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LTC1626 Datasheet(PDF) 2 Page - Linear Technology |
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LTC1626 Datasheet(HTML) 2 Page - Linear Technology |
2 / 12 page 2 LTC1626 ABSOLUTE MAXIMUM RATINGS (Voltages Referred to GND Pin) Input Supply Voltage (Pins 1, 2, 13) ............– 0.3V to 7V Shutdown Input Voltage (Pin 10) ................– 0.3V to 7V Sense–, Sense+ (Pins 7, 8)........... – 0.3V to (VIN + 0.3V) LBO, LBI (Pins 3, 4) .................................... – 0.3V to 7V CT, ITH, VFB (Pins 5, 6, 9) ............. – 0.3V to (VIN + 0.3V) DC Switch Current (Pin 14) .................................... 1.2A Peak Switch Current (Pin 14) ................................. 1.6A Switch Voltage (Pin 14) .......(VIN – 7.5V) to (VIN + 0.3V) Operating Temperature Range ..................... 0 °C to 70°C Extended Commercial Operating Temperature Range (Note 4) ............. – 40 °C to 85°C Junction Temperature (Note 1) ............................. 125 °C Storage Temperature Range ................. – 65 °C to 150°C Lead Temperature (Soldering, 10 sec) .................. 300 °C PACKAGE/ORDER INFORMATION Consult factory for Industrial and Military grade parts. ORDER PART NUMBER TOP VIEW S PACKAGE 14-LEAD PLASTIC SO 1 2 3 4 5 6 7 14 13 12 11 10 9 8 PWR VIN VIN LBO LBI CT ITH SENSE– SW PWR VIN PGND SGND SHDN VFB SENSE+ LTC1626CS TJMAX = 125°C, θJA = 110°C/ W ELECTRICAL CHARACTERISTICS T A = 25°C, VIN = 4.5V, VOUT = 2.5V, VSHDN = 0V, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS IFB Feedback Pin Current 0.1 1 µA VFB Feedback Voltage 0 °C to 70°C q 1.22 1.25 1.28 V –40 °C to 85°C q 1.2 1.3 V ∆VOUT Output Voltage Line Regulation VIN = 3.5V to 5.5V, ILOAD = 250mA – 40 0 40 mV Output Voltage Load Regulation 10mA ≤ ILOAD ≤ 250mA 25 50 mV Burst Mode Output Ripple ILOAD = 0 50 mVP-P IQ Input DC Supply Current (Note 2) Active Mode q 1.9 3.0 mA Sleep Mode q 165 300 µA Shutdown VSHDN = VIN 0.5 5 µA VLBTRIP Low-Battery Trip Point 1.15 1.25 1.35 V ILBI Low-Battery Input Bias Current ±0.5 µA ILBO Low-Battery Output Sink Current VLBO = 0.4V 0.4 1.4 mA VSENSE Current Sense Threshold Voltage VSENSE – = 2.5V, VFB = VOUT/2 + 25mV (Forced) 25 mV VSENSE + – VSENSE– VSENSE – = 2.5V, VFB = VOUT/2 – 25mV (Forced) 130 155 180 mV RON ON Resistance of Switch 0.32 0.45 Ω tOFF Switch Off-Time (Note 3) CT = 390pF, ILOAD = 400mA 4 5 6 µs VIHSD SHDN Pin High Minimum Voltage for Device to Be Shut Down VIN – 0.4 V VILSD SHDN Pin Low Maximum Voltage for Device to Be Active 0.4 V IINSD SHDN Pin Input Current 0V ≤ VSHDN ≤ 7V q ±1 µA The q denotes specifications that apply over the specified operating temperature range. Note 1: TJ is calculated from the ambient temperature TA and power dissipation according to the following formula: TJ = TA + (PD • 110°C/W) Note 2: Dynamic supply current is higher due to the gate charge being delivered at the switching frequency. Note 3: In applications where RSENSE is placed at ground potential, the off-time increases by approximately 40%. Note 4: C grade device specifications are guaranteed over the 0 °C to 70°C temperature range. In addition, C grade device specifications are assured over the – 40 °C to 85°C temperature range by design or correlation, but are not production tested. |
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