Datasheet LTC3827 (Analog Devices) - 4
| 制造商 | Analog Devices |
| 描述 | Low IQ, Dual, 2-Phase Synchronous Step-Down Controller |
| 页数 / 页 | 36 / 4 — ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply … |
| 文件格式/大小 | PDF / 461 Kb |
| 文件语言 | 英语 |
ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply over the full operating
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LTC3827
ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VIN = 12V, VRUN/SS1, 2 = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
fSYNCMAX Maximum Synchronizable Frequency PLLIN/MODE = External Clock; VPLLLPF = 2V 650 800 kHz IPLLLPF Phase Detector Output Current Sinking Capability fPLLIN/MODE < fOSC –5 μA Sourcing Capability fPLLIN/MODE > fOSC 5 μA
PGOOD Output
VPGL PGOOD Voltage Low IPGOOD = 2mA 0.1 0.3 V IPGOOD PGOOD Leakage Current VPGOOD = 5V ±1 μA VPG PGOOD Trip Level VFB with Respect to Set Regulated Voltage VFB Ramping Negative –12 –10 –8 % VFB Ramping Positive 8 10 12 %
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 4:
The LTC3827 is tested in a feedback loop that servos VITH1, 2 to a may cause permanent damage to the device. Exposure to any Absolute specifi ed voltage and measures the resultant VFB1, 2. 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 LTC3827E is guaranteed to meet performance specifi cations
Note 6:
Rise and fall times are measured using 10% and 90% levels. Delay from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating times are measured using 50% levels. temperature range are assured by design, characterization and correlation
Note 7:
The minimum on-time condition is specifi ed for an inductor with statistical process controls. The LTC3827I is guaranteed to meet peak-to-peak ripple current ≥ 40% of IMAX (see minimum on-time performance specifi cations over the full –40°C to 85°C operating considerations in the Applications Information section). temperature range.
Note 3:
TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formulas: TJ = TA + (PD • 34 °C/W) 3827ff 4
ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VIN = 12V, VRUN/SS1, 2 = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
fSYNCMAX Maximum Synchronizable Frequency PLLIN/MODE = External Clock; VPLLLPF = 2V 650 800 kHz IPLLLPF Phase Detector Output Current Sinking Capability fPLLIN/MODE < fOSC –5 μA Sourcing Capability fPLLIN/MODE > fOSC 5 μA
PGOOD Output
VPGL PGOOD Voltage Low IPGOOD = 2mA 0.1 0.3 V IPGOOD PGOOD Leakage Current VPGOOD = 5V ±1 μA VPG PGOOD Trip Level VFB with Respect to Set Regulated Voltage VFB Ramping Negative –12 –10 –8 % VFB Ramping Positive 8 10 12 %
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 4:
The LTC3827 is tested in a feedback loop that servos VITH1, 2 to a may cause permanent damage to the device. Exposure to any Absolute specifi ed voltage and measures the resultant VFB1, 2. 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 LTC3827E is guaranteed to meet performance specifi cations
Note 6:
Rise and fall times are measured using 10% and 90% levels. Delay from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating times are measured using 50% levels. temperature range are assured by design, characterization and correlation
Note 7:
The minimum on-time condition is specifi ed for an inductor with statistical process controls. The LTC3827I is guaranteed to meet peak-to-peak ripple current ≥ 40% of IMAX (see minimum on-time performance specifi cations over the full –40°C to 85°C operating considerations in the Applications Information section). temperature range.
Note 3:
TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formulas: TJ = TA + (PD • 34 °C/W) 3827ff 4