Datasheet LT3682 (Analog Devices) - 3
| Hersteller | Analog Devices |
| Beschreibung | 1A Micropower Step-Down Switching Regulator |
| Seiten / Seite | 24 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes specifi cations which apply over … |
| Dateiformat / Größe | PDF / 265 Kb |
| Dokumentensprache | Englisch |
ELECTRICAL CHARACTERISTICS. The. denotes specifi cations which apply over the full operating temperature
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LT3682
ELECTRICAL CHARACTERISTICS The
l
denotes specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C, VIN = 10V, VRUN/SS = 10V, VBD = 3.3V unless otherwise noted. (Note 3) PARAMETER CONDITIONS MIN TYP MAX UNITS
VC Source Current 50 μA VC Sink Current 50 μA VC Pin to Switch Current Gain 1.25 A/V VC Switching Threshold 0.5 0.6 0.7 V VC Clamp Voltage 2 V Switching Frequency RRT = 8.06kΩ 1.98 2.2 2.42 MHz RRT = 29.4kΩ 0.9 1 1.1 MHz RRT = 158kΩ 225 250 275 kHz Minimum Switch Off-Time l 130 210 ns Switch Current Limit (Note 7) SYNC = 0V 1.45 1.7 2 A SYNC = 3.3V or Clocked 1.18 1.4 1.66 A Switch VCESAT ISW = 1A 460 mV DA Pin Current to Stop OSC 1.25 1.6 1.95 A Switch Leakage Current VSW = 0V, VIN = 60V 0.01 1 μA Boost Schottky Diode Voltage Drop IBSD = 50mA 720 850 mV Boost Schottky Diode Reverse Leakage VSW = 10V, VBD = 0 0.1 1 μA Minimum Boost Voltage (Note 5) l 1.7 2.5 V BOOST Pin Current ISW = 0.5A 10.5 17.5 mA RUN/SS Pin Current VRUN/SS = 10V 12 20 μA RUN/SS Input Voltage High 2.5 V RUN/SS Input Voltage Low 0.2 V PG Leakage Current VPG = 5V 0.1 1 μA PG Sink Current VPG = 0.4V l 100 1000 μA PG Threshold as % of VFB Measured at FB pin. FB Pin Voltage Rising 88% 90% 92% V PG Threshold Hysteresis Measured at FB Pin 12 mV SYNC Threshold Voltage 300 550 800 mV SYNC Input Frequency 0.3 2.2 MHz
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 4:
Bias current fl ows out of the FB pin. may cause permanent damage to the device. Exposure to any Absolute
Note 5:
This is the minimum voltage across the boost capacitor needed to Maximum Rating condition for extended periods may affect the device guarantee full saturation of the switch. reliability and lifetime.
Note 6:
This IC includes over-temperature protection that is intended
Note 2:
Absolute Maximum Voltage at VIN and RUN/SS pins is 60V for to protect the device during momentary overload conditions. Junction nonrepetitive 1 second transients, and 36V for continuous operation. temperature will exceed the maximum operating junction temperature
Note 3:
The LT3682E is guaranteed to meet performance specifi cations from when over-temperature protection is active. Continuous operation above 0°C to 125°C junction temperature. Specifi cations over the −40°C to 125°C the specifi ed maximum operating junction temperature may impair device operating junction temperature range are assured by design, characterization reliability. and correlation with statistical process controls. The LT3682I is guaranteed
Note 7:
Current limit guaranteed by design and/or correlation to static test. over the full −40°C to 125°C operating junction temperature range. Slope compensation reduces current limit at higher duty cycles. 3682f 3
ELECTRICAL CHARACTERISTICS The
l
denotes specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C, VIN = 10V, VRUN/SS = 10V, VBD = 3.3V unless otherwise noted. (Note 3) PARAMETER CONDITIONS MIN TYP MAX UNITS
VC Source Current 50 μA VC Sink Current 50 μA VC Pin to Switch Current Gain 1.25 A/V VC Switching Threshold 0.5 0.6 0.7 V VC Clamp Voltage 2 V Switching Frequency RRT = 8.06kΩ 1.98 2.2 2.42 MHz RRT = 29.4kΩ 0.9 1 1.1 MHz RRT = 158kΩ 225 250 275 kHz Minimum Switch Off-Time l 130 210 ns Switch Current Limit (Note 7) SYNC = 0V 1.45 1.7 2 A SYNC = 3.3V or Clocked 1.18 1.4 1.66 A Switch VCESAT ISW = 1A 460 mV DA Pin Current to Stop OSC 1.25 1.6 1.95 A Switch Leakage Current VSW = 0V, VIN = 60V 0.01 1 μA Boost Schottky Diode Voltage Drop IBSD = 50mA 720 850 mV Boost Schottky Diode Reverse Leakage VSW = 10V, VBD = 0 0.1 1 μA Minimum Boost Voltage (Note 5) l 1.7 2.5 V BOOST Pin Current ISW = 0.5A 10.5 17.5 mA RUN/SS Pin Current VRUN/SS = 10V 12 20 μA RUN/SS Input Voltage High 2.5 V RUN/SS Input Voltage Low 0.2 V PG Leakage Current VPG = 5V 0.1 1 μA PG Sink Current VPG = 0.4V l 100 1000 μA PG Threshold as % of VFB Measured at FB pin. FB Pin Voltage Rising 88% 90% 92% V PG Threshold Hysteresis Measured at FB Pin 12 mV SYNC Threshold Voltage 300 550 800 mV SYNC Input Frequency 0.3 2.2 MHz
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 4:
Bias current fl ows out of the FB pin. may cause permanent damage to the device. Exposure to any Absolute
Note 5:
This is the minimum voltage across the boost capacitor needed to Maximum Rating condition for extended periods may affect the device guarantee full saturation of the switch. reliability and lifetime.
Note 6:
This IC includes over-temperature protection that is intended
Note 2:
Absolute Maximum Voltage at VIN and RUN/SS pins is 60V for to protect the device during momentary overload conditions. Junction nonrepetitive 1 second transients, and 36V for continuous operation. temperature will exceed the maximum operating junction temperature
Note 3:
The LT3682E is guaranteed to meet performance specifi cations from when over-temperature protection is active. Continuous operation above 0°C to 125°C junction temperature. Specifi cations over the −40°C to 125°C the specifi ed maximum operating junction temperature may impair device operating junction temperature range are assured by design, characterization reliability. and correlation with statistical process controls. The LT3682I is guaranteed
Note 7:
Current limit guaranteed by design and/or correlation to static test. over the full −40°C to 125°C operating junction temperature range. Slope compensation reduces current limit at higher duty cycles. 3682f 3