參數(shù)資料
型號(hào)： MAX640CPA
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 穩(wěn)壓器
英文描述： 700-mW Mono, Differential Input, Class-AB Audio Amplifier with Active Low Shutdown 8-SOIC -40 to 85
中文描述： 1 A SWITCHING REGULATOR, PDIP8
封裝： PLASTIC, DIP-8
文件頁(yè)數(shù)： 9/12頁(yè)
文件大小： 166K
代理商： MAX640CPA
Low-Battery Detec tor
The low-battery detector compares the voltage on the
LBI input with the internal 1.28V reference. LBO goes
low whenever the input voltage at LBI is less than
1.28V. Set the low-battery detection voltage with resis-
tors R1 and R2 (Figure 3) as determined by the follow-
ing formula:
R1 = R2 [(VLB / LBI Threshold) - 1]
where R2 is any resistance in the 10k
to 1M
range
(typically 100k
), the LBI threshold is typically 1.28V,
and VLB is the desired low-battery detection voltage.
The low-battery comparator remains active in shutdown
mode.
S hutdown Mode
Bringing
SHDN
below 0.8V places the MAX639/
MAX640/MAX643 in shutdown mode. LX becomes high
impedance, and the voltage at VOUT falls to zero. The
time required for the output to rise to its nominal regu-
lated voltage when brought out of shutdown (start-up
time) depends on the inductor value, input voltage, and
load current (see the Start-Up Time vs. Output Current
graph in the Typical Operating Characteristics). The
low-battery comparator remains active in shutdown
mode.
__________Applic ations Information
Induc tor S elec tion
When selecting an inductor, consider these four factors:
peak-current rating, inductance value, series resistance,
and size. It is important not to exceed the inductor’s
peak-current rating. A saturated inductor will pull exces-
sive currents through the MAX639/MAX640/MAX653’s
switch, and may cause damage. Avoid using RF chokes
or air-core inductors since they have very low peak-cur-
rent ratings. Electromagnetic interference must not upset
nearby circuitry or the regulator IC. Ferrite-bobbin types
work well for most digital circuits; toroids or pot cores
work well for EMI-sensitive analog circuits.
Recall that the inductance value determines I
PEAK
for all
input voltages (Equation 3). If there are no resistive loss-
es and the diode is ideal, the maximum average current
that can be drawn from the MAX639/MAX640/MAX653
will be one-half I
PEAK
. With the real losses in the switch,
inductor, and diode taken into account, the real maxi-
mum output current typically varies from 90% to 50% of
the ideal. The following steps describe a conservative
way to pick an appropriate inductor.
Step 1:
Decide on the maximum required output
current, in amperes: I
OUTMAX
.
Step 2:
I
PEAK
= 4 x I
OUTMAX
.
M
5V /3.3V /3V /Adjustable, High-Effic ienc y,
Low I
Q
, S tep-Down DC-DC Converters
_______________________________________________________________________________________
9
Table 1. Component Suppliers
MAXL001*
7300-13**
7300-15**
7300-17**
7300-19**
7300-21**
7300-25**
0.65 x 0.33 dia.
0.63 x 0.26 dia.
0.63 x 0.26 dia.
0.63 x 0.26 dia.
0.63 x 0.26 dia.
0.63 x 0.26 dia.
0.63 x 0.26 dia.
100
100
150
220
330
470
1000
1.75
0.89
0.72
0.58
0.47
0.39
0.27
PART
NUMBER
CD54
CD54
CDR74
CDR74
CDR105
CDR105
Sumida Electric (USA)
637 East Golf Road
Arlington Heights, IL 60005
(708) 956-0666
SIZE
(mm)
VALUE
(μH)
100
220
100
220
100
220
I
MAX
(A)
0.52
0.35
0.52
0.35
0.80
0.54
5.2 x 5.8 x 4.5
5.2 x 5.8 x 4.5
7.1 x 7.7 x 4.5
7.1 x 7.7 x 4.5
9.2 x 10.0 x 5.0
9.2 x 10.0 x 5.0
PART
NUMBER
MAXC001*
267 Series**
267 Series**
SIZE
(inches)
0.49 x 0.394 dia.
VALUE
(μF)
150
47
100
ESR
(
)
0.2
0.2
0.2
D SM packages
E SM packages
PART
NUMBER
SE014
SE024
Collmer Semiconductor
14368 Proton Road
Dallas, TX 75244
(214) 233-1589
NOTE:
This list does not constitute an endorsement by Maxim
Integrated Products and is not intended to be a comprehensive
list of all manufacturers of these components.
SIZE
V
F
(V)
0.55
0.55
SOT89
SOT89
INDUCTORS — THROUGH HOLE
SIZE
(inches)
0.2
0.27
0.36
0.45
0.58
0.86
2.00
INDUCTORS — SURFACE MOUNT
SERIES R
(
)
0.63
1.50
0.51
0.98
0.35
0.69
CAPACITORS — LOW ESR
V
MAX
(V)
35
10
6.3
* Maxim Integrated Products
**Matsuo Electronics
2134 Main Street
Huntington Beach, CA 92648
(714) 969-2491
SCHOTTKY DIODES — SURFACE MOUNT
I
MAX
(A)
1
0.95
PART
NUMBER
VALUE
(μH)
I
MAX
(A)
SERIES R
(
)
* Maxim Integrated Products
**Caddell-Burns
258 East Second Street
Mineola, NY 11501-3508
(516) 746-2310
相關(guān)PDF資料
PDF描述
MAX640CSA 700-mW Mono, Differential Input, Class-AB Audio Amplifier with Active Low Shutdown 8-MSOP-PowerPAD -40 to 85
MAX640EPA 700-mW Mono, Differential Input, Class-AB Audio Amplifier with Active Low Shutdown 8-MSOP-PowerPAD -40 to 85
MAX653CPA 5V/3.3V/3V/Adjustable, High-Efficiency, Low IQ, Step-Down DC-DC Converters
MAX653CSA 8-Bit Shift Register 20-PDIP -40 to 125
MAX653EPA 8-Bit Shift Register 24-SOIC -40 to 125
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX640CPA+ 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 5V/3.3V/3V Adj Low-IQ Step-Down 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
MAX640CSA 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 5V/3.3V/3V Adj Low-IQ Step-Down 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
MAX640CSA+ 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 5V/3.3V/3V Adj Low-IQ Step-Down 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
MAX640CSA+T 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 5V/3.3V/3V Adj Low-IQ Step-Down 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
MAX640CSA-T 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 5V/3.3V/3V Adj Low-IQ Step-Down 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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