Datasheet LT1076-5 (Analog Devices) - 3
| Fabricante | Analog Devices |
| Descripción | 5V Step-Down Switching Regulator |
| Páginas / Página | 8 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply … |
| Formato / tamaño de archivo | PDF / 116 Kb |
| Idioma del documento | Inglés |
ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply over the full operating
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LT1076-5
ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TJ = 25°C. VIN = 25V, unless otherwise noted. SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Current (Note 3) VOUT = 5.5V, VIN ≤ 40V l 8.5 11 mA 40V < VIN < 60V l 9.0 12 mA VSHDN = 0.1V (Device Shutdown) (Note 9) 140 300 μA Minimum Supply Voltage Normal Mode l 7.3 8.0 V Start-Up Mode (Note 4) l 3.5 4.8 V Switch Current Limit (Note 5) ILIM = Open l 2 2.6 3.2 A RLIM = 10k (Note 10) 1.8 A RLIM = 7k (Note 10) 1.2 A Maximum Duty Cycle l 85 90 % Switching Frequency 90 100 110 kHz TJ ≤ 125°C l 85 120 kHz VOUT = VSENSE = 0V (Note 5) 20 kHz Switching Frequency Line Regulation 8V ≤ VIN ≤ VMAX (Note 8) l 0.03 0.1 %/V Error Amplifi er Voltage Gain (Note 8) 1V ≤ VC ≤ 4V 2000 V/V Error Amplifi er Transconductance 3700 5000 8000 μmho (Note 8) Error Amplifi er Source and Sink Source (VSENSE = 4.5V) 100 140 225 μA Current Sink (VSENSE = 5.5V) 0.7 1.0 1.6 mA Sense Pin Divider Resistance 3 5 8 kΩ Sense Voltage VC = 2V l 4.85 5 5.15 V Output Voltage Tolerance VOUT (Nominal) = 5V ±0.5 ±2 % All Conditions of Input Voltage, Output Voltage, l ±1.0 ±3 % Temperature and Load Current Output Voltage Line Regulation 8V ≤ VIN ≤ VMAX (Note 7) l 0.005 0.02 %/V VC Voltage at 0% Duty Cycle 1.5 V Over Temperature l –4.0 mV/°C Multiplier Reference Voltage 24 V Shutdown Pin Current VSHDN = 5V 5 10 20 μA VSHDN ≤ VTHRESHOLD (≅ 2.5V) 50 μA Shutdown Thresholds Switch Duty Cycle = 0 2.2 2.45 2.7 V Fully Shut Down 0.1 0.30 0.5 V Thermal Resistance Junction to Case 4 °C/W
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings current limit testing, VSENSE is adjusted to give a minimum switch on time may cause permanent damage to the device. Exposure to any Absolute of 1ms. Maximum Rating condition for extended periods may affect device
Note 6:
Switch to input voltage limitation must also be observed. reliability and lifetime.
Note 7:
VMAX = 40V for the LT1076-5 and 60V for the LT1076HV-5.
Note 2:
To calculate maximum switch “on” voltage at currents between
Note 8:
Error amplifi er voltage gain and transconductance are low and high conditions, a linear interpolation may be used. specifi ed relative to the internal feedback node. To calculate gain and
Note 3:
A sense pin voltage (VSENSE) of 5.5V forces the VC pin to its low transconductance from the Sense pin (Output) to the VC pin, multiply by clamp level and the switch duty cycle to zero. This approximates the zero 0.44. load condition where duty cycle approaches zero.
Note 9:
Does not include switch leakage.
Note 4:
Total voltage from VIN pin to ground pin must be ≥ 8V after start- R − k 1 up for proper regulation. For T LIM A < 25°C, limit = 5V. ILIM ≈ k 5
Note 5:
Switch frequency is internally scaled down when the sense pin
Note 10:
voltage is less than 2.6V to avoid extremely short switch on times. During 10765fc 3
ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TJ = 25°C. VIN = 25V, unless otherwise noted. SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Current (Note 3) VOUT = 5.5V, VIN ≤ 40V l 8.5 11 mA 40V < VIN < 60V l 9.0 12 mA VSHDN = 0.1V (Device Shutdown) (Note 9) 140 300 μA Minimum Supply Voltage Normal Mode l 7.3 8.0 V Start-Up Mode (Note 4) l 3.5 4.8 V Switch Current Limit (Note 5) ILIM = Open l 2 2.6 3.2 A RLIM = 10k (Note 10) 1.8 A RLIM = 7k (Note 10) 1.2 A Maximum Duty Cycle l 85 90 % Switching Frequency 90 100 110 kHz TJ ≤ 125°C l 85 120 kHz VOUT = VSENSE = 0V (Note 5) 20 kHz Switching Frequency Line Regulation 8V ≤ VIN ≤ VMAX (Note 8) l 0.03 0.1 %/V Error Amplifi er Voltage Gain (Note 8) 1V ≤ VC ≤ 4V 2000 V/V Error Amplifi er Transconductance 3700 5000 8000 μmho (Note 8) Error Amplifi er Source and Sink Source (VSENSE = 4.5V) 100 140 225 μA Current Sink (VSENSE = 5.5V) 0.7 1.0 1.6 mA Sense Pin Divider Resistance 3 5 8 kΩ Sense Voltage VC = 2V l 4.85 5 5.15 V Output Voltage Tolerance VOUT (Nominal) = 5V ±0.5 ±2 % All Conditions of Input Voltage, Output Voltage, l ±1.0 ±3 % Temperature and Load Current Output Voltage Line Regulation 8V ≤ VIN ≤ VMAX (Note 7) l 0.005 0.02 %/V VC Voltage at 0% Duty Cycle 1.5 V Over Temperature l –4.0 mV/°C Multiplier Reference Voltage 24 V Shutdown Pin Current VSHDN = 5V 5 10 20 μA VSHDN ≤ VTHRESHOLD (≅ 2.5V) 50 μA Shutdown Thresholds Switch Duty Cycle = 0 2.2 2.45 2.7 V Fully Shut Down 0.1 0.30 0.5 V Thermal Resistance Junction to Case 4 °C/W
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings current limit testing, VSENSE is adjusted to give a minimum switch on time may cause permanent damage to the device. Exposure to any Absolute of 1ms. Maximum Rating condition for extended periods may affect device
Note 6:
Switch to input voltage limitation must also be observed. reliability and lifetime.
Note 7:
VMAX = 40V for the LT1076-5 and 60V for the LT1076HV-5.
Note 2:
To calculate maximum switch “on” voltage at currents between
Note 8:
Error amplifi er voltage gain and transconductance are low and high conditions, a linear interpolation may be used. specifi ed relative to the internal feedback node. To calculate gain and
Note 3:
A sense pin voltage (VSENSE) of 5.5V forces the VC pin to its low transconductance from the Sense pin (Output) to the VC pin, multiply by clamp level and the switch duty cycle to zero. This approximates the zero 0.44. load condition where duty cycle approaches zero.
Note 9:
Does not include switch leakage.
Note 4:
Total voltage from VIN pin to ground pin must be ≥ 8V after start- R − k 1 up for proper regulation. For T LIM A < 25°C, limit = 5V. ILIM ≈ k 5
Note 5:
Switch frequency is internally scaled down when the sense pin
Note 10:
voltage is less than 2.6V to avoid extremely short switch on times. During 10765fc 3