LTC3532

3

3532fc

ELECTRICAL CHARACTERISTICS

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

PMOS Switch Leakage

Switches A and D

0.1

10

μA

NMOS Switch On Resistance

Switches B and C

0.36

Ω

PMOS Switch On Resistance

Switches A and D

0.42

Ω

Input Current Limit

0.8

1.1

1.45

A

Maximum Duty Cycle

Boost (% Switch C On)

Buck (% Switch A On)

●

●

70

100

88

%

%

Minimum Duty Cycle

●

0%

Frequency Accuracy

●

575

740

885

kHz

Burst Threshold (Falling)

0.88

V

Burst Threshold (Rising)

1.12

V

Burst Current Ratio

8000

Error Amp AVOL

90

dB

Error Amp Source Current

15

μA

Error Amp Sink Current

310

μA

SHDN/SS Threshold

When IC is Enabled

When EA is at Maximum Boost Duty Cycle

●

0.4

1

2.2

1.5

V

V

SHDN/SS Input Current

0.01

1

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: The LTC3532E 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 correlations

with statistical process controls.

Note 3: Current measurements are performed when the outputs are not

switching.

Note 4: This IC includes overtemperature protection that is intended

to protect the device during momentary overload conditions. Junction

temperature will exceed 125°C when overtemperature protection is active.

Continuous operation above the specified maximum operating junction

temperature may result in device degradation or failure.

Efficiency and Power Loss

vs Load Autoburst Mode

Efficiency and Power Loss

vs Load

Fixed Frequency and Burst Mode

LOAD CURRENT (mA)

60

80

100

50

70

90

0.1

10

100

1000

3532 G01

40

1

10

1000

0.1

100

0.01

1

POWER LOSS

EFFICIENCY

3V

3.6V

4.2V

LOAD CURRENT (mA)

60

80

100

50

70

90

0.1

10

100

1000

3532 G02

40

1

1000

100

10

1

0.1

BURST EFFICIENCY

FIXED FREQUENCY

EFFICIENCY

FIXED FREQUENCY

POWER LOSS

BURST

POWER LOSS

2.5

0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.5

5.5

3532 G03

75

80

70

65

55

50

45

60

40

BURST MODE

2000kHz

1000kHz

500kHz

1500kHz

NOT SWITCHING