Datasheet LT1176, LT1176-5 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | Step-Down Switching Regulator |
| Pages / Page | 8 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| File Format / Size | PDF / 145 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the full operating
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LT1176/LT1176-5
ELECTRICAL CHARACTERISTICS The
l
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) ISW = 0.2A l 1.1 V ISW = 1A l 1.4 V Switch OFF Leakage VIN = 25V, VSW = 0 150 µA VIN = VMAX, VSW = 0 (Note 8) 250 µA Supply Current (Note 3) VFB = 2.5V, VIN ≤ 35V l 7.5 10 mA VSHDN = 0.1V (Device Shutdown) (Note 9) l 140.0 300 µA Minimum Supply Voltage Normal Mode l 7.3 8.0 V Startup Mode (Note 4) l 3.5 4.8 V Switch Current Limit (Note 5) ILIM Open l 1.2 1.7 2.2 A RLIM = 10k (Note 6) 1.2 A RLIM = 7k (Note 6) 0.8 A Maximum Duty Cycle l 85 90 % Switching Frequency 90 100 110 kHz l 85 120 kHz VFB = 0V Through 2k (Note 5) (LT1176) 20 kHz VSENSE = 0V (Note 5) (LT1176-5) 20 kHz Switching Frequency Line Regulation 8V ≤ VIN ≤ VMAX (Note 8) l 0.03 0.1 %/V Error Amplifier Voltage Gain (Note 10) 1V ≤ VC ≤ 4V 2000 V/V Error Amplifier Transconductance (Note 10) 3700 5000 8000 µmho Error Amplifier Source and Sink Current Source (VFB = 2V or VSENSE = 4V) 100.0 140 225.0 µA Sink (VFB = 2.5V or VSENSE = 5.5V) 0.7 1.0 1.6 mA Feedback Pin Bias Current (LT1176) VFB = VREF l 0.5 2 µA Reference Voltage (LT1176) VC = 2V l 2.155 2.21 2.265 V Reference Voltage Tolerance (LT1176) VREF (Nominal) = 2.21V ±0.5 ±2 % All Conditions of Input Voltage, Output Voltage, l ±1.0 ±3 % Temperature and Load Current Sense Voltage (LT1176-5) VC = 2V l 4.85 5 5.15 V Sense Voltage Tolerance (LT1176-5) VOUT (Nominal) = 5V ±0.5 ±2 % All Conditions of Input Voltage, l ±0.1 ±3 % Temperature and Load Current Sense Pin Divider Resistance (LT1176-5) 3 5 8 kΩ Output Voltage Line Regulation 8V ≤ VIN ≤ VMAX (Note 8) l 0.005 0.02 %/V VC Voltage at 0% Duty Cycle 1.5 V Overtemperature l –4.0 mV/°C Multiplier Reference Voltage 24 V Shutdown Pin Current VSHDN = 5V l 5 10 20 µA VSHDN ≤ VTHRESHOLD (@ 2.5V) l 50 µA Shutdown Thresholds Switch Duty Cycle = 0 l 2.2 2.45 2.7 V Fully Shutdown l 0.1 0.30 0.5 V Status Window As a Percent of Output Voltage ±4 ±5 ±6 % Status High Level ISTATUS = 10µA Sourcing l 3.5 4.5 5.0 V 11765fb 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Block Diagram Package Description Revision History Package Description
ELECTRICAL CHARACTERISTICS The
l
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) ISW = 0.2A l 1.1 V ISW = 1A l 1.4 V Switch OFF Leakage VIN = 25V, VSW = 0 150 µA VIN = VMAX, VSW = 0 (Note 8) 250 µA Supply Current (Note 3) VFB = 2.5V, VIN ≤ 35V l 7.5 10 mA VSHDN = 0.1V (Device Shutdown) (Note 9) l 140.0 300 µA Minimum Supply Voltage Normal Mode l 7.3 8.0 V Startup Mode (Note 4) l 3.5 4.8 V Switch Current Limit (Note 5) ILIM Open l 1.2 1.7 2.2 A RLIM = 10k (Note 6) 1.2 A RLIM = 7k (Note 6) 0.8 A Maximum Duty Cycle l 85 90 % Switching Frequency 90 100 110 kHz l 85 120 kHz VFB = 0V Through 2k (Note 5) (LT1176) 20 kHz VSENSE = 0V (Note 5) (LT1176-5) 20 kHz Switching Frequency Line Regulation 8V ≤ VIN ≤ VMAX (Note 8) l 0.03 0.1 %/V Error Amplifier Voltage Gain (Note 10) 1V ≤ VC ≤ 4V 2000 V/V Error Amplifier Transconductance (Note 10) 3700 5000 8000 µmho Error Amplifier Source and Sink Current Source (VFB = 2V or VSENSE = 4V) 100.0 140 225.0 µA Sink (VFB = 2.5V or VSENSE = 5.5V) 0.7 1.0 1.6 mA Feedback Pin Bias Current (LT1176) VFB = VREF l 0.5 2 µA Reference Voltage (LT1176) VC = 2V l 2.155 2.21 2.265 V Reference Voltage Tolerance (LT1176) VREF (Nominal) = 2.21V ±0.5 ±2 % All Conditions of Input Voltage, Output Voltage, l ±1.0 ±3 % Temperature and Load Current Sense Voltage (LT1176-5) VC = 2V l 4.85 5 5.15 V Sense Voltage Tolerance (LT1176-5) VOUT (Nominal) = 5V ±0.5 ±2 % All Conditions of Input Voltage, l ±0.1 ±3 % Temperature and Load Current Sense Pin Divider Resistance (LT1176-5) 3 5 8 kΩ Output Voltage Line Regulation 8V ≤ VIN ≤ VMAX (Note 8) l 0.005 0.02 %/V VC Voltage at 0% Duty Cycle 1.5 V Overtemperature l –4.0 mV/°C Multiplier Reference Voltage 24 V Shutdown Pin Current VSHDN = 5V l 5 10 20 µA VSHDN ≤ VTHRESHOLD (@ 2.5V) l 50 µA Shutdown Thresholds Switch Duty Cycle = 0 l 2.2 2.45 2.7 V Fully Shutdown l 0.1 0.30 0.5 V Status Window As a Percent of Output Voltage ±4 ±5 ±6 % Status High Level ISTATUS = 10µA Sourcing l 3.5 4.5 5.0 V 11765fb 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Block Diagram Package Description Revision History Package Description
