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主要特征
应用/用途
Parametric specs for Battery Chargers
| Charging VIN (V) (max) | 26 |
| Cell Chemistry | Li-Ion Li-Polymer NiCd NiMH |
| # NiMH/ NiCd Cells | 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 |
| # Lithium Ion Cells | 1 2 3 4 5 6 |
| Protected VIN (V) (max) | 26 |
| Charger (V) | 2 to 24 |
| Oper. Temp. (°C) | -40 to +85 |
| Package/Pins | QSOP/16 |
| Budgetary Price (See Notes) | 3.39 |
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Technical Docs
参量
Parametric specs for Battery Chargers
| Charging VIN (V) (max) | 26 |
| Cell Chemistry | Li-Ion Li-Polymer NiCd NiMH |
| # NiMH/ NiCd Cells | 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 |
| # Lithium Ion Cells | 1 2 3 4 5 6 |
| Protected VIN (V) (max) | 26 |
| Charger (V) | 2 to 24 |
| Oper. Temp. (°C) | -40 to +85 |
| Package/Pins | QSOP/16 |
| Budgetary Price (See Notes) | 3.39 |
主要特征
- 95% Efficiency
- +5.5V to +26V Input Supply Range
- 2V to 24V Adjustable-Output Voltage Range
- 100% Maximum Duty Cycle (Low Dropout)
- Up to 500kHz PWM Operation
- Optional Synchronous Rectifier
- 16-Pin QSOP Package
- Current-Sense Accuracy:
- 2% (MAX1641)
- 5.3% (MAX1640)
应用/用途
- 备用电池充电器
- 电池供电应用
- 蜂窝电话
- 无绳电话
- 手持终端
- 笔记本电脑、笔记本电脑与掌上电脑
- PCS电话
- 便携式消费类产品
描述
The MAX1640/MAX1641 CMOS, adjustable-output, switch-mode current sources operate from a +5.5V to +26V input, and are ideal for microprocessor-controlled battery chargers. Charging current, maximum output voltage, and pulse-trickle charge are programmed with external resistors. Programming the off-time modifies the switching frequency, suppressing undesirable harmonics in noise-sensitive circuits. The MAX1640's high-side current sensing allows the load to connect directly to ground, eliminating ground-potential errors. The MAX1641 incorporates a low-side current sense.
The MAX1640/MAX1641 step-down pulse-width-modulation (PWM) controllers use an external P-channel MOSFET switch and an optional, external N-channel MOSFET synchronous rectifier for increased efficiency. An internal low-dropout linear regulator provides power for the internal reference and circuitry as well as the gate drive for the N-channel synchronous rectifier.
The MAX1640/MAX1641 are available in space-saving, 16-pin narrow QSOP packages.
The MAX1640/MAX1641 step-down pulse-width-modulation (PWM) controllers use an external P-channel MOSFET switch and an optional, external N-channel MOSFET synchronous rectifier for increased efficiency. An internal low-dropout linear regulator provides power for the internal reference and circuitry as well as the gate drive for the N-channel synchronous rectifier.
The MAX1640/MAX1641 are available in space-saving, 16-pin narrow QSOP packages.
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