參數(shù)資料
型號(hào)： MAX1970-MAX1972
廠商： 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： 雙路，180Σ外的階段，1.4MHz的，750毫安降壓型POR和RSI的穩(wěn)壓器/警隊(duì)條例
文件頁數(shù)： 19/20頁
文件大小： 371K
代理商： MAX1970-MAX1972
As the load current decreases, the modulator pole also
decreases; however, the modulator gain increases
accordingly, and the closed-loop unity-gain frequency
remains the same. Below is a numerical example to cal-
culate R
C
and C
C
values of the typical application cir-
cuit of Figure 4, where:
V
OUT
= 2.5V
I
OUT(MAX)
= 0.6A
C
OUT
= 10μF
R
ESR
= 0.010
gm
EA
= 50μS
gm
C
= 2S
f
SWITCH
= 1.4 MHz
R
LOAD
= V
OUT
/ I
OUT(MAX)
= 2.5V / 0.6 A = 4.167
fp
MOD
= 1 / [2
π
C
OUT
(R
LOAD
+ R
ESR
)] = 1 / [2
π
10
10
-6
(4.167 + 0.01)] = 3.80 kHz.
fz
ESR
= 1 / [2
π
C
OUT
R
ESR
] = 1 / [2
π
10
10
-6
0.01] = 1.59 MHz.
Pick a closed-loop unity-gain frequency (fc) of 50kHz.
The power modulator gain at fc is:
G
MOD
(fc) = gmc
R
LOAD
fp
MOD
/ f
c
= 2
4.167
3.80k / 50k = 0.635
then:
R
C
= V
O
/ (gm
EA
V
FB
G
MOD
(fc)) = 2.5 / (50
10
-6
1.2
0.635)
≈
62k
C
C
= V
OUT
( C
OUT
/ R
C
)
I
OUT
(MAX) = 2.5
4.7
10
-6
/ 62k
0.6
≈
680pF
Applications Information
PC Board Layout
Careful PC board layout is critical to achieve clean and
stable operation. The switching power stage requires
particular attention. Follow these guidelines for good
PC board layout:
1) Place decoupling capacitors as close to IC pins as
possible. Keep power ground plane (connected to
PGND) and signal ground plane (connected to
GND) separate. Connect the two ground planes
together with a single connection from PGND to
GND.
2) Input and output capacitors are connected to the
power ground plane; all other capacitors are con-
nected to signal ground plane.
3) Keep the high-current paths as short and wide as
possible.
4) If possible, connect IN, LX1, LX2, and PGND sepa-
rately to a large land area to help cool the IC to fur-
ther improve efficiency and long-term reliability.
5) Ensure all feedback connections are short and
direct. Place the feedback resistors as close to the
IC as possible.
6) Route high-speed switching nodes away from sen-
sitive analog areas (FB1, FB2, COMP1, COMP2).
Chip Information
TRANSISTOR COUNT: 5428
PROCESS: BiCMOS
M
Dual, 180° Out-of-Phase, 1.4MHz, 750mA Step-
Down Regulator with POR and RSI/PFO
______________________________________________________________________________________
19
相關(guān)PDF資料
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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