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參數(shù)資料
| 型號： | MAX878MJA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 5V/3.3V/3V/Adjustable-Output, Step-Up/Step-Down DC-DC Converters |
| 中文描述： | SWITCHING REGULATOR, 300 kHz SWITCHING FREQ-MAX, CDIP8 |
| 封裝： | 0.300 INCH, CERDIP-8 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 128K |
| 代理商： | MAX878MJA |
With ILIM shorted to IN, the peak switch current of the
internal NPN power switch is set to 1A. It can be set to
a lower value by connecting a resistor between ILIM
and IN (see Current Limitsection). This enables the use
of physically smaller inductors with lower saturation-
current ratings. At 1A, the switch voltage drop (V
SW
) is
about 500mV. V
SW
decreases to about 250mV at 0.1A.
Conventional PWM converters generate constant-
frequency switching noise, while this architecture
produces variable-frequency switching noise. The out-
put ripple is the product of the peak inductor current
and the output capacitor's ESR. Unlike conventional
pulse-skippers, the MAX877/MAX878/MAX879 peak
currents are scaled down at light loads, resulting in
lower output ripple.
S tep-Down Mode and Power Dissipation
In battery-powered applications, for example, where
the input voltage exceeds the output voltage, the
MAX877/MAX878/MAX879 behave as “switched” linear
regulators. If the output voltage starts to drop, the
switch turns on and energy is stored in the coil, as in
normal step-up mode. After the switch turns off, the
voltage at LX flies high. The active rectifier turns on
when LX rises above V
IN
. As in a linear regulator, the
voltage difference between V
IN
and V
OUT
appears
across the rectifier (actually a PNP transistor) until the
current goes to zero and the rectifier turns off. At high
V
IN
to V
OUT
differentials, the maximum load current is
limited by the maximum allowable power dissipation in
the package (see Typical Operating Characteristics).
M
5V /3.3V /3V /Adjustable-Output,
S tep-Up/S tep-Down DC-DC Converters
_______________________________________________________________________________________
7
MAX878
DELAY
TIMER
t
OFF
DELAY
TIMER
t
ON
VREF
0.2025V
SHUTDOWN
CONTROL
SHDN
7
ACTIVE RECTIFIER
RECTIFIER
CONTROL
OUT
PGND
AGND
3
SEL 8
4
6
100
μ
F
V
OUT
22
μ
F
V
IN
22
μ
H
R
LIM
SWITCH
DRIVER
LX
ILIM
IN
2
1
5
1 : N
Figure 1. MAX878 Block Diagram
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX879ESA | 5V/3.3V/3V/Adjustable-Output, Step-Up/Step-Down DC-DC Converters |
| MAX879MJA | 5V/3.3V/3V/Adjustable-Output, Step-Up/Step-Down DC-DC Converters |
| MAX881REUB | SCREW D LOCKING STEEL 5/16 |
| MAX881 | Low-Noise Bias Supply in レMAX with Power-OK for GaAsFET PA |
| MAX881R | Low-Noise Bias Supply in レMAX with Power-OK for GaAsFET PA |
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