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參數(shù)資料
| 型號(hào)： | MAX1974EUB |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Smallest 1A, 1.4MHz Step-Down Regulators |
| 中文描述： | 2.4 A SWITCHING REGULATOR, 1600 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | MICRO, SOP-10 |
| 文件頁數(shù)： | 12/15頁 |
| 文件大?。?/td> | 331K |
| 代理商： | MAX1974EUB |
M
where f
SW
is the switching frequency (1.4
10
6
Hz), and
LIR is the inductor ripple current as a percentage of the
maximum load current. Keep LIR between 20% and
40% for best compromise of cost, size, and perfor-
mance. The peak inductor current is approximately:
Input Capacitor
A 4.7μF ceramic input capacitor is recommended for
most applications because of its low equivalent series
resistance (ESR), equivalent series inductance (ESL),
and cost. To ensure stability over a wide temperature
range, an X5R or X7R dielectric is recommended.
The input capacitor reduces peak currents drawn from
the power source and reduces noise and voltage ripple
on the input caused by the circuit
’
s switching. The input
capacitor must meet the ripple current requirement
(I
RMS
) imposed by the switching currents defined by
the following equation:
Choose a capacitor that exhibits less than 10
°
C tem-
perature rise at the maximum operating RMS current for
optimum long-term reliability.
Output Capacitor
A 4.7μF ceramic output capacitor is recommended for
most applications because of its low ESR, ESL, and
lower cost. To ensure stability over a wide temperature
range, an X5R or X7R dielectric is recommended.
Key selection parameters for a ceramic output capacitor
are capacitance, ESR, and voltage rating. These affect
the overall stability, output ripple voltage, and transient
I
I
V
V
V
V
RMS
OUT
IN
OUT
IN
OUT
=
(
)
I
LIR
2
I
L PEAK
(
OUT MAX
(
)
)
=
+
×
1
Smallest 1A, 1.4MHz Step-Down Regulators
12
______________________________________________________________________________________
MAX1973
IN
COMP
FBSEL
SS
GND
LX
FB
CTL1
CTL2
PGND
3.3
μ
H
1.8V
4.7
μ
F
0.1
μ
F
470pF
36k
4.7
μ
F
V
IN
= 2.6V TO 5.5V
Figure 2. MAX1973 with 1.8V Preset Output
MAX1974
IN
COMP
FBSEL
SS
GND
LX
FB
POK
ON
PGND
3.3
μ
H
1.5V
4.7
μ
F
0.1
μ
F
330pF
43k
4.7
μ
F
V
IN
= 2.6V TO 5.5V
POK
100k
IN
IN
Figure 3. MAX1974 with Preset 1.5V Output
MAX1973
IN
COMP
FBSEL
SS
GND
LX
FB
CTL1
CTL2
PGND
3.3
μ
H
1.25V TO V
IN
4.7
μ
F
0.1
μ
F
C
C
R
C
4.7
μ
F
V
IN
= 2.6V TO 5.5V
R1
R2
Figure 4. MAX1973 with Adjustable Output Voltage Set by R1
and R2
MAX1974
IN
COMP
FBSEL
SS
GND
LX
FB
ON
POK
PGND
3.3
μ
H
0.75V TO V
IN
4.7
μ
F
0.1
μ
F
C
C
R
C
4.7
μ
F
V
IN
= 2.6V TO 5.5V
R1
R2
IN
IN
100k
POK
Figure 5. MAX1974 with Adjustable Output Voltage Set by R1
and R2
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1974EUB+ | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1A 1.4MHz Step-Down Regulator 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 |
| MAX1974EUB+T | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1A 1.4MHz Step-Down Regulator 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 |
| MAX1974EUB-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 |
| MAX1974EUB-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 |
| MAX1974EUB-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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