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Analog Devices Inc. ADP3155JRU-REEL
- Part No.:
- ADP3155JRU-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADP3155JRU-REEL.pdf
- Description:
- IC PS TRPL PENTIUM III 20-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:97,500
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Product details
Overview
ADP3155JRU-REEL from Analog Devices is a 5-bit programmable triple power supply controller optimized for Pentium III and AMD-K6 processor core voltage regulation. It implements active voltage positioning, VRM 8.2/8.3/8.4 compliance, ±5% power-good window, and integrated overvoltage crowbar protection. It drives dual N-channel MOSFETs in synchronous buck topology with 1.3 V to 3.5 V digitally set output.
For engineers reviewing the ADP3155JRU-REEL datasheet, ADP3155JRU-REEL pinout, ADP3155JRU-REEL application, or ADP3155JRU-REEL equivalent, this page delivers verified technical context, real-world transient response data, confirmed TSSOP-20 package mapping, and two validated alternative controllers for VRM-compliant desktop motherboard designs.
Technical Context
The ADP3155JRU-REEL uses a current-mode, constant-off-time architecture with external CT capacitor programming (e.g., 150 pF sets tOFF = 1.8–3.2 µs). Its internal 5-bit DAC reads VID0–VID4 to set SENSE– reference between 1.3 V and 3.5 V, enabling precise core voltage tracking per Intel VRM specifications.
It integrates two linear regulator controllers (VLDO1/VLDO2) for auxiliary AGP/GTL rails, supports active voltage positioning with gain/offset adjustment, and provides crowbar protection triggered at +9% to +24% over nominal output-no external components required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 1.3 V to 3.5 V, digitally programmed via 5-bit VID code; enables dynamic CPU voltage scaling per VRM 8.x spec. |
| Output Accuracy | ±1% at 1.3 V/2.0 V/3.5 V outputs over temperature; ensures compliance with Pentium III static tolerance limits (±100 mV). |
| Power Good Window | ±5% regulation band with 500 µs delay; signals stable core voltage to motherboard logic before CPU release. |
| Crowbar Threshold | +9% to +24% over nominal output; triggers immediate low-side MOSFET turn-on to protect microprocessor during overvoltage fault. |
| Off-Time Control | Programmable via CT pin (65 µA discharge current); 150 pF yields 1.8–3.2 µs off-time, setting operating frequency near 200 kHz at 2.8 V. |
| Linear Regulator Outputs | Two independent controllers (VLDO1/VLDO2); each supports externally set voltages (e.g., 3.3 V @ 1 A with R3=R5=20 kΩ, R4=R6=35 kΩ). |
| Package | TSSOP-20; surface-mount, 0.65 mm pitch, thermally enhanced for high-current VRM applications on dense PCBs. |
Pinout & Package
TSSOP-20 package with exposed thermal pad (RU-20 option); 6.5 mm × 4.4 mm footprint, 1.1 mm max height; designed for automated reflow assembly and thermal dissipation in high-density VRM modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VID0–VID4 (Pins 1–4, 20) | Voltage Identification DAC inputs | Read 5-bit processor VID code; open pins = logic high; all five open = shutdown mode. |
| SENSE– (Pin 9) | Output voltage sense reference | Connects to resistor divider midpoint; sets regulation point for buck output and active voltage positioning loop. |
| SENSE+ (Pin 10) | Current comparator positive input | Senses inductor current via external sense resistor; enables cycle-by-cycle current limiting and short-circuit protection. |
| DRIVE1 (Pin 18) | High-side N-MOSFET gate driver | Swings 0 V to VCC (12 V typical); drives buck switch with 120–200 ns transition time into 7000 pF load. |
| DRIVE2 (Pin 17) | Low-side N-MOSFET gate driver | Swings 0 V to VCC; enables synchronous rectification and crowbar function activation. |
| PWRGD (Pin 15) | Open-drain power-good indicator | Asserts high after output stabilizes within ±5% for ≥500 µs; interfaces directly with motherboard reset logic. |
| VLDO1 / VLDO2 (Pins 8, 13) | Linear regulator gate drivers | Drive external N-MOSFETs for AGP/GTL/other auxiliary rails; support fast load-transient response. |
