NCV8842_11 datasheet(4/16 Pages) ONSEMI

Part #	NCV8842

Description	1.5 A, 170 kHz, Buck Regulator with Synchronization Capability

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NCV8842

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ELECTRICAL CHARACTERISTICS (−40°C < TJ < 150°C, 4.5 V< VIN < 40 V; unless otherwise specified.)

Characteristic

Test Conditions

Min

Typ

Max

Unit

Oscillator

Operating Frequency

−

153

170

187

kHz

Frequency Line Regulation

−

0.05

0.15

%/V

Maximum Duty Cycle

−

85

90

95

%

VFB Frequency Foldback Threshold

−

0.29

0.32

0.36

V

PWM Comparator

Slope Compensation Voltage

Fix VFB, DVC/DTON

5.0

9.0

17

mV/ms

Minimum Output Pulse Width

VFB to VSW

−

100

200

ns

Power Switch

Current Limit

VFB > 0.36 V

1.6

2.3

3.0

A

Foldback Current

VFB < 0.29 V

0.9

1.5

2.1

A

Saturation Voltage

IOUT = 1.5 A, VBOOST = VIN + 2.5 V

0.4

0.7

1.0

V

Current Limit Delay

(Note 5)

−

120

160

ns

Error Amplifier

Internal Reference Voltage

−

1.244

1.270

1.296

V

Reference PSRR

(Note 5)

−

40

−

dB

FB Input Bias Current

−

0.02

0.1

mA

Output Source Current

VC = 1.270 V, VFB = 1.0 V

15

25

35

mA

Output Sink Current

VC = 1.270 V, VFB = 2.0 V

15

25

35

mA

Output High Voltage

VFB = 1.0 V

1.39

1.46

1.53

V

Output Low Voltage

VFB = 2.0 V

5.0

20

60

mV

Unity Gain Bandwidth

(Note 5)

−

500

−

kHz

Open Loop Amplifier Gain

(Note 5)

−

70

−

dB

Amplifier Transconductance

(Note 5)

−

6.4

−

mA/V

Sync

Sync Frequency Range

−

190

−

355

kHz

Sync Pin Bias Current

VSYNC = 5.0 V

−

360

485

mA

Sync Threshold Voltage

−

0.9

1.5

1.9

V

Shutdown

Shutdown Threshold Voltage

−

1.0

1.3

1.6

V

SHDNB Input Current

Vin = 5.0 V, (Note 5)

−

4.0

−

mA

Thermal Shutdown

Overtemperature Trip Point

(Note 5)

175

185

195

°C

Thermal Shutdown Hysteresis

(Note 5)

−

42

−

°C

5. Guaranteed by design, not 100% tested in production.

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