MAX1963EZT085-T(2003) Ver la hoja de datos (PDF) - Maxim Integrated

Número de pieza

componentes Descripción

Fabricante

MAX1963EZT085-T
(Rev.:2003)

Low-Input-Voltage, 300mA LDO Regulators with RESET in SOT and TDFN

Maxim Integrated 

Low-Input-Voltage, 300mA LDO Regulators

with RESET in SOT and TDFN

Pin Description

PIN

SOT23 TDFN

1

6

2

—

—

4

3

5

4

3

5

2

6

1

—

Exposed

Pad

NAME

IN

GND

GND

SHDN

RESET

I.C.

OUT

EP

FUNCTION

Regulator Input. Supply voltage can range from +1.62V to +3.6V. Bypass IN with at least a 1µF

ceramic capacitor to GND (see the Capacitor Selection and Regulator Stability section).

Ground. GND also functions as a heatsink. Solder to a large pad or circuit-board ground plane to

maximize SOT23 power dissipation.

Ground

Active-Low Shutdown Input. A logic low reduces supply current to below 1µA. Connect to IN or

logic high for normal operation.

Open-Drain, Active-Low Reset Output. RESET rises 3.2ms (MAX1963) or 100ms (MAX1976) after

the output has achieved regulation. RESET falls immediately if VOUT drops below 82.5% of its

nominal voltage, or if the MAX1963/MAX1976 are shut down.

Internally Connected. Leave floating or connect to GND.

Regulator Output. Sources up to 300mA. Bypass with a 4.7µF low-ESR ceramic capacitor to GND.

Ground. EP also functions as a heatsink. Solder EP to a large pad or circuit-board ground plane

to maximize TDFN power dissipation.

Detailed Description

The MAX1963/MAX1976 are low-dropout, high-accuracy,

low-quiescent-current linear regulators designed primarily

for battery-powered applications. These devices supply

loads up to 300mA and are available with preset output

voltages from +0.75V to +3.0V. As illustrated in Figure 1,

the MAX1963/MAX1976 consist of a reference, an error

amplifier, a P-channel pass transistor, an internal feed-

back voltage-divider, and a power-good comparator.

The reference is connected to the error amplifier, which

compares this reference with the feedback voltage and

amplifies the difference. If the feedback voltage is

lower than the reference voltage, the pass-transistor

gate is pulled lower, which allows more current to pass

to the output and increases the output voltage. If the

feedback voltage is too high, the pass-transistor gate is

pulled up, allowing less current to pass to the output.

IN

SHDN

SHUTDOWN

LOGIC

MAX1963

MAX1976

ERROR

AMP

MOS DRIVER

WITH ILIMIT

P

OUT

THERMAL

SENSOR

REF

82.5%

REF

TIMER

GND

RESET

Figure 1. Functional Diagram

6 _______________________________________________________________________________________

Share Link: