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| 型号： | MCP1602-120I/MF |
| 厂商： | Microchip Technology |
| 文件页数： | 12/26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
4.0
DETAILED DESCRIPTION
4.1
Device Overview
PFM-to-PWM mode transition is initiated for any of the
The MCP1602 is a synchronous buck regulator with a
power-good signal. The device operates in a Pulse
Frequency Modulation (PFM) mode or a Pulse Width
following conditions:
? Continuous device switching
? Output voltage has dropped out of regulation
Modulation (PWM) mode to maximize system
efficiency over the entire operating current range.
4.2.2
LIGHT LOAD, PFM MODE
Capable of operating from a 2.7V to 5.5V input voltage
source, the MCP1602 can deliver 500 mA of
continuous output current.
When using the MCP1602, the PCB area required for
a complete step-down converter is minimized since
both the main P-Channel MOSFET and the synchro-
nous N-Channel MOSFET are integrated. Also while in
PWM mode, the device switches at a constant
frequency of 2.0 MHz (typical) which allow for small fil-
tering components. Both fixed and adjustable output
voltage options are available. The fixed voltage options
(1.2V, 1.5V, 1.8V, 2.5V, 3.3V) do not require an external
voltage divider which further reduces the required
During light load conditions, the MCP1602 operates in
a PFM mode. When the MCP1602 enters this mode, it
begins to skip pulses to minimize unnecessary
quiescent current draw by reducing the number of
switching cycles per second. The typical quiescent
current draw for this device is 45 μA.
PWM-to-PFM mode transition is initiated for any of the
following conditions:
? Discontinuous inductor current is sensed for a set
duration
? Inductor peak current falls below the transition
threshold limit
circuit board footprint. The adjustable output voltage
options allow for more flexibility in the design, but
4.3
Power-Good (PG)
require an external voltage divider.
Additionally the device features undervoltage lockout
(UVLO), overtemperature shutdown, overcurrent
protection, and enable/disable control.
The open-drain power-good (PG) circuitry monitors the
regulated output voltage. A fixed delay time of
approximately 262 ms is generated once the output
voltage is above the power-good high threshold,
4.2
Synchronous Buck Regulator
V TH_H , (typically 94% of V OUT ). As the output voltage
falls below the power-good low threshold, V TH_L ,
The MCP1602 has two distinct modes of operation that
allow the device to maintain a high level of efficiency
throughout the entire operating current and voltage
range. The device automatically switches between
PWM mode and PFM mode depending upon the output
load requirements.
(typically 92% of V OUT ) the PG signal transitions to a
low state indicating that the output is out of regulation.
The PG circuitry has a typical 165 μs delay when
detecting a falling output voltage. This helps to
increase the noise immunity of the power-good output,
avoiding false triggering of the PG signal during line
and load transients.
4.2.1
FIXED FREQUENCY, PWM MODE
During heavy load conditions, the MCP1602 operates
V TH_H
at a high, fixed switching frequency of 2.0 MHz (typi-
cal). This minimizes output ripple (10 - 15 mV typically)
and noise while maintaining high efficiency (88% typi-
cal with V IN = 3.6V, V OUT = 1.8V, I OUT = 300 mA).
During normal PWM operation, the beginning of a
switching cycle occurs when the internal P-Channel
MOSFET is turned on. The ramping inductor current is
sensed and tied to one input of the internal high-speed
V OUT
t RPU
V TH_L
t RPD
comparator. The other input to the high-speed compar-
ator is the error amplifier output. This is the difference
PG
V OH
V OL
between the internal 0.8V reference and the sensed
output voltage. When the sensed current becomes
equal to the amplified error signal, the high-speed
comparator switches states and the P-Channel
MOSFET is turned off. The N-Channel MOSFET is
turned on until the internal oscillator sets an internal RS
latch initiating the beginning of another switching cycle.
DS22061A-page 12
FIGURE 4-1:
Power-Good Timing.
? 2007 Microchip Technology Inc.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MCP1602-150I/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 |
| MCP1602-150I/MS | 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 |
| MCP1602-180I/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 |
| MCP1602-180I/MS | 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 |
| 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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