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| 型号： | MCP1603EV |
| 厂商： | Microchip Technology |
| 文件页数： | 14/26页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL BUCK CONV MCP1603 |
| 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： | 0.8V，1.2V，1.8V，2.5V，和 3.3V |
| 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： | 2MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MCP1603 |
| 产品目录页面： | 664 (CN2011-ZH PDF) |
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MCP1603
5.0
5.1
APPLICATION INFORMATION
Typical Applications
For adjustable output applications, an additional R-C
compensation network is necessary for control loop
stability. Recommended values for any output voltage
are:
The MCP1603 500 mA synchronous buck regulator
operates over a wide input voltage range (2.7V to 5.5V)
and is ideal for single-cell Li-Ion battery powered
R COMP
C COMP
=
=
4.99 k Ω
33 pF
applications, USB powered applications, three cell
NiMH or NiCd applications and 3V or 5V regulated
input applications. The 5-lead TSOT and 8-lead 2x3
Refer to Figure 6-2 for proper placement of R COMP and
C COMP .
DFN packages provide a small footprint with minimal
external components.
5.4
Input Capacitor Selection
The input current to a buck converter, when operating
5.2 Fixed Output Voltage Applications
in an application used to convert three NiMH batteries
into a well regulated 1.8V @ 500 mA output. A 4.7 μF
input capacitor, 4.7 μF output capacitor, and a 4.7 μH
inductor make up the entire external component solu-
tion for this application. No external voltage divider or
compensation is necessary. In addition to the fixed
1.8V option, the MCP1603 is also available in 1.2V,
1.5V, 2.5V, or 3.3V fixed voltage options.
in continuous conduction mode, is a squarewave with
a duty cycle defined by the output voltage (V OUT ) to
input voltage (V IN ) relationship of V OUT /V IN . To prevent
undesirable input voltage transients, the input capacitor
should be a low ESR type with an RMS current rating
given by Equation 5.5 . Because of their small size and
low ESR, ceramic capacitors are often used. Ceramic
material X5R or X7R are well suited since they have a
low temperature coefficient and acceptable ESR.
EQUATION 5-2:
? V OUT × ( V IN – V OUT ) ?
I CIN , RMS = I OUT , MAX × ? ------------------------------------------------------ ?
5.3
Adjustable Output Voltage
Applications
? V IN ?
When the desired output for a particular application is
not covered by the fixed voltage options, an adjustable
capacitor value.
shows an adjustable MCP1603 being used to convert a
5V rail to 1.0V @ 500 mA. The output voltage is adjust-
5.5
Output Capacitor Selection
R BOT = R TOP × ? ----------------------------- ?
able by using two external resistors as a voltage
divider. For adjustable-output voltages, it is
recommended that the top resistor divider value be
200 k Ω . The bottom resistor value can be calculated
using the following equation:
EQUATION 5-1:
V FB
? V OUT – V FB ?
Example:
The output capacitor helps provide a stable output
voltage during sudden load transients, smooths the
current that flows from the inductor to the load, and
reduces the output voltage ripple. Therefore, low ESR
capacitors are a desirable choice for the output capac-
itor. As with the input capacitor, X5R and X7R ceramic
capacitors are well suited for this application.
The output ripple voltage is often a design specifica-
tion. A buck converters’ output ripple voltage is a
function of the charging and discharging of the output
capacitor and the ESR of the capacitor. This ripple
Δ V OUT = Δ I L × ESR + ---------------------
R TOP
V OUT
V FB
R BOT
R BOT
=
=
=
=
=
200 k Ω
1.0V
0.8V
200 k Ω x (0.8V/(1.0V - 0.8V))
800 k Ω
(Standard Value = 787 k Ω )
EQUATION 5-3:
Δ I L
8 × f × C
DS22042A-page 14
? 2007 Microchip Technology Inc.
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相关代理商/技术参数 |
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|---|---|
| MCP1603L | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:2.0 MHz, 500 mA Synchronous Buck Regulator |
| MCP1603L-080I/OS | 制造商:Microchip Technology Inc 功能描述:2.0MHZ, 0.5A, SYNCH-BUCK PFM/PWM REG - Rail/Tube |
| MCP1603L-120I/MC | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:2.0 MHz, 500 mA Synchronous Buck Regulator |
| MCP1603L-120I/OS | 制造商:Microchip Technology Inc 功能描述:CONV DC-DC SGL-OUT STEP DOWN 5PIN TSOT - Rail/Tube |
| MCP1603L-150I/MC | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:2.0 MHz, 500 mA Synchronous Buck Regulator |
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