Datasheet LTC3869, LTC3869-2 (Analog Devices) - 6
| Hersteller | Analog Devices |
| Beschreibung | Dual, 2-Phase Synchronous Step-Down DC/DC Controllers |
| Seiten / Seite | 44 / 6 — Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. … |
| Dateiformat / Größe | PDF / 687 Kb |
| Dokumentensprache | Englisch |
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. Tracking Up and Down. Coincident Tracking
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LTC3869/LTC3869-2
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. Tracking Up and Down Coincident Tracking with External Ramp
TK/SS1 TK/SS2 RUN 2V/DIV 2V/DIV VOUT1 VOUT1 VOUT2 V V V OUT2 OUT1 OUT1 V V OUT2 OUT2 500mA/DIV 1V/DIV 5ms/DIV 3869 G09 10ms/DIV 3869 G10 V V IN = 12V OUT1 = 1.8V, 1.5Ω LOAD V V OUT1 = 1.8V, 1.5Ω LOAD OUT2 = 1.2V, 1Ω LOAD VOUT2 = 1.2V, 1Ω LOAD
Quiescent Current without EXTVCC Current Sense Threshold vs Temperature INTVCC Line Regulation vs ITH Voltage
4.0 5.5 80 ILIM = INTVCC 3.5 5.0 60 3.0 4.5 40 ILIM = FLOAT 2.5 TAGE (V) 4.0 (mV) 2.0 20 VOL 3.5 ILIM = GND 1.5 V CC V SENSE INT 0 3.0 QUIESCENT CURRENT (mA) 1.0 2.5 –20 0.5 0 2.0 –40 –50 –25 0 25 50 75 100 125 0 10 20 30 40 0 0.5 1 1.5 2 TEMPERATURE (°C) INPUT VOLTAGE (V) VITH (V) 3869 G11 3869 G12 3869 G13
Maximum Current Sense Maximum Current Sense Voltage Threshold vs Common Mode Maximum Current Sense vs Feedback Voltage (Current Voltage Threshold vs Duty Cycle Foldback)
80 80 90 I 70 ILIM = INTVCC 70 I 80 LIM = INTVCC LIM = INTVCC 60 60 70 60 I 50 50 LIM = FLOAT ILIM = FLOAT ILIM = FLOAT 50 40 40 40 30 I 30 LIM = GND ILIM = GND ILIM = GND 30 20 20 20 CURRENT SENSE THRESHOLD (mV) 10 CURRENT SENSE THRESHOLD (mV) 10 10 0 0 MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 0 2 4 6 8 10 12 0 20 40 60 80 100 0 0.1 0.2 0.3 0.4 0.5 0.6 VSENSE COMMON MODE VOLTAGE (V) DUTY CYCLE (%) FEEDBACK VOLTAGE (V) 3869 G14 3869 G15 3869 G16 38692fb 6 For more information www.linear.com/LTC3869 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 Revision History Typical Application Related Parts
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. Tracking Up and Down Coincident Tracking with External Ramp
TK/SS1 TK/SS2 RUN 2V/DIV 2V/DIV VOUT1 VOUT1 VOUT2 V V V OUT2 OUT1 OUT1 V V OUT2 OUT2 500mA/DIV 1V/DIV 5ms/DIV 3869 G09 10ms/DIV 3869 G10 V V IN = 12V OUT1 = 1.8V, 1.5Ω LOAD V V OUT1 = 1.8V, 1.5Ω LOAD OUT2 = 1.2V, 1Ω LOAD VOUT2 = 1.2V, 1Ω LOAD
Quiescent Current without EXTVCC Current Sense Threshold vs Temperature INTVCC Line Regulation vs ITH Voltage
4.0 5.5 80 ILIM = INTVCC 3.5 5.0 60 3.0 4.5 40 ILIM = FLOAT 2.5 TAGE (V) 4.0 (mV) 2.0 20 VOL 3.5 ILIM = GND 1.5 V CC V SENSE INT 0 3.0 QUIESCENT CURRENT (mA) 1.0 2.5 –20 0.5 0 2.0 –40 –50 –25 0 25 50 75 100 125 0 10 20 30 40 0 0.5 1 1.5 2 TEMPERATURE (°C) INPUT VOLTAGE (V) VITH (V) 3869 G11 3869 G12 3869 G13
Maximum Current Sense Maximum Current Sense Voltage Threshold vs Common Mode Maximum Current Sense vs Feedback Voltage (Current Voltage Threshold vs Duty Cycle Foldback)
80 80 90 I 70 ILIM = INTVCC 70 I 80 LIM = INTVCC LIM = INTVCC 60 60 70 60 I 50 50 LIM = FLOAT ILIM = FLOAT ILIM = FLOAT 50 40 40 40 30 I 30 LIM = GND ILIM = GND ILIM = GND 30 20 20 20 CURRENT SENSE THRESHOLD (mV) 10 CURRENT SENSE THRESHOLD (mV) 10 10 0 0 MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 0 2 4 6 8 10 12 0 20 40 60 80 100 0 0.1 0.2 0.3 0.4 0.5 0.6 VSENSE COMMON MODE VOLTAGE (V) DUTY CYCLE (%) FEEDBACK VOLTAGE (V) 3869 G14 3869 G15 3869 G16 38692fb 6 For more information www.linear.com/LTC3869 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 Revision History Typical Application Related Parts