AC-DC and DC-DC Peak-Current-Mode Converters

with Integrated Step-Down Regulator

MAX17497A/MAX17497B

 Maxim Integrated Products 3

ELECTRICAL CHARACTERISTICS (continued)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

FLYBACK/BOOST CONVERTER

Flyback/Boost Switching

Frequency

MAX17497A

235

250

265

kHz

MAX17497B

470

500

530

Flyback/Boost Maximum Duty

Cycle

47.5

48.75

50

%

88

92

96

SSF Pullup Current

9

10

11

F

A

SSF Set Point Voltage

1.18

1.23

1.28

V

SSF Peak Current-Limit Enable

Threshold

1.11

1.17

1.21

V

EAFN Input Bias Current

-100

+100

nA

Error-Amplifier Open-Loop

Voltage Gain

90

dB

Error-Amplifier Transconductance

1.5

1.8

2.1

mS

Error-Amplifier Source Current

80

120

210

F

A

Error-Amplifier Sink Current

80

120

210

F

A

Current-Sense Transresistance

0.45

0.5

0.55

I

IN Clamp Voltage

(Note 3)

31

33.5

36

V

LXF DMOS Switch On-Resistance

175

380

mI

LXF DMOS Peak Current Limit

RLIMF = 100K

1.62

1.9

2.23

A

LXF DMOS Runaway Current

Limit

RLIMF = 100K

1.9

2.3

2.6

A

LXF Leakage Current

0.1

2

F

A

Peak Switch Current Limit with

RLIMF Open

0.35

0.45

0.54

A

Runaway Switch Current Limit

with RLIMF Open

0.39

0.5

0.6

A

RLIMF Reference Current

9

10

11

F

A

Number of Flyback/Boost Peak

Current-Limit Hits Before Hiccup

Timeout

8

#

Number of Flyback/Boost

Runaway Current-Limit Hits

Before Hiccup Timeout

1

#