NCV890203

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4

Figure 3. Pin Connections

1

VIN

10

SW

2

DRV

3

RSTB

4

GND

9

BST

8

DELAY

7

FB

(Top View)

5

EN

6

COMP

PIN FUNCTION DESCRIPTIONS

Pin No.

Symbol

Description

1

VIN

Input voltage from battery. Place an input filter capacitor in close proximity to this pin.

2

DRV

Output voltage to provide a regulated voltage to the Power Switch gate driver.

3

RSTB

RSTB open drain output. Goes high impedence when the output is above 94% of its regulation level,

after the delay set by the DELAY pin times out. Goes low when the output is below 92 % of its

regulation level (sensed on the FB signal)

4

GND

Battery return, and output voltage ground reference.

5

EN

This TTL compatible Enable input allows the direct connection of Battery as the enable signal.

Grounding this input stops switching and reduces quiescent current draw to a minimum.

6

COMP

Error Amplifier output, for tailoring transient response with external compensation components.

7

FB

Feedback input pin to program output voltage, and detect pre−charged or shorted output conditions.

8

DELAY

Delay adjust input. Connecting an external capacitor adjusts the delay for the RSTB function.

9

BST

Bootstrap input provides drive voltage higher than VIN to the N−channel Power Switch for optimum

10

SW

Switching node of the Regulator. Connect the output inductor and cathode of the freewheeling diode

to this pin.

Exposed

Pad

Connect to Pin 4 (electrical ground) and to a low thermal resistance path to the ambient temperature

environment.