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NCV8851DBG

Automotive Grade Synchronous Buck Controller

ON Semiconductor 

NCV8851

PACKAGE PIN DESCRIPTIONS − 20 Lead TSSOP

Package Pin#

Pin Symbol

Function

1

SYNC

External clock synchronization input.

2

VIN_CS

Supply input for the internal current sense amplifier.

3

VIN_IC

Supply input for internal logic and analog circuitry.

4

BST

Supply input for the floating top gate driver. An external diode, DBST, from 6VOUT and a

0.1 mF to 1 mF capacitor, CBST, to VSW forms a boost circuit.

5

GH

Gate driver output for the external high−side NMOS FET.

6

VSW

Switch−node. This pin connects to the source of the high−side MOSFET and drain of the

low−side MOSFET. This pin serves as the switch output to the inductor.

7

GL

Gate driver output for the external low−side NMOS FET.

8

PGND

Power Ground. Ground reference for the high−current path including the NMOS FETs and

output capacitor.

9

6VOUT

Output of internal fixed 6.0 V LDO.

10

AGND

Analog Ground. Ground reference for the internal logic and analog circuitry as well as ROSC

and the compensators.

11

EN

Enable input. When disabled, the LDO, internal logic and analog circuitry and gate drivers

enter sleep mode, drawing under 1 mA.

12

VIN

Supply input for the SMPS.

13

VFB

SMPS’s voltage feedback. Inverting input to the voltage error amplifier. Connect to VOUT

through a resistive divider.

14

VCOMP

SMPS’s voltage error amplifier output and non−inverting input to the current error amplifier.

15

CCOMP

SMPS’s current error amplifier output and inverting input to the PWM comparator.

16

CFB

SMPS’s current feedback. Inverting input to the current error amplifier.

17

CSOUT

Single−ended output of the differential current sense amplifier. Connect to CFB through a

resistor. Non−inverting input to the cycle−by−cycle overcurrent comparator.

18

CSN

Differential current sense amplifier inverting input.

19

CSP

Differential current sense amplifier non−inverting input.

20

ROSC

Oscillator’s frequency adjust pin. Resistor to ground sets the oscillator frequency.

MAXIMUM RATINGS (Voltages are with respect to AGND unless otherwise indicated.)

Rating

Value

Unit

Dc Supply Voltage (VIN)

Peak Transient Voltage (Load Dump, EN = 0 V)

−0.3 to 20

V

45

Dc Supply Voltage (VIN_CS)

Dc Supply Voltage (VIN_IC)

Pin Voltage (VSW)

t ≤ 50 ns

46

V

6.5

V

−0.7 to 40.7

V

−2

Pin Voltage (BST, GH)

Pin Voltage (GL)

46 wrt PGND

V

7 wrt VSW

−0.3 to 7 wrt PGND

V

Pin Voltage (EN)

−0.3 to 40

V

Pin Voltage (CSP, CSN)

−0.3 to 10

V

Pin Voltage (VFB, VCOMP, CSOUT, CFB, CCOMP, SYNC, ROSC, 6VOUT)

Pin Voltage (PGND)

−0.3 to 7

V

−0.3 to 0.3

V

Operating Junction Temperature

−40 to 150

°C

Storage Temperature Range

−65 to 150

°C

Peak Reflow Soldering Temperature: Lead−free 60 to 150 seconds at 217°C

265 peak

°C

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the

Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect

device reliability.

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