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參數(shù)資料
| 型號： | MAX1644 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Advanced Chemistry-Independent, Level 2 Battery Charger with Input Current Limiting |
| 中文描述： | 2A、低電壓、降壓型穩(wěn)壓器，內(nèi)置同步整流與開關(guān) |
| 文件頁數(shù)： | 24/32頁 |
| 文件大?。?/td> | 183K |
| 代理商： | MAX1644 |
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M
Advanc ed Chemistry-Independent, Level 2
Battery Charger with Input Current Limiting
24
______________________________________________________________________________________
Charger T imeout
The MAX1645 includes a timer that terminates charge if
the charger has not received a ChargingVoltage() or
ChargingCurrent() command in 175sec. During charg-
ing, the timer is reset each time a ChargingVoltage() or
ChargingCurrent() command is received; this ensures
that the charging cycle is not terminated.
If timeout occurs, charging will terminate and both
ChargingVoltage() and ChargingCurrent() commands
are required to restart charging. A power-on reset will
also restart charging at 128mA.
DC-to-DC Converter
The MAX1645 employs a buck regulator with a boot-
strapped NMOS high-side switch and a low-side NMOS
synchronous rectifier.
DC-DC Controller
The control scheme is a constant off-time, variable fre-
quency, cycle-by-cycle current mode. The off-time is
constant for a given BATT voltage; it varies with V
BATT
to keep the ripple current constant. During low-dropout
operation, a maximum on-time of 10ms allows the con-
troller to achieve >99% duty cycle with continuous con-
duction. Figure 8 shows the controller functional
diagram.
MOSFET Drivers
The low-side driver output DLO swings from 0V to
DLOV. DLOV is usually connected through a filter to
LDO. The high-side driver output DHI is bootstrapped
off LX and swings from V
LX
to V
BST
. When the low-side
16.800V
18.432V
V
= 4.096V
VDCIN > 20V
0
1.024V
0
0x0400
0x20Dx
0x41A0
0x313x
0x4800
0x106x
4.192V
12.592V
ChargingVoltage() D15–D0 DATA
8.400V
0xFFFF
Figure 7. ChargingVoltage() Code to Voltage Mapping
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1644EAE | 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(fēng)格:SMD/SMT |
| MAX1644EAE/GH9 | 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(fēng)格:SMD/SMT |
| MAX1644EAE/GH9-T | 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(fēng)格:SMD/SMT |
| MAX1644EAE+ | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 2A Step-Dow w/Synch Rectification 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(fēng)格:SMD/SMT |
| MAX1644EAE+T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 2A Step-Dow w/Synch Rectification 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(fēng)格:SMD/SMT |
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