Analog Devices MAX5025 Product Info

• Input Voltage Range:
  • 3V to 11V (MAX5026/MAX5028)
  • 4.5V to 11V (MAX5025/MAX5027)
• Wide Output Voltage Range: V_CC 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

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