LTM4627_15 datasheet(4/32 Pages) LINER

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LTM4627

4627fc

For more information www.linear.com/LTM4627

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VOS

Input Offset Voltage

VOSNS+ = VDIFF_OUT = 1.5V, IDIFF_OUT = 100µA

Differential Gain

(Note 7)

V/V

Slew Rate

(Note 6)

V/µs

GBP

Gain Bandwidth Product

(Note 6)

MHz

CMRR

Common Mode Rejection

(Note 7)

IDIFF_OUT

DIFF_OUT Current

Sourcing

PSRR

Power Supply Rejection

Ratio

5V < VIN < 20V (Note 7)

100

RIN

Input Resistance

VOSNS+ to GND

kΩ

VPGOOD

PGOOD Trip Level

VFB With Respect to Set Output

VFB Ramping Negative

VFB Ramping Positive

–10

VPGL

PGOOD Voltage Low

IPGOOD = 2mA

0.1

0.3

INTVCC Linear Regulator

VINTVCC

Internal VCC Voltage

6V < VIN < 20V

4.8

5.2

VINTVCC Load Reg INTVCC Load Regulation

ICC = 0 to 50mA

0.5

VEXTVCC

External VCC Switchover

EXTVCC Ramping Positive

4.5

4.7

VLDO Ext

EXTVCC Voltage Drop

ICC = 25mA, VEXTVCC = 5V

100

Oscillator and Phase-Locked Loop

fSYNC

Frequency Sync Capture

Range

MODE_PLLIN Clock Duty Cycle = 50%

250

800

kHz

fNOM

Nominal Frequency

VfSET = 1.2V

450

500

550

kHz

fLOW

Lowest Frequency

VfSET = 1V

350

400

450

kHz

fHIGH

Highest Frequency

VfSET ≥ 2.4V

700

770

850

kHz

IFREQ

Frequency Set Current

µA

RMODE_PLLIN

MODE_PLLIN Input

Resistance

250

kΩ

VIH_MODE_PLLIN

Clock Input Level High

2.0

VIL_MODE_PLLIN

Clock Input Level Low

0.8

ELECTRICAL CHARACTERISTICS The

denotes the specifications which apply over the specified internal

operating temperature range, otherwise specifications are at TA = 25°C (Note 2), VIN = 12V, per the typical application in Figure 18.

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 LTM4627 is tested under pulsed load conditions such that

TJ ≈ TA. The LTM4627E 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 LTM4627I is guaranteed to meet specifications over the

–40°C to 125°C internal operating temperature range. The LTM4627MP

is guaranteed and tested over the –55°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: The minimum on-time condition is specified for a peak-to-peak

inductor ripple current of ~40% of IMAX Load. (See the Applications

Information section)

Note 4: See output current derating curves for different VIN, VOUT and TA.

Note 5: Limit current into the RUN pin to less than 2mA.

Note 6: Guaranteed by design.

Note 7: 100% tested at wafer level.

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