| FB1 / FB2 (Pins 7, 14) | Linear regulator feedback inputs | Accept resistor-divider voltage from auxiliary rail outputs; set target voltage independently of main buck output. |
Key Features
| Feature | Design Value |
|---|---|
| Active Voltage Positioning | Adjusts output voltage dynamically vs. load current to minimize required output capacitance while meeting VRM transient specs (±130 mV @ 30 A/µs). |
| VRM 8.2/8.3/8.4 Compliance | Fully satisfies Intel's core voltage accuracy, transient response, power-good timing, and crowbar requirements without external compensation. |
| Dual Linear Regulator Controllers | Enable efficient generation of 1.5 V, 1.8 V, 2.5 V, or 3.3 V auxiliary rails using external N-MOSFETs-critical for ACPI-compliant standby operation. |
| Integrated Overvoltage Crowbar | Triggers at +9% to +24% over nominal output; pulls down core rail using low-side MOSFET-no external SCR or protection IC needed. |
| Constant Off-Time Architecture | Eliminates need for slope compensation; provides inherent stability across input/output voltage ratios and simplifies inductor selection. |
Applications
| Desktop PC Core Power Supply | VRM Module for Pentium III |
|---|---|
|
Use Scenario: Mainboard delivering regulated core voltage to Intel Pentium III processors under dynamic load conditions (0.8 A to 14.2 A). IC Role / Device Role / Timing Role: Primary buck controller implementing VID decoding, active voltage positioning, and crowbar protection. Use Value: Meets VRM 8.4 ±100 mV static and ±130 mV transient tolerance with minimal output capacitance (e.g., six 2700 µF FA caps). |
Use Scenario: Compact, plug-in VRM module used in OEM motherboard designs requiring drop-in compatibility with Intel reference layouts. IC Role / Device Role / Timing Role: Integrated triple-output controller managing core, AGP, and GTL rails from single 5 V/12 V input. Use Value: Reduces BOM count by integrating two linear regulators and eliminating discrete crowbar circuitry-enabling RU-20 TSSOP footprint. |
| AMD-K6 Processor Power | ACPI-Compliant Standby Power |
|
Use Scenario: Power delivery for AMD-K6 CPUs in legacy desktop systems requiring VRM 8.2–compliant voltage regulation. IC Role / Device Role / Timing Role: Core voltage controller with programmable 1.3 V–3.5 V range and VID interface compatible with K6 voltage ID protocols. Use Value: Supports full VID code table (32 entries) including shutdown state (VID = 11111), ensuring safe boot and thermal shutdown behavior. |
Use Scenario: Maintaining auxiliary rail operation (e.g., 1.5 V GTL, 3.3 V AGP) during ATX standby mode when only 5 VSB is available. IC Role / Device Role / Timing Role: Dual linear regulator controller powered via charge-pump-doubled 5 VSB, sustaining standby functionality without 12 V rail. Use Value: Enables seamless transition between active and standby states using same IC-no secondary controller required for low-power retention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar VRM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6522CRZ | Single-phase VRM 8.5 controller; supports up to 25 A; includes digital soft-start and telemetry reporting not present in ADP3155JRU-REEL. | Targets newer Pentium 4 platforms; lacks dual linear regulator controllers-requires separate LDOs for auxiliary rails. | Choose ISL6522CRZ when upgrading to VRM 8.5 compliance or needing current telemetry; retain ADP3155JRU-REEL for cost-sensitive VRM 8.2–8.4 designs with integrated aux supplies. |
| RT9173AGQW | Single-output synchronous buck controller; no VID interface; fixed 1.5 V/1.8 V/2.5 V options; no crowbar or linear regulator controllers. | Designed for embedded or non-Intel applications; cannot replace ADP3155JRU-REEL in Pentium/AMD desktop VRMs due to missing VID and triple-output capability. | Consider RT9173AGQW only for simple, fixed-voltage DC/DC stages where VID, crowbar, and auxiliary rails are unnecessary. |
Compared with ISL6522CRZ and RT9173AGQW, the ADP3155JRU-REEL uniquely combines VID-programmable core regulation, integrated crowbar protection, and dual linear regulator control in a single TSSOP-20 package-making it irreplaceable for legacy VRM 8.2–8.4 motherboard designs requiring minimal component count and proven reliability.
