NCP1402

http://onsemi.com

2

1

3

GND

CE

2

OUT

NC

4

LX

5

NCP1402

Figure 1. Typical Step−Up Converter Application

POWER

SWITCH

OUT

2

−

+

VOLTAGE

REFERENCE

SOFT−START

PFM

CONTROLLER

PFM

OSCILLATOR

DRIVER

PFM

COMPARATOR

NC

3

GND

4

LX

5

1 CE

Figure 2. Representative Block Diagram

PIN FUNCTION DESCRIPTIONS

Pin #

Symbol

Pin Description

1

CE

Chip Enable pin

(1) The chip is enabled if a voltage which is equal to or greater than 0.9 V is applied

(2) The chip is disabled if a voltage which is less than 0.3 V is applied

(3) The chip will be enabled if it is left floating

2

OUT

Output voltage monitor pin, also the power supply pin of the device

3

NC

No internal connection to this pin

4

GND

Ground pin

5

LX

External inductor connection pin to power switch drain