LTC4271 datasheet(7/30 Pages) LINER

7 / 30 page

LTC4274A/LTC4274C

4274acfc

TYPICAL PERFORMANCE CHARACTERISTICS

Power-On Sequence in

AUTO Pin Mode

Powering Up into a 180μF Load

802.3af Classification in

AUTO Pin Mode

2-Event Classification in

AUTO Pin Mode

Classification Transient Response

to 40mA Load Step

Classification Current Compliance

VDD Supply Current vs Voltage

VEE Supply Current vs Voltage

802.3at ILIM Threshold

vs Temperature

100ms/DIV

–70

–60

–10

–20

–30

–40

–50

4274AC G01

VDD = 3.3V

VEE = –54V

FORCED CURRENT DETECTION

FORCED VOLTAGE

DETECTION

802.3af

CLASSIFICATION

POWER ON

GND

VEE

5ms/DIV

GND

0mA

4274AC G02

VEE

GATE

VOLTAGE

10V/DIV

PORT

CURRENT

200 mA/DIV

PORT

VOLTAGE

20V/DIV

FOLDBACK

FET ON

425mA

CURRENT LIMIT

LOAD

FULLY

CHARGED

VDD = 3.3V

VEE = –54V

5ms/DIV

VEE

–18.4

PORT

VOLTAGE

10V/DIV

GND

4274AC G03

VDD = 3.3V

VEE = –55V

PD IS CLASS 1

10ms/DIV

VEE

–17.6

PORT

VOLTAGE

10V/DIV

GND

4274AC G04

VDD = 3.3V

VEE = –55V

PD IS CLASS 4

1ST CLASS EVENT

2ND CLASS EVENT

50μs/DIV

40mA

0mA

4274AC G05

–20V

PORT

VOLTAGE

1V/DIV

PORT

CURRENT

20mA/DIV

VDD = 3.3V

VEE = –54V

CLASSIFICATION CURRENT (mA)

–20

–18

–16

–14

–12

–10

–8

–6

–4

–2

010

4274AC G06

VDD = 3.3V

VEE = –54V

TA = 25°C

VDD SUPPLY VOLTAGE (V)

2.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

1.5

1.6

1.7

1.8

2.9

3.1

3.3

3.5

4274AC G07

3.7

3.9

4.1

4.3

85°C

25°C

–40°C

VEE SUPPLY VOLTAGE (V)

–60

2.0

2.1

2.2

2.3

2.4

–55 –50 –45 –40

4274AC G08

–35 –30 –25 –20

85°C

25°C

–40°C

TEMPERATURE (°C)

–40

210

211

213

212

214

215

840

844

852

848

856

860

040

4274AC G09

–80

120

VDD = 3.3V

VEE = –54V

RSENSE = 0.25Ω

REG 48h = C0h

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