Datasheet LTC3874-1 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | PolyPhase Step-Down Synchronous Slave Controller with Sub-Milliohm DCR Sensing |
| Pages / Page | 22 / 4 — elecTrical characTerisTics. Note 1:. Note 2:. Note 3:. Note 4:. Note 5: |
| File Format / Size | PDF / 1.0 Mb |
| Document Language | English |
elecTrical characTerisTics. Note 1:. Note 2:. Note 3:. Note 4:. Note 5:
Model Line for this Datasheet
Text Version of Document
LTC3874-1
elecTrical characTerisTics Note 1:
Stresses beyond those listed under Absolute Maximum Ratings conditions in conjunction with board layout, the related package thermal may cause permanent damage to the device. Exposure to any Absolute impedance and other environmental factors. The junction temperature TJ Maximum Rating condition for extended periods may affect device is calculated from the ambient temperature TA and power dissipation PD reliability and lifetime. according to the following formula: TJ = TA + (PD • 46.9°C/W)
Note 2:
The LTC3874-1 is tested under pulsed load conditions such
Note 3:
Output voltage is set and controlled by master controller in that TJ ≈ TA. The LTC3874E-1 is guaranteed to meet specifications multiphase operations. from 0°C to 85°C junction temperature. Specifications over the –40°Ç
Note 4:
The minimum on-time condition corresponds to an inductor to 125°C operating junction temperature range are assured by design, peak-to-peak ripple current ≥40% of IMAX (see Minimum On-Time characterization and correlation with statistical process controls. The Considerations in the Applications Information section). LTC3874I-1 is guaranteed over the –40°C to 125°C operating junction
Note 5:
EXTV temperature range. Note that the maximum ambient temperature CC is enabled only if VIN is higher than 6.5V. consistent with these specifications is determined by specific operating
Typical perForMance characTerisTics (TA = 25°C unless otherwise specified) Efficiency vs Output Current Efficiency vs Output Current Efficiency and Power Loss vs and Mode (4-Phase with Master and Mode (4-Phase with Master Output Current (4-Phase with Controller LTC3884-1) Controller LTC3884-1) Master Controller LTC3884-1)
100 100 100 20 VIN = 12V 90 90 VOUT = 1.8V 95 f 17 80 80 SW = 425kHz CCM 70 70 POWER LOSS (W) 90 EFFICIENCY 14 60 60 50 V V IN = 12V IN = 12V 50 V 85 11 V OUT = 1.2V OUT = 1.8V 40 40 f f SW = 425kHz SW = 425kHz EFFICIENCY (%) EFFICIENCY (%) POWER LOSS EFFICIENCY (%) 8 30 30 80 20 20 0.29mΩ CCM CCM 75 1.5mΩ 5 10 DCM 10 DCM 0.29mΩ 1.5mΩ 0 0 70 2 0 10 20 30 40 50 60 70 80 90 100 110 120 0 10 20 30 40 50 60 70 80 90 100 110 120 0 10 20 30 40 50 60 70 80 90 100 110 120 LOAD CURRENT (A) LOAD CURRENT (A) LOAD CURRENT (A) 38741 G1 38741 G2 38741 G3
Load Step (Forced Continuous Load Step (Discontinuous Mode) 4-Phase with Master Conduction Mode) 4-Phase with Controller LTC3884-1 Master Controller LTC3884-1
ILOAD ILOAD 50A/DIV 50A/DIV IL(MASTER0) I(MASTER0) 10A/DIV 10A/DIV IL(SLAVE0) I(SLAVE0) 10A/DIV 10A/DIV VOUT VOUT AC-COUPLED AC-COUPLED 50mV/DIV 50mV/DIV 50µs/DIV 38741 G04 50µs/DIV 38741 G05 VIN = 12V V V IN = 12V OUT = 1.2V V I OUT = 1.2V LOAD 0A TO 20A ILOAD 0A TO 20A 38741f 4 For more information www.linear.com/LTC3874-1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Operation Applications Information Typical Application Related Parts
elecTrical characTerisTics Note 1:
Stresses beyond those listed under Absolute Maximum Ratings conditions in conjunction with board layout, the related package thermal may cause permanent damage to the device. Exposure to any Absolute impedance and other environmental factors. The junction temperature TJ Maximum Rating condition for extended periods may affect device is calculated from the ambient temperature TA and power dissipation PD reliability and lifetime. according to the following formula: TJ = TA + (PD • 46.9°C/W)
Note 2:
The LTC3874-1 is tested under pulsed load conditions such
Note 3:
Output voltage is set and controlled by master controller in that TJ ≈ TA. The LTC3874E-1 is guaranteed to meet specifications multiphase operations. from 0°C to 85°C junction temperature. Specifications over the –40°Ç
Note 4:
The minimum on-time condition corresponds to an inductor to 125°C operating junction temperature range are assured by design, peak-to-peak ripple current ≥40% of IMAX (see Minimum On-Time characterization and correlation with statistical process controls. The Considerations in the Applications Information section). LTC3874I-1 is guaranteed over the –40°C to 125°C operating junction
Note 5:
EXTV temperature range. Note that the maximum ambient temperature CC is enabled only if VIN is higher than 6.5V. consistent with these specifications is determined by specific operating
Typical perForMance characTerisTics (TA = 25°C unless otherwise specified) Efficiency vs Output Current Efficiency vs Output Current Efficiency and Power Loss vs and Mode (4-Phase with Master and Mode (4-Phase with Master Output Current (4-Phase with Controller LTC3884-1) Controller LTC3884-1) Master Controller LTC3884-1)
100 100 100 20 VIN = 12V 90 90 VOUT = 1.8V 95 f 17 80 80 SW = 425kHz CCM 70 70 POWER LOSS (W) 90 EFFICIENCY 14 60 60 50 V V IN = 12V IN = 12V 50 V 85 11 V OUT = 1.2V OUT = 1.8V 40 40 f f SW = 425kHz SW = 425kHz EFFICIENCY (%) EFFICIENCY (%) POWER LOSS EFFICIENCY (%) 8 30 30 80 20 20 0.29mΩ CCM CCM 75 1.5mΩ 5 10 DCM 10 DCM 0.29mΩ 1.5mΩ 0 0 70 2 0 10 20 30 40 50 60 70 80 90 100 110 120 0 10 20 30 40 50 60 70 80 90 100 110 120 0 10 20 30 40 50 60 70 80 90 100 110 120 LOAD CURRENT (A) LOAD CURRENT (A) LOAD CURRENT (A) 38741 G1 38741 G2 38741 G3
Load Step (Forced Continuous Load Step (Discontinuous Mode) 4-Phase with Master Conduction Mode) 4-Phase with Controller LTC3884-1 Master Controller LTC3884-1
ILOAD ILOAD 50A/DIV 50A/DIV IL(MASTER0) I(MASTER0) 10A/DIV 10A/DIV IL(SLAVE0) I(SLAVE0) 10A/DIV 10A/DIV VOUT VOUT AC-COUPLED AC-COUPLED 50mV/DIV 50mV/DIV 50µs/DIV 38741 G04 50µs/DIV 38741 G05 VIN = 12V V V IN = 12V OUT = 1.2V V I OUT = 1.2V LOAD 0A TO 20A ILOAD 0A TO 20A 38741f 4 For more information www.linear.com/LTC3874-1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Operation Applications Information Typical Application Related Parts
