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| ML34063 ML34063 DC-to-DC Converter Control Circuit Application Battery Powered Equipment Palmtops Video Recorders Features Operating V oltage from 3V to 35V Low Standby Current Output Switch Current up to 1.5A Output V oltage Adjustable Operating Frequency at 100KHz 2% Accuracy V oltage Reference PackageAvailable: PDIP-8 (1.25W) & SO-8 (625mW) General Description 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. Block Diagram Driver 8 Collector (DRIC) S Q 1 Switch Collector (SC) R 2 Switch Emitter (SE) 7 Ipk Sense (IPK) Ipk CT 3 Timing Capacitor (CT) Oscillator 6 VCC 1.25V Voltage Reference + Comparator 4 Comparator 5 Inverting Input (CII) GND Ordering Information Part Number ML34063NG ML34063MG ML34063N ML34063M Package PDIP-8 (PB Free) SO-8 (PB Free) PDIP-8 Pin Configuration Switch Collector (SC) Switch Emitter (SE) 1 2 8 7 Driver Collector (DRIC) Ipk Sense (IPK) VCC Comparator Inverting Input (CII) Timing Capacitor (CT) GND 3 4 6 5 SO-8 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 Operating Ambient Temperature Storage Temperature PDIP-8 SO-8 Topr Tstg Symbol VIN VIR VC(Switch) VE(Switch) VCE(Switch) VC(Drive) IC(Switch) ISW Pd Ratings 35 -0.3 to 35 35 35 35 35 100 1.5 1250 625 100 160 -0 ~ +70 -65 ~ +150 Units V V V V V V mA A mW o C/W o o C C 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 mV Output Switch (Note1) Parameter Saturation Voltage, Darlington Connection Saturation Voltage (Note 6) DC Current Gain Collector Off-State Current Symbol VCE(sat) VCE(sat) 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 Min Typ 1.0 0.45 75 0.01 Max 1.3 0.7 100 Units V V uA Comparator Parameter Threshold Voltage Symbol Vth Conditions Min 1.225 Typ 1.25 Max 1.275 Units V Total Device Parameter Supply Current Symbol Icc Conditions VCC = 5.0V to 35V, Pin 7 = VCC,, Vpin5 > Vth,, Pin2 = GND, remaining pins open Min Typ Max 4.0 Units mA 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 S Q 1 SC DRIC R 2 SE 7 IPK 0.22 ohm 6 + 100uF VCC Ipk CT 3 CT Oscillator 1500pF VIN = 12V 1N5819 1.25V Voltage Reference + Comparator 4 5 CII ML34063 (Bottom View) + 330uF VOUT = 28V/175mA Optional Low Pass Filter VOUT + 100uF GND 1.0uH 2.2k ohm 47k ohm Test Line Regulation Load Regulation Output Ripple Efficient Output Ripple with Optional Filter Conditions Vin = 8.0V to 16V, IO = 175mA Vin = 12V, IO = 75mA to 175mA Vin = 12V, IO = 175mA Vin = 12V, IO = 175mA Vin = 12V, IO = 175mA Results 30mV + 0.05% 10mV + 0.017% 400 mVpp 87.7% 40 mVpp P3/5 Rev B, June 2005 ML34063 Step-Down Converter Application Circuit 8 DRIC S Q SC 1 R 2 SE 1N5819 7 IPK 0.33 ohm 6 + 100uF + Comparator 4 5 CII ML34063 (Bottom View) + 470uF VOUT = 5.0V/500mA Optional Low Pass Filter VOUT + 100uF GND 1.0uH 1.25V Voltage Reference 220uH VCC Oscillator Ipk CT 3 CT 470pF VIN = 25V 1.2k ohm 3.6k ohm Test Line Regulation Load Regulation Output Ripple Short Circuit Current Efficient Output Ripple with Optional Filter Conditions Vin = 15V to 25V, IO = 500mA Vin = 25V, IO = 50mA to 500mA Vin = 25V, IO = 500mA Vin = 25V, RL = 0.1 ohm Vin = 25V, IO = 500mA Vin = 25V, IO = 500mA Results 12mV + 0.12% 3.0mV + 0.03% 120 mVpp 1.1A 83.7% 40 mVpp P4/5 Rev B, June 2005 ML34063 Voltage Inverting Converter Application Circuit 8 DRIC S Q 1 SC R 2 SE 88uH 7 IPK 0.24 ohm 6 + VCC 1N5819 Oscillator 1500pF Ipk CT 3 CT VIN = 4.5V~6.0V 100uF + Comparator 1.25V Voltage Reference 4 5 CII ML34063 (Bottom View) VOUT = -12V/100mA 1000uF + Optional Low Pass Filter + VOUT 100uF GND 1.0uH 8.2k ohm 953 ohm Test Line Regulation Load Regulation Output Ripple Short Circuit Current Efficient Output Ripple with Optional Filter Conditions Vin = 4.5V to 6.0V, IO = 100mA Vin = 5.0V, IO = 10mA to 100mA Vin = 5.0V, IO = 100mA Vin = 5.0V, RL = 0.1 ohm Vin = 5.0V, IO = 100mA Vin = 5.0V, IO = 100mA Results 3.0mV + 0.012% 0.022V + 0.09% 500 mVpp 910 mA 62.2% 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 |
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