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參數(shù)資料
| 型號： | MAX1774EEI |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Dual, High-Efficiency, Step-Down Converter with Backup Battery Switchover |
| 中文描述： | 3 A SWITCHING CONTROLLER, 1250 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | 0.150 INCH, 0.025 INCH PITCH, QSOP-28 |
| 文件頁數(shù)： | 17/21頁 |
| 文件大?。?/td> | 398K |
| 代理商： | MAX1774EEI |
M
Dual, High-Effic ienc y, S tep-Down
Converter with Bac kup Battery S witc hover
______________________________________________________________________________________
17
voltage-divider to FBC (Figure 1). Resistor values can
be calculated with the following equation:
R8 = R9
[(V
OUTC
/ V
FBC
) - 1]
where V
FBC
= +1.0V. Choose R9 to be 30k
or less.
S etting the Current Limit
The main regulator current limit is set externally through
a small current-sense resistor, R
CS
(Figure 1). The
value of R
CS
can be calculated with the following equa-
tion:
R
CS
= V
CLM
/(1.3
I
OUT
)
where V
CLM
= 80mV is the current-sense threshold,
and I
OUT
is the current delivered to the output. The
core and backup converter current limits are set inter-
nally and cannot be modified.
Careful layout of the current-sense signal traces is
imperative. Place R
CS
as close to the MAX1774 as pos-
sible. The two traces should have matching length and
width, be as far as possible from noisy switching sig-
PGNDC
FBC
LXC
INC
FBM
CS-
CS+
PGND
ACI
PDRV
NDRV
CVH
MAIN
C5
1
μ
F
P2
N1
L1
5
μ
H
C
MAIN
47
F
C6
10
μ
F
R
CS
CORE
C
CORE
22
F
R10
R11
R8
R9
L2
5.4
μ
H
C7
1
μ
F
R5
1M
R6
1M
R7
1M
GND
REF
CVL
LXB
BIN
IN
DBI
LBI
BACKUP
BATTERY
MAIN
BATTERY
V
IN_AC
R1
C1
10
μ
F
C2
10
μ
F
C4
0.22
μ
F
C3
1
μ
F
D2
L3
22
μ
H
P1
R4
R2
R3
D1
BKOFF
BKUP
LBO
ACO
SHDNC
SHDNM
MDRV
MAX1774
ON
OFF
ON
OFF
INS
NDS356AP
NSD03A10
2.7V
TO
20V
EP05
Q03L
LXB2 (QFN ONLY)
0.9V
TO
5.5V
1.0V
TO
5.5V
2.6V
TO
5.5V
FDS8928A
2.7V TO28V
1M
Figure 4. Typical Application Circuit (Cascaded)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1774EEI+ | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Dual Step-Down w/Switchover RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(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 |
| MAX1774EEI+T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Dual Step-Down w/Switchover RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(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 |
| MAX1774EEI-T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(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 |
| MAX1774EGJ | 制造商:Maxim Integrated Products 功能描述: |
| MAX1774EMJ | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(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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