Datasheet LTC3774 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | Dual, Multiphase Current Mode Synchronous Controller for Sub-Milliohm DCR Sensing |
| Pages / Page | 38 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS. Maximum Current Sense. Maximum … |
| File Format / Size | PDF / 426 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Maximum Current Sense. Maximum Current Sense Threshold. Threshold vs Feedback Voltage
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LTC3774
TYPICAL PERFORMANCE CHARACTERISTICS Maximum Current Sense Maximum Current Sense Threshold Threshold vs Feedback Voltage Current Sense Threshold vs Common Mode Voltage (Current Foldback) vs ITH Voltage
35 35 35 I I LIM = 0 LIM = INTVCC 30 I 30 30 LIM = 1/4 INTVCC ILIM = 1/2 INTVCC I 25 I LIM = 3/4 INTVCC LIM = 3/4 INTVCC I 25 25 LIM = INTVCC 20 ILIM = 1/2 INTVCC 20 20 15 ILIM = 1/4 INTVCC 15 15 10 ILIM = 0 5 10 10 0 INTV 1/4 INTV 5 CC CC 3/4 INTV 5 CC 0 CURRENT SENSE THRESHOLD (mV) –5 1/2 INTVCC MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 –10 0 0.5 1 1.5 2 2.5 3 3.5 0 0.1 0.2 0.3 0.4 0.5 0.6 0 0.25 0.5 0.75 1 1.25 1.5 1.75 2 COMMON MODE VOLTAGE (V) FEEDBACK VOLTAGE (V) V(ITH) (V) 3774 G01 3774 G02 3774 G03
Input Quiescent Current Shutdown Current vs Input Voltage vs Input Voltage INTVCC Line Regulation
12 60 6 10 50 5 8 40 4 6 30 3 VOLTAGE (V) CC 4 20 2 INTV QUIESCENT CURRENT (mA) SHUTDOWN CURRENT (µA) 2 10 1 0 0 0 0 5 10 15 20 25 30 35 40 0 5 10 15 20 25 30 35 40 0 5 10 15 20 25 30 35 40 INPUT VOLTAGE (V) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 3774 G04 3774 G05 3774 G06
Oscillator Frequency Load Step (Continuous vs Input Voltage Conduction Mode)
1200 VIN = 12V 75kΩ 1000 VOUT = 1.5V 50mV/DIV AC-COUPLED 800 47.5kΩ 600 ILOAD 5A-DIV 15A TO 30A FREQUENCY (kHz) 400 50µs/DIV 3774 G08 200 23.2kΩ 0 0 5 10 15 20 25 30 35 40 INPUT VOLTAGE (V) 3774 G07 3774fc For more information www.linear.com/LTC3774 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Maximum Current Sense Maximum Current Sense Threshold Threshold vs Feedback Voltage Current Sense Threshold vs Common Mode Voltage (Current Foldback) vs ITH Voltage
35 35 35 I I LIM = 0 LIM = INTVCC 30 I 30 30 LIM = 1/4 INTVCC ILIM = 1/2 INTVCC I 25 I LIM = 3/4 INTVCC LIM = 3/4 INTVCC I 25 25 LIM = INTVCC 20 ILIM = 1/2 INTVCC 20 20 15 ILIM = 1/4 INTVCC 15 15 10 ILIM = 0 5 10 10 0 INTV 1/4 INTV 5 CC CC 3/4 INTV 5 CC 0 CURRENT SENSE THRESHOLD (mV) –5 1/2 INTVCC MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 –10 0 0.5 1 1.5 2 2.5 3 3.5 0 0.1 0.2 0.3 0.4 0.5 0.6 0 0.25 0.5 0.75 1 1.25 1.5 1.75 2 COMMON MODE VOLTAGE (V) FEEDBACK VOLTAGE (V) V(ITH) (V) 3774 G01 3774 G02 3774 G03
Input Quiescent Current Shutdown Current vs Input Voltage vs Input Voltage INTVCC Line Regulation
12 60 6 10 50 5 8 40 4 6 30 3 VOLTAGE (V) CC 4 20 2 INTV QUIESCENT CURRENT (mA) SHUTDOWN CURRENT (µA) 2 10 1 0 0 0 0 5 10 15 20 25 30 35 40 0 5 10 15 20 25 30 35 40 0 5 10 15 20 25 30 35 40 INPUT VOLTAGE (V) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 3774 G04 3774 G05 3774 G06
Oscillator Frequency Load Step (Continuous vs Input Voltage Conduction Mode)
1200 VIN = 12V 75kΩ 1000 VOUT = 1.5V 50mV/DIV AC-COUPLED 800 47.5kΩ 600 ILOAD 5A-DIV 15A TO 30A FREQUENCY (kHz) 400 50µs/DIV 3774 G08 200 23.2kΩ 0 0 5 10 15 20 25 30 35 40 INPUT VOLTAGE (V) 3774 G07 3774fc For more information www.linear.com/LTC3774 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
