LTM4657 datasheet(3/24 Pages) AD

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LTM4705

Rev. 0

For more information www.analog.com

ELECTRICAL CHARACTERISTICS

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 LTM4705 is tested under pulsed load conditions such that TJ ≈

TA. The LTM4705E 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 LTM4705I is guaranteed to meet specifications over the full –40°C

to 125°C 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: See output current derating curves for different VIN, VOUT and TA.

Note 4: 100% tested at wafer level.

Note 5: This IC includes overtemperature protection that is intended

to protect the device during momentary overload conditions. Junction

temperature will exceed 125°C when overtemperature protection is active.

Continuous operation above the specified maximum operating junction

temperature may impair device reliability.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

IS(VIN)

Input Supply Current

VIN1 = VIN2 = 12V, VOUT = 1.5V, IOUT = 5A

0.74

IOUT(DC)

Output Continuous Current Range

VIN1 = VIN2 = 12V, VOUT = 1.5V (Note 3)

ΔVOUT(Line)/

VOUT

Line Regulation Accuracy

VOUT = 1.5V, VIN1 = VIN2 = 3.1V to 20V, IOUT = 0A

0.01

0.1

%/V

ΔVOUT(Load)/

VOUT

Load Regulation Accuracy

VOUT = 1.5V, IOUT = 0A to 5A

0.2

0.8

VOUT(AC)

Output Ripple Voltage

IOUT = 0A, COUT = 100µF Ceramic, VIN1 = VIN2 = 12V, VOUT

= 1.5V

ΔVOUT(START) Turn-On Overshoot

IOUT = 0A, COUT = 100µF Ceramic, VIN1 = VIN2 = 12V, VOUT

= 1.5V

tSTART

Turn-On Time

COUT = 100µF Ceramic, No Load, TRACK/SS = 0.01µF, VIN

= 12V, VOUT = 1.5V

ΔVOUTLS

Peak Deviation for Dynamic Load

Load: 0% to 25% to 0% of Full Load, COUT = 100µF

Ceramic, VIN = 12V, VOUT = 1.5V

tSETTLE

Settling Time for Dynamic Load Step Load: 0% to 25% to 0% of Full Load, COUT = 100µF

Ceramic, VIN = 12V, VOUT = 1.5V

µs

IOUTPK

Output Current Limit

VIN = 12V, VOUT = 1.5V

VFB

Voltage at VFB Pin

IOUT = 0A, VOUT = 1.5V

0.592

0.6

0.608

IFB

Current at VFB Pin

(Note 4)

±30

RFBHI

Resistor Between VOUT and VFB Pins

60.4

60.8

kΩ

UVLO

VIN Undervoltage Lockout

VIN Falling

Hysteresis

2.2

2.4

0.5

2.6

ITRACK/SS

Track Pin Soft-Start Pull-Up Current

TRACK/SS = 0V

1.4

µA

tss

Internal Soft-Start Time

10% to 90% Rise Time (Note 4)

1000

µs

tON(MIN)

Minimum On-Time

(Note 4)

tOFF(MIN)

Minimum Off-Time

(Note 4)

100

VPGOOD

PGOOD Trip Level

VFB with Respect to Set Output

VFB Ramping Negative

VFB Ramping Positive

–10

–8

–5

RPGOOD

PGOOD Pull-Down Resistance

10mA Load

VINTVCC

Internal VCC Voltage

VIN1 = VIN2 = 3.6V to 20V

3.1

3.3

3.5

VINTVCC

Load Reg

INTVCC Load Regulation

ICC = 0mA to 50mA

1.3

FREQ

Default Switching Frequency

MHz

VSYNC/MODE SYNC/MODE High Threshold

SYNC/MODE Low Threshold

MODE VIH

MODE VIL

0.3

IMODE

SYNC/MODE Input Current

MODE = 0V

MODE = INTVCC

1.5

–1.5

µA

The l denotes the specifications which apply over the full operating

temperature range (Note 2), otherwise specifications are at TA = 25°C (Note 2), VIN1 = VIN2 = 12V, unless otherwise noted per the

typical application shown in Figure 23.

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