO = 75mA to 175mA 10mV + 0.017% Output Ripple Vin = 12V, IO = 175mA 400 mVpp Efficient Vin = 12V, IO = 175mA 87.7% Output Ripple with Optional Filter Vin = 12V, IO = 175mA 40 mVpp P3/5 100uF Rev B, June 2005 ML34063 Step-Down Converter Application Circuit 8 1 DRIC S SC Q R 2 SE 1N5819 7 Ipk 3 CT IPK CT 470pF Oscillator 0.33 ohm 6 VIN = 25V + VCC 100uF + 1.25V Voltage Reference 220uH Comparator 4 5 GND 1.0uH CII ML34063 (Bottom View) 1.2k ohm + 3.6k ohm Test 470uF VOUT = 5.0V/500mA VOUT + Optional Low Pass Filter Conditions Results Line Regulation Vin = 15V to 25V, IO = 500mA 12mV + 0.12% Load Regulation Vin = 25V, IO = 50mA to 500mA 3.0mV + 0.03% Output Ripple Vin = 25V, IO = 500mA 120 mVpp Short Circuit Current Vin = 25V, RL = 0.1 ohm 1.1A Efficient Vin = 25V, IO = 500mA 83.7% Output Ripple with Optional Filter Vin = 25V, IO = 500mA 40 mVpp P4/5 100uF Rev B, June 2005 ML34063 Voltage Inverting Converter Application Circuit 8 1 DRIC S SC Q R 2 SE 88uH 7 Ipk 3 CT IPK CT Oscillator 0.24 ohm VIN = 4.5V~6.0V 100uF 6 + 1500pF VCC + 1N5819 1.25V Voltage Reference Comparator 4 5 GND 1.0uH CII ML34063 (Bottom View) 8.2k ohm VOUT = -12V/100mA 953 ohm 1000uF + Test VOUT Optional Low Pass Filter Conditions 100uF + Results Line Regulation Vin = 4.5V to 6.0V, IO = 100mA 3.0mV + 0.012% Load Regulation Vin = 5.0V, IO = 10mA to 100mA 0.022V + 0.09% Output Ripple Vin = 5.0V, IO = 100mA 500 mVpp Short Circuit Current Vin = 5.0V, RL = 0.1 ohm 910 mA Efficient Vin = 5.0V, IO = 100mA 62.2% Output Ripple with Optional Filter Vin = 5.0V, IO = 100mA 70 mVpp 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. No liability will be accepted by the publisher for any consequence of its use. P5/5 Rev B, June 2005