3728L1 データシートの表示（PDF） - Linear Technology

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3728L1

Dual, 550kHz, 2-Phase Synchronous Regulator

Linear Technology 

LTC3728L-1

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

IPLLFLTR

Phase Detector Output Current

Sinking Capability

fPLLIN < fOSC

–15

Sourcing Capability

fPLLIN > fOSC

15

3.3V Linear Regulator

V3.3OUT

V3.3IL

V3.3VL

I3.3LEAK

PGOOD Output

3.3V Regulator Output Voltage

3.3V Regulator Load Regulation

3.3V Regulator Line Regulation

Leakage Current in Shutdown

No Load

I3.3 = 0 to 10mA

6V < VIN < 30V

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

● 3.2 3.35 3.45

0.5

2

0.05 0.2

●

10 50

VPGL

IPGOOD

VPG

PGOOD Voltage Low

PGOOD Leakage Current

PGOOD Trip Level, Either Controller

IPGOOD = 2mA

VPGOOD = 5V

VOSENSE with Respect to Set Output Voltage

VOSENSE Ramping Negative

VOSENSE Ramping Positive

0.1 0.3

±1

– 6 –7.5 – 9.5

6 7.5 9.5

UNITS

μA

μA

V

%

%

μA

V

μA

%

%

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

TYPICAL PERFORMANCCE CHARACTERISTICS

Efficiency vs Output Current

and Mode (Figure 13)

100

Burst Mode

90 OPERATION

80

70

FORCED

60

CONTINUOUS

50

MODE (PWM)

40

30

20

10

0

0.001

CONSTANT

FREQUENCY

(BURST DISABLE)

VIN = 15V

VOUT = 5V

f = 250kHz

0.01

0.1

1

10

OUTPUT CURRENT (A)

3728L1 G01

4

Efficiency vs Output Current

(Figure 13)

100

VIN = 7V

90

VIN = 10V

80

VIN = 15V

VIN = 20V

70

60

50

0.001

VOUT = 5V

f = 250kHz

0.01

0.1

1

OUTPUT CURRENT (A)

10

3728L1 G02

Efficiency vs Input Voltage

(Figure 13)

100

90

80

70

60

VOUT = 5V

IOUT = 3A

f = 250kHz

50

5

15

25

35

INPUT VOLTAGE (V)

3728L1 G03

3728l1fc

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