Datasheet LT3667 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | 40V 400mA Step-Down Switching Regulator with Dual Fault Protected LDOs |
| Pages / Page | 34 / 5 — ELECTRICAL. CHARACTERISTICS The. denotes the specifications which apply … |
| File Format / Size | PDF / 446 Kb |
| Document Language | English |
ELECTRICAL. CHARACTERISTICS The. denotes the specifications which apply over the full operating
Model Line for this Datasheet
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LT3667
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN1 = 12V unless otherwise noted. (Note 4) PARAMETER CONDITIONS MIN TYP MAX UNITS
Reverse Output Current (Note 13) VOUT2 = 1.2V, VIN1 = VIN2 = VIN3 = 0V 5 40 µA VOUT3 = 1.2V, VIN1 = VIN2 = VIN3 = 0V 5 40 µA Input Reverse Leakage Current LDO2 VIN2 = –45V, VIN1 = VIN3 = VOUT2 = 0V l 300 µA Input Reverse Leakage Current LDO3 (QFN) VIN3 = –45V, VIN1 = VIN2 = VOUT3 = 0V l 300 µA Internal Current Limit (Note 12) VIN2 = 2.2V, VOUT2 = 0V, EN2/ILIM2 Pin Grounded 300 mA ∆VOUT2 = –5% l 220 mA VIN3 = 2.2V, VOUT3 = 0V, EN3/ILIM3 Pin Grounded 300 mA ∆VOUT3 = –5% l 220 mA Externally Programmed Current Limit REN/ILIM = 31.6k, VOUT2/3 = 5V, VIN2/3 ≥ 5.6V l 9.5 10 10.5 mA REN/ILIM = 6.19k, VOUT2/3 = 5V, VIN2/3 ≥ 5.6V l 47 51 55 mA REN/ILIM = 6.19k, VOUT2/3 = 5V, 5.6V ≤ VIN2/3 ≤ 15V l 48.45 51 53.55 mA REN/ILIM = 1.54k, VOUT2/3 = 5V, 5.6V ≤ VIN2/3 ≤ 15V l 176 197 230 mA LDO Disable Threshold VEN/ILIM Rising 0.9 1 1.2 V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 7:
Current limit guaranteed by design and/or correlation to static test. may cause permanent damage to the device. Exposure to any Absolute Slope compensation reduces current limit at higher duty cycles. Maximum Rating condition for extended periods may affect device
Note 8:
This is the minimum voltage across the boost capacitor needed to reliability and lifetime. guarantee full saturation of the switch.
Note 2:
Positive currents flow into pins, negative currents flow out of pins.
Note 9:
Dropout voltage is the minimum input-to-output voltage Minimum and maximum values refer to absolute values. differential needed for an LDO to maintain regulation at a specified output
Note 3:
Absolute maximum voltage at the IN1, UVLO1 and EN pins is 60V current. When an LDO is in dropout, its output voltage will be equal to for nonrepetitive 1 second transients, and 40V for continuous operation. VIN – VDROP.
Note 4:
The LT3667E is guaranteed to meet performance specifications
Note 10:
To satisfy minimum input voltage requirements, the LT3667 is from 0°C to 125°C junction temperature. Specifications over the −40°C tested and specified for these conditions with an external resistor divider to 125°C operating junction temperature range are assured by design, (80.6k bottom, 422k top) which sets VOUT to 5V. The external resistor characterization and correlation with statistical process controls. The divider adds 9.93μA of DC load on the output. This external current is not LT3667I is guaranteed over the full −40°C to 125°C operating junction factored into GND pin current. temperature range. The LT3667H is guaranteed over the full −40°C to
Note 11:
GND pin current is tested with VIN = VOUT(NOMINAL) + 0.6V and a 150°C operating junction temperature range. current source load. GND pin current increases in dropout.
Note 5:
This IC includes overtemperature protection that is intended
Note 12:
The LT3667 is tested and specified for these conditions with FB2 to protect the device during momentary overload conditions. Junction (FB3) pin connected to the OUT2 (OUT3) pin. temperature will exceed the maximum operating junction temperature
Note 13:
Reverse output current is tested with the IN2 (IN3) pin grounded when overtemperature protection is active. Continuous operation above and the OUT2 (OUT3) pin forced to the rated output voltage. This current the specified maximum operating junction temperature may impair device flows into the OUT2 (OUT3) pin and out of the GND pin. reliability.
