Datasheet LTC3854 (Analog Devices) - 4
| Fabricante | Analog Devices |
| Descripción | Small Footprint, Wide VIN Range Synchronous Step-Down DC/DC Controller |
| Páginas / Página | 28 / 4 — ELECTRICAL CHARACTERISTICS Note 1:. Note 4:. Note 5. Note 2:. Note 6:. … |
| Formato / tamaño de archivo | PDF / 547 Kb |
| Idioma del documento | Inglés |
ELECTRICAL CHARACTERISTICS Note 1:. Note 4:. Note 5. Note 2:. Note 6:. Note 7:. Note 8:. Note 3:. TYPICAL PERFORMANCE CHARACTERISTICS
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LTC3854
ELECTRICAL CHARACTERISTICS Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 4:
The LTC3854 is tested in a feedback loop that servos VITH to a may cause permanent damage to the device. Exposure to any Absolute specified voltage and measures the resultant VFB. Maximum Rating condition for extended periods may affect device
Note 5
: Dynamic supply current is higher due to the gate charge being reliability and lifetime. delivered at the switching frequency. See Applications Information.
Note 2:
The LTC3854E is guaranteed to meet performance specifications
Note 6:
Rise and fall times are measured using 10% and 90% levels. Delay from 0°C to 85°C. Specifications over the –40°C to 85°C operating times are measured using 50% levels. Not 100% tested in production. temperature range are assured by design, characterization and correlation
Note 7:
The minimum on-time condition is specified for an inductor peak- with statistical process controls. The LTC3854I is guaranteed to meet to-peak ripple current 40% of I performance specifications over the full –40°C to 85°C operating MAX (see Minimum On-Time Considerations in the Applications Information section). temperature range.
Note 8:
The LTC3854 maximum LDO current specification assumes there
Note 3:
TJ is calculated from the ambient temperature TA and power is no external DC load current being pulled from INTV dissipation PD according to the following formulas: CC pin. LTC3854DDB: TJ = TA + (PD • 76°C/W) LTC3854MSE: TJ = TA + (PD • 40°C/W)
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency vs Output Current Efficiency vs Input Voltage
100 99 V V V OUT = 5V IN = 6V OUT = 5V 98 VIN = 12V 98 96 VIN = 24V 97 94 IOUT = 5A VIN = 32V 96 92 EFFICIENCY (%) EFFICIENCY (%) 95 90 IOUT = 10A 88 94 (SEE FIGURE 9) (SEE FIGURE 9) 86 93 1 2 3 4 5 6 7 8 9 10 5 10 15 20 25 30 35 40 LOAD CURRENT (A) VIN (V) 3854 G01 3854 G02
Top Gate and Bottom Gate in Top Gate and Bottom Gate in 5A Load Step VOUT = 5V, VIN = 24V Forced Continuous Mode Dropout
5VOUT 200mV/DIV BG BG ILOAD 10A/DIV TG 5A/DIV TG LOAD STEP 50µs/DIV 3854 G03 4µs/DIV 3854 G04 4µs/DIV 3854 G05 3854fb 4 Document Outline Features Description Applications 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 Related Parts
ELECTRICAL CHARACTERISTICS Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 4:
The LTC3854 is tested in a feedback loop that servos VITH to a may cause permanent damage to the device. Exposure to any Absolute specified voltage and measures the resultant VFB. Maximum Rating condition for extended periods may affect device
Note 5
: Dynamic supply current is higher due to the gate charge being reliability and lifetime. delivered at the switching frequency. See Applications Information.
Note 2:
The LTC3854E is guaranteed to meet performance specifications
Note 6:
Rise and fall times are measured using 10% and 90% levels. Delay from 0°C to 85°C. Specifications over the –40°C to 85°C operating times are measured using 50% levels. Not 100% tested in production. temperature range are assured by design, characterization and correlation
Note 7:
The minimum on-time condition is specified for an inductor peak- with statistical process controls. The LTC3854I is guaranteed to meet to-peak ripple current 40% of I performance specifications over the full –40°C to 85°C operating MAX (see Minimum On-Time Considerations in the Applications Information section). temperature range.
Note 8:
The LTC3854 maximum LDO current specification assumes there
Note 3:
TJ is calculated from the ambient temperature TA and power is no external DC load current being pulled from INTV dissipation PD according to the following formulas: CC pin. LTC3854DDB: TJ = TA + (PD • 76°C/W) LTC3854MSE: TJ = TA + (PD • 40°C/W)
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency vs Output Current Efficiency vs Input Voltage
100 99 V V V OUT = 5V IN = 6V OUT = 5V 98 VIN = 12V 98 96 VIN = 24V 97 94 IOUT = 5A VIN = 32V 96 92 EFFICIENCY (%) EFFICIENCY (%) 95 90 IOUT = 10A 88 94 (SEE FIGURE 9) (SEE FIGURE 9) 86 93 1 2 3 4 5 6 7 8 9 10 5 10 15 20 25 30 35 40 LOAD CURRENT (A) VIN (V) 3854 G01 3854 G02
Top Gate and Bottom Gate in Top Gate and Bottom Gate in 5A Load Step VOUT = 5V, VIN = 24V Forced Continuous Mode Dropout
5VOUT 200mV/DIV BG BG ILOAD 10A/DIV TG 5A/DIV TG LOAD STEP 50µs/DIV 3854 G03 4µs/DIV 3854 G04 4µs/DIV 3854 G05 3854fb 4 Document Outline Features Description Applications 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 Related Parts