LTC4269IDKD-2-PBF datasheet(4/34 Pages) LINER

Part #	LTC4269IDKD-2-PBF

Description	IEEE 802.3at High Power PD and Synchronous Forward Controller with AUX Support

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC4269-2

42692fb

elecTrical characTerisTics The

l

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

SD_VSEC(ON) Current

SD_VSEC = SD_VSEC Threshold +100mV

0

µA

SD_VSEC(OFF) Current

SD_VSEC = SD_VSEC Threshold – 100mV

8.3

10

11.7

µA

VIN(ON)

l

14.25

15.75

V

VIN(OFF)

l

8.75

9.25

V

VIN(HYST)

l

3.75

5.5

7.0

V

VREF

Output Voltage

IVREF = 0

l

2.425

2.5

2.575

V

Line Regulation

IVREF = 0, 10V < VIN < 25V

1

10

mV

Load Regulation

0mA < IVREF < 2.5mA

1

10

mV

Oscillator

Frequency, fOSC

ROSC = 178k, FB = 1V, SS_MAXDC = 1.84V

l

165

200

240

kHz

fOSC(MIN)

ROSC = 365k, FB = 1V

80

100

120

kHz

fOSC(MAX)

ROSC = 64.9k, COMP = 2.5V, SD_VSEC = 2.64V

440

500

560

kHz

SYNC Input Resistance

18

kΩ

SYNC Switching Threshold

FB = 1V

1.5

2.2

V

SYNC Frequency/fOSC

FB = 1V (Note 14)

1.25

1.5

fOSC Line Regulation

ROSC = 178k; 10V < VIN < 25V, SS_MAXDC = 1.84V

0.05

0.33

%/V

VROSC

ROSC Pin Voltage

1

V

Error Amplifier

FB Reference Voltage

10V < VIN < 25V, VOL + 0.2V < COMP < VOH – 0.2

l

1.201

1.226

1.250

V

FB Input Bias Current

FB = FB Reference Voltage

-75

-200

nA

Open-Loop Voltage Gain

VOL + 0.2V < COMP < VOH – 0.2

65

85

dB

Unity-Gain Bandwidth

(Note 15)

3

MHz

COMP Source Current

FB = 1V, COMP = 1.6V

–4

–9

mA

COMP Sink Current

COMP = 1.6V

4

10

mA

COMP Current (Disabled)

FB = VREF, COMP = 1.6V

18

23

28

µA

COMP High Level VOH

FB = 1V, ICOMP = –250µA

2.7

3.2

V

COMP Active Threshold

FB = 1V, SOUT Duty Cycle > 0%

0.7

0.8

V

COMP Low Level VOL

ICOMP = 250µA

0.15

0.4

V

Current Sense

ISENSE Maximum Threshold

COMP = 2.5V, FB =1V

197

220

243

mV

ISENSE Input Current (Duty Cycle = 0%)

COMP = 2.5V, FB = 1V (Note 12)

–8

µA

ISENSE Input Current (Duty Cycle = 80%)

COMP = 2.5V, FB = 1V (Note 12)

–35

µA

OC Threshold

COMP = 2.5V, FB = 1V

98

107

116

mV

OC Input Current

(OC = 100mV)

–50

–100

nA

Default Blanking Time

COMP = 2.5V, FB = 1V, RBLANK = 40k (Note 16)

180

ns

Adjustable Blanking Time

COMP = 2.5V, FB = 1V, RBLANK = 120k

540

ns

VBLANK

1

V

SOUT Driver

SOUT Clamp Voltage

IGATE = 0µA, COMP = 2.5V, FB = 1V

10.54

12

13.5

V

SOUT Low Level

IGATE = 25mA

0.5

0.75

V

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