NCP1596A

http://onsemi.com

4

PIN FUNCTION DESCRIPTIONS

Pin #

Symbol

Pin Description

1

FB

Feedback pin. Part is internally compensated. Only necessary to place a voltage divider or connect the out-

put directly to this pin.

2

GND

Ground

3

LX

Pin connected internally to power switch. Connect externally to inductor.

4

VCCP

Power connection to the power switch.

5

VCC

IC power connection.

6

EN

Device Enable pin. This pin has an internal current source pull up. No connect is enable the device. With this

pin pulled down below 0.8 V, the device is disabled and enters the shutdown mode.

Figure 2. Detail Block Diagram

Oscillator

L1

C2

R1

R2

Soft Start

VCC

VCCP

EN

FB

LX

GND

C1

D1

S

R

Ton(min)

disable

driver

Thermal

Shutdown

UVLO

500 nA

0.8 V

Isense

Short

protect

Isense

Q

Q

Vin

circuit

EXTERNAL COMPONENT REFERENCE DATA

Inductor Model

Inductor (L1)

Diode (D1)

R1

R2

3.3 V

CDC5D23 3R3 (1 A)

CDRH6D38 3R3 (1.5 A)

3.3 mH

MBRA210LT3G

22 mF

22 mF x 2

22 mF

22 mF x 2

31 k

10 k

2.5 V

CDC5D23 3R3 (1 A)

CDRH6D38 3R3 (1.5 A)

3.3 mH

MBRA210LT3G

22 mF

22 mF x 2

22 mF

22 mF x 2

21 k

10 k

1.5 V

CDC5D23 3R3 (1 A)

CDRH6D38 3R3 (1.5 A)

3.3 mH

MBRA210LT3G

22 mF

22 mF x 2

22 mF

22 mF x 2

8 k

10 k

1.2 V

CDC5D23 3R3 (1 A)

CDRH6D38 3R3 (1.5 A)

3.3 mH

MBRA210LT3G

22 mF

22 mF x 2

22 mF

22 mF x 2

5 k

10 k