Datasheet LTC3649 (Analog Devices) - 6
| Manufacturer | Analog Devices |
| Description | 60V, 4A Synchronous Step-Down Regulator with Rail-to-Rail Programmable Output |
| Pages / Page | 26 / 6 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. … |
| File Format / Size | PDF / 1.7 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Start-up Waveform. VIMON vs Load (Temperature)
Model Line for this Datasheet
Text Version of Document
LTC3649
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Start-up Waveform VIMON vs Load (Temperature) VIMON Error vs Frequency
1.2 0.5 –45°C VIN = 24V V 25°C RUN VOUT = 5V 2V/DIV 1.0 130°C 0 IL 0.8 2A/DIV –0.5 (V) 0.6 VOUT 2V/DIV V IMON –1.0 V 0.4 PGOOD 2V/DIV VIN = 24V –1.5 0.2 VOUT = 5V 3649 G16 1ms/DIV % ERROR NORMALIZED TO 1MHz fSW = 1MHz V R I IN = 24V, RISET = 100kΩ IMON = 10kΩ OUT = 4A RLOAD = 120Ω, L = 2.2µH, fSW = 1MHz 0 –2.0 R 0 0.5 1 1.5 2 2.5 3 3.5 4 300 800 1300 1800 2300 2800 ITH = 4kΩ, CITH = 2.2nF, CITHP = 47pF BURST MODE, COUT = 2× 47µF IOUT (A) FREQUENCY (kHz) 3649 G17 3649 G18
Efficiency vs Load Current at Efficiency vs Load Current at 5VOUT 3.3VOUT
100 100 95 95 90 90 85 85 80 80 75 75 70 70 EFFICIENCY (%) fSW = 500kHz EFFICIENCY (%) fSW = 500kHz 65 L = 6.8µH 65 L = 4.7µH V V 60 IN = 12V IN = 12V V 60 IN = 24V VIN = 24V 55 VIN = 48V 55 VIN = 48V VIN = 60V VIN = 60V 50 50 0 0.5 1 1.5 2 2.5 3 3.5 4 0 0.5 1 1.5 2 2.5 3 3.5 4 LOAD (A) LOAD (A) 3649 G19 3649 G20
Output Capacitor Charging with Load Step with Cable Drop Fixed Average Current Limit Compensation
VRUN VIMON 2V/DIV 1V/DIV IL VOUT 2A/DIV 500mV/DIV VOUT IL 2V/DIV 2A/DIV 3649 G21 20ms/DIV 3649 G22 50ms/DIV VIN = 24V, RISET = 100kΩ CABLE DROP RESISTANCE OF 200mΩ RLOAD = 10Ω, L = 2.2µH RITH = 4kΩ, CITH = 2.2nF, CITHP = 47pF, RIMON = 40kΩ, CIMON = 0.47nF, COUT = 2× 47µF + 36mF 3649fb 6 For more information www.linear.com/LTC3649 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Start-up Waveform VIMON vs Load (Temperature) VIMON Error vs Frequency
1.2 0.5 –45°C VIN = 24V V 25°C RUN VOUT = 5V 2V/DIV 1.0 130°C 0 IL 0.8 2A/DIV –0.5 (V) 0.6 VOUT 2V/DIV V IMON –1.0 V 0.4 PGOOD 2V/DIV VIN = 24V –1.5 0.2 VOUT = 5V 3649 G16 1ms/DIV % ERROR NORMALIZED TO 1MHz fSW = 1MHz V R I IN = 24V, RISET = 100kΩ IMON = 10kΩ OUT = 4A RLOAD = 120Ω, L = 2.2µH, fSW = 1MHz 0 –2.0 R 0 0.5 1 1.5 2 2.5 3 3.5 4 300 800 1300 1800 2300 2800 ITH = 4kΩ, CITH = 2.2nF, CITHP = 47pF BURST MODE, COUT = 2× 47µF IOUT (A) FREQUENCY (kHz) 3649 G17 3649 G18
Efficiency vs Load Current at Efficiency vs Load Current at 5VOUT 3.3VOUT
100 100 95 95 90 90 85 85 80 80 75 75 70 70 EFFICIENCY (%) fSW = 500kHz EFFICIENCY (%) fSW = 500kHz 65 L = 6.8µH 65 L = 4.7µH V V 60 IN = 12V IN = 12V V 60 IN = 24V VIN = 24V 55 VIN = 48V 55 VIN = 48V VIN = 60V VIN = 60V 50 50 0 0.5 1 1.5 2 2.5 3 3.5 4 0 0.5 1 1.5 2 2.5 3 3.5 4 LOAD (A) LOAD (A) 3649 G19 3649 G20
Output Capacitor Charging with Load Step with Cable Drop Fixed Average Current Limit Compensation
VRUN VIMON 2V/DIV 1V/DIV IL VOUT 2A/DIV 500mV/DIV VOUT IL 2V/DIV 2A/DIV 3649 G21 20ms/DIV 3649 G22 50ms/DIV VIN = 24V, RISET = 100kΩ CABLE DROP RESISTANCE OF 200mΩ RLOAD = 10Ω, L = 2.2µH RITH = 4kΩ, CITH = 2.2nF, CITHP = 47pF, RIMON = 40kΩ, CIMON = 0.47nF, COUT = 2× 47µF + 36mF 3649fb 6 For more information www.linear.com/LTC3649 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
