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參數(shù)資料
| 型號： | MAX604 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Quadruple 2-Input Positive-NOR Gates 14-CDIP -55 to 125 |
| 中文描述： | 5V/3.3V或可調(diào)、低壓差、低IQ、500mA線性穩(wěn)壓器 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 134K |
| 代理商： | MAX604 |
the more positive of the two. The control circuitry can
then remain functioning and turn the pass transistor off,
limiting reverse currents back through the device. This
feature allows a backup regulator or battery pack to
maintain V
OUT
when the supply at IN fails.
Reverse-current protection activates when the voltage
on IN falls 6mV (20mV maximum) below the voltage on
OUT. Before this happens, currents as high as several
milliamperes can flow back through the device. After
switchover, typical reverse currents are limited to
0.01μA for as long as the condition exists.
__________Applic ations Information
Figure 6 illustrates the typical application for the
MAX603/MAX604.
Capac itor S elec tion and
Regulator S tability
Normally, use 0.1μF to 10μF capacitors on the input
and 10μF on the output of the MAX603/MAX604. The
larger input capacitor values provide better supply-
noise rejection and line-transient response. Improve
load-transient response, stability, and power-supply
rejection by using large output capacitors. For stable
operation over the full temperature range and with load
currents up to 500mA, 10μF is recommended. Using
capacitors smaller than 3.3μF can result in oscillation.
Noise
The MAX603/MAX604 exhibit 3mVp-p to 4mVp-p of
noise during normal operation. This is negligible in most
applications. When using the MAX603/MAX604 in appli-
cations that include analog-to-digital converters of
greater than 12 bits, consider the ADC’s power-supply
rejection specifications. Refer to the output noise plot in
the Typical Operating Characteristics
PS RR and Operation from S ourc es
Other than Batteries
The MAX603/MAX604 are designed to deliver low
dropout voltages and low quiescent currents in battery-
powered systems. Achieving these objectives requires
trading off power-supply noise rejection and swift
response to supply variations and load transients.
Power-supply rejection is 80dB at low freqencies and
rolls off above 10Hz. As the frequency increases above
10kHz, the output capacitor is the major contributor to
the rejection of power-supply noise (Figure 7). Do not
use power supplies with ripple above 100kHz, especial-
ly when the ripple exceeds 100mVp-p. When operating
from sources other than batteries, improved supply-
noise rejection and transient response can be achieved
by increasing the values of the input and output capaci-
tors, and through passive filtering techniques. The
Typical Operating Characteristics show the MAX603/
MAX604 supply and load-transient responses.
T ransient Considerations
The Typical Operating Characteristics show the
MAX603/MAX604 load-transient response. Two compo-
nents of the output response can be observed on the
load-transient graphs—a DC shift from the output imped-
ance due to the different load currents, and the transient
response. Typical transients for step changes in the load
current from 5mA to 500mA are 0.2V. Increasing the out-
put capacitor’s value attenuates transient spikes.
M
5V /3.3V or Adjustable, Low-Dropout,
Low I
Q
, 500mA Linear Regulators
_______________________________________________________________________________________
9
MAX603
MAX604
OFF
OUT
SET
GND
IN
C
OUT
10
μ
F
C
IN
BATTERY
OUTPUT
VOLTAGE
50
60
0
10
0
10
1
10
2
FREQUENCY (Hz)
10
3
10
4
10
5
10
6
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
10
M
P
20
30
40
80
90
70
I
OUT
= 1mA
V
IN
= 1V
p-p
FOR f < 400kHz
C
IN
= 0
μ
F
C
OUT
= 10
μ
F
I
OUT
= 100mA
Figure 6. 3.3V or 5V Linear-Regulator Application
Figure 7. Power-Supply Rejection Ratio vs. Ripple Frequency
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX603 | Quadruple 2-Input Positive-NAND Gates 14-CDIP -55 to 125 |
| MAX603CPA | Quadruple 2-Input Positive-NAND Gates 14-CDIP -55 to 125 |
| MAX603CSA | Quadruple 2-Input Positive-NAND Gates 14-CFP -55 to 125 |
| MAX603EPA | Quadruple 2-Input Positive-NOR Gates 14-CDIP -55 to 125 |
| MAX603ESA | Quadruple 2-Input Positive-NOR Gates 14-CFP -55 to 125 |
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