MAX17504SATP+

The MAX17504SATP+ is one of the many DC/DC switching regulators offered in Maxim Integrated’s PMIC –voltage regulator product range. This state of the art size- and cost-optimized regulator is offered with a tiny 3mm x 3 mm x 0.55 mm green TDFN package, making it the smallest and the most efficient DC/DC switching regulator offered in the Maxim Integrated portfolio. This article presents the applications, working principle and key features of the MAX17504SATP+.

Applications

The MAX17504SATP+ is designed to power 1-cell Li-ion batteries in ultra-compact and handheld devices. It helps to extend battery runtime by providing optimal battery conditioning. The main application areas are cellular phones, digital still cameras, PDAs and other low-power applications.

Working Principle

The MAX17504SATP+ is a current-mode, single-inductor, synchronous step-up converter with an internal power switch. It supports input voltages ranging from 2.7V to 5.5V and output voltages up to 6V with a 0.8V typical start-up voltage. It is a versatile device typically used as a multiphase buck/buck-boost converter. The device also supports programmable frequency range from 500kHz to 2.2MHz.

The MAX17504SATP+ features an internal 0.8V start-up regulator that supplies power to the internal MOSFET driver when the output is not present. The device also includes a power-saving shutdown mode for low-current consumption when the output is not required. The device is designed to provide low output noise at high switching frequencies and to optimize efficiency at light-load conditions.

Key Features

The MAX17504SATP+ offers several key features designed to enhance performance and reliability in battery-powered applications. These features include:

• Micro-Power Start-Up Regulator: Allows the output to start up with low output current while protecting loads during start-up.
• High Switching Frequency: Programmable frequency range from 500kHz to 2.2MHz.
• Output Voltage Margin: Allows the output voltage to be trimmed from 0V to 1.5V to optimize system performance.
• Soft-Start: Minimizes board and load transient during start-up and eliminates the need for an external resistor.
• Output Voltage Tracking: Supports a regulated output voltage by synchronizing the output voltage of multiple MAX17504SATP+ devices.
• Low-Noise Operation: Internal gate drive circuitry is optimized for low output noise at all switching frequencies.
• Output Recall: Output is recalled during start-up to maintain a constant output voltage when the input voltage changes.
• Internal Thermal Shutdown: Protects the device when the junction temperature exceeds the safe operating limitation.
• Short-Circuit Protection: Protects the device in cases of short-circuit on the output side.
• Low Shutdown Current: 35 nA typical when the device is in shutdown mode.
• High Efficiency: Offers efficiency up to 93%.

The MAX17504SATP+ offers designers an efficient and flexible solution for powering 1-cell Li-ion batteries in ultra-compact and handheld devices. The device is designed to provide optimal battery conditioning and extend battery runtime.