NX2415 datasheet(1/21 Pages) MICROSEMI

Il numero della parte	NX2415

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

PDF	21 Pages

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Produttore elettronici	MICROSEMI [Microsemi Corporation]

Homepage	http://www.microsemi.com

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NX2415

1

Rev.4.8

05/06/08

TYPICAL APPLICATION

DESCRIPTION

The NX2415 is a two-phase PWM controller with inte-

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.

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

keeping the synchronous MOSFET off during SW node

transition, accurate programmable droop allowing to re-

duce number of output capacitors, accurate enable cir-

cuit provides programmable start up point for Bus volt-

age, PGOOD output, programmable switching frequency

and hiccup current limiting circuitry.

n Differential inductor DCR sensing eliminates the

problem with layout parasitic

n External programmable voltage droop

n Low Impedance On-board Drivers

n Hiccup current limit

n Power Good for power sequencing

n Enable Signal allows external shutdown as well as

programming the BUS voltage start up threshold

n Programmable frequency

n Prebias start up

n Over voltage protection without negative spike at

output

n Pb-free and RoHS compliant

ORDERING INFORMATION

FEATURES

TWO PHASE SYNCHRONOUS PWM CONTROLLER WITH

INTEGRATED FET DRIVER AND DIFFERENTIAL CURRENT SENSE

APPLICATIONS

n Graphic card High Current Vcore Supply

n High Current +40A on board DC to DC converter

applications

PRELIMINARY DATA SHEET

Evaluation board available.

Device

Temperature

Package

Frequency

Pb-Free

NX2415CMTR

0 to 70oC

MLPQ-32L

200kHz to 1MHz

Yes

Figure1 - Typical application of NX2415

10k

8

1

OCP

VREF

6

4

2

31

32

7

3

28

30

29

11

+5V

1.8nF

3.92k

150pF

5.62k

6.8nF

10nF

2.2nF

430

220nF

10k

45.3k

op

+5V

6.49k

1.65k

10k

10

1uF

+12V

FB

VCOMP

VP

CSCOMP

PGOOD

RT

DROOP

ENBUS

EN

VCC

AGND

LDRV2

HDRV2

SW2

CS-2

CS+2

BST2

PGND2

PVCC2

LDRV1

HDRV1

SW1

CS-1

CS+1

BST1

PGND1

PVCC1

22

26

25

M1

M2

2 x (1000uF,7mohm ESR)

24

0.22uF

23

21

1uH

180uF

100uF

VOUT

+1.2V/50A

+5V

VIN1

+12V

9

10

1uF

620

1uF

620

0.68uH

19

15

16

M3

M4

17

0.22uF

18

20

+5V

12

13

1uF

620

1uF

620

0.68uH

PGSEN

VOUT

5

20k

100k

180k

2N3906

1k

14

1nF

IOUT

10nF

10k

1nF

20k

2 x 10uF

10uF

2.15

Pb Free Product

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