概述
The MAX1771 step-up switching controller provides 90% efficiency over a 30mA to 2A load. A unique current-limited pulse-frequency-modulation (PFM) control scheme gives this device the benefits of pulse-width-modulation (PWM) converters (high efficiency at heavy loads), while using less than 110µA of supply current (vs. 2mA to 10mA for PWM converters).
This controller uses miniature external components. Its high switching frequency (up to 300kHz) allows surface-mount magnetics of 5mm height and 9mm diameter. It accepts input voltages from 2V to 16.5V. The output voltage is preset at 12V, or can be adjusted using two resistors.
The MAX1771 optimizes efficiency at low input voltages and reduces noise by using a single 100mV current-limit threshold under all load conditions. A family of similar devices, the MAX770-MAX773, trades some full-load efficiency for greater current-limit accuracy; they provide a 200mV current limit at full load, and switch to 100mV for light loads.
The MAX1771 drives an external N-channel MOSFET switch, allowing it to power loads up to 24W. If less power is required, use the MAX756/MAX757 or MAX761/MAX762 step-up switching regulators with on-board MOSFETs. An evaluation kit is available.
| 关键特性 |
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应用 |
- 90% Efficiency for 30mA to 2A Load Currents
- Up to 24W Output Power
- 110µA (max) Supply Current
- 5µA (max) Shutdown Current
- 2V to 16.5V Input Range
- Preset 12V or Adjustable Output Voltage
- Current-Limited PFM Control Scheme
- Up to 300kHz Switching Frequency
- Evaluation Kit Available
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电池供电应用
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闪存编程
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大功率射频功放电源
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掌上电脑/手持终端
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便携式通信装置
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LCD正偏置电源
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| Key Specifications: Switch-Mode DC-DC Power Supplies |
| Part Number |
Topology |
VIN (min) (V) |
VIN (max) (V) |
Number of DC-DC Outputs |
Preset VOUT (V) |
Digital/VID Programmed Output |
Min. Adjustable VOUT (V) |
Max. Adjustable VOUT (V) |
IOUT (typ) (A) |
Operating Current, ICC (max) (mA) |
Fixed Freq/PWM Operation |
Operating Frequency (kHz) |
Internal Power Switch(es) |
Synchronous Rectifier |
Features |
EV-Kit |
Package |
RoHS Available |
Operating Temp. Range (°C) |
Price |
| MAX1771 |
Step-Up |
2.0 |
16.5 |
1 |
12.0 |
No |
2.0 |
16.5 |
2.0 |
0.11 |
No |
300.0 |
No |
No |
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Yes |
8/PDIP
8/SOIC |
Yes |
0 to +70 -40 to +85 |
$1.80 @ 1k |
| 注释 |
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Output voltages limited by external components. APD bias generator | |
| 图表 |
Typical Operating Circuit |
