L4992 datasheet(4/26 Pages) STMICROELECTRONICS

4 / 26 page

ELECTRICAL CHARACTERISTICS (VIN = 12V; TJ = 25°C; VOSC = GND; unless otherwise specified.)

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

DC CHARACTERISTICS

VIN

Input Supply Voltage

5.5

Operating Quiescent Current

R5GATE = R3GATE = OPEN

H5GATE = H3GATE = OPEN

RUN3 = RUN5 = REG5

(DRIVERS OFF)

1.35

Stand-By Current

RUN3 = RUN5 = GND

VIN = 12V

VIN = 20V

100

120

µA

+5.1V PWM CONTROLLER SECTION

V5OUT (*)

V5SNS Feedback Voltage

VIN = 5.5 to 20V;

VI5SNS - VV5SNS = 0 to 70mV

4.85

5.13

5.25

V6 - V5

Over-Current Threshold Voltage

VSOFT5 = 4V

100

120

V6 - V5

Pulse Skipping Mode

Thereshold Voltage

VIN > 6.8V

VIN < 5.8V

Over Voltage Threshold ON

V5SNS

5.35

5.55

5.77

Under Voltage Threshold ON

V5SNS

4.54

4.69

4.87

+3.3V PWM CONTROLLER SECTION

V3OUT (*)

V3SNS Feedback Voltage

VIN = 5.5 to 20V;

VI3SNS - VV3SNS = 0 to 70mV

3.285

3.39

3.495

V19 - V20

Over Current Threshold Voltage

VSOFT3 = 4V

100

120

V19 - V20

Pulse Skipping Mode Threshold

Voltage

VIN = 5.5 to 20V;

V20

Over Voltage Threshold ON

V3SNS

3.55

3.7

3.85

Under Voltage Threshold ON

V3SNS

3.02

3.14

3.27

PWM CONTROLLERS CHARACTERISTICS (BOTH SECTIONS)

FOSC

Switching Frequency Accuracy

OSC = REG5/2

255

300

345

kHz

OSC = 0 or REG5

170

200

230

kHz

V15

Voltage Range for 300kHz

Operation

2.4

2.6

TOFF

Dead Time

300

375

450

TOV

Overvoltage Propagation Time

V5SNS to PWROK or

V3SNS to PWROK

1.25

µs

TUV

Undervoltage Propagation Time

V5SNS to PWROK or

V3SNS to PWROK

1.5

µs

I8, I17

Soft Start Charge Current

3.2

4.8

µA

V8, V17

Soft Start Clamp Voltage

(*) Guaranteed by design, not tested in production

L4992

4/26

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