PM6686 datasheet(12/50 Pages) STMICROELECTRONICS

12 / 50 page

Electrical characteristics

PM6686

12/50

Doc ID 15281 Rev 4

Electrical characteristics

VIN = 12 V, no load on LDO, OUT1, OUT2, VREF3, and VREF2. EN2 = EN1 = VCC,

LDO_SW = 5 V, PVCC = 5 V, EN_LDO = 5 V, TJ = 25 °C unless otherwise specified)

Table 6.

Electrical characteristics

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

Switching controller output accuracy

OUT2

Output voltage

VIN = 5.5 V to 28 V, REFIN2 = VCC,

SKIP = VCC

3.25

3.330 3.397

VIN = 5.5 V to 28 V,

REFIN2 = VREF3, SKIP = VCC

1.038

1.05

1.062

OUT1

Output voltage

VIN = 5.5 V to 28 V, FB1 = VCC,

SKIP = VCC

1.482 1.500 1.518

VIN = 5.5 V to 28 V, FB1 = GND,

SKIP = VCC

4.975 5.050 5.125

FB1

Feedback accuracy with

OUT1 in adjustable mode

VIN = 5.5 V to 28 V, SKIP = VCC

0.693 0.700 0.707

REFIN2

Accuracy referred to REFIN2

REFIN2 = 0.7 V to 2.5 V,

SKIP = VCC

-1

Current limit and zero crossing comparator

ILIM

ILIM bias current

TA = +25 °C.

4.5

5.5

µA

Positive current limit threshold

Adjustable, VILIM = 0.5 V, GND-PHASE

Adjustable, VILIM = 1 V or VCC, GND-

PHASE

100

115

Adjustable, VILIM = 2 V, GND-PHASE

180

200

220

Zero crossing current

threshold

SKIP = GND, VREF2, or OPEN, GND-

PHASE

-1

+11

Switching frequency

On-time pulse width

OUT1 = 5.125 V

TON = GND or

VREF2

0.908 1.068 1.228

µs

TON = VCC

1.815 2.135 2.455

OUT2 = 3.368 V

TON = GND

0.477 0.561 0.655

TON = VCC or

VREF2

0.796 0.936 1.076

Minimum Off-time

350

472

No-audible skip mode

operating frequency

SKIP = VREF2(or OPEN)

kHz

Soft-start and soft-end

Soft-start ramp time

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