| ELECTRICAL CHARACTERISTICS(V = 5V, V - V = 5V, T = 0°C to +85°C, unless otherwise noted.)IN BST LX APARAMETER CONDITIONS MIN TYP MAX UNITS GENERAL Operating Input Voltage Range 3.0 5.5 V HSD Voltage Range (Note 1) 3.0 13.2 V Quiescent Supply Current V = 1.5V 1 2 mAFBV = V = 5.5V, V = 13.2V, LX = unconnected,IN BST HSD Standby Supply Current 2 mACOMP = GND Undervoltage-Lockout Trip Level Falling V , 50mV (typ) hysteresis 2.5 2.7 2.9 VIN DC-DC CONTROLLER Output-Voltage Adjust Range Maximum output voltage depends on external components 0.8 V (V ) and maximum duty cycleOUT ERROR AMPLIFIER FB Regulation Voltage -1.0 +0.8 +1.0 % Transconductance 70 110 160 µSVoltage Gain 200 V/ V FB Input Leakage Current V = 0.9V 50 500 NAFB FB Input Common-Mode Range -0.1 +1.5 V COMP Output-Voltage Swing 0.80 2.36 V Current-Sense Amplifier 3.15 3.5 3.85 V / V Voltage GainV = 0.8V 110 135 145FB Current-Limit Threshold V - V mVPGND LX V = 0V 21 36 51FB OSCILLATOR Switching Frequency MAX1954A 240 300 360 kHz Maximum Duty Cycle Measured at DH 89 91 93 % Minimum Duty Cycle V = 1.25V, LX = GND, V = V = 3.3V 2.5 3 % COMP BST IN 2 _______MAX1954AMAX1954ALow-Cost, Current-Mode PWM Buck Controller with Foldback Current LimitApplications Ordering InformationPrinters and Scanners PART TEMP RANGE PIN-PACKAGE Graphic Cards and Video CardsMAX1954AEUB -40°C to +85°C 10 µMAXPCs and ServersMicroprocessor CoresLow-Voltage Distributed PowerTelecom/NetworksPin ConfigurationTOP VIEWHSD 1 10 BSTCOMP 2 9 LXMAX1954AFB 3 8 DHGND 4 7 PGNDIN 5 6 DLµMAX____ Maxim Integrated Products 1For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at .EVALUATION KITAVAILABLELow-Cost, Current-Mode PWM Buck Controller with Foldback Current LimitABSOLUTE MAXIMUM RATINGSIN, FB to GND.....-0.3V to +6V Continuous Power Dissipation (T = +70°C)ALX to BST...-6V to +0.3V 10-Pin µMAX (derate 5.6mW/°C above +70°C) ..444mWBST to GND......-0.3V to +20V Operating Temperature Range -40°C to +85°CDH to LX...... -0.3V to (V + 0.3V) Junction Temperature+150°CBSTDL, COMP to GND...-0.3V to (V + 0.3V) Storage Temperature Range.+65°C to +150°CINHSD to GND........-0.3V to 14V Lead Temperature (soldering, 10s) ......+300°CPGND to GND .-0.3V to +0.3VStresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functionaloperation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure toabsolute maximum rating conditions for extended periods may affect device reliability. |
