ADP1828 Synchronous Buck PWM, Step-Down, DC-to-DC Controller

The ADP1828 is a versatile and synchronous PWM voltage mode buck controller. It drives an all N-channel power stage to regulate an output voltage as low as 0.6 V to 85% of the input voltage and is sized to handle large MOSFETs for point-of-load regulators. The ADP1828 is ideal for a wide range of high power applications, such as DSP and processor core I/O power, and general-purpose power in telecommunications, medical imaging, PC, gaming, and industrial applications. It operates from input bias voltages of 3 V to 20 V with an internal LDO that generates a 5 V output for input bias voltages greater than 5.5 V.

The ADP1828 operates at a pin-selectable, fixed switching frequency of either 300 kHz or 600 kHz, or at any frequency between 300 kHz and 600 kHz with a resistor. The switching frequency can also be synchronized to an external clock up to 2× the part’s nominal oscillator frequency. The clock output can be used for synchronizing additional ADP1828s (or the ADP1829 controllers), thus eliminating the need for an external clock source. The ADP1828 includes soft start protection to limit any inrush current from the input supply during startup, reverse current protection during soft start for a precharged output, as well as a unique adjustable lossless current-limit scheme utilizing external MOSFET RDSONsensing.

For applications requiring power-supply sequencing, the ADP1828 provides a tracking input that allows the output voltage to track during startup, shutdown, and faults. The additional supervisory and control features include thermal overload, undervoltage lockout, and power good.

The ADP1828 operates over the −40°C to +125°C junction temperature range and is available in a 20-lead QSOP.

Applications

Telecom and networking systems
Base station power
Set-top boxes, game consoles
Printers and copiers
Medical imaging systems
DSP and microprocessor core power supplies
DDR termination

Features and Benefits

Wide bias voltage range 3.0 V to 20 V
Wide power stage input range 1 V to 24 V
Wide output voltage range: 0.6 V to 85% of input voltage
±0.85% accuracy at 0°C to 70°C
All N-channel MOSFET design for low cost
Fixed-frequency operation at 300 kHz, 600 kHz, or resistor adjustable 300 kHz to 600 kHz