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參數(shù)資料
| 型號： | MAX1678 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 1-Cell to 2-Cell, Low-Noise, High-Efficiency, Step-Up DC-DC Converter |
| 中文描述： | 1節(jié)至2節(jié)電池、低噪聲、高效率、升壓型DC-DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 166K |
| 代理商： | MAX1678 |
M
1-Cell to 2-Cell, Low-Noise,
High-Effic ienc y, S tep-Up DC-DC Converter
_______________________________________________________________________________________
7
Detailed Desc ription
The MAX1678 consists of an internal 1
, N-channel
MOSFET power switch, a built-in synchronous rectifier
that acts as the catch diode, a reference, PFM control
circuitry, and an inductor damping switch (Figure 1).
The device is optimized for applications that are pow-
ered by 1 to 3-cell alkaline, NiMH, or NiCd batteries, or
a 1-cell lithium battery such as pagers, remote controls,
and battery-powered instruments. They are designed to
meet the specific demands of the operating states
characteristic of such systems:
1) Primary battery is good and load is active: In this
state the load draws tens of milliamperes and the
MAX1678 typically offers 80% to 90% efficiency.
2) Primary battery is good and load is sleeping: In this
state the load draws hundreds of microamperes and
the DC-DC converter IC draws very low quiescent
current. Many applications maintain the load in this
state most of the time.
3) Primary battery is dead and DC-DC converter is
shut down: In this state the load is sleeping or sup-
plied by the backup battery, and the MAX1678
draws 0.1μA current from the OUT pin.
4) Primary and backup battery dead: The DC-DC con-
verter can restart from this condition.
BATT
PFI
0.5REF
PFO
GND
OUT
REF
N
P
OUT
1.7V
FB
SHDN
LX
RFRDY
1.23V REF
REF
START-UP COMPARATOR
0.5REF
START-UP
OSCILLATOR
EN
DAMP
TON
CONTROL LOGIC
TOFF
PDRV
MAX1678
t
ON
= K/V
BATT
BACKUP t
OFF
TIMER
DAMPING
SWITCH
ZERO-CROSSING
DETECTION
NDRV
Figure 1. Functional Diagram
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1678ESA | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1678EUA | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| MAX1678EUA+ | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1-2 Cell Step-Up DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| MAX1678EUA+T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1-2 Cell Step-Up DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| MAX1678EUAT | 制造商:Maxim Integrated Products 功能描述: |
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