LTC3785-1(RevA) Просмотр технического описания (PDF) - Linear Technology

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LTC3785-1
(Rev.:RevA)

10V, High Efficiency, Buck-Boost Controller with Power Good

Linear Technology 

LTC3785-1

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

temperature range, otherwise specifications are at TA = 25°C. VIN = ISVOUT = VDRV = VBST1 = VBST2 = 3.6V, RT = 49.9k, RILSET = 59k.

PARAMETER

PGOOD Output Low

PGOOD Leakage

VSENSE Input Current

CONDITIONS

IPGOOD = 500μA

VPGOOD = 5.5V

VSENSE = Measured FB Voltage

MIN TYP MAX UNITS

200

500

mV

5

μA

1

500

nA

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 LTC3785E-1 is guaranteed to meet performance specifications

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

temperature range are assured by design, characterization and correlation

with statistical process controls.

Note 3: Specification is guaranteed by design and not 100% tested in production.

Note 4: Current measurements are performed when the outputs are not switching.

Note 5: The IC is tested in a feedback loop to make the measurement.

TYPICAL PERFORMANCE CHARACTERISTICS

Li-Ion to 3.3V Efficiency

vs Load Current

100

Burst Mode

90 OPERATION

80

70

60

FIXED

FREQUENCY

50

40

30

20

10

0

0.0001

VIN = 4.2V

VIN = 3.6V

VIN = 3V

MOSFET Si7940

L = 4.7μH WURTH WE-PD

fOSC = 500kHz

0.001 0.01 0.1

1

10

LOAD CURRENT (A)

37851 G01

Two Li-Ion to 7V Efficiency

vs Load Current

100

90 Burst Mode

OPERATION

80

70

60

FIXED

FREQUENCY

50

40

30

20

10

0

0.0001

VIN = 8.4V

VIN = 7.2V

VIN = 5.4V

MOSFET Si7940

L = 5.6μH MSS1260

fOSC = 430kHz

0.001 0.01 0.1

1

10

LOAD CURRENT (A)

37851 G02

Li-Ion/9V to 5V VOUT Efficiency

vs Load Current

100

Burst Mode

90 OPERATION

80

70

60

50

40

30

20

10

0

0.0001

FIXED

FREQUENCY

VIN = 9V

VIN = 4.2V

VIN = 3.6V

VIN = 2.7V

MOSFET Si7940

L = 5.6μH MSS1260

fOSC = 430kHz

0.001 0.01 0.1

LOAD CURRENT (A)

1

10

37851 G03

Burst Mode Ripple

VOUT

50mV/DIV

AC

COUPLED

INDUCTOR

CURRENT

1A/DIV

VOUT = 3.3V

COUT = 100μF

5μs/DIV

Line Transient Response

VOUT

500mV/DIV

VOUT Load Transient

VOUT

200mV/

DIV

VIN

3V TO 8.5V

37851 G04

ILOAD = 300μA 500μs/DIV

VOUT = 5V

37851 G05

ILOAD

10mA TO 2A

VIN = 3.6V

VOUT = 3.3V

C 100μF

100μs/DIV

37851 G06

37851fa

4

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