NX2415 View Datasheet(PDF) - Microsemi Corporation

Part Name

Description

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NX2415

TWO PHASE SYNCHRONOUS PWM CONTROLLER WITH INTEGRATED FET DRIVER AND DIFFERENTIAL CURRENT SENSE

Microsemi Corporation 

Evaluation board available.

NX2415

TWO PHASE SYNCHRONOUS PWM CONTROLLER WITH

INTEGRATED FET DRIVER AND DIFFERENTIAL CURRENT SENSE

PRELIMINARY DATA SHEET

Pb Free Product

DESCRIPTION

FEATURES

The NX2415 is a two-phase PWM controller with inte- n Differential inductor DCR sensing eliminates the

grated FET driver designed for low voltage high current

application. The two phase synchronous buck converter

offers ripple cancelation for both input and output. The

NX2415 uses differential remote sensing using either

current sense resistor or inductor DCR sensing to achieve

accurate current matching between the two channels.

n

n

n

n

n

problem with layout parasitic

External programmable voltage droop

Low Impedance On-board Drivers

Hiccup current limit

Power Good for power sequencing

Enable Signal allows external shutdown as well as

Differential sensing eliminates the error caused by PCB

board trace resistance that is otherwise is present when

using a single ended voltage sensing. In addition the

NX2415 offers high drive current capability especially for

n

n

n

programming the BUS voltage start up threshold

Programmable frequency

Prebias start up

Over voltage protection without negative spike at

keeping the synchronous MOSFET off during SW node output

transition, accurate programmable droop allowing to re- n Pb-free and RoHS compliant

duce number of output capacitors, accurate enable cir-

APPLICATIONS

cuit provides programmable start up point for Bus volt- n Graphic card High Current Vcore Supply

age, PGOOD output, programmable switching frequency n High Current +40A on board DC to DC converter

and hiccup current limiting circuitry.

applications

TYPICAL APPLICATION

+5V

10

31

VCC

1uF

10k

30

EN

+12V

6.49k

1.65k

29 ENBUS

+5V

op

45.3k

10k

7 DROOP

2 RT

28 PGOOD

VOUT

11 CSCOMP

430 220nF

1.8nF 3.92k

10k

2N3906

20k

2.2nF

10k

20k

5.62k

3 PGSEN

1nF

5 FB

6.8nF

6 VCOMP

150pF

PVCC1 23 1uF

+5V

1uH

BST1 24

HDRV1 25

SW1 26

2 x 10uF

180uF

0.22uF M1

2.15

0.68uH

LDRV1 22

M2

620

1uF

100uF

VIN1

+12V

VOUT

+1.2V/50A

2 x (1000uF,7mohm ESR)

PGND1 21

620

CS+1 9

CS-1 10

PVCC2 18 1uF

+5V

17

BST2

16

HDRV2

15

SW2

19

LDRV2

0.22uF

2.15

10uF

M3

0.68uH

M4

620

1uF

1k

180k

10nF

100k

4

8

VP

OCP

1 VREF

10nF

20

PGND2

CS+2 12

CS-2 13

620

1nF

14 IOUT

AGND

32

Figure1 - Typical application of NX2415

ORDERING INFORMATION

Device

NX2415CMTR

Temperature

0 to 70oC

Package

MLPQ-32L

Frequency

200kHz to 1MHz

Pb-Free

Yes

Rev.4.8

1

05/06/08

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