PM6681ATR datasheet(11/47 Pages) STMICROELECTRONICS

11 / 47 page

PM6681A

Electrical characteristics

11/47

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

On time pulse width

Ton

On time duration_

@VIN = 24 V

FSEL to GND

OUT1 = 3.3 V

OUT2 = 1.8 V

575

680

785

195

230

265

FSEL to VREF

OUT1 = 3.3 V

OUT2 = 1.8 V

390

460

530

145

175

205

FSEL to LDO5

OUT1 = 3.3 V

OUT2 =1.8 V

285

340

395

110

135

160

OFF time

TOFFMIN

Minimum off time

@VIN = 24 V

350

500

Voltage reference

VREF

Voltage accuracy

4 V < VLDO5 < 5.5 V

1.224

1.236

1.249

Load regulation

-100

µA< I

REF < 100 µA-4

Undervoltage lockout fault

threshold

Falling edge of REF

0.95

Integrator

Voltage accuracy

+891

+909

Input bias current

(1)

0.1

µA

COMP

Over voltage clamp

Normal mode

250

COMP

Under voltage clamp

-150

Line regulation

Both SMPS, 6 V < Vin < 36 V (1)

LDO5 linear regulator

VLDO5

LDO5 linear output voltage

6 V < VIN < 36 V,

0 < ILDO5 < 50 mA

4.9

5.0

5.1

LDO5 line regulation

6 V < VIN < 36 V, ILDO5 = 20 mA ,

0.004

%/V

ILDO5

LDO5 current limit

VLDO5 > UVLO

270

330

400

ULVO

Under voltage lockout of

LDO5

3.94

4.13

LDO linear regulator

VLDO

LDO linear output voltage

4.5 V< V5SW < 5.5 V

0.5 mA < ILDO < 50 mA

LDO FB connected to LDO

0.887

0.905

0.923

Table 6.

Electrical characteristics

(VIN = 24 V; TJ = 25 °C, unless otherwise specified) (continued)

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