LTM4675 datasheet(3/20 Pages) LINER

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LTC3870-1

38701f

For more information www.linear.com/LTC3870-1

The l denotes the specifications which apply over the specified operating

junction temperature range, otherwise specifications are at TA = 25°C. (Note 2) VIN = 15V, VRUN0,VRUN1 = 3.3V, fSYNC = 350kHz

(externally driven) unless otherwise specified.

elecTrical characTerisTics

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VIILIMIT

Maximum Current Sense Threshold (High Range) VITH = 2.22V, ILIM = INTVCC

Maximum Current Sense Threshold (Low Range) VITH = 2.22V, ILIM = GND

PWM Outputs

PWM

PWM Output High Voltage

PWM Output Low Voltage

PWM Output Current in Hi-Z State

ILOAD = 500µA

ILOAD = –500µA

VCC – 0.2

–5

0.2

µA

tON(MIN)

Minimum On-Time

(Note 5)

INTVCC Regulator

VINTVCC_VIN

Internal VCC Voltage No Load

6.0V < VIN < 60V, VEXTVCC = 0V

4.85

5.1

5.35

VLDO INT

INTVCC Load Regulation

ICC = 0mA to 50mA, VEXTVCC = 0V

0.8

±2

VINTVCC_EXT

Internal VCC Voltage No Load

VEXTVCC = 8.5V (Note 6)

4.85

5.1

5.35

VLDO EXT

EXTVCC Load Regulation

ICC = 0mA to 20mA, VEXTVCC = 8.5V

0.5

±2

VEXTVCC

EXTVCC Switchover Voltage

VEXTVCC Ramping Positive (Note 6)

4.65

4.8

4.95

VHYS_EXTVCC

EXTVCC Hysteresis

200

Oscillator and Phase-Locked Loop

fSYNC

Oscillator SYNC Range

100

1000

kHz

VTH,SYNC

SYNC Input Threshold

VTH,SYNC Falling (Note 7)

VTH,SYNC Rising

0.4

2.0

fNOM

Nominal Frequency

VFREQ = 1.0V

500

kHz

IFREQ

FREQ Setting Current

µA

θSYNC-θ0

SYNC to Ch0 Phase Relationship Based on the

Falling Edge of SYNC and Rising Edge of PWM0

PHASMD =0

PHASMD = 1/3 INTVCC

PHASMD = 2/3 INTVCC

PHASMD = INTVCC

180

120

Deg

θSYNC-θ1

SYNC to Ch1 Phase Relationship Based on the

Falling Edge of SYNC and Rising Edge of PWM1

PHASMD = 0

PHASMD = 1/3 INTVCC

PHASMD = 2/3 INTVCC

PHASMD = INTVCC

300

240

270

Deg

Digital Inputs RUN0/RUN1, MODE0/MODE1, FAULT0/FAULT1

VIH

Input High Threshold Voltage

2.0

VIL

Input Low Threshold Voltage

1.4

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: The LTC3870-1 is tested under pulsed load conditions such that

TJ ≈ TA. The LTC3870E-1 is guaranteed to meet specifications from

0°C to 85°C junction temperature. Specifications over the –40°C to

125°C operating junction temperature range are assured by design,

characterization and correlation with statistical process controls. The

LTC3870I-1 is guaranteed over the full –40°C to 125°C operating

junction temperature range. Note that the maximum ambient temperature

consistent with these specifications is determined by specific operating

conditions in conjunction with board layout, the related package thermal

impedance and other environmental factors. The junction temperature TJ

is calculated from the ambient temperature TA and power dissipation PD

according to the following formula:

TJ = TA + (PD • 46.9°C/W)

Note 3: When VIN >15V, EXTVCC is recommended to reduce IC Temperature.

Note 4: Output voltage is set and controlled by the master controller in

multiphase operations.

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

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

Considerations in the Applications Information section).

Note 6: EXTVCC is enabled only if VIN is higher than 6.5V.

Note 7: Guaranteed by design.

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