Datasheet LT3667 (Analog Devices) - 7
| Hersteller | Analog Devices |
| Beschreibung | 40V 400mA Step-Down Switching Regulator with Dual Fault Protected LDOs |
| Seiten / Seite | 34 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. … |
| Dateiformat / Größe | PDF / 446 Kb |
| Dokumentensprache | Englisch |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Minimum Switch On-Time/. Switch Current Limit
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LT3667
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Minimum Switch On-Time/ Switch Current Limit Switching Frequency Switch-Off Time
900 2.4 200 LOAD CURRENT = 200mA 2.2 RT = 37.4k 180 2.0 800 160 0% DUTY CYCLE 1.8 MINIMUM OFF-TIME 1.6 140 700 1.4 120 MINIMUM ON-TIME 1.2 R 100 T = 95.3k 600 1.0 100% DUTY CYCLE 80 FREQUENCY (MHz) 0.8 60 0.6 SWITCH CURRENT LIMIT (mA) 500 40 0.4 R CATCH DIODE VALLEY CURRENT LIMIT T = 487k 0.2 SWITCH ON-TIME/SWITCH OFF-TIME (ns) 20 400 0 0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3667 G10 3667 G11 3667 G12
Minimum Input Voltage, Switch VCESAT BOOST Pin Current VOUT = 3.3V
600 20 5.0 FRONT PAGE APPLICATION 18 VEN = VIN1, VOUT1 = 3.3V 500 16 4.5 (V) 400 14 (mV) IN1 TO START 4.0 12 CESAT 300 TO RUN 10 3.5 200 8 SWITCH V TJ = –50°C BOOST PIN CURRENT (mA) 6 INPUT VOLTAGE V 3.0 100 TJ = 25°C TA = 150°C TJ = 125°C 4 TA = 25°C TJ = 150°C TA = –50°C 0 2 3.5 0 100 200 300 400 500 600 700 0 100 200 300 400 500 600 0 50 100 150 200 250 300 350 400 SWITCH CURRENT (mA) SWITCH CURRENT (mA) LOAD CURRENT IOUT1 (mA) 3667 G13 3667 G14 3667 G15
Minimum Input Voltage, Transient Load Response, Transient Load Response VOUT = 5V Load Step 10mA to 140mA Load Step 150mA to 300mA
6.5 FRONT PAGE APPLICATION FRONT PAGE APPLICATION 6.0 TO START VOUT1 VOUT1 (V) 100mV/DIV 100mV/DIV IN1 5.5 TO RUN 5.0 IL IL INPUT VOLTAGE V 100mA/DIV 150mA/DIV 4.5 FRONT PAGE APPLICATION VEN = VIN1, VOUT1 = 5V 4.0 0 50 100 150 200 250 300 350 400 3667 G17 100µs/DIV 3667 G18 100µs/DIV LOAD CURRENT IOUT1 (mA) 3667 G16 3667fb For more information www.linear.com/LT3667 7 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Order Information Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Revision History Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Minimum Switch On-Time/ Switch Current Limit Switching Frequency Switch-Off Time
900 2.4 200 LOAD CURRENT = 200mA 2.2 RT = 37.4k 180 2.0 800 160 0% DUTY CYCLE 1.8 MINIMUM OFF-TIME 1.6 140 700 1.4 120 MINIMUM ON-TIME 1.2 R 100 T = 95.3k 600 1.0 100% DUTY CYCLE 80 FREQUENCY (MHz) 0.8 60 0.6 SWITCH CURRENT LIMIT (mA) 500 40 0.4 R CATCH DIODE VALLEY CURRENT LIMIT T = 487k 0.2 SWITCH ON-TIME/SWITCH OFF-TIME (ns) 20 400 0 0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3667 G10 3667 G11 3667 G12
Minimum Input Voltage, Switch VCESAT BOOST Pin Current VOUT = 3.3V
600 20 5.0 FRONT PAGE APPLICATION 18 VEN = VIN1, VOUT1 = 3.3V 500 16 4.5 (V) 400 14 (mV) IN1 TO START 4.0 12 CESAT 300 TO RUN 10 3.5 200 8 SWITCH V TJ = –50°C BOOST PIN CURRENT (mA) 6 INPUT VOLTAGE V 3.0 100 TJ = 25°C TA = 150°C TJ = 125°C 4 TA = 25°C TJ = 150°C TA = –50°C 0 2 3.5 0 100 200 300 400 500 600 700 0 100 200 300 400 500 600 0 50 100 150 200 250 300 350 400 SWITCH CURRENT (mA) SWITCH CURRENT (mA) LOAD CURRENT IOUT1 (mA) 3667 G13 3667 G14 3667 G15
Minimum Input Voltage, Transient Load Response, Transient Load Response VOUT = 5V Load Step 10mA to 140mA Load Step 150mA to 300mA
6.5 FRONT PAGE APPLICATION FRONT PAGE APPLICATION 6.0 TO START VOUT1 VOUT1 (V) 100mV/DIV 100mV/DIV IN1 5.5 TO RUN 5.0 IL IL INPUT VOLTAGE V 100mA/DIV 150mA/DIV 4.5 FRONT PAGE APPLICATION VEN = VIN1, VOUT1 = 5V 4.0 0 50 100 150 200 250 300 350 400 3667 G17 100µs/DIV 3667 G18 100µs/DIV LOAD CURRENT IOUT1 (mA) 3667 G16 3667fb For more information www.linear.com/LT3667 7 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Order Information Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Revision History Typical Application Related Parts