MAX8794ETB(2006) 查看數據表（PDF） - Maxim Integrated

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MAX8794ETB
(Rev.:2006)

Low-Voltage DDR Linear Regulator

Maxim Integrated 

Low-Voltage DDR Linear Regulator

Detailed Description

The MAX8794 is a low-voltage, low-dropout DDR termi-

nation linear regulator with an external bias supply

input and a buffered reference output (see Figures 1

and 2). VCC is powered by a 2.7V to 3.6V supply that is

commonly available in laptop and desktop computers.

The 3.3V bias supply drives the gate of the internal

pass transistor, while a lower voltage input at the drain

of the transistor (IN) is regulated to provide VOUT. By

using separate bias and power inputs, the MAX8794

can drive an n-channel high-side MOSFET and use a

lower input voltage to provide better efficiency.

The MAX8794 regulates its output voltage to the volt-

age at REFIN. When used in DDR applications as a ter-

mination supply, the MAX8794 delivers 1.25V or 0.9V at

3A peak (typ) from an input voltage of 1.1V to 3.6V. The

MAX8794 sinks up to 3A peak (typ) as required in a ter-

mination supply. The MAX8794 provides shoot-through

protection, ensuring that the source and sink MOSFETs

do not conduct at the same time, yet produces a fast

source-to-sink load transient.

VIN =

1.1V TO 3.6V

CIN2

10µF

3.3V BIAS

SUPPLY

R3

100kΩ

POWER-GOOD

C1

1.0µF

OFF

VDDQ

ON

R1

10kΩ

R2

10kΩ

CREFIN

1000pF

VOUT = VTT = VDDQ / 2

IN

OUT

MAX8794

COUT1

100µF

VCC

PGND

AGND

PGOOD

SHDN

OUTS

REFIN

REFOUT

VREFOUT = VTTR

CREFOUT

0.33µF

Figure 1. Standard Application Circuit

3.3V BIAS

SUPPLY

OFF ON

VDDQ

VTTR

POWER-

GOOD

VCC

SOFT-

UVLO

EN START

IN

SHDN

THERMAL

SHDN

REFIN

OUT

Gm

REFOUT

AGND

PGOOD

DELAY

LOGIC

REFIN

+150mV

REFIN

-150mV

PGND

12kΩ

OUTS

EN

8Ω

MAX8794

INPUT

1.1V TO 3.6V

VTT

Figure 2. Functional Diagram

8 _______________________________________________________________________________________

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