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参数资料
| 型号： | MAX1970-MAX1972 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | Dual, 180∑ Out-of-Phase, 1.4MHz, 750mA Step- Down Regulator with POR and RSI/PFO |
| 中文描述： | 双路，180Σ外的阶段，1.4MHz的，750毫安降压型POR和RSI的稳压器/警队条例 |
| 文件页数： | 14/20页 |
| 文件大小： | 371K |
| 代理商： | MAX1970-MAX1972 |
M
Design Procedure
Output Voltage Selection
Both output voltages can be selected in three different
ways as indicated by Table 1. Each output has two pre-
set voltages that can be set using FBSEL_ and it can
also be set to any voltage from 0.8V to V
IN
by using an
external resistor voltage-divider.
To use a resistor-divider to set the output voltage to
1.2V or higher (Figure 5), connect a resistor from FB_ to
OUT_ (R_
a
), and connect a resistor from FB_ to GND
(R_
b
). Select the value of R_
b
, between 10k
and
30k
. Then R_
a
is calculated by:
A resistor-divider can also be used to set the voltage of
one output from 0.8V to 1.2V. To do this, the other out-
put must be above 1.2V. Figure 6 shows an example of
this where OUT1 is set to 1V. To set the output voltage to
less than 1.2V, connect a resistor from FB1 to OUT1 (R1),
and from FB1 to OUT2 (R2). Select values of R1 and R2
such that current flowing through R1 and R2 is about
100μA and following equation is satisfied:
Each output is capable of continuously sourcing up to
750mA of current as long as the following condition is
met:
Inductor Value
A 3.3μH to 6.8μH inductor with a saturation current of
800mA (min) is recommended for most applications.
For best efficiency, the inductor
’
s DC resistance should
be less than 100m
, and saturation current should be
greater than 1A. See Table 2 for recommended induc-
tors and manufacturers.
V
I
V
I
V
A
OUT
OUT
OUT
OUT
IN
1
1
2
2
1 05
≤
.
×
+
×
R
R
V
V
OUT
1
OUT
1
21 2
1 2
.
2
=
.
R
R
V
a
b
OUT
1.
_
_
=
×
1
Dual, 180° Out-of-Phase, 1.4MHz, 750mA Step-
Down Regulator with POR and RSI/PFO
14
______________________________________________________________________________________
Figure 2. Timing Diagram
V
OUT
T
D
RSI
~1V PKMAX
V
IN
PFO
4.04V
3.94V
T
RESET
= 1
μ
s MIN
T
D
POR
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1970 | Dual, 180∑ Out-of-Phase, 1.4MHz, 750mA Step- Down Regulator with POR and RSI/PFO |
| MAX1970EEE | Fixed-Point Digital Signal Processor 532-FCBGA |
| MAX1971 | Fixed-Point Digital Signal Processor 532-FCBGA |
| MAX1972 | Dual, 180∑ Out-of-Phase, 1.4MHz, 750mA Step- Down Regulator with POR and RSI/PFO |
| MAX1972EEE | Fixed-Point Digital Signal Processor 532-FCBGA |
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