Datasheet LT8645S, LT8646S (Analog Devices) - 8
| 制造商 | Analog Devices |
| 描述 | 65V, 8A Synchronous Step-Down Silent Switcher 2 with 2.5μA Quiescent Current |
| 页数 / 页 | 30 / 8 — TYPICAL PERFORMANCE CHARACTERISTICS. LT8645S Soft-Start Tracking. LT8646S … |
| 修订版 | B |
| 文件格式/大小 | PDF / 2.4 Mb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS. LT8645S Soft-Start Tracking. LT8646S Soft-Start Tracking. Soft-Start Current
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LT8645S/LT8646S
TYPICAL PERFORMANCE CHARACTERISTICS LT8645S Soft-Start Tracking LT8646S Soft-Start Tracking Soft-Start Current LT8646S Soft-Start Tracking
1.2 1.2 2.2 VSS = 0.5V 2.1 1.0 1.0 2.0 0.8 0.8 1.9 0.6 TAGE (V) 0.6 1.8 FB VOLTAGE (V) 1.7 0.4 FB VOL 0.4 TR/SS PIN CURRENT (µA) 1.6 0.2 0.2 1.5 0 0 1.4 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 –50 –25 0 25 50 75 100 125 TR/SS VOLTAGE (V) TR/SS VOLTAGE (V) TEMPERATURE (°C) 8645S G29 8645S G30 8645S G28
LT8646S Error Amp Output Current LT8646S Error Amp Output Current PG High Thresholds PG Low Thresholds
500 10.0 –6.0 375 9.5 (%) –6.5 (%) REF REF 250 9.0 –7.0 125 8.5 –7.5 FB RISING 0 FB RISING 8.0 –8.0 –125 –8.5 FB FALLING PIN CURRENT (µA) 7.5 FB FALLING V CC –250 7.0 –9.0 –375 6.5 –9.5 V PG THRESHOLD OFFSET FROM V PG THRESHOLD OFFSET FROM V C = 1.25V –500 6.0 –10.0 –200 –100 0 100 200 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 FB PIN ERROR VOLTAGE (mV) TEMPERATURE (°C) TEMPERATURE (°C) 8645S G31 8645S G32 8645S G33
RT Programmed Switching Frequency Minimum Input Voltage Bias Pin Current
250 3.6 15 225 3.4 200 14 175 3.2 150 13 TAGE (V) 125 3.0 100 12 2.8 INPUT VOL RT PIN RESISTOR (kΩ) 75 BIAS PIN CURRENT (mA) 50 2.6 11 VBIAS = 5V 25 VOUT = 5V fSW = 1MHz 0 2.4 10 0.2 0.6 1 1.4 1.8 2.2 –50 –25 0 25 50 75 100 125 5 15 25 35 45 55 65 SWITCHING FREQUENCY (MHz) TEMPERATURE (°C) INPUT VOLTAGE (V) 8645S G35 8645S G36 8645S G34 Rev. B 8 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Applications Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS LT8645S Soft-Start Tracking LT8646S Soft-Start Tracking Soft-Start Current LT8646S Soft-Start Tracking
1.2 1.2 2.2 VSS = 0.5V 2.1 1.0 1.0 2.0 0.8 0.8 1.9 0.6 TAGE (V) 0.6 1.8 FB VOLTAGE (V) 1.7 0.4 FB VOL 0.4 TR/SS PIN CURRENT (µA) 1.6 0.2 0.2 1.5 0 0 1.4 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 –50 –25 0 25 50 75 100 125 TR/SS VOLTAGE (V) TR/SS VOLTAGE (V) TEMPERATURE (°C) 8645S G29 8645S G30 8645S G28
LT8646S Error Amp Output Current LT8646S Error Amp Output Current PG High Thresholds PG Low Thresholds
500 10.0 –6.0 375 9.5 (%) –6.5 (%) REF REF 250 9.0 –7.0 125 8.5 –7.5 FB RISING 0 FB RISING 8.0 –8.0 –125 –8.5 FB FALLING PIN CURRENT (µA) 7.5 FB FALLING V CC –250 7.0 –9.0 –375 6.5 –9.5 V PG THRESHOLD OFFSET FROM V PG THRESHOLD OFFSET FROM V C = 1.25V –500 6.0 –10.0 –200 –100 0 100 200 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 FB PIN ERROR VOLTAGE (mV) TEMPERATURE (°C) TEMPERATURE (°C) 8645S G31 8645S G32 8645S G33
RT Programmed Switching Frequency Minimum Input Voltage Bias Pin Current
250 3.6 15 225 3.4 200 14 175 3.2 150 13 TAGE (V) 125 3.0 100 12 2.8 INPUT VOL RT PIN RESISTOR (kΩ) 75 BIAS PIN CURRENT (mA) 50 2.6 11 VBIAS = 5V 25 VOUT = 5V fSW = 1MHz 0 2.4 10 0.2 0.6 1 1.4 1.8 2.2 –50 –25 0 25 50 75 100 125 5 15 25 35 45 55 65 SWITCHING FREQUENCY (MHz) TEMPERATURE (°C) INPUT VOLTAGE (V) 8645S G35 8645S G36 8645S G34 Rev. B 8 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Applications Related Parts