Datasheet LT8640S-2, LT8643S-2 (Analog Devices) - 8
| Manufacturer | Analog Devices |
| Description | 42V, 6A Synchronous Step-Down Silent Switcher with 2.5µA Quiescent Current |
| Pages / Page | 30 / 8 — TYPICAL PERFORMANCE CHARACTERISTICS. LT8643S-2 Error Amp Output. … |
| File Format / Size | PDF / 2.6 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. LT8643S-2 Error Amp Output. LT8643S-2 Soft-Start Tracking. Soft-Start Current. Current
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LT8640S-2/LT8643S-2
TYPICAL PERFORMANCE CHARACTERISTICS LT8643S-2 Error Amp Output LT8643S-2 Soft-Start Tracking Soft-Start Current 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 FB VOL 1.7 –125 0.4 PIN CURRENT (µA) V C TR/SS PIN CURRENT (µA) 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 –200 –100 0 100 200 TR/SS VOLTAGE (V) TEMPERATURE (°C) FB PIN ERROR VOLTAGE (mV) 8640s2 G28 8640s2 G29 8640s2 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 FB RISING 150 FB RISING 8.0 –8.0 125 7.5 –8.5 FB FALLING 100 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 –50 –25 0 25 50 75 100 125 0.2 0.6 1 1.4 1.8 2.2 2.6 3 TEMPERATURE (°C) TEMPERATURE (°C) SWITCHING FREQUENCY (MHz) 8640s2 G31 8640s2 G32 8640s2 G33
Minimum Input Voltage 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) 2.6 VOUT = 5V 5 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) 8640s2 G34 8640s2 G35 8640s2 G36 Rev 0 8 For more information www.analog.com Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION E LECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS BLOCK DIAGRAM OPERATION APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION TYPICAL APPLICATIONS RELATED PARTS
TYPICAL PERFORMANCE CHARACTERISTICS LT8643S-2 Error Amp Output LT8643S-2 Soft-Start Tracking Soft-Start Current 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 FB VOL 1.7 –125 0.4 PIN CURRENT (µA) V C TR/SS PIN CURRENT (µA) 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 –200 –100 0 100 200 TR/SS VOLTAGE (V) TEMPERATURE (°C) FB PIN ERROR VOLTAGE (mV) 8640s2 G28 8640s2 G29 8640s2 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 FB RISING 150 FB RISING 8.0 –8.0 125 7.5 –8.5 FB FALLING 100 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 –50 –25 0 25 50 75 100 125 0.2 0.6 1 1.4 1.8 2.2 2.6 3 TEMPERATURE (°C) TEMPERATURE (°C) SWITCHING FREQUENCY (MHz) 8640s2 G31 8640s2 G32 8640s2 G33
Minimum Input Voltage 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) 2.6 VOUT = 5V 5 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) 8640s2 G34 8640s2 G35 8640s2 G36 Rev 0 8 For more information www.analog.com Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION E LECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS BLOCK DIAGRAM OPERATION APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION TYPICAL APPLICATIONS RELATED PARTS
