Datasheet LT1074, LT1076 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | Step-Down Switching Regulator |
| Pages / Page | 16 / 3 — ELECTRICAL CHARACTERISTICS The |
| File Format / Size | PDF / 189 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS The
Model Line for this Datasheet
- LT1074CT#06PBF LT1074CT#30PBF LT1074CT#PBF LT1074CT7#06PBF LT1074CT7#PBF LT1074HVCT#06PBF LT1074HVCT#PBF LT1074HVCT7#06PBF LT1074HVCT7#PBF LT1074HVIT#06PBF LT1074HVIT#30PBF LT1074HVIT#PBF LT1074HVIT7#06PBF LT1074HVIT7#35PBF LT1074HVIT7#PBF LT1074IT#06PBF LT1074IT#PBF LT1074IT7#PBF
- LT1076CQ#PBF LT1076CQ#TRPBF LT1076CR#PBF LT1076CR#TRPBF LT1076CT#06PBF LT1076CT#30PBF LT1076CT#PBF LT1076CT7#PBF LT1076HVCR#PBF LT1076HVCR#TRPBF LT1076HVCT#06PBF LT1076HVCT#PBF LT1076HVCT7#PBF LT1076HVIR#PBF LT1076HVIR#TRPBF LT1076HVIT#06PBF LT1076HVIT#PBF LT1076IQ#PBF LT1076IQ#TRPBF LT1076IR#PBF LT1076IR#TRPBF LT1076IT#06PBF LT1076IT#PBF
Text Version of Document
LT1074/LT1076
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. Tj = 25
°
C, VIN = 25V, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
Switch “On” Voltage (Note 2) LT1074 ISW = 1A, Tj ≥ 0°C 1.85 V ISW = 1A, Tj < 0°C 2.1 V ISW = 5A, Tj ≥ 0°C 2.3 V ISW = 5A, Tj < 0°C 2.5 V LT1076 ISW = 0.5A ● 1.2 V ISW = 2A ● 1.7 V Switch “Off” Leakage LT1074 VIN ≤ 25V, VSW = 0 5 300 µA VIN = VMAX, VSW = 0 (Note 8) 10 500 µA LT1076 VIN = 25V, VSW = 0 150 µA VIN = VMAX, VSW = 0 (Note 8) 250 µA Supply Current (Note 3) VFB = 2.5V, VIN ≤ 40V ● 8.5 11 mA 40V < VIN < 60V ● 9 12 mA VSHUT = 0.1V (Device Shutdown) (Note 9) ● 140 300 µA Minimum Supply Voltage Normal Mode ● 7.3 8 V Startup Mode (Note 4) ● 3.5 4.8 V Switch Current Limit (Note 5) LT1074 ILIM Open ● 5.5 6.5 8.5 A RLIM = 10k (Note 6) 4.5 A RLIM = 7k (Note 6) 3 A LT1076 ILIM Open ● 2 2.6 3.2 A RLIM = 10k (Note 6) 1.8 A RLIM = 7k (Note 6) 1.2 A Maximum Duty Cycle ● 85 90 % Switching Frequency 90 100 110 kHz Tj ≤ 125°C ● 85 120 kHz Tj > 125°C ● 85 125 kHz VFB = 0V through 2kΩ (Note 5) 20 kHz Switching Frequency Line Regulation 8V ≤ VIN ≤ VMAX (Note 8) ● 0.03 0.1 %/V Error Amplifier Voltage Gain (Note 7) 1V ≤ VC ≤ 4V 2000 V/V Error Amplifier Transconductance 3700 5000 8000 µmho Error Amplifier Source and Sink Current Source (VFB = 2V) 100 140 225 µA Sink (VFB = 2.5V) 0.7 1 1.6 mA Feedback Pin Bias Current VFB = VREF ● 0.5 2 µA Reference Voltage VC = 2V ● 2.155 2.21 2.265 V Reference Voltage Tolerance VREF (Nominal) = 2.21V ±0.5 ±1.5 % All Conditions of Input Voltage, Output ● ±1 ±2.5 % Voltage, Temperature and Load Current Reference Voltage Line Regulation 8V ≤ VIN ≤ VMAX (Note 8) ● 0.005 0.02 %/V VC Voltage at 0% Duty Cycle 1.5 V Over Temperature ● – 4 mV/°C Multiplier Reference Voltage 24 V Shutdown Pin Current VSH = 5V ● 5 10 20 µA VSH ≤ VTHRESHOLD (≅2.5V) ● 50 µA Shutdown Thresholds Switch Duty Cycle = 0 ● 2.2 2.45 2.7 V Fully Shut Down ● 0.1 0.3 0.6 V Thermal Resistance Junction to Case LT1074 2.5 °C/W LT1076 4.0 °C/W sn1074 1074fds 3
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. Tj = 25
°
C, VIN = 25V, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
Switch “On” Voltage (Note 2) LT1074 ISW = 1A, Tj ≥ 0°C 1.85 V ISW = 1A, Tj < 0°C 2.1 V ISW = 5A, Tj ≥ 0°C 2.3 V ISW = 5A, Tj < 0°C 2.5 V LT1076 ISW = 0.5A ● 1.2 V ISW = 2A ● 1.7 V Switch “Off” Leakage LT1074 VIN ≤ 25V, VSW = 0 5 300 µA VIN = VMAX, VSW = 0 (Note 8) 10 500 µA LT1076 VIN = 25V, VSW = 0 150 µA VIN = VMAX, VSW = 0 (Note 8) 250 µA Supply Current (Note 3) VFB = 2.5V, VIN ≤ 40V ● 8.5 11 mA 40V < VIN < 60V ● 9 12 mA VSHUT = 0.1V (Device Shutdown) (Note 9) ● 140 300 µA Minimum Supply Voltage Normal Mode ● 7.3 8 V Startup Mode (Note 4) ● 3.5 4.8 V Switch Current Limit (Note 5) LT1074 ILIM Open ● 5.5 6.5 8.5 A RLIM = 10k (Note 6) 4.5 A RLIM = 7k (Note 6) 3 A LT1076 ILIM Open ● 2 2.6 3.2 A RLIM = 10k (Note 6) 1.8 A RLIM = 7k (Note 6) 1.2 A Maximum Duty Cycle ● 85 90 % Switching Frequency 90 100 110 kHz Tj ≤ 125°C ● 85 120 kHz Tj > 125°C ● 85 125 kHz VFB = 0V through 2kΩ (Note 5) 20 kHz Switching Frequency Line Regulation 8V ≤ VIN ≤ VMAX (Note 8) ● 0.03 0.1 %/V Error Amplifier Voltage Gain (Note 7) 1V ≤ VC ≤ 4V 2000 V/V Error Amplifier Transconductance 3700 5000 8000 µmho Error Amplifier Source and Sink Current Source (VFB = 2V) 100 140 225 µA Sink (VFB = 2.5V) 0.7 1 1.6 mA Feedback Pin Bias Current VFB = VREF ● 0.5 2 µA Reference Voltage VC = 2V ● 2.155 2.21 2.265 V Reference Voltage Tolerance VREF (Nominal) = 2.21V ±0.5 ±1.5 % All Conditions of Input Voltage, Output ● ±1 ±2.5 % Voltage, Temperature and Load Current Reference Voltage Line Regulation 8V ≤ VIN ≤ VMAX (Note 8) ● 0.005 0.02 %/V VC Voltage at 0% Duty Cycle 1.5 V Over Temperature ● – 4 mV/°C Multiplier Reference Voltage 24 V Shutdown Pin Current VSH = 5V ● 5 10 20 µA VSH ≤ VTHRESHOLD (≅2.5V) ● 50 µA Shutdown Thresholds Switch Duty Cycle = 0 ● 2.2 2.45 2.7 V Fully Shut Down ● 0.1 0.3 0.6 V Thermal Resistance Junction to Case LT1074 2.5 °C/W LT1076 4.0 °C/W sn1074 1074fds 3
