NCV890200 datasheet(11/18 Pages) ONSEMI

Part #	NCV890200

Description	2 A, 2 MHz Automotive Buck Switching Regulator

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NCV890200

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11

GENERAL INFORMATION

INPUT VOLTAGE

An Undervoltage Lockout (UVLO) circuit monitors the

input, and inhibits switching and resets the Soft−start circuit

if there is insufficient voltage for proper regulation. The

NCV890200 can regulate a 3.3 V output with input voltages

above 4.5 V and a 5.0 V output with an input above 6.5 V.

The NCV890200 withstands input voltages up to 40 V.

To limit the power lost in generating the drive voltage for

the Power Switch, the switching frequency is reduced by a

factor of 2 when the input voltage exceeds the VIN

Frequency Foldback threshold VFLDUP (see Figure 25).

Frequency reduction is automatically terminated when the

input voltage drops back below the VIN Frequency Foldback

threshold VFLDDN.

418

20

36

VIN (V)

1

2

Fsw

(MHz)

Figure 25. NCV890200 Switching Frequency

Reduction at High Input Voltage

ENABLE

The NCV890200 is designed to accept either a logic level

signal or battery voltage as an Enable signal. EN low induces

a ‘sleep mode’ which shuts off the regulator and minimizes

its supply current to a couple of

mA typically (IqSD) by

disabling all functions. Upon enabling, voltage is

established at the DRV pin, followed by a soft−start of the

switching regulator output.

SOFT−START

Upon being enabled or released from a fault condition,

and after the DRV voltage is established, a soft−start circuit

ramps the switching regulator error amplifier reference

voltage to the final value. During soft−start, the average

switching frequency is lower than its normal mode value

(typically 2 MHz) until the output voltage approaches

regulation.

SLOPE COMPENSATION

A fixed slope compensation signal is generated internally

and added to the sensed current to avoid increased output

voltage ripple due to bifurcation of inductor ripple current

at duty cycles above 50%. The fixed amplitude of the slope

compensation signal requires the inductor to be greater than

a minimum value, depending on output voltage, in order to

avoid sub−harmonic oscillations. For 3.3 V and 5 V output

voltages, the recommended inductor value is 4.7

mH.

SHORT CIRCUIT FREQUENCY FOLDBACK

During severe output overloads or short circuits, the

NCV890200 automatically reduces its switching frequency.

This creates duty cycles small enough to limit the peak

current in the power components, while maintaining the

ability to automatically reestablish the output voltage if the

overload is removed. If the current is still too high after the

switching frequency folds back to 500 kHz, the regulator

enters an auto−recovery burst mode that further reduces the

dissipated power.

CURRENT LIMITING

Due to the ripple on the inductor current, the average

output current of a buck converter is lower than the peak

current setpoint of the regulator. Figure 26 shows − for a

4.7

mH inductor − how the variation of inductor peak current

with input voltage affects the maximum DC current the

NCV890200 can deliver to a load.

Figure 26. NCV890200 Load Current Capability

with 4.7

mH Inductor

1.6

1.7

1.8

1.9

2.0

2.1

2.2

2.3

0

5

10

15

20

25

30

35

40

INPUT VOLTAGE (V)

(5 VOUT)

(3.3 VOUT)

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