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主要特征
应用/用途
Parametric specs for Step-Down Switching Regulators
VIN (V) (min) | 2 |
VIN (V) (max) | 28 |
VOUT1 (V) (min) | 1 |
VOUT1 (V) (max) | 5.5 |
IOUT1 (A) (max) | 10 |
Switch Type | External |
Preset VOUT (V) | 1.5 1.8 2.5 |
Output Adjust. Method | Preset Resistor |
Synchronous Switching? | Yes |
# DC-DC Outputs | 2 |
Switching Frequency (kHz) | 540 |
Package/Pins | TQFN/36 |
Budgetary Price (See Notes) | 1.75 |
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Technical Docs
数据资料 | 双路、高效率、降压型控制器,带有精确限流 | Mar 20, 2003 | |
应用笔记 | Choosing the Right DC-DC Converter for Automotive Applications |
参量
Parametric specs for Step-Down Switching Regulators
VIN (V) (min) | 2 |
VIN (V) (max) | 28 |
VOUT1 (V) (min) | 1 |
VOUT1 (V) (max) | 5.5 |
IOUT1 (A) (max) | 10 |
Switch Type | External |
Preset VOUT (V) | 1.5 1.8 2.5 |
Output Adjust. Method | Preset Resistor |
Synchronous Switching? | Yes |
# DC-DC Outputs | 2 |
Switching Frequency (kHz) | 540 |
Package/Pins | TQFN/36 |
Budgetary Price (See Notes) | 1.75 |
主要特征
- Ultra-High Efficiency
- Accurate Current-Limit Option
- Quick-PWM™ with 100ns Load-Step Response
- 1% VOUT Accuracy over Line and Load
- Dual Mode™ Fixed 1.8V/1.5V/Adj or 2.5V/Adj Outputs
- Adjustable 1V to 5.5V Output Range
- 2V to 28V Battery Input Range
- 200/300/420/540kHz Nominal Switching Frequency
- Adjustable Overvoltage Protection
- 1.7ms Digital Soft-Start
- Drives Large Synchronous-Rectifier FETs
- Power-Good Window Comparator
- 2V ±1% Reference Output
应用/用途
- 1.8V与2.5V I/O电源
- 芯片组/RAM供电,电压可低至1V
- CPU核电源
- 笔记本电脑
描述
The MAX1845 is a dual PWM controller configured for step-down (buck) topologies that provides high efficiency, excellent transient response, and high DC output accuracy necessary for stepping down high-voltage batteries to generate low-voltage chipset and RAM power supplies in notebook computers. The CS_ inputs can be used with low-side sense resistors to provide accurate current limits or can be connected to LX_, using low-side MOSFETs as current-sense elements.
The on-demand PWM controllers are free running, constant on-time with input feed-forward. This configuration provides ultra-fast transient response, wide input-output differential range, low supply current, and tight load-regulation characteristics. The MAX1845 is simple and easy to compensate.
Single-stage buck conversion allows the MAX1845 to directly step down high-voltage batteries for the highest possible efficiency. Alternatively, two-stage conversion (stepping down the 5V system supply instead of the battery at a higher switching frequency) allows the minimum possible physical size.
The MAX1845 is intended for generating chipset, DRAM, CPU I/O, or other low-voltage supplies down to 1V. For a single-output version, refer to the MAX1844 data sheet. The MAX1845 is available in 28-pin QSOP and 36-pin thin QFN packages.
The on-demand PWM controllers are free running, constant on-time with input feed-forward. This configuration provides ultra-fast transient response, wide input-output differential range, low supply current, and tight load-regulation characteristics. The MAX1845 is simple and easy to compensate.
Single-stage buck conversion allows the MAX1845 to directly step down high-voltage batteries for the highest possible efficiency. Alternatively, two-stage conversion (stepping down the 5V system supply instead of the battery at a higher switching frequency) allows the minimum possible physical size.
The MAX1845 is intended for generating chipset, DRAM, CPU I/O, or other low-voltage supplies down to 1V. For a single-output version, refer to the MAX1844 data sheet. The MAX1845 is available in 28-pin QSOP and 36-pin thin QFN packages.
Technical Docs
数据资料 | 双路、高效率、降压型控制器,带有精确限流 | Mar 20, 2003 | |
应用笔记 | Choosing the Right DC-DC Converter for Automotive Applications |