LTM4645 datasheet(3/34 Pages) LINER

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LTM4646

4646f

For more information www.linear.com/LTM4646

ELECTRICAL CHARACTERISTICS The

denotes the specifications which apply over the specified internal

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

unless otherwise noted. Per the typical application in Figure 18.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VIN(DC)

Input DC Voltage

2.375V with 5V External Bias on CPWR, 4.5V

Min without Bias

2.375

VCPWR(DC)

Input Control Power Voltage

Input Range of Bias

Normally Connected to VIN

4.5

VOUT1, 2 (Range)

Output Voltage Range

(Note 8)

0.6

5.5

VOUT1(DC),

VOUT2(DC)

Output Voltage, Total Variation

with Line and Load

CIN = 10µF 4, COUT = 100µF 4, Ceramic VOUT

= 1.5V

1.4775

1.5

1.5225

Input Specifications

VRUN1, VRUN2

RUN Pin On/Off Threshold

RUN Rising

1.1

1.2

1.3

VRUN1HYS, VRUN2HYS RUN Pin On Hysteresis

160

RRUN1, RRUN2

RUN1, RUN2 Resistance

Pull-Down Resistance

100

kΩ

IINRUSH(VIN)

Input Inrush Current at Start-Up

IOUT = 0A, CIN = 10µF ×4, CSS = 0.01µF,

COUT = 100µF ×4, VOUT1 = 1.5V, VOUT2 = 1.5V,

VIN = 12V

IQ(VIN)

Input Supply Bias Current

IOUT = 0.1A, fSW = 1MHz, Pulse-Skipping Mode

IOUT = 0.1A, fSW = 1MHz, Switching Continuous

Shutdown, RUN = 0, VIN = 12V

µA

IS(VIN)

Input Supply Current

VIN = 4.5V, VOUT = 1.5V, IOUT = 10A, fSW = 1MHz

VIN = 12V, VOUT = 1.5V, IOUT = 10A, fSW = 1MHz

3.9

1.45

Output Specifications

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

VIN = 12V, VOUT = 1.5V (Notes 7, 8)

∆VOUT1(LINE)/VOUT1

∆VOUT2(LINE)/VOUT2

Line Regulation Accuracy

VOUT = 1.5V, VIN from 4.5V to 20V

IOUT = 0A for Each Output

0.01

0.025

%/V

∆VOUT1(LOAD)/VOUT1

∆VOUT2(LOAD)/VOUT2

Load Regulation Accuracy

For Each Output, VOUT = 1.5V, 0A to 10A

VIN = 12V (Note 7)

0.15

0.3

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

For Each Output, IOUT = 0A, COUT = 100µF ×4,

VOUT = 1.5V, Frequency = 350kHz

mVP-P

fS (Each Channel)

Output Ripple Voltage Frequency

VIN = 12V, VOUT = 1.5V, RFREQ = 115kΩ (Note 4)

350

kHz

∆VOUTSTART

(Each Channel)

Turn-On Overshoot

COUT = 100µF ×4, VOUT = 1.5V, IOUT = 0A VIN =

12V, CSS = 0.01µF

tSTART

(Each Channel)

Turn-On Time

COUT = 100µF ×4, No Load, TRACK/SS with

0.01µF to GND, VIN = 12V

∆VOUT(LS)

(Each Channel)

Peak Deviation for Dynamic Load

Load: 0A to 6A to 0A

COUT = 100µF ×4

VIN = 12V, VOUT = 1.5V

tSETTLE

(Each Channel)

Settling Time for Dynamic Load Step Load: 0A to 6A to 0A

COUT = 100µF ×4

VIN = 12V, VOUT = 1.5V

µs

IOUT(PK)

(Each Channel)

Output Current Limit

VIN = 12V, VOUT = 1.5V

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