Datasheet LT1528 (Analog Devices) - 3

LT1528
ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TJ = 25°C. PARAMETER CONDITIONS MIN TYP MAX UNITS
Dropout Voltage (Note 5) ILOAD = 100mA 150 200 mV ILOAD = 100mA l 250 mV ILOAD = 700mA 280 320 mV ILOAD = 700mA l 420 mV ILOAD = 1.5A 390 450 mV ILOAD = 1.5A l 600 mV ILOAD = 3A 570 670 mV ILOAD = 3A l 850 mV GND Pin Current (Note 6) ILOAD = 0mA 450 750 μA ILOAD = 0mA, TJ = 125°C (Note 7) 1.9 mA ILOAD = 100mA 1.2 2.5 mA ILOAD = 100mA, TJ = 125°C (Note 7) 2.7 mA ILOAD = 300mA 2.6 4.0 mA ILOAD = 300mA, TJ = 125°C (Note 7) 4.1 mA ILOAD = 700mA 7.3 12.0 mA ILOAD = 700mA, TJ = 125°C (Note 7) 8.8 mA ILOAD = 1.5A l 22 40 mA ILOAD = 3A l 85 140 mA SENSE Pin Current (Notes 4, 8) 90 130 250 μA SHDN Threshold VOUT = Off-to-On l 1.20 2.80 V VOUT = On-to-Off l 0.25 0.75 V SHDN Pin Current (Note 9) VSHDN = 0V l 37 100 μA Quiescent Current in Shutdown (Note 10) VIN = 6V, VSHDN = 0V l 110 220 μA Ripple Rejection VIN – VOUT = 1V(Avg), VRIPPLE = 0.5VP-P, 50 67 dB fRIPPLE = 120Hz, ILOAD = 1.5A Current Limit VIN – VOUT = 7V 4.5 A VIN = 4.3V, ΔVOUT = – 0.1V l 3.2 4.0 A Input Reverse Leakage Current VIN = – 15V, VOUT = 0V l 1.0 mA Reverse Output Current (Note 11) VOUT = 3.3V, VIN = 0V 120 250 μA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings maintain regulation at the specifi ed output current. In dropout the output may cause permanent damage to the device. Exposure to any Absolute voltage will be equal to: (VIN – VDROPOUT). Maximum Rating condition for extended periods may affect device
Note 6:
GND pin current is tested with VIN = VOUT (nominal) and a reliability and lifetime. current source load. This means that the device is tested while operating
Note 2:
The SHDN pin input voltage rating is required for a low in its dropout region. This is the worst-case GND pin current. The GND impedance source. Internal protection devices connected to the SHDN pin current will decrease slightly at higher input voltages. pin will turn on and clamp the pin to approximately 7V or – 0.6V. This
Note 7:
GND pin current will rise at TJ > 75°C. This is due to internal range allows the use of 5V logic devices to drive the pin directly. For circuitry designed to compensate for leakage currents in the output high impedance sources or logic running on supply voltages greater than transistor at high temperatures. This allows quiescent current to be 5.5V, the maximum current driven into the SHDN pin must be less than minimized at lower temperatures, yet maintain output regulation at high 5mA. temperatures with light loads. See quiescent current curve in typical
Note 3:
Operating conditions are limited by maximum junction performance characteristics section. temperature. The regulated output voltage specifi cation will not apply
Note 8:
SENSE pin current fl ows into the SENSE pin. for all possible combinations of input voltage and output current. When
Note 9:
SHDN pin current at VSHDN = 0V fl ows out of the SHDN pin. operating at maximum input voltage, the output current must be limited.
Note 10:
Quiescent current in shutdown is equal to the total sum of the When operating at maximum output current, the input voltage range SHDN pin current (40μA) and the GND pin current (70μA). must be limited.
Note 11:
Reverse output current is tested with the input pin grounded
Note 4:
The LT1528 is tested and specifi ed with the SENSE pin and the OUTPUT pin forced to the rated output voltage. This current connected to the OUTPUT pin. fl ows into the OUTPUT pin and out of the GND pin.
Note 5:
Dropout voltage is the minimum input/output voltage required to 1528fb 3