Datasheet LTC3770 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | Fast No RSENSE Step-Down Synchronous Controller with Margining, Tracking and PLL |
| Pages / Page | 24 / 4 — ELECTRICAL CHARACTERISTICS. The. denotes specifi cations which apply over … |
| File Format / Size | PDF / 273 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes specifi cations which apply over the full operating
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LTC3770
ELECTRICAL CHARACTERISTICS The
l
denotes specifi cations which apply over the full operating temperature range, otherwise specifi cations are TA = 25°C. VIN = 15V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Internal VCC Regulator
VINTVCC Internal VCC Voltage 6V < VIN < 30V l 4.7 5 5.3 V ΔVLDO(LOADREG) Internal VCC Load Regulation ICC = 0mA to 20mA –0.1 ±2 %
Phased-Locked Loop
RPLLIN PLLIN Input Resistance 50 kΩ IPLLFLTR Phase Detector Output Current Sink Capability fPLLIN < f0 –15 μA Source Capability fPLLIN > f0 15 μA
PGOOD Output
ΔVFBH PGOOD Upper Threshold VFB Rising 7 10 13 % ΔVFBL PGOOD Lower Threshold VFB Falling –7 –10 –13 % ΔVFB(HYS) PGOOD Hysteresis VFB Returning 1.5 3 % VPGL PGOOD Low Voltage IPGOOD = 5mA 0.15 0.4 V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 4:
The LTC3770E is guaranteed to meet performance specifi cations may cause permanent damage to the device. Exposure to any Absolute from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating Maximum Rating condition for extended periods may affect device temperature range are assured by design, characterization and correlation reliability and lifetime. with statistical process controls.
Note 2:
TJ is calculated from the ambient temperature TA and power
Note 5:
The minimum off-time condition is specifi ed for large peak-to-peak dissipation PD as follows: inductor ripple current (see Minimum Off-Time Considerations in LTC3770EG: T the Applications Information section). J = TA + (PD • 130°C/W) LTC3770EUH: TJ = TA + (PD • 34°C/W)
Note 3:
The 3770 is tested in a feedback loop that adjusts VFB to achieve a specifi ed error amplifi er output voltage (ITH). For these tests, VREFOUT = VREFIN.
TYPICAL PERFORMANCE CHARACTERISTICS Current Sense Threshold vs ITH Voltage On-Time vs ION Current On-Time vs VON Voltage
300 10000 1200 V V I RNG = 2V VON = 0V ION = 60μA 1000 200 1.4V 1V 1000 800 100 0.7V 0.5V 600 0 ON-TIME (ns) ON-TIME (ns) 100 400 –100 200 CURRENT SENSE THRESHOLD (mV) –200 10 0 0 0.5 1.0 1.5 2.0 2.5 3.0 1 10 100 0 1 2 3 4 5 ITH VOLTAGE (V) ION CURRENT (μA) VON VOLTAGE (V) 3770 G01 3770 G02 3770 G03 3770fc 4
ELECTRICAL CHARACTERISTICS The
l
denotes specifi cations which apply over the full operating temperature range, otherwise specifi cations are TA = 25°C. VIN = 15V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Internal VCC Regulator
VINTVCC Internal VCC Voltage 6V < VIN < 30V l 4.7 5 5.3 V ΔVLDO(LOADREG) Internal VCC Load Regulation ICC = 0mA to 20mA –0.1 ±2 %
Phased-Locked Loop
RPLLIN PLLIN Input Resistance 50 kΩ IPLLFLTR Phase Detector Output Current Sink Capability fPLLIN < f0 –15 μA Source Capability fPLLIN > f0 15 μA
PGOOD Output
ΔVFBH PGOOD Upper Threshold VFB Rising 7 10 13 % ΔVFBL PGOOD Lower Threshold VFB Falling –7 –10 –13 % ΔVFB(HYS) PGOOD Hysteresis VFB Returning 1.5 3 % VPGL PGOOD Low Voltage IPGOOD = 5mA 0.15 0.4 V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 4:
The LTC3770E is guaranteed to meet performance specifi cations may cause permanent damage to the device. Exposure to any Absolute from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating Maximum Rating condition for extended periods may affect device temperature range are assured by design, characterization and correlation reliability and lifetime. with statistical process controls.
Note 2:
TJ is calculated from the ambient temperature TA and power
Note 5:
The minimum off-time condition is specifi ed for large peak-to-peak dissipation PD as follows: inductor ripple current (see Minimum Off-Time Considerations in LTC3770EG: T the Applications Information section). J = TA + (PD • 130°C/W) LTC3770EUH: TJ = TA + (PD • 34°C/W)
Note 3:
The 3770 is tested in a feedback loop that adjusts VFB to achieve a specifi ed error amplifi er output voltage (ITH). For these tests, VREFOUT = VREFIN.
TYPICAL PERFORMANCE CHARACTERISTICS Current Sense Threshold vs ITH Voltage On-Time vs ION Current On-Time vs VON Voltage
300 10000 1200 V V I RNG = 2V VON = 0V ION = 60μA 1000 200 1.4V 1V 1000 800 100 0.7V 0.5V 600 0 ON-TIME (ns) ON-TIME (ns) 100 400 –100 200 CURRENT SENSE THRESHOLD (mV) –200 10 0 0 0.5 1.0 1.5 2.0 2.5 3.0 1 10 100 0 1 2 3 4 5 ITH VOLTAGE (V) ION CURRENT (μA) VON VOLTAGE (V) 3770 G01 3770 G02 3770 G03 3770fc 4
