The MAX5025-MAX5028 are constant-frequency, pulse-width modulating (PWM), low-noise boost converters designed for low-voltage systems that require locally generated high voltage. They 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.
The MAX5025‑MAX5028 family are constant‑frequency, current‑mode PWM boost converters designed for low‑voltage systems that need a locally generated high voltage. They operate from 3 V to 11 V input and can produce up to 36 V output, making them suitable for varactor diode biasing in TV tuners, set‑top boxes, and PCI cable modems.
These devices are offered in a compact 6‑pin SOT‑23 package, feature a 40 V internal DMOS switch, and provide low‑noise operation with a fixed 500 kHz switching frequency. The MAX5025/5026 versions have adjustable output via external feedback resistors, while the MAX5027/5028 versions deliver a fixed 30 V output.
| Input Voltage Range | 3 V to 11 V (MAX5026/5028), 4.5 V to 11 V (MAX5025/5027) |
|---|---|
| Output Voltage Range | VCC to 36 V |
| Maximum Output Power | 120 mW (max) |
| Switching Frequency | 500 kHz (typ) |
| Shutdown Current | 1 pA (max) |
| Internal Switch Voltage Rating | 40 V |
| Package | 6‑Pin SOT‑23 |
The converters operate at a typical fixed frequency of 500 kHz.
The devices can deliver up to 120 mW of output power.
They are supplied in a compact 6‑pin SOT‑23 package.
The MAX5026 operates from 3 V to 11 V input.