Features and Benefits
- Fixed frequency operation: 300 kHz, 600 kHz, or synchronized operation up to 1 MHz
- Supply input range: 3.0 V to 20V
- Wide power stage input range: 1 V to 24 V
- Interleaved operation results in smaller, low cost input capacitor
- All-N-channel MOSFET design for low cost
- ±0.85% accuracy at 0°C to 70°C
- Soft start, thermal overload, current-limit protection
- 10 µA shutdown supply current
- Internal linear regulator
- Lossless RDSON current-limit sensing
- Reverse current protection during soft start for handling precharged outputs
- Independent Power OK outputs
- Voltage tracking for sequencing or DDR termination
- Available in 5 mm × 5 mm, 32-lead LFCSP
The ADP1829 is a versatile, dual, interleaved, synchronous PWM buck controller that generates two independent output rails from an input of 3.0 V to 20 V, with power input voltage ranging from 1.0 V to 24 V. Each controller can be configured to provide output voltages from 0.6 V to 85% of the input voltage and is sized to handle large MOSFETs for point-of-load regulators. The two channels operate 180° out of phase, reducing stress on the input capacitor and allowing smaller, low cost components. The ADP1829 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.
The ADP1829 operates at a pin-selectable, fixed switching frequency of either 300 kHz or 600 kHz, minimizing external component size and cost. For noise-sensitive applications, it can also be synchronized to an external clock to achieve switching frequencies between 300 kHz and 1 MHz. The ADP1829 includes soft start protection to prevent inrush current from the input supply during startup, reverse current protection during soft start for precharged outputs, as well as a unique adjustable lossless current-limit scheme utilizing external MOSFET sensing.
For applications requiring power supply sequencing, the ADP1829 also provides tracking inputs that allow the output voltages to track during startup, shutdown, and faults. This feature can also be used to implement DDR memory bus termination.
The ADP1829 is specified over the −40°C to +125°C junction temperature range and is available in a 32-lead LFCSP package.
- Telecommunications and networking systems
- Medical imaging systems
- Base station power
- Set-top boxes
- DDR termination
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
This describes the design, operation, and test results obtained with the ADP1829 evaluation board. The input range for this evaluation board is 5.5 V to 18 V. The output voltages are configured for VOUT1 = 1.8 V (with a maximum current limit of 15 A) and for VOUT2 = 1.2 V (with a maximum current limit of 15 A). All of the results tested on the evaluation board ran at a switching frequency (fSW) of 300 kHz with VIN = 12 V, VOUT1 = 1.2 V at up to 15 A, and VOUT2 = 1.8 V at up to 15 A.
Tools & Simulations
Power Reference Designs (11)
Circuit Note (1)
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.