LTC1698 datasheet(2/24 Pages) LINER

Part #	LTC1698

Description	Isolated Secondary Synchronous Rectifier Controller

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Manufacturer	LINER [Linear Technology]

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LTC1698

1698f

(Note 1)

VDD, PWRGD ....................................................... 13.2V

Input Voltage

MARGIN, VFB, OVPIN, ISNSGND, ISNS ... –0.3V to 5.3V

SYNC ..................................................... – 14V to 14V

Output Voltage

VCOMP, ICOMP (Note 2)......................... –0.3V to 5.3V

Power Dissipation .............................................. 500mW

Operating Temperature Range

LTC1698E (Note 3) ............................ – 40

°C to 85°C

LTC1698I ........................................... – 40

°C to 85°C

Storage Temperature Range ................. – 65

°C to 150°C

Lead Temperature (Soldering, 10 sec).................. 300

°C

ABSOLUTE MAXIMUM RATINGS

PACKAGE/ORDER INFORMATION

ORDER PART

NUMBER

LTC1698EGN

LTC1698ES

LTC1698IGN

LTC1698IS

TJMAX = 125°C, θJA = 130°C/W (GN)

TJMAX = 125°C, θJA = 110°C/W (SO)

GN PACKAGE

16-LEAD PLASTIC SSOP

S PACKAGE

16-LEAD PLASTIC SO

1

2

3

4

5

6

7

8

TOP VIEW

16

15

14

13

12

11

10

9

VDD

CG

PGND

GND

OPTODRV

VCOMP

MARGIN

VFB

FG

SYNC

VAUX

ICOMP

ISNS

ISNSGND

PWRGD

OVPIN

The q indicates specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VDD = 8V, unless otherwise noted. (Note 4)

ELECTRICAL CHARACTERISTICS

Consult LTC Marketing for parts specified with wider operating temperature ranges.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VDD

Supply Voltage

q

6

8

12.6

V

VUVLO

Undervoltage Lockout

4V

IVDD

VDD Supply Current

VFB, OVPIN, VISNS, VISNSGND = 0V,

CFG = CCG = 1000pF, CVAUX = 0.1µF,

VSYNC = 0V

q

1.8

4

mA

fSYNC = 100kHz (Note 5)

5.0

mA

MARGIN and Error Amplifier

VFB

Feedback Voltage

MARGIN = Open, VCOMP = 1V (Note 7)

1.223

1.233

1.243

V

q

1.215

1.233

1.251

V

IVFB

Feedback Input Current

VFB = 1.233V

q

0.05

1

µA

VMARGIN

MARGIN Voltage

MARGIN = Open

1.65

V

RMARGIN

MARGIN Input Resistance

16.5

k

Ω

∆VFB

Feedback Voltage Adjustment

VMARGIN = 3.3V

q

456

%

VMARGIN = 0V

q

–6

–5

–4

%

GERR

Error Amplifier Open-Loop DC Gain

VCOMP = 0.8V to 1.2V, Load = 2kΩ, 100pF

q

65

90

dB

BWERR

Error Amplifier Unity-Gain Bandwidth

No Load (Note 6)

2

MHz

VCLAMP

Error Amplifier Output Clamp Voltage

VFB = 0V

2

V

IVCOMP

Error Amplifier Source Current

VFB = 0V

q

–25

– 10

mA

Error Amplifier Sink Current

VFB = 5V, VCOMP = 1.233V

q

37

mA

OPTODRV

GOPTO

Opto Driver DC Gain

OVPIN, VISNS, VISNSGND = 0V

q

4.75

5

5.25

V/V

BWOPTO

Opto Driver Unity-Gain Bandwidth

No Load (Note 6)

1

MHz

VOPTOHIGH

Opto Driver Output High Voltage

VFB, OVPIN, VISNSGND = 0V, VISNS = – 50mV,

IOPTODRV = –10mA

q

45

V

IOPTOSC

Opto Driver Output Short-Circuit Current

OVPIN, VISNSGND, VISNS = 0V, VFB = 1.233V

q

–50

– 25

–10

mA

GN PART MARKING

1698

1698I

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