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| 型号： | MCP1603T-ADJI/OS |
| 厂商： | Microchip Technology |
| 文件页数： | 14/26页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ TSOT23-5 |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 4.5 V |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 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： | SOT-23-5 细型，TSOT-23-5 |
| 包装： | 标准包装 |
| 供应商设备封装： | TSOT-23-5 |
| 产品目录页面： | 668 (CN2011-ZH PDF) |
| 配用： | MCP1603RD-TNY-ND - REFERENCE DESIGN FOR MCP1603 MCP1603EV-ND - BOARD EVAL BUCK CONV MCP1603 |
| 其它名称： | MCP1603T-ADJI/OSDKR |
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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| MCP1604-080I/MF | 功能描述:开关变换器、稳压器与控制器 20MHz 12A 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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| MCP1604-120I/MF | 功能描述:开关变换器、稳压器与控制器 20MHz 12A 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 |
| MCP1604-120I/UN | 功能描述:开关变换器、稳压器与控制器 20MHz 12A 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 |
| MCP1604-150I/MF | 功能描述:开关变换器、稳压器与控制器 20MHz 12A 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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