Datasheet LTC3773 (Analog Devices) - 4

LTC3773
ELECTRICAL CHARACTERISTICS (Note 3) The
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denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VCC = VDR = VBOOST = VSDB = 5V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Power Good Output Indication
VPGL PGOOD Voltage Output Low IPGOOD = 2mA 0.1 0.3 V IPGOOD PGOOD Output Leakage VPGOOD = 5V 1 μA PGOOD Trip Thresholds VFB with Respect to 0.6V Reference VPGTHNEG VFB Ramping Negative PGOOD Goes Low After VPGDLY Delay –7 –10 –13 % VPGTHPOS VFB Ramping Positive 7 10 13 % VPGDLY PGOOD Delay 100 150 μs
Oscillator and Phase-Locked Loop
fNOM Nominal Frequency VPLLFLTR Open 360 400 440 kHz fLOW Low Frequency VPLLFLTR = 0V 190 220 250 kHz fHIGH High Frequency VPLLFLTR = 5V 510 560 630 kHz fPLLLOW PLLIN Minimum Input Frequency 160 200 kHz fPLLHIGH PLLIN Maximum Input Frequency 540 700 kHz PLLIN/FC, PHASEMD, PLLFLTR Logic Input VLO Low Level Input Voltage 1.0 V VFLOAT Floating Voltage 1.6 V VHI High Level Input Voltage 3.0 V VPLLIN PLLIN Synchronization Input Threshold 1 V IPLLFLTR Phase Detector Output Current VPLLFLTR = 1.5V Sinking Capability fPLLIN < fOSC 25 μA Sourcing Capability fPLLIN > fOSC –25 μA PRELPHS Controller 2 - Controller 1 Phase PHASEMD Floats or VPHASEMD = 0V 120 Deg Controller 3 - Controller 1 Phase 240 Deg Controller 2 - Controller 1 Phase VPHASEMD = 5V 90 Deg Controller 3 - Controller 1 Phase 270 Deg CLKOUT Controller 1 TG to CLKOUT Phase PHASEMD Floats 0 Deg VPHASEMD = 0V 60 Deg VPHASEMD = 5V 180 Deg
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
All currents into device pins are positive; all currents out of device may cause permanent damage to the device. Exposure to any Absolute pins are negative. All voltages are referenced to ground unless otherwise Maximum Rating condition for extended periods may affect device specifi ed. reliability and lifetime.
Note 4:
The IC is tested in a feedback loop that adjusts VFB to achieve a
Note 2:
The LTC3773 is guaranteed to meet performance specifi cations specifi ed error amplifi er output voltage (VITH). from 0°C to 85°C. Specifi cations over the – 40°C to 85°C operating
Note 5:
Guaranteed by design, not subject to test. temperature range are assured by design, characterization and correlation
Note 6:
Dynamic supply current is higher due to the gate charge being with statistical process controls. TJ is calculated from the ambient delivered at the switching frequency. See Applications Information. temperature TA and power dissipation PD according to the following
Note 7:
R formula. DS(ON) limit is guaranteed by design and/or correlation to static test. LTC3773EG: TJ = TA + (PD x 95°C/W)
Note 8:
The minimum on-time condition corresponds to an inductor LTC3773EUHF: TJ = TA + (PD x 34°C/W) peak-to-peak ripple current of ≥40% of IMAX (see minimum on-time considerations in the Applications Information section). 3773fb 4