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500kHz, 36V Output, SOT23, PWM Step-Up DC-DC Converters

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.

Key Features

  • 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

Applications/Uses

  • 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
Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 3
VIN (V) (max) 11
VOUT1 (V) (min) 5
VOUT1 (V) (max) 36
IOUT1 (A) (max) 0.04
Switch Type Internal
Output Adjust. Method Resistor
ICC (mA) (typ) 0.35
# DC-DC Outputs 1
Switching Frequency (kHz) 500
Package/Pins SOT23/6
Budgetary
Price (See Notes)
$0.53 @1k
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Simplified Block Diagram

MAX5025, MAX5026, MAX5027, MAX5028: Typical Operating Circuit MAX5025, MAX5026, MAX5027, MAX5028: Typical Operating Circuit Zoom icon

Design & Development

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Description

The MAX5026 evaluation kit (EV kit) provides a +30V output voltage from a +3V to +11V input source. It delivers up to 6mA output current, depending on the input voltage. The MAX5026 is a constant-frequency, pulse-width-modulating (PWM), current-mode step-up voltage converter with an internal power switch that operates at 500kHz. This EV kit demonstrates the low-noise performance of the device.

The MAX5026 EV kit is a fully assembled and tested surface-mount circuit board. With modifications, this EV kit can also be used to evaluate MAX5025/MAX5027/MAX5028. The EV kit can be used to evaluate other output voltages by changing the feedback resistors.

View Details

Features

  • +3V to +11V Input Voltage Range (MAX5026/MAX5028)
  • +4.5V to +11V Input Voltage Range (MAX5025/MAX5027)
  • Output Voltage:
    • Adjustable Output Voltage Up to +36V (MAX5025/MAX5026)
    • +30V Fixed Output Voltage (MAX5027/MAX5028)
  • Low Switching Noise
  • 500kHz Switching Frequency
  • Less than 1mVP-P High-Frequency Output Switching Ripple at 2mA Load
  • Up to 6mA Output Current with +5V Input
  • 6-Pin SOT23 Package
  • Surface-Mount Construction
  • Fully Assembled and Tested

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Parameters

Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 3
VIN (V) (max) 11
VOUT1 (V) (min) 5
VOUT1 (V) (max) 36
IOUT1 (A) (max) 0.04
Switch Type Internal
Output Adjust. Method Resistor
ICC (mA) (typ) 0.35
# DC-DC Outputs 1
Switching Frequency (kHz) 500
Package/Pins SOT23/6
Budgetary
Price (See Notes)
$0.53 @1k

Key Features

  • 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

Applications/Uses

  • 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

Description

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.

Simplified Block Diagram

MAX5025, MAX5026, MAX5027, MAX5028: Typical Operating Circuit MAX5025, MAX5026, MAX5027, MAX5028: Typical Operating Circuit Zoom icon

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal