- 您現(xiàn)在的位置：買賣IC網 > PDF目錄383343 > MAX1971 (Maxim Integrated Products, Inc.) Fixed-Point Digital Signal Processor 532-FCBGA PDF資料下載
參數資料
| 型號： | MAX1971 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 數字信號處理 |
| 英文描述： | Fixed-Point Digital Signal Processor 532-FCBGA |
| 中文描述： | 雙路、180°異相、1.4MHz、750mA、降壓型調節(jié)器，帶有POR和RSI/PFO |
| 文件頁數： | 19/20頁 |
| 文件大小： | 371K |
| 代理商： | MAX1971 |
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PDF資料 |
PDF描述 |
|---|---|
| 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 |
| MAX1973 | Smallest 1A, 1.4MHz Step-Down Regulators |
| MAX1973EUB | Smallest 1A, 1.4MHz Step-Down Regulators |
| MAX1974EUB | Smallest 1A, 1.4MHz Step-Down Regulators |
相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX19710ETN | 功能描述:ADC / DAC多通道 RoHS:否 制造商:Texas Instruments 轉換速率: 分辨率:8 bit 接口類型:SPI 電壓參考: 電源電壓-最大:3.6 V 電源電壓-最小:2 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-40 |
| MAX19710ETN+ | 功能描述:ADC / DAC多通道 7.5Msps CODEC/AFE Full Duplex RoHS:否 制造商:Texas Instruments 轉換速率: 分辨率:8 bit 接口類型:SPI 電壓參考: 電源電壓-最大:3.6 V 電源電壓-最小:2 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-40 |
| MAX19710ETN+T | 功能描述:ADC / DAC多通道 7.5Msps CODEC/AFE Full Duplex RoHS:否 制造商:Texas Instruments 轉換速率: 分辨率:8 bit 接口類型:SPI 電壓參考: 電源電壓-最大:3.6 V 電源電壓-最小:2 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-40 |
| MAX19710ETN-T | 功能描述:ADC / DAC多通道 RoHS:否 制造商:Texas Instruments 轉換速率: 分辨率:8 bit 接口類型:SPI 電壓參考: 電源電壓-最大:3.6 V 電源電壓-最小:2 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-40 |
| MAX19710EVCMODU+ | 功能描述:數據轉換 IC 開發(fā)工具 MAX19710 Eval System RoHS:否 制造商:Texas Instruments 產品:Demonstration Kits 類型:ADC 工具用于評估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
發(fā)布緊急采購，3分鐘左右您將得到回復。