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參數(shù)資料
| 型號(hào)： | MAX830-MAX833 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 5V/3.3V/3V/Adjustable-Output, 1A, Step-Down, PWM, Switch-Mode DC-DC Regulators |
| 中文描述： | 5V/3.3V/3V/Adjustable-Output，1A中，降壓，PWM，開關(guān)模式DC - DC穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 4/5頁(yè) |
| 文件大?。?/td> | 43K |
| 代理商： | MAX830-MAX833 |
5V/3.3V/3V/Adjustable-Output, 1A,
Step-Down, PWM, Switch-Mode DC-DC Regulators
4
_______________________________________________________________________________________
M
______________________________________________________________Pin Desc ription
PIN
FUNCTION
11
5, 7,
10, 12
1, 2,
3, 4
6
9
Shutdown is achieved by pulling SHUT low. Leave SHUT floating for normal operation.
__________Applic ations Information
Although the MAX830–MAX833 are high-efficiency
step-down voltage converters, certain precautions are
required to avoid excessive chip temperature (the
absolute maximum rating for this parameter, T
j
, is
+125°C). The 16-pin SO package has thermal resis-
tance of +55°C/W when mounted properly; this limits
continuous chip power dissipation to the 1W range.
When installing these chips:
1) Use wide and, if possible, thick copper traces to
connect the leads (especially the GND pins) to
reduce thermal resistance.
2) Bond the package firmly to the board or use a clip-
style heatsink. A very small drop of thermal paste
between the chip package and the copper ground
plane is also helpful.
3) Confirm that the range of device operation is such
that the chip temperature does not exceed the
allowed maximum of T
j
= +125°C. This can be
determined from Tables 1 and 2.
Tables 1 and 2 show numbers for maximum allowed
load current based on not exceeding the T
j
= +125°C
limit. If the input voltage range, ambient temperature,
and/or output voltage setting allow for an unsafe level
of load current, limit the load current to a safe value by
connecting the appropriate resistor from the I
LIM
pin to
GND. With no external resistor, the preset switch cur-
Error-amplifier output. A series RC network connected to this pin compensates the device. Output swing
is limited to about 5.8V in the positive direction and -0.7V in the negative direction. V
C
can also synchro-
nize the device to an external TTL clock in the 115kHz to 170kHz range.
Ground requires a short, low-noise connection to ensure good load regulation. The internal reference is referred
to GND, so errors at this pin are multiplied by the error amplifier. Use thick copper for low thermal resistance.
V
IN
supplies power to the internal circuitry and also connects to the collector of the internal power switch.
V
IN
must be bypassed with a low-ESR capacitor, typically 100μF.
Switch-current limit can be reduced by connecting an external resistor (R
) from I
to GND
(See Note 7 in Electrical Characteristics). Leave I
LIM
floating for maximum current limit.
NAME
V
C
GND
V
IN
I
LIM
SHUT
rent limit (typically 1.7A) will limit the load current to
about 1.3A. Table 1 shows safe operating load cur-
rents for the MAX830 for various values of input and
output voltage and at three different ambient tempera-
tures of T
A
= +25°C, +45°C, and +70°C, respectively.
Table 2 shows the same information, but for the fixed
output voltage MAX831, MAX832, and MAX833.
When consulting these tables, note that power surges
of less than 30sec need not be considered from a ther-
mal standpoint. It is important for proper regulation,
however, that a power surge not require a peak switch
current exceeding the 1.2A (min) switch current limit.
Also, the inductor’s current rating should exceed I
PEAK
.
For highest efficiency, the inductor series resistance
should be 0.4
or less. I
PEAK
and I
LOAD
are related by
the following formula:
[V
OUT
x (V
IN
- V
OUT
)]
I
PEAK
= I
LOAD
+ ——————————
V
IN
x L x 200,000
Example: MAX830 with V
IN
= 30V, V
OUT
= 15V,
I
LOAD
= 0.5A continuous, L = 100μH and
T
A
= +70°C:
I
PEAK
= 0.86A (which is below 1.2A (min)
preset switch current limit);
and from Table 1:
maximum I
LOAD
allowed = 0.8A continuous
(i.e., operation is safe).
SENSE
(MAX831/
2/3)
8
For the MAX831/MAX832/MAX833, SENSE input is the internal error amplifier’s input, and should be
directly connected to V
OUT
. SENSE also aids current limiting by reducing oscillator frequency when V
OUT
is low.
V
SW
13, 14,
15, 16
Internal power switch output (rated for 1A load current)
FB
(MAX830)
For the MAX830, the FB input is the internal error amplifier's input, and should be connected to the mid-
point of a potential divider between V
OUT
and GND (Figure 1). The output voltage, during regulation, will
be that value that forces 2.21V (V
REF
) at the FB pin.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX832CWE | 5V/3.3V/3V/Adjustable-Output, 1A, Step-Down, PWM, Switch-Mode DC-DC Regulators |
| MAX833 | 5V/3.3V/3V/Adjustable-Output, 1A, Step-Down, PWM, Switch-Mode DC-DC Regulators |
| MAX833CWE | 5V/3.3V/3V/Adjustable-Output, 1A, Step-Down, PWM, Switch-Mode DC-DC Regulators |
| MAX830CWE | 5V/3.3V/3V/Adjustable-Output, 1A, Step-Down, PWM, Switch-Mode DC-DC Regulators |
| MAX831 | Evaluation Kit for the MAX830/MAX831/MAX832/MAX833 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX831CWE | 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 |
| MAX831CWE+ | 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 |
| MAX831CWE+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 |
| MAX831CWE-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 |
| MAX831EVKIT-SO | 功能描述:電源管理IC開發(fā)工具 RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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