Datasheet LT1073 (Analog Devices) - 2

LT1073
ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1)
Supply Voltage, Step-Up Mode ...15V ORDER PART Supply Voltage, Step-Down Mode ..36V NUMBER SW1 Pin Voltage ...50V TOP VIEW LT1073CN8 SW2 Pin Voltage ..–0.4 to V ILIM 1 FB (SENSE)* IN 8 LT1073CN8-5 Feedback Pin Voltage (LT1073) ...5V VIN 2 7 SET LT1073CN8-12 Switch Current ...1.5A SW1 3 6 A0 LT1073CS8 Maximum Power Dissipation ... 500mW SW2 4 5 GND LT1073CS8-5 Operating Temperature Range ... 0°C to 70°C N8 PACKAGE S8 PACKAGE LT1073CS8-12 Storage Temperature Range .. –65°C to 150°C 8-LEAD PDIP 8-LEAD PLASTIC SO *FIXED VERSIONS Lead Temperature (Soldering, 10 sec) ...300°C S8 PART MARKING TJMAX = 125°C, θJA = 100°C/W (N8) T 1073 JMAX = 125°C, θJA = 120°C/W (S8) 10735 107312 Consult factory for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 1.5V unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IQ Quiescent Current Switch Off l 95 130 µA IQ Quiescent Current, Step-Up No Load LT1073-5 135 µA Mode Configuration LT1073-12 250 µA VIN Input Voltage Step-Up Mode l 1.15 12.6 V 1.0 12.6 V Step-Down Mode l 30 V Comparator Trip Point Voltage LT1073 (Note 2) l 202 212 222 mV VOUT Output Sense Voltage LT1073-5 (Note 3) l 4.75 5 5.25 V LT1073-12 (Note 3) l 11.4 12 12.6 V Comparator Hysteresis LT1073 l 5 10 mV Output Hysteresis LT1073-5 l 125 250 mV LT1073-12 l 300 600 mV fOSC Oscillator Frequency l 15 19 23 kHz DC Duty Cycle Full Load (VFB = VREF) l 65 72 80 % tON Switch ON Time l 30 38 50 µs IFB Feedback Pin Bias Current LT1073, VFB = 0V l 10 50 nA ISET Set Pin Bias Current VSET = VREF l 60 120 nA VAO AO Output Low IAO = –100µA l 0.15 0.4 V Reference Line Regulation 1V ≤ VIN ≤ 1.5V l 0.35 1.0 %V 1.5V ≤ VIN ≤ 12V l 0.05 0.1 %V VCESAT Switch Saturation Voltage VIN = 1.5V, ISW = 400mA 300 400 mV Set-Up Mode l 600 mV VIN = 1.5V, ISW = 500mA 400 550 mV l 750 mV VIN = 5V, ISW = 1A 700 1000 mV l 1500 mV AV A2 Error Amp Gain RL = 100kΩ (Note 4) l 400 1000 V/V Rev B 2 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagrams Operation Applications Information Typical Applications Package Description Typical Application Related Parts