ML6554 Ver la hoja de datos (PDF) - Fairchild Semiconductor

Número de pieza

componentes Descripción

Fabricante

ML6554

3A Bus Termination Regulator

Fairchild Semiconductor 

ML6554

PRODUCT SPECIFICATION

2.5V TO 4V

VTT

TO SDRAMS

GND

C1

820µF

F2V

OS-CON

L1 3.3µH

C3 10µF

C2

0.1µF

U1

ML6554

1

VDD

2 PVDD1

3

VL1

4

PGND1

5

PGND2

6

VL2

7

PVDD2

8

DGND

16

AVCC

15

VCCQ

14

VREFOUT

13

AGND

12

SHDN

11

VREFIN

10

VFB

9

VDD

R1 100kΩ

R2 1kΩ

C4 1nF

R3

100kΩ

Figure 3. Alternate Application Circuit

C5

C6

330µF 330µF

VCCQ

VREFOUT

SHDN

VREFIN

GND

An alternate application circuit for the ML6554 is shown in

Figure 3. The number of external components is reduced

compared to the circuit in Figure 2. This is achieved by

replacing four, 0.1µF bypass capacitors with one, low ESR,

10µF ceramic capacitor placed right next to U1. Two 100Ω

resistors are also eliminated. High value, surface-mount

MLC capacitors were not available when the original appli-

cation circuit (Figure 2) was developed. Both application

circuits offer the same electrical performance but that shown

in Figure 2 has a reduced bill-of-materials. Table 2 shows the

recommended parts list for the circuit of Figure 3.

6

REV. 1.1.3 3/8/02

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