LTM4650-2

3

Rev. 0

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ELECTRICAL CHARACTERISTICS The

l

denotes the specifications which apply over the specified internal

operating junction 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 24.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

IINRUSH(VIN)

Input Inrush Current at Start-Up

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

COUT = 100µF ×3, VOUT = 1.2V

1

A

IQ(VIN)

Input Supply Bias Current

(Both Channel Running)

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

25

240

35

mA

mA

mA

µA

IS(VIN)

Input Supply Current

VIN = 4.5V, VOUT = 1.2V, IOUT = 25A

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

8.4

3.2

A

A

Output Specifications

IOUT1(DC), IOUT2(DC) Output Continuous Current Range

VIN = 12V, VOUT = 1.2V (Note 6)

0

25

A

ΔVOUT1(LINE)/VOUT1

ΔVOUT2(LINE)/VOUT2

Line Regulation Accuracy

VOUT = 1.2V, VIN from 4.5V to 15V,

IOUT = 0A for Each Output

l

0.01

0.1

%/V

ΔVOUT1/VOUT1

ΔVOUT2/VOUT2

Load Regulation Accuracy

For Each Output, VOUT = 1.2V, 0A to 25A,

VIN = 12V (Note 6)

l

0.2

0.75

%

VOUT1(AC), VOUT2(AC) Output Ripple Voltage

For Each Output, IOUT = 0A, COUT = 100µF ×3

Ceramic, 470µF POSCAP, VIN = 12V,

VOUT = 1.2V, Frequency = 500kHz

15

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

400

750

kHz

ΔVOUTSTART

(Each Channel)

(Note 7)

Turn-On Overshoot

COUT = 100µF Ceramic, 470µF POSCAP,

VOUT = 1.2V, IOUT = 0A VIN = 12V

10

mV

tSTART

(Each Channel)

Turn-On Time

COUT = 100µF Ceramic, 470µF POSCAP,

No Load, TRACK/SS with 0.01µF to GND,

VIN = 12V

5

ms

ΔVOUT(LS)

(Each Channel)

(Note 7)

Peak Deviation for Dynamic Load

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

COUT = 22µF ×3 Ceramic, 470µF POSCAP,

VIN = 12V, VOUT = 1.2V

30

mV

tSETTLE

(Each Channel)

(Note 7)

Settling Time for Dynamic Load

Step

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

VIN = 12V, COUT = 100µF, 470µF POSCAP

20

µs

IOUT(PK)

(Each Channel)

Output Current Limit

VIN = 12V, VOUT = 1.2V

35

A

Control Section

VFB1, VFB2

Voltage at VFB Pins

IOUT = 0A, VOUT = 1.2V

l

0.594

0.600

0.606

V

IFB

(Note 5)

–5

–20

nA

VOVL

Feedback Overvoltage Lockout

l

0.64

0.66

0.68

V

TRACK1 (I),

TRACK2 (I)

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

1

1.3

1.5

µA

UVLO

Undervoltage Lockout (Falling)

3.3

V

UVLO Hysteresis

0.6

V

tON(MIN)

Minimum On-Time

(Note 5)

90

ns

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

V