LTM4644 datasheet(4/32 Pages) LINER

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LTM4634

4634f

For more information www.linear.com/LTM4634

elecTrical characTerisTics The

denotes the specifications which apply over the specified internal

operating temperature range (Note 2), otherwise specifications are at TA = 25°C. VIN = 24V, per the typical application for each regulator

channel.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VPGOOD

PGOOD Trip Level

PGOOD12

PGOOD3

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

Float

MODE/PLLIN

6V < VIN < 28V, ICC = 0mA

4.8

5.2

VLDOINT

INTVCC Load Regulation

ICC = 0mA to 100mA

VEXTVCC

EXTVCC Switchover Voltage

EXTVCC Ramping Positive

4.5

4.7

VLDOEXT

EXTVCC Voltage Drop

ICC = 20mA, VEXTVCC = 5V

VLDOHYS

EXTVCC Hysteresis

200

Oscillator and Phase-Locked Loop

fSYNC

SYNC Capture Range

Clock Input Duty Cycle = 50%

250

750

kHz

Switching Frequency

VFREQ/PLLLPF = INTVCC

700

750

825

kHz

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

Clock Phase

VOUT2 to VOUT1 Phase

VOUT3 to VOUT2 Phase

VOUT1 to VOUT3 Phase

VFREQ/PLLLPF = 1.2V (Note 3)

120

Deg

VTEMP1,2

Temperature Diode Forward Voltage

ITEMP = 100µA

0.598

TC VTEMP

Temperature Coefficient

–2.0

mV/°C

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 LTM4634 is tested under pulsed load conditions such that

TJ ≈ TA. The LTM4634E 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 LTM4634I is guaranteed to meet specifications over the

–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: 100% tested at wafer level.

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

Note 5: High duty designs need to be validated based on maximum

temperature rise and derating in ambient conditions.

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