Datasheet LTC3729 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | 550kHz, PolyPhase, High Efficiency, Synchronous Step-Down Switching Regulator |
| Pages / Page | 30 / 4 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| File Format / Size | PDF / 356 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the full operating
Model Line for this Datasheet
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LTC3729
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN/SS = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IPLLFLTR Phase Detector Output Current Sinking Capability fPLLIN < fOSC –15 µA Sourcing Capability fPLLIN > fOSC 15 µA RRELPHS Controller 2‑Controller 1 Phase VPHASMD = 0V, Open 180 Deg VPHASMD = 5V 240 Deg CLKOUT Phase (Relative to Controller 1) VPHASMD = 0V 60 Deg VPHASMD = Open 90 Deg VPHASMD = 5V 120 Deg CLKHIGH Clock High Output Voltage 4 V CLKLOW Clock Low Output Voltage 0.2 V
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, Either Controller VEAIN with Respect to Set Output Voltage VEAIN Ramping Negative –6 –7.5 –9.5 % VEAIN Ramping Positive 6 7.5 9.5 %
Differential Amplifier
ADA Gain 0.995 1 1.005 V/V CMRRDA Common Mode Rejection Ratio 0V < VCM < 5V 46 55 dB R + IN Input Resistance Measured at VOS Input 80 kΩ
Note 1:
Absolute Maximum Ratings are those values beyond which
Note 4:
Dynamic supply current is higher due to the gate charge being the life of a device may be impaired. delivered at the switching frequency. See Applications Information.
Note 2:
TJ is calculated from the ambient temperature TA and power
Note 5:
The minimum on‑time condition corresponds to the on inductor dissipation PD according to the following formulas: peak‑to‑peak ripple current ≥40% of IMAX (see Minimum On‑Time LTC3729EG: T Considerations in the Applications Information section). J = TA + (PD • 95°C/W) LTC3729EUH: T
Note 6:
The LTC3729E is guaranteed to meet performance specifications J = TA + (PD • 34°C/W)
Note 3:
The LTC3729 is tested in a feedback loop that servos V from 0°C to 70°C. Specifications over the –40°C to 85°C operating ITH to a specified voltage and measures the resultant V temperature range are assured by design, characterization and correlation EAIN. with statistical process controls. 3729fb 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 Typical Application Related Parts
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN/SS = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IPLLFLTR Phase Detector Output Current Sinking Capability fPLLIN < fOSC –15 µA Sourcing Capability fPLLIN > fOSC 15 µA RRELPHS Controller 2‑Controller 1 Phase VPHASMD = 0V, Open 180 Deg VPHASMD = 5V 240 Deg CLKOUT Phase (Relative to Controller 1) VPHASMD = 0V 60 Deg VPHASMD = Open 90 Deg VPHASMD = 5V 120 Deg CLKHIGH Clock High Output Voltage 4 V CLKLOW Clock Low Output Voltage 0.2 V
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, Either Controller VEAIN with Respect to Set Output Voltage VEAIN Ramping Negative –6 –7.5 –9.5 % VEAIN Ramping Positive 6 7.5 9.5 %
Differential Amplifier
ADA Gain 0.995 1 1.005 V/V CMRRDA Common Mode Rejection Ratio 0V < VCM < 5V 46 55 dB R + IN Input Resistance Measured at VOS Input 80 kΩ
Note 1:
Absolute Maximum Ratings are those values beyond which
Note 4:
Dynamic supply current is higher due to the gate charge being the life of a device may be impaired. delivered at the switching frequency. See Applications Information.
Note 2:
TJ is calculated from the ambient temperature TA and power
Note 5:
The minimum on‑time condition corresponds to the on inductor dissipation PD according to the following formulas: peak‑to‑peak ripple current ≥40% of IMAX (see Minimum On‑Time LTC3729EG: T Considerations in the Applications Information section). J = TA + (PD • 95°C/W) LTC3729EUH: T
Note 6:
The LTC3729E is guaranteed to meet performance specifications J = TA + (PD • 34°C/W)
Note 3:
The LTC3729 is tested in a feedback loop that servos V from 0°C to 70°C. Specifications over the –40°C to 85°C operating ITH to a specified voltage and measures the resultant V temperature range are assured by design, characterization and correlation EAIN. with statistical process controls. 3729fb 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 Typical Application Related Parts
