Datasheet LT8636, LT8637 (Analog Devices) - 8
| Manufacturer | Analog Devices |
| Description | 42V, 5A/7A Peak Synchronous Step-Down Silent Switcher with 2.5µA Quiescent Current |
| Pages / Page | 32 / 8 — TYPICAL PERFORMANCE CHARACTERISTICS. LT8637 Soft-Start Tracking. … |
| Revision | C |
| File Format / Size | PDF / 2.7 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. LT8637 Soft-Start Tracking. Soft-Start Current. Soft–Start Current
Model Line for this Datasheet
Text Version of Document
LT8636/LT8637
TYPICAL PERFORMANCE CHARACTERISTICS LT8637 Soft-Start Tracking Soft-Start Current Soft–Start Current LT8637 Error Amp Output Current
1.2 2.2 500 VSS = 0.5V 2.1 375 1.0 2.0 250 0.8 1.9 125 TAGE (V) 0.6 1.8 0 1.7 FB VOL –125 0.4 PIN CURRENT (µA) SS PIN CURRENT (µA) V C 1.6 –250 0.2 1.5 –375 VC = 1.25V 0 1.4 –500 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 –50 –25 0 25 50 75 100 125 150 –200 –100 0 100 200 TR/SS VOLTAGE (V) TEMPERATURE (°C) FB PIN ERROR VOLTAGE (mV) 8636 G28 8636 G29 8636 G30
RT Programmed Switching PG High Thresholds PG Low Thresholds Frequency
10.0 –6.0 250 9.5 225 (%) –6.5 (%) REF REF 200 9.0 –7.0 175 8.5 –7.5 150 FB RISING 8.0 FB RISING –8.0 125 7.5 –8.5 100 FB FALLING FB FALLING 75 7.0 –9.0 RT PIN RESISTOR (kΩ) 50 6.5 –9.5 PG THRESHOLD OFFSET FROM V PG THRESHOLD OFFSET FROM V 25 6.0 –10.0 0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 0.2 0.6 1 1.4 1.8 2.2 2.6 3 TEMPERATURE (°C) TEMPERATURE (°C) SWITCHING FREQUENCY (MHz) 8636 G31 8636 G32 8636 G33
Minimum Input Voltage Minimum Input V Bias Pin Current Bias Pin Current
3.6 8.5 25 VBIAS = 5V V 3.4 8.0 OUT = 5V V 20 IN = 12V ILOAD = 1A 3.2 7.5 15 TAGE (V) 3.0 7.0 10 2.8 INPUT VOL 6.5 BIAS PIN CURRENT (mA) VBIAS = 5V BIAS PIN CURRENT (mA) V 5 2.6 OUT = 5V 6.0 ILOAD = 1A fSW = 1MHz 2.4 5.5 0 –50 –25 0 25 50 75 100 125 5 10 15 20 25 30 35 40 45 0.2 0.6 1 1.4 1.8 2.2 2.6 3.0 TEMPERATURE (°C) INPUT VOLTAGE (V) SWITCHING FREQUENCY (MHz) 8636 G34 8636 G35 8636 G36 Rev. C 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 LT8637 Soft-Start Tracking Soft-Start Current Soft–Start Current LT8637 Error Amp Output Current
1.2 2.2 500 VSS = 0.5V 2.1 375 1.0 2.0 250 0.8 1.9 125 TAGE (V) 0.6 1.8 0 1.7 FB VOL –125 0.4 PIN CURRENT (µA) SS PIN CURRENT (µA) V C 1.6 –250 0.2 1.5 –375 VC = 1.25V 0 1.4 –500 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 –50 –25 0 25 50 75 100 125 150 –200 –100 0 100 200 TR/SS VOLTAGE (V) TEMPERATURE (°C) FB PIN ERROR VOLTAGE (mV) 8636 G28 8636 G29 8636 G30
RT Programmed Switching PG High Thresholds PG Low Thresholds Frequency
10.0 –6.0 250 9.5 225 (%) –6.5 (%) REF REF 200 9.0 –7.0 175 8.5 –7.5 150 FB RISING 8.0 FB RISING –8.0 125 7.5 –8.5 100 FB FALLING FB FALLING 75 7.0 –9.0 RT PIN RESISTOR (kΩ) 50 6.5 –9.5 PG THRESHOLD OFFSET FROM V PG THRESHOLD OFFSET FROM V 25 6.0 –10.0 0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 0.2 0.6 1 1.4 1.8 2.2 2.6 3 TEMPERATURE (°C) TEMPERATURE (°C) SWITCHING FREQUENCY (MHz) 8636 G31 8636 G32 8636 G33
Minimum Input Voltage Minimum Input V Bias Pin Current Bias Pin Current
3.6 8.5 25 VBIAS = 5V V 3.4 8.0 OUT = 5V V 20 IN = 12V ILOAD = 1A 3.2 7.5 15 TAGE (V) 3.0 7.0 10 2.8 INPUT VOL 6.5 BIAS PIN CURRENT (mA) VBIAS = 5V BIAS PIN CURRENT (mA) V 5 2.6 OUT = 5V 6.0 ILOAD = 1A fSW = 1MHz 2.4 5.5 0 –50 –25 0 25 50 75 100 125 5 10 15 20 25 30 35 40 45 0.2 0.6 1 1.4 1.8 2.2 2.6 3.0 TEMPERATURE (°C) INPUT VOLTAGE (V) SWITCHING FREQUENCY (MHz) 8636 G34 8636 G35 8636 G36 Rev. C 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
