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參數(shù)資料
| 型號： | MCP1601 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 500 mA Synchronous BUCK Regulator |
| 中文描述： | 500毫安同步降壓穩(wěn)壓器 |
| 文件頁數(shù)： | 12/22頁 |
| 文件大?。?/td> | 585K |
| 代理商： | MCP1601 |
MCP1601
DS21762A-page 12
2003 Microchip Technology Inc.
5.0
APPLICATIONS INFORMATION
FIGURE 5-1:
Typical Application Circuit.
5.1
Setting Output Voltage
The MCP1601 output voltage is set by using two exter-
nal resistors for output voltages
≥
1.2V. For output volt-
ages < 1.2V, a third 1 M
series resistor is necessary
to compensate the control system. A 200 k
resistor is
recommended for R
2
, the lower end of the voltage
divider. Using higher value resistors will make the cir-
cuit more susceptible to noise on the FB pin, causing
unstable operation. Lower value resistors can be used
down to 20 k
or below, if necessary.
The feedback reference voltage for the MCP1601 is
typically 0.8V. The equation used to calculate the
output voltage is shown below.
EQUATION
Example:
Desired V
OUT
= 2.5V
V
FB
= 0.8V
R
2
= 200 k
R
1
= 425 k
5.1.1
LEAD CAPACITOR
Capacitor C
1
is used for applications that utilize
ceramic output capacitors. To lower the PFM mode rip-
ple voltage, a 47 pf capacitor for C
1
is used to couple
the output AC ripple voltage to the internal PFM mode
comparator. For PWM mode, only applications that use
electrolytic capacitors that have 0.2
or greater of ESR
(Equivalent Series Resistance), C
1
is not necessary.
5.2
Choosing External Components
5.2.1
CAPACITORS
The MCP1601 was developed to take full advantage of
the latest ceramic capacitor technology, though electro-
lytic types can be used as well. When selecting the best
capacitor for the application, the capacitance, physical
size, ESR, temperature coefficient, ripple current rat-
ings (electrolytic) and cost are considered in making
the best choice.
When selecting ceramic capacitors for C
OUT
, the tem-
perature coefficient of the dielectric should be evalu-
ated. Two dielectrics are recommended as they are
stable over a wide temperature range (X5R and X7R).
Other dielectrics can be used, but their capacitance
should stay within the recommended range over the
entire operating temperature range.
1 M
For V
OUT
< 1.2V ONLY
V
OUT
SYNC/
PWM
P
GND
L
X
SHDN
V
IN
1
2
3
4
8
7
6
5
MCP1601
FB
A
GND
Input
Voltage
2.7V-4.2V
C
IN
10 μF
10 μH
C
OUT
10 μF
R
1
250 k
(for 1.8V)
R
2
200 k
MCP1601 Application Circuit
I
OUT
= 0 mA to 400 mA
C
OUT
Range
10 μF to 47 μF
L Range
10 μH to 22 μH
C
1
47 pF
V
OUT
Range
1.2V to 3.3V
R1
R2
VOUTVFB
(
)
1
–
[
]
×
=
Where: V
OUT
is the desired output voltage,
V
FB
is the MCP1601 internal feedback
reference voltage
R
1
is the resistor connected to V
OUT
in the voltage divider
R
2
is the resistor connected to ground
in the voltage divider
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MCP1601_13 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:500 mA Synchronous BUCK Regulator |
| MCP1601EV | 功能描述:電源管理IC開發(fā)工具 MCP1601 Buck Reg Eval Brd RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| MCP1601-I/MS | 功能描述:開關變換器、穩(wěn)壓器與控制器 500mA Sych Buck RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| MCP1601-I/MS | 制造商:Microchip Technology Inc 功能描述:BUCK CONVERTER SMD 1601 MSOP8 |
| MCP1601T-I/MS | 功能描述:開關變換器、穩(wěn)壓器與控制器 500mA Sych Buck RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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