Analog Devices Inc./Maxim Integrated

The MAX17230/MAX17231 offers dual synchronous stepdown DC-DC controllers with integrated MOSFETs and a step-up/boost controller. They operate over a 3.5V to 36V input voltage range, and down to 2V with the boost controller active. The devices can operate in dropout condition by running at 95% duty cycle. The controllers can generate fixed output voltages of 3.3V/5V, along with the capability to program the output voltage between 1V to 10V.These devices use current-mode-control architecture and can be operated in the pulse-width modulation (PWM) or pulse-frequency modulation (PFM) control schemes. PWM operation provides constant frequency operation at all loads and is useful in applications sensitive to switching frequency. PFM operation disables negative inductor current and additionally skips pulses at light loads for high-efficiency. The low-resistance, on-chip MOSFETs ensure high efficiency at full load and simplify the layout.The MAX17230/MAX17231 include a boost controller. This boost circuitry turns on during low input voltage conditions. It is designed to power step-down controller channels with input voltages as low as 2V.These devices are available in a 40-pin TQFN package with exposed pad, and are specified for operation over -40°C to +85°C.ApplicationsDistributed Supply RegulationGeneral-Purpose Point-of-LoadWall Transformer Regulation

The MAX17232/MAX17233 offers dual synchronous step-down DC-DC controllers with integrated MOSFETs. They operates over a 3.5V to 36V input voltage range with 42V input transient protection, and can operate in dropout condition by running at 95% duty cycle. The controllers can generate fixed output voltages of 3.3V/5V, along with the capability to program the output voltage between 1V to 10V.These devices use a current-mode-control architecture.The devices can be operated in pulse-width modulation (PWM) or pulse-frequency modulation (PFM) control schemes. PWM operation provides constant frequency operation at all loads, and is useful in applications sensitive to switching frequency. PFM operation disables negative inductor current and additionally skips pulses at light loads for high efficiency. The low-resistance, on-chip MOSFETs ensure high efficiency at full load and simplify the layout.The devices are available in a 28-pin TQFN-EP package with exposed pad, and are specified for operation over -40°C to +85°C.ApplicationsDistributed Supply RegulationGeneral-Purpose Point-of-LoadWall Transformer Regulation

The MAX17242/MAX17243 high-efficiency, synchronous step-down DC-DC converters with integrated MOSFETs operates over a 3.5V to 36V input voltage range, and can operate in drop-out condition by running at 99% duty cycle. The converters deliver up to 2A (MAX17242) and 3A (MAX17243) output current and generate fixed output voltages of 3.3V/5V, along with the ability to program the output voltage between 1V to 10V.The devices use a current-mode-control architecture and can be operated in the pulse-width modulation (PWM) or pulse-frequency modulation (PFM) control schemes. PWM operation provides constant frequency operation at all loads, and is useful in applications sensitive to switching frequency. PFM operation disables negative inductor current and additionally skips pulses at light loads for high-efficiency operation. The low-resistance, on-chip MOSFETs ensure high efficiency at full load and simplify the layout.The devices are available in a compact 20-pin (5mm x 5mm) TQFN package with exposed pad. These parts are rated for -40°C to +85°C operation.Design Solution: Online Simulator Validates Buck Converter Output Error Budget Analysis ›ApplicationsDistributed Supply RegulationGeneral-Purpose Point-of-LoadWall Transformer Regulation

The MAX17244 high-efficiency, synchronous step-down DC-DC converter with integrated MOSFETs operates over a 3.5V to 36V input voltage range with 42V input transient protection. The device can operate in dropout condition by running at 98% duty cycle. This converter delivers up to 2.5A and generates fixed output voltages of 3.3V/5V, along with the ability to program the output voltage between 1V to 10V.The MAX17244 uses a current-mode control architecture. The device can operate in the pulse-width modulation (PWM) or pulse-frequency modulation (PFM) control schemes. PWM operation provides constant frequency operation at all loads, and is useful in applications sensitive to switching frequency. PFM operation disables negative inductor current and additionally skips pulses at light loads for high efficiency. Under light-load applications, the external sync pin FSYNC logic input allows the device to operate either in PFM mode for reduced current consumption or fixed-frequency FPWM (forced-PWM) mode to eliminate frequency variation to minimize EMI. Fixed-frequency FPWM mode is extremely useful for power supplies designed for RF transceivers where tight emission control is necessary.This device is available in a compact 16-pin (5mm x 5mm) TQFN package with exposed pad and 16-pin TSSOP. -40°C to +85°C operation.ApplicationsDistributed Supply RegulationGeneral-Purpose Point-of-LoadWall Transformer Regulation