參數(shù)資料
型號(hào)： MAX1970
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、180°異相、1.4MHz、750mA、降壓型調(diào)節(jié)器，帶有POR和RSI/PFO
文件頁(yè)數(shù)： 19/20頁(yè)
文件大小： 371K
代理商： MAX1970
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
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
MAX1973 Smallest 1A, 1.4MHz Step-Down Regulators
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX19700ETM 功能描述:ADC / DAC多通道 RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率: 分辨率:8 bit 接口類(lèi)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-40
MAX19700ETM+ 功能描述:ADC / DAC多通道 7.5Msps CODEC/AFE 1.8/2.7-3.3V RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率: 分辨率:8 bit 接口類(lèi)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-40
MAX19700ETM+T 功能描述:ADC / DAC多通道 7.5Msps CODEC/AFE 1.8/2.7-3.3V RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率: 分辨率:8 bit 接口類(lèi)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-40
MAX19700ETM-T 功能描述:ADC / DAC多通道 RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率: 分辨率:8 bit 接口類(lèi)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-40
MAX19700EVCMOD2 功能描述:ADC / DAC多通道 Evaluation Kit/Evaluation System for the MAX19700 RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率: 分辨率:8 bit 接口類(lèi)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-40
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*