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Analog Devices Inc. ADP3159JRU-REEL7
- Part No.:
- ADP3159JRU-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADP3159JRU-REEL7.pdf
- Description:
- 4 BIT PROGRAMMABLE SYNCHRONOUS B
- Quantity:
- Payment:
- Shipping:
Inventory:7,000
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Product details
Overview
ADP3159JRU-REEL7 from Analog Devices is a 4-bit programmable synchronous buck controller for Intel Pentium III and Celeron core voltage regulation, featuring active voltage positioning (ADOPT™), ±0.8% output accuracy over temperature, 1.3 V to 2.05 V VID-programmable output, and integrated 2.5 V/1.8 V linear regulator controllers in a 20-lead TSSOP package.
For engineers reviewing the ADP3159JRU-REEL7 datasheet, ADP3159JRU-REEL7 pinout, ADP3159JRU-REEL7 application, or ADP3159JRU-REEL7 equivalent, this device delivers VRM 8.4–compliant core power with crowbar overvoltage protection, current-mode constant off-time control, and dual linear regulator gate drivers - critical for motherboard-level CPU power delivery design and validation.
Technical Context
The ADP3159JRU-REEL7 implements a current-mode, constant off-time architecture where switching frequency varies inversely with input-to-output voltage ratio; off-time is set by an external CT capacitor (e.g., 150 pF for ~200 kHz at 1.7 V). It integrates a 4-bit VID DAC, error amplifier (2.2 mmho transconductance), and dual current-sense comparators with 69–87 mV threshold range.
Its ADOPT™ technology dynamically adjusts output voltage vs. load current to optimize transient response without requiring additional output capacitance; the crowbar function activates at +20% nominal DAC voltage and releases at ~50%, while PWRGD asserts after 500 ms within ±20% regulation band.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 1.3 V to 2.05 V, digitally programmed via 4-bit VID code per Intel VRM 8.4 - enables single-controller support across multiple CPU voltage requirements. |
| Total Output Accuracy | ±0.8% over 0°C to 70°C - ensures compliance with tight core voltage tolerances for Pentium III/Celeron processors under full thermal and load variation. |
| Crowbar Trip Point | 115–125% of nominal DAC voltage - provides hardware-level microprocessor protection without external circuitry by forcing low-side MOSFET conduction. |
| Linear Regulator Outputs | Fixed 2.5 V (±2.5%) and 1.8 V (±2.5%) - powers AGP, GTL, and other auxiliary rails directly from internal controllers driving external N-MOSFETs. |
| UVLO Threshold | 6.75 V to 7.25 V - prevents operation until VCC stabilizes above minimum bias level, ensuring reliable startup sequencing in multi-rail systems. |
| Power Good Delay | 500 ms assertion time - guarantees stable core voltage before releasing system reset, meeting Intel motherboard timing requirements. |
| Package | 20-lead TSSOP (RU-20) - surface-mount footprint compatible with high-density motherboard layouts and automated assembly. |
Pinout & Package
The ADP3159JRU-REEL7 is housed in a 20-lead Thin Shrink Small Outline Package (TSSOP, RU-20) with exposed pad for thermal enhancement. Pin 1 is located at top-left corner (notch-marked side); pins 1 and 19 are no-connect.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VID0–VID3 | Voltage identification digital inputs | Read 4-bit code from CPU to set FB reference; internally pulled up to 5.4 V - eliminates need for external pull-ups in standard VRM designs. |
| FB | Feedback input for main buck regulator | Remote sense point for closed-loop regulation; connects to CPU VSENSE net - enables precise core voltage control despite PCB IR drop. |
| CS+, CS− | Differential current sense inputs | Monitor inductor current via sense resistor; 69–87 mV threshold range supports accurate current limiting and ADOPT™ slope tracking. |
| DRVH, DRVL | High-side and low-side gate drivers | Drive external N-channel MOSFETs with 6 Ω on-resistance and 80 ns transition time - minimizes switching losses at 200 kHz operation. |
| LRDRV1, LRDRV2 | Linear regulator gate drivers | Control external N-MOSFETs for 2.5 V and 1.8 V rails; remain active during UVLO - ensures auxiliary rail availability before main core power-up. |
| PWRGD | Open-drain power-good indicator | Sinks current when output is within ±20% of target for ≥500 ms - interfaces directly with chipset reset logic without level-shifting. |
