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LTC1421 Datasheet(PDF) 3 Page - Linear Technology |
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LTC1421 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 24 page  3 LTC1421/LTC1421-2.5 ELECTRICAL CHARACTERISTICS V CCHI = 12V, VCCLO = 5V, TA = 25°C unless otherwise noted (Note 2). Note 3: After power-on reset, the VOUTLO and VOUTHI have to drop below the VTRIP point before the charge pump is restarted. Note 4: After power-on reset, the VOUTLO has to drop below the VTRIP point before the charge pump is restarted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS IRAMP RAMP Pin Output Current Charge Pump On, VRAMP = 0.4V q 11 17 23 µA ICP Charge Pump Output Current Charge Pump On, GATEHI = 0V – 600 µA GATELO = 0V – 300 µA ∆VGATEHI GATEHI N-Channel Gate Drive VGATEHI − VOUTHI 616 V ∆VGATELO GATELO N-Channel Gate Drive VGATELO − VOUTLO 10 16 V VAUXVCC Auxiliary VCC Output Voltage VCCLO = 5V, Unloaded 4.5 V VIL Input Low Voltage CON1, CON2, POR q 0.8 V VIH Input High Voltage CON1, CON2, POR q 2V IIN Input Current CON1, CON2, POR = GND q –30 – 60 –90 µA VOL Output Low Voltage RESET, COMPOUT, PWRGD, DISABLE, FAULT, q 0.4 V IO = 3mA CPON, IO = 3mA q 1.45 V VOH Output High Voltage DISABLE, IO = – 3mA q 4V CPON, IO = – 1mA q 3.4 V IPU Logic Output Pull-Up Current RESET, PWRGD, FAULT = GND – 15 µA AC CHARACTERISTICS t1 CON1 or CON2 ↓to CPON↑ Figure 1, CL = 15pF q 15 20 30 ms t2 PWRGD ↑ to RESET↑ Figure 1, RL = 10k to VCCLO, CL = 15pF 160 200 240 ms q 140 200 280 ms t3 PWRGD ↑ to DISABLE↓ Figure 1, CL = 15pF 160 200 240 ms q 140 200 280 ms t4 POR ↓to CPON↓ Figure 1, CL = 15pF q 15 20 30 ms t5 PWRGD ↓to RESET↓ Figure 1, RL = 10k to VCCLO, CL = 15pF 32 µs t6 POR ↑to CPON↑ Figure 1, CL = 15pF 50 ns t7 CON1 or CON2 ↑ to CPON↓ Figure 1, CL = 15pF 50 ns t9 Short-Circuit Detect to FAULT ↓ Figure 1, RL = 10k to VCCLO, CL = 15pF 20 µs VCCLO – SETLO = 0mV to 100mV t10 Short-Circuit Detect to CPON ↓ Figure 2, CL = 15pF 20 µs VCCLO – SETLO = 0mV to 100mV t11 POR ↑ to FAULT↑ Figure 2, RL = 10k to VCCLO, CL = 15pF 20 ns tCHL Comparator High to Low COMP – = 1.232V, 10mV Overdrive q 0.25 0.5 µs RL = 10k to VCCLO, CL = 15pF tCLH Comparator Low to High COMP – = 1.232V, 10mV Overdrive q 1 1.5 µs RL = 10k to VCCLO, CL = 15pF The q denotes specifications which apply over the full operating temperature range. Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: All currents into device pins are positive; all currents out of device pins are negative. All voltages are reference to ground unless otherwise specified. |
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