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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) | 8 |
| Switch Type | External |
| Preset VOUT (V) | 2.5 3.3 |
| Output Adjust. Method | Preset Resistor |
| Synchronous Switching? | Yes |
| # DC-DC Outputs | 1 |
| Switching Frequency (kHz) | 600 |
| Package/Pins | See Data Sheet |
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简化框图
技术文档
| 数据资料 | 高速、降压型控制器，用于笔记本电脑 | Sep 16, 2005 | |
| 应用笔记 | Thermistor Linearizes Current Limit |
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) | 8 |
| Switch Type | External |
| Preset VOUT (V) | 2.5 3.3 |
| Output Adjust. Method | Preset Resistor |
| Synchronous Switching? | Yes |
| # DC-DC Outputs | 1 |
| Switching Frequency (kHz) | 600 |
| Package/Pins | See Data Sheet |
主要特征
- Ultra-High Efficiency
- No Current-Sense Resistor (Lossless ILIMIT)
- Quick-PWM with 100ns Load-Step Response
- 1% VOUT Accuracy Over Line and Load
- 2.5V/3.3V Fixed or 1V to 5.5V Adjustable Output Range
- 2V to 28V Battery Input Range
- 200/300/450/600kHz Switching Frequency
- Overvoltage Protection (MAX1714A)
- Undervoltage Protection
- 1.7ms Digital Soft-Start
- Drives Large Synchronous-Rectifier FETs
- 2V ±1% Reference Output
- Power-Good Indicator
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 MAX1714 pulse-width modulation (PWM) controller provides the high efficiency, excellent transient response, and high DC output accuracy needed for stepping down high-voltage batteries to generate low-voltage CPU core or chip-set/RAM supplies in notebook computers.
Maxim's proprietary Quick-PWM quick-response, constant-on-time PWM control scheme handles wide input/output voltage ratios with ease and provides 100ns "instant-on" response to load transients while maintaining a relatively constant switching frequency.
The MAX1714 achieves high efficiency at a reduced cost by eliminating the current-sense resistor found in traditional current-mode PWMs. Efficiency is further enhanced by an ability to drive very large synchronous-rectifier MOSFETs.
Single-stage buck conversion allows these devices 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 MAX1714 is intended for CPU core, chipset, DRAM, or other low-voltage supplies as low as 1V. The MAX1714A is available in a 20-pin QSOP package and includes overvoltage protection. The MAX1714B is available in a 16-pin QSOP package with no overvoltage protection. For applications requiring VID compliance or DAC control of output voltage, refer to the MAX1710/MAX1711 data sheet. For a dual output version, refer to the MAX1715 data sheet.
Maxim's proprietary Quick-PWM quick-response, constant-on-time PWM control scheme handles wide input/output voltage ratios with ease and provides 100ns "instant-on" response to load transients while maintaining a relatively constant switching frequency.
The MAX1714 achieves high efficiency at a reduced cost by eliminating the current-sense resistor found in traditional current-mode PWMs. Efficiency is further enhanced by an ability to drive very large synchronous-rectifier MOSFETs.
Single-stage buck conversion allows these devices 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 MAX1714 is intended for CPU core, chipset, DRAM, or other low-voltage supplies as low as 1V. The MAX1714A is available in a 20-pin QSOP package and includes overvoltage protection. The MAX1714B is available in a 16-pin QSOP package with no overvoltage protection. For applications requiring VID compliance or DAC control of output voltage, refer to the MAX1710/MAX1711 data sheet. For a dual output version, refer to the MAX1715 data sheet.
技术文档
| 数据资料 | 高速、降压型控制器，用于笔记本电脑 | Sep 16, 2005 | |
| 应用笔记 | Thermistor Linearizes Current Limit |
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