| CT | Off-time timing capacitor connection | External capacitor (e.g., 150 pF) sets fixed off-time (~3.5–4.5 µs); determines operating frequency and ripple trade-off - enables optimization for size vs. efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| ADOPT™ Active Voltage Positioning | Adjusts output voltage linearly with load current to minimize peak transient deviation - reduces required output capacitance by up to 50% versus passive positioning. |
| Integrated Overvoltage Crowbar | Triggers at +20% nominal DAC voltage and releases at ~50% - protects CPU from catastrophic overvoltage without external SCRs or comparators. |
| Dual Linear Regulator Controllers | Fixed 2.5 V and 1.8 V outputs with ±2.5% accuracy - eliminates need for separate LDOs in VRM-compliant motherboards, saving board space and BOM cost. |
| VRM 8.4 Compliance | Meets all electrical, timing, and protection requirements for Pentium III/Celeron core supplies - simplifies qualification and eliminates custom validation effort. |
| Current-Mode Constant Off-Time Control | No slope compensation needed; stable across wide VIN/VOUT ratios - enables robust operation with 5 V input and 1.3–2.05 V outputs without loop instability. |
Applications
| Desktop CPU Core Power | Server Board VRM Module |
|---|---|
Use Scenario: Generating regulated 1.7 V core supply for 750 MHz Pentium III processor on ATX motherboard with 15 A peak load. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-side/low-side N-MOSFET switching, VID decoding, and transient response via ADOPT™. Use Value: Achieves ±80 mV transient tolerance with only five 1000 µF Rubycon ZA-series capacitors (ESR < 5 mΩ), reducing component count vs. non-ADOPT solutions. | Use Scenario: Dual-rail power delivery on dual-processor server board requiring independent core and I/O voltage rails. IC Role / Device Role / Timing Role: Main controller for primary CPU core rail; its embedded 2.5 V/1.8 V linear regulators supply AGP and GTL+ buses. Use Value: Eliminates two discrete LDOs and associated passives, shrinking VRM footprint by >30% while maintaining Intel-specified auxiliary rail timing and accuracy. |
| Notebook Docking Station PSU | Industrial Embedded x86 Module |
Use Scenario: Compact docking station supplying 1.5 V core power to Celeron-based compute module with thermal constraints. IC Role / Device Role / Timing Role: Buck controller with crowbar protection and PWRGD signaling - ensures safe hot-plug operation and fault containment. Use Value: Crowbar activation at 1.8 V (for 1.5 V nominal) prevents CPU latch-up during transient overvoltage events caused by connector arcing or supply coupling. | Use Scenario: Ruggedized embedded system using Pentium III derivative CPU in extended-temperature industrial environment. IC Role / Device Role / Timing Role: Temperature-stable core regulator (0°C to 70°C spec) with UVLO hysteresis (1.0 V) for reliable cold-start behavior. Use Value: Maintains ±0.8% output accuracy across full commercial temperature range - avoids firmware-based voltage trimming and simplifies calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADP3179JRU-REEL7 | Same pinout and core architecture, but linear regulators are adjustable (not fixed 2.5 V/1.8 V); requires external resistor dividers for LRFB1/LRFB2. | Used where auxiliary rail voltages differ from standard 2.5 V/1.8 V (e.g., 3.3 V AGP or 1.25 V GTL+). | Select ADP3179JRU-REEL7 only if flexible linear regulator outputs are required; ADP3159JRU-REEL7 is optimal for standard VRM 8.4 implementations. |
| ISL6522CRZ-T | 6-bit VID (1.1–2.05 V), higher accuracy (±0.5%), but no integrated linear regulator controllers - requires external LDOs for auxiliary rails. | Targeted at higher-end Pentium 4 platforms with tighter voltage margins and separate auxiliary power management. | Choose ISL6522CRZ-T when 6-bit resolution and sub-0.5% accuracy are mandatory; ADP3159JRU-REEL7 offers lower BOM cost and simpler layout for Pentium III/Celeron. |
Compared with ADP3179JRU-REEL7, ADP3159JRU-REEL7 provides plug-and-play 2.5 V/1.8 V auxiliary rails without external components, while ISL6522CRZ-T trades integrated linear regulation for finer VID resolution and tighter accuracy - making ADP3159JRU-REEL7 the most cost-effective, drop-in solution for legacy VRM 8.4 designs.
