Overview
Features and Benefits
- Input Voltage Range:
- 3V to 11V (MAX5026/MAX5028)
- 4.5V to 11V (MAX5025/MAX5027)
- Wide Output Voltage Range: VCC to 36V
- Output Power: 120mW (max)
- User-Adjustable Output Voltage with MAX5025/MAX5026 Using External Feedback Resistors
- Fixed 30V Output Voltage: MAX5027/MAX5028
- Internal 1.3Ω (typ), 40V Switch
- Constant PWM Frequency Provides Easy Filtering in Low-Noise Applications
- 500kHz (typ) Switching Frequency
- 1µA (max) Shutdown Current
- Small, 6-Pin SOT23 Package
Product Details
The MAX5025–MAX5028 constant-frequency, pulse-width modulating (PWM), low-noise boost converters are intended for low-voltage systems that often need a locally generated high voltage. These devices are capable of generating low-noise, high output voltages required for varactor diode biasing in TV tuners, set-top boxes, and PCI cable modems. The MAX5025–MAX5028 operate from as low as 3V and switch at 500kHz.
The constant-frequency, current-mode PWM architecture provides for low output noise that is easy to filter. A 40V lateral DMOS device is used as the internal power switch, making the devices ideal for boost converters up to 36V. The MAX5025/MAX5026 adjustable versions require the use of external feedback resistors to set the output voltage. The MAX5027/MAX5028 offer a fixed 30V output. These devices are available in a small, 6-pin SOT23 package.
Applications
- Avalanche Photodiode Biasing
- LCD Power Supply
- Low-Noise Varactor Diode Biasing
- PCI Cable Modem
- Set-Top Box Tuner Power Supply
- TV Tuner Power Supply
- Voice-Over-Cable
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At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
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