Datasheet LT8652S (Analog Devices) - 7
| 制造商 | Analog Devices |
| 描述 | Dual Channel 8.5A, 18V, Synchronous Step-Down Silent Switcher with 16µA Quiescent Current |
| 页数 / 页 | 36 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. … |
| 修订版 | A |
| 文件格式/大小 | PDF / 4.2 Mb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Switching Frequency. Burst Frequency
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LT8652S
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Switching Frequency Burst Frequency Soft-Start Tracking
1.25 2.50 0.8 R V T = 41.2kΩ IN1 = 12V 1.20 2.25 VOUT = 1V SYNC = 0V 1.15 2.00 RT = 20kΩ 0.6 1.75 L = 0.2µH 1.10 1.50 1.05 1.25 TAGE (V) 0.4 1.00 1.00 0.95 FB VOL 0.75 0.90 0.2 SWITCHING FREQUENCY (MHz) 0.50 SWITCHING FREQUENCY (MHz) 0.85 0.25 EXTERNAL COMPENSATION INTERNAL COMPENSATION 0.80 0 0 –55 –25 5 35 65 95 125 155 0 1 2 3 4 5 0 0.2 0.4 0.6 0.8 1.0 1.2 TEMPERATURE (°C) LOAD CURRENT (A) SS VOLTAGE (V) 8652S G22 8652S G23 8652S G24
Soft-Start Current EN Pin Thresholds PG High Thresholds
2.4 0.84 9.0 VSS = 0.4V 2.3 0.83 8.5 (%) REF 8.0 2.2 0.82 7.5 2.1 0.81 7.0 2.0 0.80 6.5 1.9 0.79 6.0 EN THRESHOLD (V) SS PIN CURRENT (µA) 5.5 1.8 0.78 5.0 1.7 0.77 EN RISING 4.5 FB RISING EN FALLING PG THRESHOLD OFFSET FROM V FB FALLING 1.6 0.76 4.0 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 8652S G25 8652S G26 8652S G27
PG Low Thresholds Minimum Input Voltage Temperature Monitor Pin
–4.0 3.0 1.70 SS1 = SS2 = 0V, FCM –4.5 VIN1 = VIN2 (%) 1.40 REF –5.0 2.8 1.10 –5.5 –6.0 2.6 0.80 TAGE (V) TAGE (V) –6.5 0.50 –7.0 2.4 0.20 –7.5 INPUT VOL TEMP PIN VOL –0.10 –8.0 2.2 –8.5 –0.40 PG THRESHOLD OFFSET FROM V FB RISING FB FALLING –9.0 2.0 –0.70 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 8652S G28 8652S G29 8652S G30 BELOW 5°C: 100kΩ RESISTOR FROM TEMP TO –4V ABOVE 5°C: FLOAT TEMP Rev. A For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information 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 TA = 25°C, unless otherwise noted. Switching Frequency Burst Frequency Soft-Start Tracking
1.25 2.50 0.8 R V T = 41.2kΩ IN1 = 12V 1.20 2.25 VOUT = 1V SYNC = 0V 1.15 2.00 RT = 20kΩ 0.6 1.75 L = 0.2µH 1.10 1.50 1.05 1.25 TAGE (V) 0.4 1.00 1.00 0.95 FB VOL 0.75 0.90 0.2 SWITCHING FREQUENCY (MHz) 0.50 SWITCHING FREQUENCY (MHz) 0.85 0.25 EXTERNAL COMPENSATION INTERNAL COMPENSATION 0.80 0 0 –55 –25 5 35 65 95 125 155 0 1 2 3 4 5 0 0.2 0.4 0.6 0.8 1.0 1.2 TEMPERATURE (°C) LOAD CURRENT (A) SS VOLTAGE (V) 8652S G22 8652S G23 8652S G24
Soft-Start Current EN Pin Thresholds PG High Thresholds
2.4 0.84 9.0 VSS = 0.4V 2.3 0.83 8.5 (%) REF 8.0 2.2 0.82 7.5 2.1 0.81 7.0 2.0 0.80 6.5 1.9 0.79 6.0 EN THRESHOLD (V) SS PIN CURRENT (µA) 5.5 1.8 0.78 5.0 1.7 0.77 EN RISING 4.5 FB RISING EN FALLING PG THRESHOLD OFFSET FROM V FB FALLING 1.6 0.76 4.0 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 8652S G25 8652S G26 8652S G27
PG Low Thresholds Minimum Input Voltage Temperature Monitor Pin
–4.0 3.0 1.70 SS1 = SS2 = 0V, FCM –4.5 VIN1 = VIN2 (%) 1.40 REF –5.0 2.8 1.10 –5.5 –6.0 2.6 0.80 TAGE (V) TAGE (V) –6.5 0.50 –7.0 2.4 0.20 –7.5 INPUT VOL TEMP PIN VOL –0.10 –8.0 2.2 –8.5 –0.40 PG THRESHOLD OFFSET FROM V FB RISING FB FALLING –9.0 2.0 –0.70 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 8652S G28 8652S G29 8652S G30 BELOW 5°C: 100kΩ RESISTOR FROM TEMP TO –4V ABOVE 5°C: FLOAT TEMP Rev. A For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts