LTC3732 查看數據表（PDF） - Linear Technology

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LTC3732

3-Phase, 5-Bit VID, 600kHz, Synchronous Buck Switching Regulator Controller

Linear Technology 

LTC3732

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

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

SYMBOL PARAMETER

CONDITIONS

MIN TYP MAX UNITS

Oscillator and Phase-Locked Loop

fNOM

fLOW

fHIGH

RPLLTH

RPLL IN

IPLLFLTR

RRELPHS

Nominal Frequency

Lowest Frequency

Highest Frequency

PLLIN Input Threshold

PLLIN Input Resistance

Phase Detector Output Current

Sinking Capability

Sourcing Capability

Controller 2-Controller 1 Phase

Controller 3-Controller 1 Phase

VPLLFLTR = 1.2V

VPLLFLTR = 0V

VPLLFLTR = 2.4V

Minimum Pulse Width >100ns

fPLLIN < fOSC

fPLLIN > fOSC

360 400 440

kHz

190 225 260

kHz

600 680 750

kHz

1

V

50

kΩ

20

µA

20

µA

120

Deg

240

Deg

Differential Amplifier

AV

Differential Gain

VOS

Input Offset Voltage

IN+ = IN– = 1.2V, IOUT = 1mA,

Input Referred; Gain = 1

0.995 1.000 1.005

V/V

0.5

5

mV

CM

CMRR

Common Mode Input Voltage Range

Common Mode Rejection Ratio

0V < IN+ = IN– < 5V, IOUT = 1mA, Input Referred

0

VCC

V

50

70

dB

ICL

GBP

SR

VO(MAX)

RIN

Output Current

Gain Bandwidth Product

Slew Rate

Maximum High Output Voltage

Input Resistance

IOUT = 1mA

RL = 2k

IOUT = 1mA

Measured at IN+ Pin

10

40

mA

2

MHz

5

V/µs

VCC – 1.2 VCC –␣ 0.8

V

80

kΩ

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

of a device may be impaired. A maximum current of 200µA is allowed to

pull-up the RUN/SS pin to prevent overcurrent shutdown.

Note 2: TJ is calculated from the ambient temperature TA and power

dissipation PD according to the following formula:

LTC3732CG: TJ = TA + (PD × 95°C/W)

LTC3732CUHF: TJ = TA + (PD × 34°C/W)

Note 3: The IC is tested in a feedback loop that includes the differential

amplifier in a unity-gain configuration loaded with 100µA to ground driving

the VID DAC into the error amplifier and servoing the resultant voltage to

the midrange point for the error amplifier (VITH = 1.2V).

Note 4: Dynamic supply current is higher due to the gate charge being

delivered at the switching frequency. See Applications Information.

Note 5: The minimum on-time condition corresponds to an inductor peak-

to-peak ripple current of ≥ 40% of IMAX (see minimum on-time

considerations in the Applications Information Section).

Note 6: ATTENERR specification is in addition to the output voltage

accuracy specified at VID code = 11111.

Note 7: This IC includes overtemperature protection that is intended to

protect the device during momentary overload conditions. Junction

temperature will exceed 125°C when overtemperature protection is active.

Continuous operation above the specified maximum operating junction

temperature may impair device reliability.

3732f

4

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