MAX15048 Ver la hoja de datos (PDF) - Maxim Integrated

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componentes Descripción

Fabricante

MAX15048

Triple-Output Buck Controllers with Tracking/Sequencing

Maxim Integrated 

MAX15048/MAX15049

Triple-Output Buck Controllers

with Tracking/Sequencing

TOP VIEW

24 23 22 21 20 19 18 17

BST3 25

16 BST1

DH3 26

15 EN1

LX3 27

14 FB1

DREG3 28

DL3 29

MAX15048

MAX15049

13 COMP1

12 PGOOD

PGND3 30

IN 31

REG 32

EP*

+

11 COMP2

10 FB2

9 EN2

1 2345678

Pin Configuration

PIN

1

2

3

4

5

6

7

8

9

10

11

10  

*EXPOSED PAD.

TQFN

(5mm × 5mm)

Pin Description

NAME

RT

SGND

PGND2

DL2

DREG2

LX2

DH2

BST2

EN2

FB2

COMP2

FUNCTION

Oscillator Timing Resistor Connection. Connect a 15.6kI to 93.75kI resistor from RT to SGND to

program the switching frequency from 200kHz to 1.2MHz.

Analog Ground. Connect SGND and PGND_ together at one point near the input bypass capacitor

return terminal.

Controller 2 Power Ground. Connect the input filter capacitor’s negative terminal, the source of the

synchronous MOSFET, and the output filter capacitor’s return to PGND2.

Controller 2 Low-Side Gate-Driver Output. DL2 is the gate-driver output for the synchronous MOSFET.

Controller 2 Low-Side Gate-Driver Supply. Connect externally to REG through a 1I to 4.7I resistor.

Connect a minimum of 0.22FF ceramic capacitor from DREG2 to PGND2.

Controller 2 High-Side MOSFET Source Connection/Synchronous MOSFET Drain Connection.

Connect the inductor and the negative side of the boost capacitor to LX2.

Controller 2 High-Side Gate-Driver Output. DH2 drives the gate of the high-side MOSFET.

Controller 2 High-Side Gate-Driver Supply. Connect a 0.1FF ceramic capacitor from BST2 to LX2.

Controller 2 Enable/Tracking Input. See Figure 2. When tracking (MAX15048), connect the same

resistive voltage-divider used for FB2 from output 1 to EN2 to SGND for coincident tracking. Connect

EN2 to analog ground for ratiometric tracking. When sequencing (MAX15049), EN2 must be above

0.6V for PWM controller 2 to start.

Controller 2 Feedback Regulation Point. Connect to the center tap of a resistive voltage-divider from

the converter output to SGND to set the output voltage. The FB2 voltage regulates to 0.6V (typ).

Controller 2 Transconductance Error-Amplifier Output. Connect COMP2 to the compensation

feedback network of output 2.

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