LTC3355-1

3

Rev. 0

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l

denotes the specifications which apply over the specified operating

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

l

3

20

V

Load, In Regulation, Supercapacitor Charged

l

l

60

110

120

265

215

420

µA

µA

FB Reference Voltage

l

0.775

0.825

V

FB Line Regulation

0.1

%/V

FB Input Bias Current

–20

20

nA

l

2.7

5

V

Buck or Boost Enabled

5.4

5.65

5.95

V

Boost Enabled

1.8

2

2.2

V

4.65

V

2

5

V

0

5

V

EN_CHG = High

–10

10

%

EN_CHG = High

0.1

1

A

EN_CHG = High

0.78

0.82

V

60.4

604

kΩ

CFB Input Bias Current

–20

20

nA

CFB Reference Voltage

EN_CHG = High

0.78

0.8

0.82

V

CFB Hysteresis

EN_CHG = High

30

mV

CFB Overvoltage Hysteretic Comparator

Switch Point

CFB Rising

CFB Falling

V

V

37

42

43

50

mV

mV

3.0

20

V

Switching Frequency

FB ≥ 0.5V

0.75

1

1.25

MHz

Foldback Frequency (Buck Only)

FB ≤ 0.3V

100

kHz

PFI Falling Threshold

l

0.775

0.8

0.825

V

PFI Hysteresis

17

mV

PFI Leakage Current

–20

20

nA

1A Buck Regulator

SW1 Peak Current

(Note 5)

1.3

1.65

2

A

Soft-Start Time

1000

µs

DC Max

Maximum Duty Cycle

FB = 0V

100

%

PMOS On-Resistance

0.5

1

Ω

PMOS Leakage Current

Buck Disabled

–2

2

µA