Availability
ADP3159JRU-REEL7 is available at Aetrix Electronics and suitable for desktop motherboard development, server VRM modules, notebook docking station power supplies, and industrial x86 embedded systems requiring stable component supply and long-term lifecycle support.
Supply support for ADP3159JRU-REEL7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and power management markets.
The ADP3159JRU-REEL7 belongs to Analog Devices' VRM-compliant CPU power controller product line, designed specifically to meet Intel's Pentium III/Celeron core voltage regulation requirements with integrated protection, accuracy, and auxiliary rail generation.
FAQ
What is the primary function of the ADP3159JRU-REEL7 in a CPU power delivery system?
The ADP3159JRU-REEL7 serves as the main synchronous buck controller for generating the core supply voltage (1.3 V to 2.05 V) for Intel Pentium III and Celeron processors. It decodes the CPU's 4-bit VID code, regulates output via current-mode constant off-time control, implements ADOPT™ for optimal transient response, and drives external N-MOSFETs while providing integrated 2.5 V and 1.8 V linear regulator controllers. Its crowbar and PWRGD functions ensure system-level safety and sequencing.
How does the ADOPT™ technology in the ADP3159JRU-REEL7 improve load transient performance?
ADOPT™ (Analog Devices Optimal Positioning Technology) dynamically lowers the output voltage proportionally to increasing load current, positioning it optimally before a transient occurs. This reduces peak undershoot during sudden load steps - enabling compliance with Intel's ±80 mV transient tolerance using fewer output capacitors. In the ADP3159JRU-REEL7, ADOPT™ is implemented through the error amplifier's interaction with the current sense path, eliminating need for external compensation networks.
What are the key differences between ADP3159JRU-REEL7 and ADP3179JRU-REEL7?
The ADP3159JRU-REEL7 features fixed 2.5 V and 1.8 V linear regulator outputs, while the ADP3179JRU-REEL7 provides adjustable linear regulator outputs set via external resistor dividers on LRFB1 and LRFB2. Both share identical buck controller functionality, pinout, VID range, and ADOPT™ implementation. The ADP3159JRU-REEL7 is optimized for standard VRM 8.4 designs; ADP3179JRU-REEL7 targets custom auxiliary rail configurations.
Does the ADP3159JRU-REEL7 require external components for overvoltage protection?
No. The ADP3159JRU-REEL7 includes an integrated overvoltage crowbar function that activates when output exceeds 115–125% of the nominal DAC-set voltage. It forces the low-side MOSFET fully on to short the output, protecting the CPU without any external SCRs, comparators, or resistors. The crowbar releases automatically when voltage falls to ~50% of nominal, allowing recovery once the fault is cleared.
What is the recommended CT capacitor value for achieving ~200 kHz operation with ADP3159JRU-REEL7 at 1.7 V output?
A 150 pF capacitor on the CT pin yields approximately 200 kHz switching frequency at 1.7 V output and light load, based on the ADP3159JRU-REEL7's 150 µA CT charge current and 3.0 V threshold. The off-time remains fixed at ~3.5–4.5 µs (per datasheet), so actual frequency decreases slightly under heavy load or higher VOUT due to parasitic voltage drops - confirming 150 pF as the validated value for nominal VRM 8.4 operation.
ADP3159JRU-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- -
- Frequency - Switching:
- -
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Frequency Control, Power Good, Reset
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
ADP3159JRU-REEL7 FAQ
1.How can I place an order for ADP3159JRU-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP3159JRU-REEL7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADP3159JRU-REEL7 reliable?
The price and inventory of ADP3159JRU-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP3159JRU-REEL7 is usually 5 days.
3.What payment methods are accepted for ADP3159JRU-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP3159JRU-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP3159JRU-REEL7?
ADP3159JRU-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP3159JRU-REEL7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADP3159JRU-REEL7?
For technical support, including ADP3159JRU-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP3159JRU-REEL7 requirements.
6.How does Aetrix verify that ADP3159JRU-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADP3159JRU-REEL7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADP3159JRU-REEL7 meets industry standards.
7.What is the process for return or replacement of ADP3159JRU-REEL7?
All ADP3159JRU-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADP3159JRU-REEL7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADP3159JRU-REEL7 part is unused and in its original packaging.
Return procedure for ADP3159JRU-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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