LTM4620A datasheet(4/32 Pages) LINER

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LTM4642

4642fb

For more information www.linear.com/LTM4642

elecTrical characTerisTics The

denotes the specifications which apply over the full internal

operating temperature range (Note 2), otherwise specifications are at TA = 25°C, VIN = 12V. Per typical application in Figure 27.

Specified as each channel. (Note 3)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

ITRACK/SS1,2

Soft-Start Charge Current

0V < TRACK/SS1,2 < 0.6V

1.0

µA

DFMAX

Maximum Duty Factor

In Dropout (Note 4)

tON(MIN)

Minimum On-Time

(Note 4)

tOFF(MIN)

Minimum Off-Time

(Note 4)

fLOW

Low Frequency

RFREQ = 61.9k

600

650

700

kHz

fNOM

Nominal Frequency

RFREQ = 49.9k

730

800

850

kHz

fHIGH

Highest Frequency

RFREQ = 27.5k

1250

1400

1500

kHz

RMODE/PLLIN

MODE/PLLIN Input Resistance

600

kΩ

VPLLIN(HIGH)

MODE/PLLIN Clock In High

VPLLIN(LOW)

MODE/PLLIN Clock In Low

0.5

VRUN1, 2

RUN Pin ON/OFF Threshold

RUN Rising

1.1

1.2

1.3

VRUN1, 2(HYS)

RUN1, 2, Threshold Hysteresis

Delta RUN Rising to RUN Falling

200

IRUN1,2

RUN Pin Pull-Up Current When Off RUN1,2 at SGND

1.2

µA

IRUN1,2(HYS)

RUN1,2 Pull-Up Hysteresis

IRUN1,2(HYST) = IRUN1,2(ON) – IRUN1,2(OFF) (Note 4)

µA

RUN1,2 Res

RUN1,2 Resistance to Ground

100

kΩ

UVLO

Undervoltage Lockout

INTVCC Falling (Note 4)

INTVCC Rising

3.3

3.7

4.2

4.5

RFB1, RFB2

Resistor Between VOUT and VFB

Pins for Each Channel

60.1

60.4

60.7

kΩ

VPGL

PGOOD Voltage Low

IPGOOD = 2mA

0.1

0.3

IPGOOD

PGOOD Leakage Current

VPGOOD = 5V

±2

µA

ΔVPGOOD

PGOOD Range

VFB Ramping Negative

VFB Ramping Positive

–5

–7.5

7.5

–10

Ch 2 Phase

Channel 2 Phase (Relative to

Channel 1)

PHASMD = SGND

PHASMD = Floating

PHASMD = INTVCC

180

240

Deg

CLKOUT Phase CLKOUT Phase (Relative to

Channel 1)

PHASMD = SGND

PHASMD = Floating

PHASMD = INTVCC

120

Deg

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 LTM4642E is guaranteed to meet performance specifications

over the 0°C to 125°C internal operating temperature range. Specifications

over the full –40°C to 125°C internal operating temperature range are

assured by design, characterization and correlation with statistical process

controls. The LTM4642I is guaranteed to meet specifications over the full

internal operating temperature range. Note that the maximum ambient

temperature consistent with these specifications is determined by specific

operating conditions in conjunction with board layout, the rated package

thermal resistance and other environmental factors.

Note 3: The two outputs are tested separately and the same testing

condition is applied to each output.

Note 4: 100% tested at wafer level only.

Note 5: See Output Current Derating curves for different VIN, VOUT and TA.

Note 6: Consult factory for operation down at 2.375V to 2.5V input.

Operating frequency nominal will be reduced.

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