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參數(shù)資料
| 型號(hào)： | MAX1972EEE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Fixed-Point Digital Signal Processor 532-FCBGA |
| 中文描述： | 0.75 A SWITCHING REGULATOR, 1600 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | QSOP-16 |
| 文件頁(yè)數(shù)： | 19/20頁(yè) |
| 文件大?。?/td> | 371K |
| 代理商： | MAX1972EEE |
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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
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1972EEE+ | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Dual 180 Out 1.4MHz 750mA Step-Down RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MAX1972EEE+T | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Dual 180 Out 1.4MHz 750mA Step-Down RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MAX1972EEE-G05 | 功能描述:電流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MAX1972EEE-T | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MAX1972EEE-TG05 | 功能描述:電流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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