LTM4642IY Ver la hoja de datos (PDF) - Linear Technology

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Fabricante

LTM4642IY

20VIN, Dual 4A or Single 8A DC/DC µModule Regulator

Linear Technology 

LTM4642

electrical characteristics The l 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

DFMAX

tON(MIN)

tOFF(MIN)

fLOW

fNOM

fHIGH

RMODE/PLLIN

VPLLIN(HIGH)

VPLLIN(LOW)

VRUN1, 2

VRUN1, 2(HYS)

IRUN1,2

IRUN1,2(HYS)

RUN1,2 Res

Soft-Start Charge Current

0V < TRACK/SS1,2 < 0.6V

Maximum Duty Factor

In Dropout (Note 4)

Minimum On-Time

(Note 4)

Minimum Off-Time

(Note 4)

Low Frequency

Nominal Frequency

Highest Frequency

MODE/PLLIN Input Resistance

RFREQ = 61.9k

RFREQ = 49.9k

RFREQ = 27.5k

MODE/PLLIN Clock In High

MODE/PLLIN Clock In Low

RUN Pin ON/OFF Threshold

RUN Rising

RUN1, 2, Threshold Hysteresis Delta RUN Rising to RUN Falling

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

RUN1,2 Pull-Up Hysteresis

RUN1,2 Resistance to Ground

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

1.0

µA

97

%

30

ns

90

ns

600 650 700

kHz

730 800 850

kHz

1250 1400 1500 kHz

600

kΩ

2

V

0.5

V

l 1.1 1.2 1.3

V

200

mV

1.2

µA

5

µA

100

kΩ

UVLO

Undervoltage Lockout

RFB1, RFB2

VPGL

IPGOOD

ΔVPGOOD

Resistor Between VOUT and VFB

Pins for Each Channel

PGOOD Voltage Low

PGOOD Leakage Current

PGOOD Range

Ch 2 Phase

Channel 2 Phase (Relative to

Channel 1)

CLKOUT Phase CLKOUT Phase (Relative to

Channel 1)

INTVCC Falling (Note 4)

INTVCC Rising

IPGOOD = 2mA

VPGOOD = 5V

VFB Ramping Negative

VFB Ramping Positive

PHASMD = SGND

PHASMD = Floating

PHASMD = INTVCC

PHASMD = SGND

PHASMD = Floating

PHASMD = INTVCC

l 3.3 3.7

V

l

4.2 4.5

V

60.1 60.4 60.7

kΩ

0.1 0.3

V

±2

µA

–5 –7.5 –10

%

5

7.5 10

%

180

Deg

180

Deg

240

Deg

60

Deg

90

Deg

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.

4642fb

4

For more information www.linear.com/LTM4642

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