Datasheet LT8650S (Analog Devices) - 7
| Fabricante | Analog Devices |
| Descripción | Dual Channel 4A, 42V, Synchronous Step-Down Silent Switcher 2 with 6.2µA Quiescent Current |
| Páginas / Página | 32 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS. RT Programmed Switching. PG Low … |
| Revisión | A |
| Formato / tamaño de archivo | PDF / 1.4 Mb |
| Idioma del documento | Inglés |
TYPICAL PERFORMANCE CHARACTERISTICS. RT Programmed Switching. PG Low Threshold. Frequency. Minimum Input Voltage
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LT8650S
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LT8650S
TYPICAL PERFORMANCE CHARACTERISTICS RT Programmed Switching PG Low Threshold Frequency Minimum Input Voltage
–5.0 150 3.0 –5.5 VIN1 = VIN2 (%) 135 REF –6.0 120 2.8 –6.5 105 –7.0 90 2.6 TAGE (V) –7.5 75 –8.0 60 2.4 –8.5 45 INPUT VOL RT PIN RESISTOR (kΩ) –9.0 30 2.2 –9.5 PG THRESHOLD OFFSET FROM V 15 FALLING –10.0 0 2.0 –55 –25 5 35 65 95 125 155 0 0.5 1 1.5 2 2.5 3 –55 –25 5 35 65 95 125 155 TEMPERATURE (°C) SWITCHING FREQUENCY (MHZ) TEMPERATURE (°C) 8650S G26 8650S G27 8650S G28
Temperature Monitor Pin Bias Pin Current per Channel Bias Pin Current per Channel
1.55 18.0 24 EN2 = 0V, SS1=0V, FCM fSW = 2MHz V 22 IN = 12V 1.25 17.5 LOAD = 1A LOAD = 2A 20 17.0 18 0.95 16 16.5 TAGE (V) 0.65 14 16.0 12 0.35 10 15.5 8 0.05 TEMP PIN VOL BIAS PIN CURRENT (mA) 15.0 BIAS PIN CURRENT (mA) 6 BELOW 5°C: 10kΩ RESISTOR –0.25 4 FROM TEMP TO –2V 14.5 ABOVE 5°C: FLOAT TEMP 2 –0.55 14.0 0 –55 –25 5 35 65 95 125 155 5 10 15 20 25 30 35 40 45 0 0.5 1 1.5 2 2.5 3 TEMPERATURE (°C) INPUT VOLTAGE (V) SWITCHING FREQUENCY (MHZ) 8650S G29 8650S G30 8650S G31
Transient Response Internal Transient Response Internal Transient Response External Compensation Compensation Compensation
ILOAD ILOAD 2A/DIV I 2A/DIV LOAD 2A/DIV VOUT VOUT VOUT 100mV/DIV 100mV/DIV 100mV/DIV 20µs/DIV 8650S G32 20µs/DIV 8650S G33 20µs/DIV 8650S G34 2A TO 4A TRANSIENT 40mA TO 2A TRANSIENT 2A TO 4A TRANSIENT 3.3VOUT 3.3VOUT 3.3VOUT COUT = 47µF ×2 COUT = 47µF ×2 COUT = 47µF ×2 FCM, fSW = 2MHz FCM, fSW = 2MHz FCM, fSW = 2MHz CC = 220pF, RC = 14kΩ Rev A For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS RT Programmed Switching PG Low Threshold Frequency Minimum Input Voltage
–5.0 150 3.0 –5.5 VIN1 = VIN2 (%) 135 REF –6.0 120 2.8 –6.5 105 –7.0 90 2.6 TAGE (V) –7.5 75 –8.0 60 2.4 –8.5 45 INPUT VOL RT PIN RESISTOR (kΩ) –9.0 30 2.2 –9.5 PG THRESHOLD OFFSET FROM V 15 FALLING –10.0 0 2.0 –55 –25 5 35 65 95 125 155 0 0.5 1 1.5 2 2.5 3 –55 –25 5 35 65 95 125 155 TEMPERATURE (°C) SWITCHING FREQUENCY (MHZ) TEMPERATURE (°C) 8650S G26 8650S G27 8650S G28
Temperature Monitor Pin Bias Pin Current per Channel Bias Pin Current per Channel
1.55 18.0 24 EN2 = 0V, SS1=0V, FCM fSW = 2MHz V 22 IN = 12V 1.25 17.5 LOAD = 1A LOAD = 2A 20 17.0 18 0.95 16 16.5 TAGE (V) 0.65 14 16.0 12 0.35 10 15.5 8 0.05 TEMP PIN VOL BIAS PIN CURRENT (mA) 15.0 BIAS PIN CURRENT (mA) 6 BELOW 5°C: 10kΩ RESISTOR –0.25 4 FROM TEMP TO –2V 14.5 ABOVE 5°C: FLOAT TEMP 2 –0.55 14.0 0 –55 –25 5 35 65 95 125 155 5 10 15 20 25 30 35 40 45 0 0.5 1 1.5 2 2.5 3 TEMPERATURE (°C) INPUT VOLTAGE (V) SWITCHING FREQUENCY (MHZ) 8650S G29 8650S G30 8650S G31
Transient Response Internal Transient Response Internal Transient Response External Compensation Compensation Compensation
ILOAD ILOAD 2A/DIV I 2A/DIV LOAD 2A/DIV VOUT VOUT VOUT 100mV/DIV 100mV/DIV 100mV/DIV 20µs/DIV 8650S G32 20µs/DIV 8650S G33 20µs/DIV 8650S G34 2A TO 4A TRANSIENT 40mA TO 2A TRANSIENT 2A TO 4A TRANSIENT 3.3VOUT 3.3VOUT 3.3VOUT COUT = 47µF ×2 COUT = 47µF ×2 COUT = 47µF ×2 FCM, fSW = 2MHz FCM, fSW = 2MHz FCM, fSW = 2MHz CC = 220pF, RC = 14kΩ Rev A For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts