LTM4642 datasheet(3/32 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

ICPWR

CPWR Bias Current

CPWR = 12V, MODE = Continuous

IQ(VIN)

Input Supply Bias Current

VIN = 12V, VOUT1 = 1.5V, Switching Continuous

VIN = 12V, VOUT2 = 1.5V, Switching Continuous

VIN = 20V, VOUT1 = 1.5V, Switching Continuous

VIN = 20V, VOUT2 = 1.5V, Switching Continuous

Shutdown, RUN = 0, VIN = 12V

µA

IQ(VIN)

Input Supply Bias Current

VIN = 12V, VOUT = 1.5V, IOUT = 4A

VIN = 20V, VOUT = 1.5V, IOUT = 4A

0.6

0.356

DRVCC

Internal VCC Voltage

6V < VIN < 20V, No Load

5.3

5.6

IDRVCC(REG)

DRVCC Load Regulation

IDRVCC = 0 to 100mA

–1.5

–3

EXTVCC(HYS)

EXTVCC Switchover Hysteresis

200

EXTVCC

EXTVCC Switchover Voltage

EXTVCC Ramping Positive

4.4

4.6

4.8

Output Specifications

IOUT1,2(DC)

Output Continuous Current Range VIN = 12V, VOUT = 1.5V (Note 5)

ΔVOUT1(LINE)

VOUT(NOM)

Line Regulation Accuracy

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

IOUT = 0A For Each Output

0.1

0.2

ΔVOUT2(LOAD)

VOUT2(NOM)

Load Regulation Accuracy

For Each Output, VOUT = 1.5V, 0A to 4A (Note 5)

VIN = 12V

±0.3

±0.5

VOUT1,2(AC)

Output Ripple Voltage

IOUT = 0A, COUT = 100µF X5R Ceramic

VIN = 12V, VOUT = 1.5V

VIN = 20V, VOUT = 1.5V

Output Ripple Voltage Frequency

IOUT = 2A, VIN = 12V, VOUT = 1.5V,

FREQ = 49.9k to Ground

800

kHz

ΔVOUT(START)

Turn-On Overshoot

COUT = 100µF and 47µF X5R Ceramic, VOUT = 1.5V,

IOUT = 0A

VIN = 12V

VIN = 20V

tSTART

Turn-On Time

COUT = 100µF X5R and 47µF Ceramic, VOUT = 1.5V,

IOUT = 0A Resistive Load, TRACK/SS = 10nF

VIN = 12V

ΔVOUT(LS)

Peak Deviation for Dynamic Load

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

COUT = 100µF and 47µF X5R Ceramic, VOUT = 1.5V,

VIN = 12V

tSETTLE

Settling Time for Dynamic Load

Step

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

COUT = 100µF and 47µF X5R Ceramic, VOUT = 1.5V,

VIN = 12V

µs

IOUT(PK)

Output Current Limit

COUT = 100µF and 47µF X5R Ceramic,

VIN = 6V, VOUT = 1.5V

VIN = 20V, VOUT = 1.5V

Control Section

VOUTS1(REG)

Regulated Differential Feedback

VOUTS1-VOUTS–

Sensed at Load Point with Resistive Divider

0.592

0.6

0.608

IVOUTS1

VOUTS1 Input Bias Current

(Note 4)

±5

±25

IVOUTS–

VOUTS– Input Bias Current

(Note 4)

–25

–50

IVFB2

VFB2 Input Bias Current

(Note 4)

–5

±50

VFB2

Voltage at VFB2 Pin

IOUT = 0A, VOUT = 2.5V

0.592

0.6

0.608

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