LTM4657 datasheet(3/28 Pages) AD

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LTM4657

Rev. A

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 LTM4657 is tested under pulsed load conditions such that

TJ ≈ TA. The LTM4657E 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

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

IQ(VIN)

Input Supply Bias Current

VIN = 12V, VOUT = 1.5V, MODE = INTVCC

VIN = 12V, VOUT = 1.5V, MODE = GND

Shutdown, RUN = 0, VIN = 12V

µA

IS(VIN)

Input Supply Current

VIN = 12V, VOUT = 1.5V, IOUT = 8A

1.15

IOUT(DC)

Output Continuous Current

Range

VIN = 12V, VOUT = 1.5V

ΔVOUT (Line)/VOUT Line Regulation Accuracy

VOUT = 1.5V, VIN = 3.1V to 20V, IOUT = 0A

0.04

0.15

ΔVOUT (Load)/VOUT Load Regulation Accuracy

VOUT = 1.5V, IOUT = 0A to 8A

0.2

1.2

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

0.495

0.50

0.505

IFB

Current at FB Pin

(Note 4)

±50

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

µA

VIN(UVLO)

VIN Undervoltage Lockout

VIN Falling

VIN Hysteresis

2.5

2.7

250

2.9

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

–11

–8

–5

IPGOOD

PGOOD Leakage

µA

VPGL

PGOOD Voltage Low

IPGOOD = 1mA

0.02

0.1

VINTVCC

Internal VCC Voltage

VIN = 4V to 20V

3.2

3.3

3.4

fOSC

Oscillator Frequency

500

kHz

controls. The LTM4657I 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.

The l denotes the specifications which apply over the specified internal

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

front page.

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