LTM4609EVPBF datasheet(4/24 Pages) LINER

4 / 24 page

LTM4609

4609fa

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 LTM4609E is guaranteed to meet performance speciﬁcations

from 0°C to 85°C. Speciﬁcations over the –40°C to 85°C operating

temperature range are assured by design, characterization and correlation

with statistical process controls. The LTM4609I is guaranteed over the full

–40°C to 85°C temperature range.

Note 3: See Application Note 100.

Note 4: The LTM4609 is tested in a feedback loop that servos VCOMP to a

speciﬁed voltage and measures the resultant VFB.

Note 5: Turn-on and turn-off time are measured using 10% and 90%

levels. Transition delay time is measured using 50% levels.

Note 6: 100% test at wafer level only.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Control Section

VFB

Feedback Reference Voltage

VCOMP = 1.2V

0.792

0.8

0.808

VRUN

RUN Pin ON/OFF Threshold

1.6

2.2

ISS

Soft-Start Charging Current

VRUN = 2.2V

1.7

μA

VSTBYMD(START)

Start-Up Threshold

VSTBYMD Rising

0.4

0.7

VSTBYMD(KA)

Keep-Active Power On Threshold

VSTBYMD Rising, VRUN = 0V

1.25

VFCB

Forced Continuous Threshold

0.76

0.8

0.84

IFCB

Forced Continuous Pin Current

VFCB = 0.85V

–0.3

–0.2

–0.1

μA

VBURST

Burst Inhibit (Constant Frequency)

Threshold

Measured at FCB Pin

5.3

5.5

DF(BOOST, MAX)

Maximum Duty Factor

% Switch M4 On

DF(BUCK, MAX)

Maximum Duty Factor

% Switch M1 On

tON(MIN, BUCK)

Minimum On-Time for Synchronous

Switch in Buck Operation

Switch M1 (Note 6)

200

250

RFBHI

Resistor Between VOUT and VFB Pins

99.5

100

100.5

kΩ

Internal VCC Regulator

INTVCC

Internal VCC Voltage

VIN > 7V, VEXTVCC = 5V

5.7

6.3

ΔVLDO/VLDO

Internal VCC Load Regulation

ICC = 0mA to 20mA, VEXTVCC = 5V

0.3

VEXTVCC

EXTVCC Switchover Voltage

ICC = 20mA, VEXTVCC Rising

5.4

5.6

ΔVEXTVCC(HYS)

EXTVCC Switchover Hysteresis

300

ΔVEXTVCC

EXTVCC Switch Drop Voltage

ICC = 20mA, VEXTVCC = 6V

150

Current Sensing Section

VSENSE(MAX)

Maximum Current Sense Threshold

Boost Mode

Buck Mode

–95

160

–130

190

–150

VSENSE(MIN, BUCK)

Minimum Current Sense Threshold

Discontinuous Mode

–6

ISENSE

Sense Pins Total Source Current

VSENSE– = VSENSE+ = 0V

–380

μA

PGOOD

ΔVFBH

PGOOD Upper Threshold

VFB Rising

5.5

7.5

ΔVFBL

PGOOD Lower Threshold

VFB Falling

–5.5

–7.5

–10

ΔVFB(HYS)

PGOOD Hysteresis

VFB Returning

2.5

VPGL

PGOOD Low Voltage

IPGOOD = 2mA

0.2

0.3

IPGOOD

PGOOD Leakage Current

VPGOOD = 5V

μA

ELECTRICAL CHARACTERISTICS The l denotes the speciﬁcations which apply over the –40°C to 85°C

temperature range, otherwise speciﬁcations are at TA = 25°C, VIN = 12V. Per typical application (front page) conﬁguration.

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