L5994A datasheet(4/26 Pages) STMICROELECTRONICS

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L5994 - L5994A

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Over voltage threshold ON

V1SNS

2.09

2.15

2.21

Under voltage threshold ON

V1SNS

1.66

1.71

1.76

SECTION 2 PWM CONTROLLER

V2out

V2SNS feedback voltage

Vin = 5V to 20V

NOSKIP = REG5

Vi2sns-Vv2sns = 0 to 40mA

1.566

1.64

1.714

V19-V20

Overcurrent Threshold current

VSOFT2 = 3.1V

V19-V20

Pulse skipping mode threshold

voltage

Vin > 6.8V

V20

Over voltage threshold ON

V2SNS

1.843

1.9

1.957

Under voltage threshold ON

V2SNS

1.451

1.496

1.541

PWM CONTROLLERS CHARACTERISTICS

fOSC

Switching frequency accuracy

OSC = 2.5V

OSC = GND OR 5V

255

170

300

200

345

230

KHz

V15

Voltage range for 300KHz

operation

2.4

2.6

Dead time

HS rise

LS rise

Tov

Over voltage propagation time

V1SNS to PWROK or

V2SNS to PWROK

1.25

µs

Tuv

Under voltage propagation time

V1SNS to PWROK or

V2SNS to PWROK

1.5

µs

V5,V20

Output UVLO threshold latched

Respect output voltage

I8,I17

Soft start current

3.2

4.8

µA

V8,V17

Soft start clamp voltage

3.1

HIGH AND LOW SIDE GATE DRIVER (BOTH SECTIONS)

I25,I27

I32,I30

Source output peak current

Cload = 3.3nF

Sink output peak current

Cload = 3.3nF

RdsON resistance

Driver out high

2.1

Ohm

RdsON resistance

Driver out low

1.5

Ohm

VOH

Output high voltage

HSTRAP = PREG5

Isource = 10mA;

HSOURCE = GND

4.4

5.3

5.61

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

ELECTRICAL CHARACTERISTICS (continued)

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