The MAX5042/MAX5043 are isolated multimode PWM power ICs that feature integrated switching power MOSFETs connected in a voltage-clamped, two-transistor, power-circuit configuration. These devices operate from a wide 20V to 76V input voltage range. The MAX5042 includes a hot-swap controller for use with an external power MOSFET to limit inrush current for applications where the power supply is plugged into a live power backplane. The MAX5043 does not include a hot-swap controller. The voltage-clamped power topology of the MAX5042/MAX5043 enables full recovery of stored magnetizing and leakage inductive energy for enhanced efficiency and reliability. Operating at up to 500kHz switching frequency, these devices provide up to 50W of output power. The MAX5042/MAX5043 allow the implementation of both forward and flyback voltage or current-mode converter topologies. A dedicated latched external shutdown provides protection in addition to internal thermal shutdown. The MAX5042/MAX5043 achieve higher efficiency when used with secondary-side synchronous rectification. These devices generate a look-ahead signal for driving secondary-side synchronous rectifiers. The MAX5042/MAX5043 are rated for operation over the -40°C to +125°C and -40°C to +85°C temperature range, respectively, and are available in a small surface-mount 56-pin thin QFN package.
The MAX5042 and MAX5043 are isolated multinode PWM power ICs that integrate switching MOSFETs in a voltage‑clamped two‑transistor topology. They operate from a wide 20 V to 76 V input range and can deliver up to 50 W of output power, supporting both forward and flyback converter topologies. The MAX5042 includes an integrated hot‑swap controller to limit inrush current, while the MAX5043 does not.
These devices are targeted at high‑efficiency telecom and datacom power supplies, router/switch backplane systems, servers, xDSL line cards, and automotive 48 V power modules. They are offered in a 56‑pin thin QFN package and feature protection functions such as over‑temperature shutdown, short‑circuit protection, and programmable brown‑out lockout.
| Input Supply Voltage Range | 20 V to 76 V |
|---|---|
| Maximum Output Power | 50 W |
| Maximum Switching Frequency | 500 kHz |
| Package Type | 56‑Pin Thin QFN |
| Hot‑Swap Controller | Integrated in MAX5042 only |
The devices operate from 20 V to 76 V input voltage.
Yes, the MAX5042 includes an integrated hot‑swap controller; the MAX5043 does not.
They can deliver up to 50 W of output power.