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| 型号： | MCP1602-120I/MF |
| 厂商： | Microchip Technology |
| 文件页数： | 14/26页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 1.2V 0.5A 8DFN |
| 标准包装： | 120 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 1.2V |
| 输入电压： | 2.7 V ~ 5.5 V |
| 频率 - 开关： | 2MHz |
| 电流 - 输出： | 500mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-VDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 8-DFN-EP（3x3） |
| 产品目录页面： | 668 (CN2011-ZH PDF) |
MCP1602
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 MCP1602 synchronous buck regulator with power-
good operates over a wide input voltage range
(2.7V to 5.5V) and is ideal for single-cell Li-Ion battery
powered applications, USB powered applications,
three cell NiMH or NiCd applications and 3V to 5V
regulated input applications.
R COMP = 4.99 k Ω
C COMP = 33 pF
Refer to Figure 6-2 for proper placement of R COMP and
C COMP .
5.2
Fixed Output Voltage Applications
5.4 Input Capacitor Selection
The input current to a buck converter, when operating
? V OUT × ( V IN – V OUT ) ?
I CIN , RMS = I OUT , MAX × ? ------------------------------------------------------ ?
The Typical Application Circuit shows a fixed
MCP1602 in a typical application used to convert three
NiMH batteries into a well regulated 1.5V @ 500 mA
output. A 4.7 μF input and output capacitor, a 4.7 μH
inductor, and a small RC filter make up the entire
external component selection for this application. No
external voltage divider or compensation is necessary.
In addition to the fixed 1.5V option, the MCP1602 is
also available in 1.2V, 1.8V, 2.5V, or 3.3V fixed voltage
options.
5.3 Adjustable Output Voltage
Applications
When the desired output for a particular application is
not covered by the fixed voltage options, an adjustable
shows an adjustable MCP1602 being used to convert a
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 a RMS current rating
given by Equation 5-2 . 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 IN ?
capacitor value.
5V rail to 1.0V @ 500 mA. The output voltage is adjust-
able by using two external resistors as a voltage
5.5
Output Capacitor Selection
R BOT = R TOP × ? ----------------------------- ?
divider. For adjustable output voltages, it is recom-
mended 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 it
also reduces the output voltage ripple. Therefore, low
ESR capacitors are a desirable choice for the output
capacitor. 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
Δ I L
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 )
capacitor and the ESR of the capacitor. This ripple
EQUATION 5-3:
8 × f × C
DS22061A-page 14
? 2007 Microchip Technology Inc.
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| MCP1602-250I/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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