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參數(shù)資料
| 型號： | MCP1601 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 500 mA Synchronous BUCK Regulator |
| 中文描述： | 500毫安同步降壓穩(wěn)壓器 |
| 文件頁數(shù)： | 11/22頁 |
| 文件大?。?/td> | 585K |
| 代理商： | MCP1601 |
2003 Microchip Technology Inc.
DS21762A-page 11
MCP1601
4.2
Cross-Conduction Timing
Proper timing between turning on the P-Channel, high-
side MOSFET and turning off the N-Channel, low-side
MOSFET (and vice versa) is critical to obtaining high
efficiency. This delay between transitions is what limits
the maximum duty cycle obtainable by the MCP1601.
The delay between transitions leads to more time when
the external inductor current is freewheeling through
the internal N-Channel body diode and leads to a
decrease in efficiency. If the timing delay is too short
and both the internal P-Channel MOSFET and N-
Channel MOSFET conduct, high peak currents will be
observed shooting through the device. This will also
reduce the operating efficiency. The MCP1601 inset
timing is integrated to optimize efficiency for the entire
line and load operating range of the device.
4.3
Integrated Protection Features
4.3.1
SHUTDOWN
By placing a logic low on the SHDN pin of the
MCP1601, the device will enter a low quiescent current
shutdown mode. This feature turns off all of the internal
bias and drivers within the MCP1601 in an effort to min-
imize the quiescent current. This feature is popular for
battery-operated, portable power applications. The
shutdown low quiescent current is typically 1 μ
A.
4.3.2
INTERNAL OSCILLATOR AND
SYNCHRONIZATION CAPABILITY
The internal oscillator is completely integrated and
requires no external components. The frequency is set
nominally to 750 kHZ in an effort to minimize the exter-
nal inductor and capacitor size needed for the BUCK
topology. In addition to the internal 750 kHz oscillator,
the MCP1601 is capable of being synchronized to an
external oscillator. The external oscillator frequency
must be greater than 850 kHz and less than 1 MHz. For
proper synchronization, the duty cycle of the external
synchronization clock must be between 10% and 90%.
The minimum low voltage level should be below 15% of
V
IN
and the high level of the clock should be above
45% of V
IN
. Rise and fall time requirements for the
external synchronization clock must be faster than
100 ns from 10% to 90%. When synchronizing to an
external clock, the MCP1601 will always operate in the
PWM mode in an effort to eliminate multiple switching
frequency
’
s and their harmonics.
4.3.3
INTERNAL SOFT START
The MCP1601 completely integrates the soft start func-
tion and requires no external components. The soft
start time is typically 0.5 ms and is reset during over-
current and over-temperature shutdown.
4.3.4
OVER-TEMPERATURE
PROTECTION
The MCP1601 protects the internal circuitry from over-
temperature conditions by sensing the internal device
temperature and shutting down when it reaches
approximately 160
°
C. The device will shut down, the
temperature will cool to approximately 150
°
C, soft start
will be enabled and normal operation will resume with
no external circuit intervention.
4.3.5
UNDER-VOLTAGE LOCKOUT
Protection from operating at sustained input voltages
that are out of range is prevented with the integrated
Under-Voltage Lockout feature. When the input voltage
dips below 2.5V (typically), the MCP1601 will shutdown
and the soft start circuit will be reset. Normal operation
will resume when the input voltage is elevated above
2.7V, maximum. This hysteresis is provided to prevent
the device from starting with too low of an input voltage.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MCP1601_13 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:500 mA Synchronous BUCK Regulator |
| MCP1601EV | 功能描述:電源管理IC開發(fā)工具 MCP1601 Buck Reg Eval Brd RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| MCP1601-I/MS | 功能描述:開關變換器、穩(wěn)壓器與控制器 500mA Sych Buck RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| MCP1601-I/MS | 制造商:Microchip Technology Inc 功能描述:BUCK CONVERTER SMD 1601 MSOP8 |
| MCP1601T-I/MS | 功能描述:開關變換器、穩(wěn)壓器與控制器 500mA Sych Buck RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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