Note 6:
This is the voltage necessary to keep the internal bias circuitry in regulation. 3667fb For more information www.linear.com/LT3667 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Order Information Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Revision History Typical Application Related Parts
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN1 = 12V unless otherwise noted. (Note 4) PARAMETER CONDITIONS MIN TYP MAX UNITS
Reverse Output Current (Note 13) VOUT2 = 1.2V, VIN1 = VIN2 = VIN3 = 0V 5 40 µA VOUT3 = 1.2V, VIN1 = VIN2 = VIN3 = 0V 5 40 µA Input Reverse Leakage Current LDO2 VIN2 = –45V, VIN1 = VIN3 = VOUT2 = 0V l 300 µA Input Reverse Leakage Current LDO3 (QFN) VIN3 = –45V, VIN1 = VIN2 = VOUT3 = 0V l 300 µA Internal Current Limit (Note 12) VIN2 = 2.2V, VOUT2 = 0V, EN2/ILIM2 Pin Grounded 300 mA ∆VOUT2 = –5% l 220 mA VIN3 = 2.2V, VOUT3 = 0V, EN3/ILIM3 Pin Grounded 300 mA ∆VOUT3 = –5% l 220 mA Externally Programmed Current Limit REN/ILIM = 31.6k, VOUT2/3 = 5V, VIN2/3 ≥ 5.6V l 9.5 10 10.5 mA REN/ILIM = 6.19k, VOUT2/3 = 5V, VIN2/3 ≥ 5.6V l 47 51 55 mA REN/ILIM = 6.19k, VOUT2/3 = 5V, 5.6V ≤ VIN2/3 ≤ 15V l 48.45 51 53.55 mA REN/ILIM = 1.54k, VOUT2/3 = 5V, 5.6V ≤ VIN2/3 ≤ 15V l 176 197 230 mA LDO Disable Threshold VEN/ILIM Rising 0.9 1 1.2 V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 7:
Current limit guaranteed by design and/or correlation to static test. may cause permanent damage to the device. Exposure to any Absolute Slope compensation reduces current limit at higher duty cycles. Maximum Rating condition for extended periods may affect device
Note 8:
This is the minimum voltage across the boost capacitor needed to reliability and lifetime. guarantee full saturation of the switch.
Note 2:
Positive currents flow into pins, negative currents flow out of pins.
Note 9:
Dropout voltage is the minimum input-to-output voltage Minimum and maximum values refer to absolute values. differential needed for an LDO to maintain regulation at a specified output
Note 3:
Absolute maximum voltage at the IN1, UVLO1 and EN pins is 60V current. When an LDO is in dropout, its output voltage will be equal to for nonrepetitive 1 second transients, and 40V for continuous operation. VIN – VDROP.
Note 4:
The LT3667E is guaranteed to meet performance specifications
Note 10:
To satisfy minimum input voltage requirements, the LT3667 is from 0°C to 125°C junction temperature. Specifications over the −40°C tested and specified for these conditions with an external resistor divider to 125°C operating junction temperature range are assured by design, (80.6k bottom, 422k top) which sets VOUT to 5V. The external resistor characterization and correlation with statistical process controls. The divider adds 9.93μA of DC load on the output. This external current is not LT3667I is guaranteed over the full −40°C to 125°C operating junction factored into GND pin current. temperature range. The LT3667H is guaranteed over the full −40°C to
Note 11:
GND pin current is tested with VIN = VOUT(NOMINAL) + 0.6V and a 150°C operating junction temperature range. current source load. GND pin current increases in dropout.
Note 5:
This IC includes overtemperature protection that is intended
Note 12:
The LT3667 is tested and specified for these conditions with FB2 to protect the device during momentary overload conditions. Junction (FB3) pin connected to the OUT2 (OUT3) pin. temperature will exceed the maximum operating junction temperature
Note 13:
Reverse output current is tested with the IN2 (IN3) pin grounded when overtemperature protection is active. Continuous operation above and the OUT2 (OUT3) pin forced to the rated output voltage. This current the specified maximum operating junction temperature may impair device flows into the OUT2 (OUT3) pin and out of the GND pin. reliability.
Note 6:
This is the voltage necessary to keep the internal bias circuitry in regulation. 3667fb For more information www.linear.com/LT3667 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Order Information Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Revision History Typical Application Related Parts
