LTM4609

4

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 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

Feedback Reference Voltage

l

0.792

0.8

0.808

V

RUN Pin ON/OFF Threshold

1

1.6

2.2

V

Soft-Start Charging Current

1

1.7

μA

Start-Up Threshold

0.4

0.7

V

Keep-Active Power On Threshold

1.25

V

Forced Continuous Threshold

0.76

0.8

0.84

V

Forced Continuous Pin Current

–0.3

–0.2

–0.1

μA

Burst Inhibit (Constant Frequency)

Threshold

Measured at FCB Pin

5.3

5.5

V

Maximum Duty Factor

% Switch M4 On

99

%

Maximum Duty Factor

% Switch M1 On

99

%

Minimum On-Time for Synchronous

Switch in Buck Operation

Switch M1 (Note 6)

200

250

ns

RFBHI

99.5

100

100.5

kΩ

l

5.7

6

6.3

V

0.3

2

%

l

5.4

5.6

V

300

mV

60

150

mV

Current Sensing Section

Maximum Current Sense Threshold

Boost Mode

Buck Mode

l

l

–95

160

–130

190

–150

mV

mV

Minimum Current Sense Threshold

Discontinuous Mode

–6

mV

Sense Pins Total Source Current

–380

μA

PGOOD

PGOOD Upper Threshold

5.5

7.5

10

%

PGOOD Lower Threshold

–5.5

–7.5

–10

%

PGOOD Hysteresis

2.5

%

PGOOD Low Voltage

0.2

0.3

V

PGOOD Leakage Current

1

μA