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LTC3728L-1

3728l1fc

ELECTRICAL CHARACTERISTICS The l denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at TA = 25°C. VIN = 15V, VRUN/SS1, 2 = 5V unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

IPLLFLTR

Phase Detector Output Current

Sinking Capability

Sourcing Capability

fPLLIN < fOSC

fPLLIN > fOSC

–15

μA

3.3V Linear Regulator

V3.3OUT

3.3V Regulator Output Voltage

No Load

●

3.2

3.35

3.45

V3.3IL

3.3V Regulator Load Regulation

I3.3 = 0 to 10mA

0.5

V3.3VL

3.3V Regulator Line Regulation

6V < VIN < 30V

0.05

0.2

I3.3LEAK

Leakage Current in Shutdown

VRUN/SS1 = 0V; VRUN/SS2 = 0V, VIN = 3V

●

μA

PGOOD Output

VPGL

PGOOD Voltage Low

IPGOOD = 2mA

0.1

0.3

IPGOOD

PGOOD Leakage Current

VPGOOD = 5V

±1

μA

VPG

PGOOD Trip Level, Either Controller

VOSENSE with Respect to Set Output Voltage

VOSENSE Ramping Negative

VOSENSE Ramping Positive

–6

–7.5

7.5

– 9.5

9.5

Efﬁciency vs Output Current

and Mode (Figure 13)

Efﬁciency vs Output Current

(Figure 13)

Efﬁciency vs Input Voltage

(Figure 13)

TYPICAL PERFORMANCCE CHARACTERISTICS

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: TJ is calculated from the ambient temperature TA and power

dissipation PD according to the following formulas:

LTC3728LUH-1: TJ = TA + (PD • 34°C/W)

LTC3728LGN-1: TJ = TA + (PD • 95°C/W)

Note 3: The IC is tested in a feedback loop that servos VITH1, 2 to a

speciﬁed voltage and measures the resultant VOSENSE1, 2.

Note 4: Dynamic supply current is higher due to the gate charge being

delivered at the switching frequency. See Applications Information.

Note 5: Rise and fall times are measured using 10% and 90% levels. Delay

times are measured using 50% levels.

Note 6: The minimum on-time condition is speciﬁed for an inductor

peak-to-peak ripple current ≥ 40% of IMAX (see minimum on-time

considerations in the Applications Information section).

Note 7: The LTC3728LE-1 are 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 LTC3728LI-1 is

guaranteed to meet performance speciﬁcations over the full –40°C to 85°C

operating temperature range

OUTPUT CURRENT (A)

0.001

100

0.01

0.1

3728L1 G01

FORCED

CONTINUOUS

MODE (PWM)

CONSTANT

FREQUENCY

(BURST DISABLE)

Burst Mode

OPERATION

VIN = 15V

VOUT = 5V

f = 250kHz

OUTPUT CURRENT (A)

0.001

3728L1 G02

0.01

0.1

100

VIN = 10V

VIN = 15V

VIN = 7V

VIN = 20V

VOUT = 5V

f = 250kHz

INPUT VOLTAGE (V)

3728L1 G03

100

VOUT = 5V

IOUT = 3A

f = 250kHz

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