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| 型号： | MCP1601EV |
| 厂商： | Microchip Technology |
| 文件页数： | 12/22页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR MCP1601 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.8V，2.05V，2.45V ~ 3.28V |
| 电流 - 输出： | 500mA |
| 输入电压： | 2.7 ~ 5.5 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 750kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MCP1601 |
| 产品目录页面： | 664 (CN2011-ZH PDF) |
| 相关产品： | MCP1601-I/MS-ND - IC REG BUCK SYNC ADJ 0.5A 8MSOP MCP1601T-I/MS-ND - IC REG BUCK SYNC ADJ 0.5A 8MSOP |
MCP1601
5.0
APPLICATIONS INFORMATION
MCP1601 Application Circuit
L Range
V OUT Range
MCP1601
1 V IN
L X 8
10 μH to 22 μH
10 μH
1.2V to 3.3V
I OUT = 0 mA to 400 mA
Input
Voltage
2.7V-4.2V
C IN
10 μF
2 SHDN
3 FB
4 A GND
P GND 7
V OUT 6
SYNC/ 5
PWM
C OUT
10 μF
C OUT Range
10 μF to 47 μF
1 M ?
For V OUT < 1.2V ONLY
C 1
47 pF
R 1
250 k ?
(for 1.8V)
R 2
200 k ?
FIGURE 5-1:
Typical Application Circuit.
5.1
Setting Output Voltage
5.1.1
LEAD CAPACITOR
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
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.
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
5.2
5.2.1
Choosing External Components
CAPACITORS
output voltage is shown below.
EQUATION
R1 = R2 × [ ( VOUT ? V FB ) – 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
Example:
Desired V OUT = 2.5V
V FB = 0.8V
R 2 = 200 k ?
R 1 = 425 k ?
DS21762A-page 12
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.
? 2003 Microchip Technology Inc.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MCP1601-I/MS | 功能描述:开关变换器、稳压器与控制器 500mA Sych Buck RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装: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:开关变换器、稳压器与控制器 500mA Sych Buck RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| MCP1602 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:2.0 MHz, 500 mA Synchronous Buck Regulator with Power-Good |
| MCP1602-080I/MF | 功能描述:开关变换器、稳压器与控制器 20MHz 05A Synch-Buck PFM/PWM Reg RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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