The ADP1828YRQZ-R7 is a versatile and synchronous PWM voltagemode buck controller. It drives an all N-channel power stageto regulate an output voltage as low as 0.6 V to 85% of the inputvoltage and is sized to handle large MOSFETs for point-of-loadregulators. The ADP1828YRQZ-R7 is ideal for a wide range of high powerapplications, such as DSP and processor core I/O power, andgeneral-purpose power in telecommunications, medical imaging,PC, gaming, and industrial applications. It operates from inputbias voltages of 3 V to 20 V with an internal LDO that generatesa 5 V output for input bias voltages greater than 5.5 V.
The ADP1828YRQZ-R7 operates at a pin-selectable, fixed switchingfrequency of either 300 kHz or 600 kHz, or at any frequencybetween 300 kHz and 600 kHz with a resistor. The switchingfrequency can also be synchronized to an external clock up to2× the part’s nominal oscillator frequency. The clock output canbe used for synchronizing additional ADP1828s (or theADP1829 controllers), thus eliminating the need for an externalclock source. The ADP1828YRQZ-R7 includes soft start protection tolimit any inrush current from the input supply during startup,reverse current protection during soft start for a prechargedoutput, as well as a unique adjustable lossless current-limitscheme utilizing external MOSFET RDSON sensing.
For applications requiring power-supply sequencing, theADP1828YRQZ-R7 provides a tracking input that allows the outputvoltage to track during startup, shutdown, and faults. Theadditional supervisory and control features include thermaloverload, undervoltage lockout, and power good.
The ADP1828YRQZ-R7 operates over the −40°C to +125°C junctiontemperature range and is available in a 20-lead QSOP and 20-lead, 4mm × 4mm LFCSP.
Feature
- 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 resistoradjustable 300 kHz to 600 kHz
- Clock output for synchronizing other controllers
- No current sense resistor required
- Internal linear regulator
- Voltage tracking for sequencing
- Soft start and thermal overload protection
- Overvoltage and undervoltage power-good indicator
- 15 μA shutdown supply current
- Available in a 20-lead QSOP and 20-lead, 4mm × 4 mm LFCSP
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
(Picture: Pinout)
