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LTC1753 Fiches technique(PDF) 3 Page - Linear Technology |
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LTC1753 Fiches technique(HTML) 3 Page - Linear Technology |
3 / 24 page 3 LTC1753 Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: When IFB is taken below GND, it will be clamped by an internal diode. This pin can handle input currents greater than 100mA below GND without latchup. In the positive direction, it is not clamped to VCC or PVCC. Note 3: All currents into device pins are positive; all currents out of the device pins are negative. All voltages are referenced to ground unless otherwise specified. Note 4: The Power Good and FAULT trip thresholds are tested at the 1.8V output voltage code. The Power Good and FAULT trip thresholds are guaranteed by design for all other output voltage codes to the same specification. Note 5: The LTC1753 goes into the shutdown mode if VID0 to VID4 are floating. Due to the internal pull-up resistors, there will be an additional 0.25mA/pin if any of the VID0 to VID4 pins are pulled low. Note 6: Supply current in normal operation is dominated by the current needed to charge and discharge the external FET gates. This will vary with SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS GERR Error Amplifier Open-Loop DC Gain (Note 7) q 40 54 dB gmERR Error Amplifier Transconductance (Note 7) q 0.9 1.6 2.3 millimho BWERR Error Amplifier – 3dB Bandwidth COMP = Open (Note 11) 400 kHz IIMAX IMAX Sink Current VIMAX = VCC q 150 190 230 µA ISS Soft-Start Source Current VSS = 0V, VIMAX = 0V, VIFB = VCC q –16 – 12 – 8 µA ISSIL Maximum Soft-Start Sink Current VSENSE = VOUT, VIMAX = VCC, VIFB = 0V q 30 60 150 µA Under Current Limit (Notes 8, 9), VSS = VCC ISSHIL Soft-Start Sink Current Under Hard VSENSE = 0V, VIMAX = VCC, VIFB = 0V q 20 45 mA Current Limit tSSHIL Hard Current Limit Hold Time VSENSE = 0V, VIMAX = 4V, VIFB↓ from 5V 500 µs tPWRGD Power Good Response Time ↑ VSENSE↑ from 0V to Rated VOUT q 0.5 1 2 ms tPWRBAD Power Good Response Time ↓ VSENSE↓ from Rated VOUT to 0V q 200 500 1000 µs tFAULT FAULT Response Time VSENSE↑ from Rated VOUT to VCC q 200 500 1000 µs VOTDD Overtemperature Driver Disable OUTEN ↓, VID0 to VID4 = 0 (Note 10) (Figure 3) q 1.6 1.7 1.8 V VSHDN Shutdown OUTEN ↓, VID0 to VID4 = 0 (Note 10) (Figure 3) q 0.8 V tr, tf Driver Rise and Fall Time (Figure 4) q 90 150 ns tNOL Driver Nonoverlap Time (Figure 4) q 30 100 ns VIH VID0 to VID4 Input High Voltage q 2V VIL VID0 to VID4 Input Low Voltage q 0.8 V RSENSE SENSE Input Resistance 108 k Ω RVID VID0 to VID4 Internal Pull-Up q 10 20 k Ω Resistance ISINK Digital Output Sink Current q 10 mA the LTC1753 operating frequency, supply voltage and the external FETs used. Note 7: The open-loop DC gain and transconductance from the SENSE pin to COMP pin will be (GERR)(1.26/3.3) and (gmERR)(1.26/3.3) respectively. Note 8: The current limiting amplifier can sink but cannot source current. Under normal (not current limited) operation, the output current will be zero. Note 9: Under typical soft current limit, the net soft-start discharge current will be 60 µA (ISSIL) + [–12µA(ISS)] ≅ 48µA. The soft-start sink-to-source current ratio is designed to be 5:1. Note 10: When VID0 to VID4 are all HIGH, the LTC1753 will be forced to shut down internally. The OUTEN trip voltages are guaranteed by design for all other input codes. Note 11: This parameter is guaranteed by design and correlation and is not tested in production. ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 5V, PVCC = 12V, unless otherwise noted. (Note 3) |
Numéro de pièce similaire - LTC1753 |
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Description similaire - LTC1753 |
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