LTC3719EG 查看數據表（PDF） - Linear Technology

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LTC3719EG

2-Phase, High Efficiency, Step-Down Controller for AMD Opteron™ CPUs

Linear Technology 

LTC3719

ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VBIAS = 5V, VRUN/SS = 5V unless otherwise noted.

SYMBOL PARAMETER

Oscillator and Phase-Locked Loop

fNOM

fLOW

fHIGH

RPLLIN

IPLLFLTR

Nominal Frequency

Lowest Frequency

Highest Frequency

PLLIN Input Resistance

Phase Detector Output Current

Sinking Capability

Sourcing Capability

RRELPHS Controller 2-Controller 1 Phase

PGOOD Output

VPGL

IPGOOD

VPG

PGOOD Voltage Low

PGOOD Leakage Current

PGOOD Trip Level, Either Controller

Differential Amplifier/Op Amp Gain Block

ADA

CMRRDA

RIN

Differential Amplifier Gain

Common Mode Rejection Ratio

Input Resistance

CONDITIONS

VPLLFLTR = 1.2V

VPLLFLTR = 0V

VPLLFLTR ≥ 2.4V

fPLLIN < fOSC

fPLLIN > fOSC

IPGOOD = 2mA

VPGOOD = 5V

VEAIN with Respect to Set Output Voltage

VEAIN Ramping Negative

VEAIN Ramping Positive

VAMPMD = 0V

0V < VCM < 5V; VAMPMD = 0V

Measured at VOS + Input; VAMPMD = 0V

MIN TYP MAX UNITS

190 220 250

kHz

120 140 160

kHz

280 310 360

kHz

50

kΩ

– 15

µA

15

µA

180

Deg

0.1

0.3

V

±1

µA

–8

– 10 – 12

%

8

10

12

%

0.995

1

1.005

V/V

46

55

dB

80

kΩ

Note 1: Absolute Maximum Ratings are those values beyond which the

life of a device may be impaired.

Note 2: The LTC3719EG is guaranteed to meet performance specifications

from 0°C to 70°C. Specifications over the – 40°C to 85°C operating

temperature range are assured by design, characterization and correlation

with statistical process controls.

Note 3: TJ is calculated from the ambient temperature TA and power

dissipation PD according to the following formula:

LTC3719EG: TJ = TA + (PD • 85°C/W)

Note 4: The LTC3719 is tested in a feedback loop that servos VITH to a

specified voltage and measures the resultant VEAIN.

Note 5: Dynamic supply current is higher due to the gate charge being

delivered at the switching frequency. See Applications Information.

Note 6: Rise and fall times are measured using 10% and 90% levels. Delay

times are measured using 50% levels.

Note 7: The minimum on-time condition corresponds to the on inductor

peak-to-peak ripple current ≥ 40% IMAX (see Minimum On-Time

Considerations in the Applications Information section).

Note 8: Each built-in pull-up resistor attached to the VID inputs also has a

series diode to allow input voltages higher than the VIDVCC supply without

damage or clamping (see the Applications Information section).

4

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