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參數(shù)資料
| 型號(hào)： | MAX1775EEE |
| 廠(chǎng)商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | 32-Bit Digital Signal Controller with ROM 100-LQFP -40 to 125 |
| 中文描述： | 1 A DUAL SWITCHING CONTROLLER, 1250 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.150 INCH, 0.025 INCH PITCH, MO-137AA, QSOP-16 |
| 文件頁(yè)數(shù)： | 13/15頁(yè) |
| 文件大?。?/td> | 290K |
| 代理商： | MAX1775EEE |
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M
Dual-Output Step-Down
DC-DC Converter for PDA/Palmtop Computers
______________________________________________________________________________________
13
Design Procedure
Low-Voltage Configuration
To improve efficiency and conserve board space, the
core regulator operates from low input voltages, taking
advantage of internal low-voltage, low-on-resistance
MOSFETs. When the input voltage remains below 5.5V,
run the core converter directly from the input by con-
necting INC to IN (Figure 1). This configuration takes
advantage of the core
’
s low-voltage design and
improves efficiency.
High-Voltage Configuration
For input voltages greater than 5.5V, cascade the main
and core converters by connecting INC to the main out-
put voltage. In this configuration (Figure 4), the core
converter is powered from the main output. Ensure that
the main output can simultaneously supply its load and
the core input current. In this configuration, the main
output voltage must be set above the 2.6V minimum
input voltage of the core converter.
Setting the Output Voltages
The main output voltage may be set from +2.6V and
+5.5V with two external resistors connected as a volt-
age-divider to FBM (Figure 1). Resistor values can be
calculated by the following equation:
R2 = R3
[(V
OUTM
/ V
FBM
) - 1]
where V
FBM
= +1.25V. Choose R3 to be 40k
or less.
The core regulator output is adjustable from +1.0V to
+5.0V through two external resistors connected as a
voltage-divider to FBC (Figure 1). Resistor values can
be calculated through the following equation:
R4 = R5
[(V
OUTC
/ V
FBC
) - 1]
where V
FBC
= +1.0V. Choose R5 to be 30k
or less.
Setting the Current Limit
The main regulator current limit is set externally through
a small current-sense resistor, R1 (Figure 1). The value
of R1 can be calculated by the following equation:
V
1
1 3
(
where V
CLM
= 80mV is the current-sense threshold,
and I
OUT
is the current delivered to the output. The
core converter current limit is set internally and cannot
be modified.
R
I
CLM
OUT
=
)
.
SHDNM
IN
IN 2.7V TO 28V
CVH
M1
M2
C4
47
μ
F
R1
33m
R2
R3
R4
R5
CORE
1.8V
1.5A
SHDNC
ON
ON
OFF
OFF
NDRV
CS+
CS-
INC
FBM
LXC
FBC
CVL
REF
PGND
GND
PDRV
C5
22
μ
F
MAIN
3.3V
2A
C2
1
μ
F
C3
0.22
μ
F
L
C
5.4
μ
H
C1
1
μ
F
C6
10
μ
F
6
1
2
5
9
3
14
13
16
10
15
12
11
4
7
8
L
M
10
μ
H
MAX1775
Figure 4. High Input Voltage Cascaded Configuration
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1775EEE+ | 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 Dual-Out Step-Down for PDA/Palmtop RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| MAX1775EEE+T | 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 Dual-Out Step-Down for PDA/Palmtop RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| MAX1775EEE-T | 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 Dual-Out Step-Down for PDA/Palmtop RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| MAX1775EEE-TG069 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1775EVKIT | 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 Evaluation Kit for the MAX1775 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
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