ncp3121 ON Semiconductor, ncp3121 Datasheet

ncp3121

Manufacturer Part Number

ncp3121

Description

Dual 3.0 A, Step-down Dc/dc Switching Regulator

Manufacturer

ON Semiconductor

Datasheet

1.NCP3121.pdf (40 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

ncp3121MNTXG

Manufacturer:

ON/安森美

Quantity:

20 000

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NCP3121

Dual 3.0 A, Step-Down

DC/DC Switching Regulator

applications requiring high efficiency. This device is capable of

producing an output voltage as low as 0.8 V. The NCP3121 provides

dual 3.0 A switching regulators with an adjustable 200 kHz - 750 kHz

switching frequency. The switching frequency is set by an external

resistor. The NCP3121 also incorporates an auto-tracking and

sequencing feature. Protection features include cycle-by-cycle

current limit and undervoltage lockout (UVLO). The NCP3121 comes

in a 32-pin QFN package.

Features

•

Typical Applications

•

February, 2008 - Rev. 0

The NCP3121 is a dual buck converter designed for low voltage

Telecommunications

Input Voltage Range from 4.5 V to 13.2 V

12 V

200-750 kHz Operation

Stable with Low ESR Ceramic Output Capacitor

0.8 ±1.5% FB Reference Voltage

External Soft-Start

Out of Phase Operation of OUT1 & OUT2

Auto-Tracking and Sequencing

Enable/Disable Capability

Hiccup Overload Protection

Low Shutdown Power (I

Set-Top Boxes, Portable Applications, Networking and

DSP/mP/FPGA Core

Disable

to 5.0 V

Enable

R_TRACK

out

PG1

PG2

EN1

EN2

= 85% Efficiency Min @ 3.0 A

< 100 mA)

R24

R14

GND

Figure 1. Typical Application Circuit

PG1

PG2

EN1

SEQ1

EN2

SEQ2

TRACK1,2

GND

NCP3121

R23

C23

GND

C22

GND

RVIN

R13

C13

GND

SW1

VIN

SW2

C12

See detailed ordering and shipping information in the package

dimensions section on page 39 of this data sheet.

GND

CASE 488AM

(Note: Microdot may be in either location)

QFN32

ORDERING INFORMATION

NCP3121 = Specific Device Code

D11

D21

GND

L11

L21

http://onsemi.com

VIN

GND

= Assembly Location

= Wafer Lot

= Year

= Work Week

= Pb-Free Package

Publication Order Number:

MARKING DIAGRAM

R11

R12

R21

R22

AWLYYWWG

NCP3121

GND

NCP3121/D

C11

C21

GND

OUT1

OUT2

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