LTM4624 datasheet(3/26 Pages) LINER

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LTM4624

4624fd

For more information www.linear.com/LTM4624

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 LTM4624 is tested under pulsed load conditions such that

TJ ≈ TA. The LTM4624E is guaranteed to meet performance specifications

over the 0°C to 125°C internal operating temperature range. Specifications

over the –40°C to 125°C internal operating temperature range are assured

by design, characterization and correlation with statistical process

controls. The LTM4624I 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.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

ΔVOUT (Line)/VOUT Line Regulation Accuracy

VOUT = 1.5V, VIN = 4V to 14V, IOUT = 0A

0.04

0.15

%/V

ΔVOUT (Load)/VOUT Load Regulation Accuracy

VOUT = 1.5V, IOUT = 0A to 4A

1.5

VOUT(AC)

Output Ripple Voltage

IOUT = 0A, COUT = 100µF Ceramic, VIN = 12V,

VOUT = 1.5V

ΔVOUT(START)

Turn-On Overshoot

IOUT = 0A, COUT = 100µF Ceramic, VIN = 12V,

VOUT = 1.5V

tSTART

Turn-On Time

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

= 12V, VOUT = 1.5V

2.5

ΔVOUTLS

Peak Deviation for Dynamic

Load

Load: 0% to 50% to 0% of Full Load, COUT = 47µF

Ceramic, VIN = 12V, VOUT = 1.5V

160

tSETTLE

Settling Time for Dynamic

Load Step

Load: 0% to 50% to 0% of Full Load, COUT = 47µF

Ceramic, VIN = 12V, VOUT = 1.5V

µs

IOUTPK

Output Current Limit

VIN = 12V, VOUT = 1.5V

VFB

Voltage at FB Pin

IOUT = 0A, VOUT = 1.5V

IOUT = 0A, VOUT = 1.5V, –40°C to 125°C

0.594

0.591

0.60

0.606

0.609

IFB

Current at FB Pin

(Note 4)

±30

RFBHI

Resistor Between VOUT and

FB Pins

60.05

60.40

60.75

kΩ

ITRACK/SS

Track Pin Soft-Start Pull-Up

Current

TRACK/SS = 0V

2.5

µA

VIN(UVLO)

VIN Undervoltage Lockout

VIN Falling

VIN Hysteresis

2.4

2.6

350

2.8

tON(MIN)

Minimum On-Time

(Note 4)

tOFF(MIN)

Minimum Off-Time

(Note 4)

VPGOOD

PGOOD Trip Level

VFB With Respect to Set Output

VFB Ramping Negative

VFB Ramping Positive

–13

–10

–7

IPGOOD

PGOOD Leakage

µA

VPGL

PGOOD Voltage Low

IPGOOD = 1mA

0.02

0.1

VINTVCC

Internal VCC Voltage

SVIN = 4V to 14V

3.2

3.3

3.4

VINTVCC Load Reg INTVCC Load Regulation

ICC = 0mA to 20mA

0.5

fOSC

Oscillator Frequency

MHz

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.

The l denotes the specifications which apply over the full internal

operating temperature range (Note 2), otherwise specifications are at TA = 25°C. VIN = SVIN = 12V per the typical application shown on

the front page.

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