LTM4677 datasheet(3/36 Pages) LINER

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LTM4650A-1

4650a1f

For more information www.linear.com/LTM4650A-1

ELECTRICAL CHARACTERISTICS The

denotes the specifications which apply over the specified internal

operating temperature range. Specified as each individual output channel. TA = 25°C (Note 2), VIN = 12V and VRUN1, VRUN2 at 5V

unless otherwise noted. Per the typical application in Figure 34.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Input Specifications

VRUN1, VRUN2

RUN Pin On/Off Threshold

RUN Rising

1.1

1.25

1.40

VRUN1HYS, VRUN2HYS

RUN Pin On Hysteresis

150

IINRUSH(VIN)

Input Inrush Current at Start-Up

IOUT = 0A, CIN = 22µF ×3, CSS = 0.01µF,

COUT = 100µF ×3, VOUT1 = 1.2V, VOUT2 = 1.2V,

VIN = 12V

IQ(VIN)

Input Supply Bias Current

(Both Channels On)

VIN = 12V, VOUT = 1.2V, Burst Mode Operation

VIN = 12V, VOUT = 1.2V, Pulse-Skipping Mode

VIN = 12V, VOUT= 1.2V, Switching Continuous

Shutdown, RUN = 0, VIN = 12V

4.5

115

µA

IS(VIN)

Input Supply Current

VIN = 5V, VOUT = 1.2V, IOUT = 25A

VIN = 12V, VOUT = 1.2V, IOUT = 25A

8.2

3.1

Output Specifications

IOUT1(DC), IOUT2(DC)

Output Continuous Current Range VIN = 12V, VOUT = 1.2V (Note 6)

ΔVOUT1(LINE)/VOUT1

ΔVOUT2(LINE)/VOUT2

Line Regulation Accuracy

For Each Output, VOUT = 1.2V, IOUT = 0A,

VIN from 4.5V to 16V

0.02

0.1

%/V

ΔVOUT1/VOUT1

ΔVOUT2/VOUT2

Load Regulation Accuracy

For Each Output, VIN = 12V, VOUT = 1.2V,

IOUT from 0A to 25A

0.1

0.4

VOUT1(AC), VOUT2(AC)

Output Ripple Voltage

For Each Output, VIN = 12V, VOUT = 1.2V,

Frequency = 450kHz, IOUT = 0A, COUT =

100µF ×3 Ceramic, 470µF POSCAP

mVP-P

fS (Each Channel)

Output Ripple Voltage Frequency VIN = 12V, VOUT = 1.2V, fSET = 1.25V (Note 4)

500

kHz

fSYNC (Each Channel)

SYNC Capture Range

250

780

kHz

ΔVOUTSTART

(Each Channel)

Turn-On Overshoot

COUT = 100µF ×3 Ceramic, 470µF POSCAP,

VIN = 12V , VOUT = 1.2V, IOUT = 0A

tSTART

(Each Channel)

Turn-On Time

COUT = 100µF ×3 Ceramic, 470µF POSCAP,

VIN = 12V, No Load, TRACK/SS with 0.01µF

to GND

ΔVOUT(LS)

(Each Channel)

Peak Deviation for Dynamic Load Load: 0% to 50% to 0% of Full Load

COUT = 100µF ×3 Ceramic, 470µF POSCAP,

VIN = 12V, VOUT = 1.2V

tSETTLE

(Each Channel)

Settling Time for Dynamic Load

Step

Load: 0% to 50% to 0% of Full Load,

VIN = 12V, COUT = 100µF ×3 Ceramic,

470µF POSCAP

µs

IOUT(PK) (Each Channel) Output Current Limit

VIN = 12V, VOUT = 1.2V

Control Section

VFB1, VFB2

Voltage at VFB Pins

IOUT = 0A, VOUT = 1.2V

0.595

0.600

0.605

IFB

(Note 5)

–5

–20

VOVL

Feedback Overvoltage Lockout

0.64

0.66

0.68

ITRACK1, ITRACK2

Track Pin Soft-Start Pull-Up Current TRACK1,TRACK2 Start at 0V

1.25

1.5

µA

UVLO

Undervoltage Lockout (Falling)

3.3

UVLO Hysteresis

0.6

tON(MIN)

Minimum On-Time

(Note 5)

RFBHI1, RFBHI2

Resistor Between VOUTS1, VOUTS2

and VFB1, VFB2 Pins for Each Output

60.05

60.4

60.75

kΩ

VPGOOD1, VPGOOD2 Low PGOOD Voltage Low

IPGOOD = 2mA

0.1

0.3

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