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LT1578CS8-2.5 Datasheet(PDF) 2 Page - Linear Technology |
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LT1578CS8-2.5 Datasheet(HTML) 2 Page - Linear Technology |
2 / 28 page 2 LT1578/LT1578-2.5 PARAMETER CONDITIONS MIN TYP MAX UNITS Feedback Voltage 1.195 1.21 1.225 V All Conditions q 1.18 1.24 V Sense Voltage (Fixed 2.5) 2.46 2.5 2.54 V All Conditions q 2.44 2.56 V Sense Pin Resistance 5.7 9.5 13.7 k Ω Reference Voltage Line Regulation 4.3V ≤ VIN ≤ 15V q 0.01 0.03 %/V Feedback Input Bias Current q 0.5 2 µA Error Amplifier Voltage Gain (Notes 2, 10) 200 400 Error Amplifier Transconductance (Note 10) ∆I (VC) = ±10µA 800 1050 1300 µMho q 400 1700 µMho VC Pin to Switch Current Transconductance 1.5 A/ V Error Amplifier Source Current VFB = 1.1V q 40 110 190 µA Error Amplifier Sink Current VFB = 1.4V q 50 130 200 µA VC Pin Switching Threshold Duty Cycle = 0 0.8 V VC Pin High Clamp 2.1 V Switch Current Limit VC Open, VFB = 1.1V, DC ≤ 50% q 1.5 2 3.5 A Slope Compensation (Note 8) DC = 80% 0.3 A Switch On Resistance (Note 7) ISW = 1.5A 0.2 0.35 Ω q 0.45 Ω Maximum Switch Duty Cycle VFB = 1.1V 90 94 % q 86 94 % Minimum Switch Duty Cycle (Note 9) 8% Switch Frequency VC Set to Give 50% Duty Cycle 180 200 220 kHz q 160 240 kHz Switch Frequency Line Regulation 4.3V ≤ VIN ≤ 15V q 0 0.15 %/ V Frequency Shifting Threshold on FB Pin ∆f = 10kHz q 0.4 0.74 1.0 V Minimum Input Voltage (Note 3) q 4.0 4.3 V Minimum Boost Voltage (Note 4) ISW ≤ 1.5A q 2.3 3.0 V ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1) Input Voltage .......................................................... 16V BOOST Pin Above Input Voltage ............................. 10V SHDN Pin Voltage ..................................................... 7V SENSE Pin Voltage .................................................... 4V FB Pin Voltage (Adjustable Part) ............................ 3.5V FB Pin Current (Adjustable Part) ............................ 1mA SYNC Pin Voltage ..................................................... 7V Operating Junction Temperature Range LT1578C ............................................... 0 °C to 125° C LT1578I ........................................... – 40 °C to 125°C Storage Temperature Range ................ – 65 °C to 150°C Lead Temperature (Soldering, 10 sec)................. 300 °C The q denotes specifications which apply over the full operating tempera- ture range, otherwise specifications are at TJ = 25°C. VIN = 5V, VC = 1.5V, Boost = VIN + 5V, switch open, unless otherwise noted. ELECTRICAL CHARACTERISTICS Consult factory for Military grade parts. ORDER PART NUMBER LT1578CS8 LT1578IS8 LT1578CS8-2.5 LT1578IS8-2.5 S8 PART MARKING 1578 1578I 1 2 3 4 8 7 6 5 TOP VIEW S8 PACKAGE 8-LEAD PLASTIC SO VSW VIN BOOST GND SHDN FB/SENSE VC SYNC θJA =80°C/ W WITH FUSED GROUND PIN CONNECTED TO GROUND PLANE OR LARGE LANDS 157825 578I25 |
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