Availability
ADP3155JRU-REEL is available at Aetrix Electronics and suitable for desktop motherboard development, VRM module manufacturing, and AMD/Intel legacy platform repair requiring stable component supply and long-term lifecycle support.
Supply support for ADP3155JRU-REEL 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and computing markets since 1965.
The ADP3155JRU-REEL belongs to Analog Devices' VRM power controller product line, engineered specifically for Intel and AMD desktop processor voltage regulation with emphasis on transient response, integration, and VRM specification compliance.
FAQ
What is the primary function of the ADP3155JRU-REEL in a desktop motherboard?
The ADP3155JRU-REEL serves as the core voltage regulator controller for Pentium III and AMD-K6 processors. It decodes the 5-bit VID signal to set output voltage between 1.3 V and 3.5 V, implements active voltage positioning for optimal transient response, and provides integrated crowbar protection-all within a single TSSOP-20 package. The ADP3155JRU-REEL also manages two auxiliary linear regulator rails for AGP and GTL circuits.
Does the ADP3155JRU-REEL support VRM 8.4 compliance?
Yes, the ADP3155JRU-REEL is explicitly specified as VRM 8.2-, 8.3-, and 8.4-compliant in its official documentation. It meets all key requirements including ±1% output accuracy over temperature, ±5% power-good window with 500 µs delay, active voltage positioning for transient response, and crowbar protection triggering at +9% to +24% over nominal output-fully satisfying Intel's VRM 8.4 specification.
How does the crowbar protection in the ADP3155JRU-REEL work?
The ADP3155JRU-REEL's crowbar protection activates when the sensed output voltage exceeds the nominal programmed value by +9% to +24%. Upon detection, it forces DRIVE2 high to fully turn on the low-side N-channel MOSFET, effectively shorting the output to ground through the MOSFET's RDS(ON). This rapidly collapses the core voltage and protects the microprocessor. The crowbar releases when output falls to ~50% of nominal, allowing recovery if the fault is cleared.
Can the ADP3155JRU-REEL generate auxiliary voltages like 1.5 V or 3.3 V?
Yes, the ADP3155JRU-REEL includes two dedicated linear regulator controllers (VLDO1 and VLDO2) that drive external N-channel MOSFETs. By connecting appropriate resistor dividers to FB1 and FB2, designers can set auxiliary outputs such as 1.5 V for GTL, 1.8 V for Southbridge, or 3.3 V for AGP-each supporting up to 1 A with high bandwidth transient response. This eliminates the need for separate LDO ICs in VRM designs.
What package type is used for the ADP3155JRU-REEL?
The ADP3155JRU-REEL is packaged in a 20-lead Thin Shrink Small Outline Package (TSSOP), designated RU-20 by Analog Devices. It features a 6.5 mm × 4.4 mm body, 0.65 mm lead pitch, and an exposed thermal pad for enhanced heat dissipation-optimized for high-current VRM applications on space-constrained motherboard layers.
ADP3155JRU-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Applications:
- -
- Voltage - Input:
- 12V
- Number of Outputs:
- 5
- Voltage - Output:
- 1.3 ~ 3.5V
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
ADP3155JRU-REEL FAQ
1.How can I place an order for ADP3155JRU-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP3155JRU-REEL 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 ADP3155JRU-REEL reliable?
The price and inventory of ADP3155JRU-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP3155JRU-REEL is usually 5 days.
3.What payment methods are accepted for ADP3155JRU-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP3155JRU-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP3155JRU-REEL?
ADP3155JRU-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP3155JRU-REEL 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 ADP3155JRU-REEL?
For technical support, including ADP3155JRU-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP3155JRU-REEL requirements.
6.How does Aetrix verify that ADP3155JRU-REEL is sourced from the original manufacturer or authorized distributors?
All ADP3155JRU-REEL 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 ADP3155JRU-REEL meets industry standards.
7.What is the process for return or replacement of ADP3155JRU-REEL?
All ADP3155JRU-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADP3155JRU-REEL, 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 ADP3155JRU-REEL part is unused and in its original packaging.
Return procedure for ADP3155JRU-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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