Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

DC CHARACTERISTICS

Input Supply Voltage

5.0

25

V

Operating Quiescent Current

R1GATE = R2GATE = OPEN

H1GATE = H2GATE = OPEN

RUN2 = RUN1 = SREG5

(DRIVERS OFF )

1.35

mA

Stand-By Current

RUN2= RUN1 = GND

50

60

100

120

µA

SECTION 1 PWM CONTROLLER

V1SNS Feedback Voltage

1.843

1.9

1.957

V

Over-Current Threshold Voltage

VSOFT1 = 4V

50

mV

Pulse Skipping Mode

Thereshold Voltage

13

mV

6.5

mV

Over Voltage Threshold ON

V1SNS

1.99

2.052

2.11

V

Under Voltage Threshold ON

V1SNS

1.695

1.748

1.80

V

SECTION 2 PWM CONTROLLER

V2SNS Feedback Voltage

1.610

1.66

1.709

V

Over Current Threshold Voltage

VSOFT2 = 4V

50

mV

Pulse Skipping Mode Threshold

Voltage

13

mV

Over Voltage Threshold ON

V2SNS

1.738

1.792

1.845

V

Under Voltage Threshold ON

V2SNS

1.48

1.527

1.572

V

PWM CONTROLLERS CHARACTERISTICS (BOTH SECTIONS)

Switching Frequency Accuracy

OSC = SREG5/2

255

300

345

kHz

OSC = 0 or SREG5

170

200

230

kHz

Voltage Range for 300kHz

Operation

2.4

2.6

V

Dead Time

300

375

450

ns

Overvoltage Propagation Time

V1SNS to PWROK or

V2SNS to PWROK

1.25

µs

Undervoltage Propagation Time

V1SNS to PWROK or

V2SNS to PWROK

1.5

µs

Output UVLO Threshold

Respect output voltage

70

%

Soft Start Charge Current

3.2

4

4.8

µA

Soft Start Clamp Voltage

4

V

(*) Guaranteed by design, not tested in production

L5994

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