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| 型号： | MCP16301T-I/CHY |
| 厂商： | Microchip Technology |
| 文件页数： | 11/38页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 0.6A SOT23-6 |
| 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： | 2 V ~ 15 V |
| 输入电压： | 4 V ~ 30 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 包装： | 标准包装 |
| 供应商设备封装： | SOT-23-6 |
| 其它名称： | MCP16301T-I/CHYDKR |
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MCP16301
4.0
DETAILED DESCRIPTION
4.1.4
ENABLE INPUT
4.1
Device Overview
Enable input, (EN), is used to enable and disable the
device. If disabled, the MCP16301 device consumes a
The MCP16301 is a high input voltage step-down
regulator, capable of supplying 600 mA to a regulated
output voltage from 2.0V to 15V. Internally, the trimmed
500 kHz oscillator provides a fixed frequency, while the
Peak Current Mode Control architecture varies the duty
cycle for output voltage regulation. An internal floating
driver is used to turn the high side integrated
N-Channel MOSFET on and off. The power for this
driver is derived from an external boost capacitor
minimal current from the input. Once enabled, the
internal soft start controls the output voltage rate of rise,
preventing high-inrush current and output voltage
overshoot.
4.1.5 SOFT START
The internal reference voltage rate of rise is controlled
during startup, minimizing the output voltage overshoot
and the inrush current.
whose energy is supplied from a fixed voltage ranging
between 3.0V and 5.5V, typically the input or output
4.1.6
UNDER VOLTAGE LOCKOUT
voltage of the converter. For applications with an output
voltage outside of this range, 12V for example, the
boost capacitor bias can be derived from the output
using a simple Zener diode regulator.
An integrated Under Voltage Lockout (UVLO) prevents
the converter from starting until the input voltage is high
enough for normal operation. The converter will typi-
cally start at 3.5V and operate down to 3.0V. Hysteresis
is added to prevent starting and stopping during
4.1.1
INTERNAL REFERENCE VOLTAGE
startup, as a result of loading the input voltage source.
V REF
An integrated precise 0.8V reference combined with an
external resistor divider sets the desired converter out-
4.1.7
OVERTEMPERATURE
PROTECTION
put voltage. The resistor divider range can vary without
affecting the control system gain. High-value resistors
consume less current, but are more susceptible to
noise.
Overtemperature protection limits the silicon die
temperature to 150°C by turning the converter off. The
normal switching resumes at 120°C.
4.1.2
INTERNAL COMPENSATION
All control system components necessary for stable
operation over the entire device operating range are
integrated, including the error amplifier and inductor
current slope compensation. To add the proper amount
of slope compensation, the inductor value changes
along with the output voltage (see Table 5-1 ).
4.1.3
EXTERNAL COMPONENTS
External components consist of:
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input capacitor
output filter (Inductor and Capacitor)
freewheeling diode
boost capacitor
boost blocking diode
resistor divider.
The selection of the external inductor, output capacitor,
input capacitor and freewheeling diode is dependent
upon the output voltage and the maximum output
current.
? 2011 Microchip Technology Inc.
DS25004A-page 11
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