NCP81145 datasheet(5/9 Pages) ONSEMI

Part #	NCP81145

Description	Compatible Synchronous Buck MOSFET Driver

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP81145

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NCP81145 ELECTRICAL CHARACTERISTICS (−40°C < TA < +125°C; 4.5 V < VCC < 5.5 V, 4.5 V < BST−SWN < 5.5 V,

4.5 V < BST < 30 V, 0 V < SWN < 21 V, unless otherwise noted)

Parameter

Test Conditions

Min

Typ

Max

Unit

SUPPLY VOLTAGE

VCC Operation Voltage

4.5

5.5

V

UNDERVOLTAGE LOCKOUT

VCC Start Threshold

3.8

4.35

4.5

V

VCC UVLO Hysteresis

150

200

250

mV

SUPPLY CURRENT

Shutdown Mode

ICC + IBST, EN = GND

11

20

mA

Normal Mode

ICC + IBST, EN = 5 V, PWM = OSC

4.7

mA

Standby Current

ICC + IBST, EN = HIGH, PWM = LOW,

No loading on DRVH & DRVL

0.9

mA

Standby Current

ICC + IBST, EN = HIGH, PWM = HIGH,

No loading on DRVH & DRVL

1.1

mA

BOOTSTRAP DIODE

Forward Voltage

VCC = 5 V, forward bias current = 2 mA

0.1

0.4

0.6

V

PWM INPUT

PWM Input High

3.4

V

PWM Mid−State

1.3

2.7

V

PWM Input Low

0.7

V

ZCD Blanking Timer

350

ns

HIGH SIDE DRIVER

Output Impedance, Sourcing Current

VBST−VSW = 5 V

0.9

1.7

W

Output Impedance, Sinking Current

VBST−VSW = 5 V

0.7

1.7

W

DRVH Rise Time trDRVH

VCC = 5 V, 3 nF load, VBST−VSW = 5 V

16

25

ns

DRVH Fall Time tfDRVH

VCC = 5 V, 3 nF load, VBST−VSW =5 V

11

18

ns

DRVH Turn−Off Propagation Delay tpdlDRVH

CLOAD = 3 nF

10

30

ns

DRVH Turn−On Propagation Delay tpdhDRVH

CLOAD = 3 nF

10

40

ns

SW Pulldown Resistance

SW to PGND

45

kW

DRVH Pulldown Resistance

DRVH to SW, BST−SW = 0 V

45

kW

LOW SIDE DRIVER

Output Impedance, Sourcing Current

0.9

1.7

W

Output Impedance, Sinking Current

0.4

0.8

W

DRVL Rise Time trDRVL

CLOAD = 3 nF

16

25

ns

DRVL Fall Time tfDRVL

CLOAD = 3 nF

11

15

ns

DRVL Turn−Off Propagation Delay tpdlDRVL

CLOAD = 3 nF

10

30

ns

DRVL Turn−On Propagation Delay tpdhDRVL

CLOAD = 3 nF

5.0

25

ns

DRVL Pulldown Resistance

DRVL to PGND, VCC = PGND

45

kW

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