LTM4620A datasheet(4/34 Pages) LINER

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LTM4645

4645f

For more information www.linear.com/LTM4645

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.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

PGOOD

RPGOOD

PGOOD Pull-Down Resistance

200

VPGOOD

PGOOD Trip Level

VFB With Respect to Set Output

VFB Ramping Negative

VFB Ramping Positive

–7.5

7.5

VPGL

PGOOD Voltage Low

IPGOOD = 2mA

0.1

0.3

INTVCC Linear Regulator

VINTVCC

Internal VCC Voltage

VIN ≥ 12V

5.3

5.5

5.7

VINTVCC Load Reg INTVCC Load Regulation

ICC = 0mA to 10mA

0.5

Oscillator and Phase-Locked Loop

fSYNC

SYNC Capture Range

300

1000

kHz

fSW

Switching Frequency

RFREQ = 47.5kΩ

540

600

660

kHz

IFREQ

FREQ Pin Current

VFREQ = 0.8V

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

1.2

θCLKOUT

CLKOUT to SW Phase Delay

VPHSMD = 0V

VPHSMD = 1/4 INTVCC

VPHSMD = Float

VPHSMD = 3/4 INTVCC

VPHSMD = INTVCC

120

180

Deg

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 LTM4645 is tested under pulsed load conditions such that

TJ ≈ TA. The LTM4645E 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 LTM4645I 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: 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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