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Analog Devices Inc. ADP3158JR-REEL
- Part No.:
- ADP3158JR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADP3158JR-REEL.pdf
- Description:
- 4-BIT PROG BUCK CONTROLLER
- Quantity:
- Payment:
- Shipping:
Inventory:12,500
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Product details
Overview
ADP3158JR-REEL from Analog Devices is a 4-bit programmable synchronous buck controller for Intel Pentium III and Celeron core voltage regulation, delivering 1.3 V to 2.05 V output with ±0.8% total accuracy over temperature, active voltage positioning (ADOPT™), and integrated overvoltage crowbar protection. It drives two external N-channel MOSFETs in constant off-time current-mode operation and includes dual fixed-output linear regulator controllers (2.5 V and 1.8 V).
For engineers reviewing the ADP3158JR-REEL datasheet, ADP3158JR-REEL pinout, ADP3158JR-REEL application, or ADP3158JR-REEL equivalent, this page provides verified technical context, confirmed pin functions, real-world transient response behavior, exact VID-to-voltage mapping, and validated alternative options for VRM 8.4-compliant motherboard designs.
Technical Context
The ADP3158JR-REEL implements a current-mode, constant off-time control architecture with programmable switching frequency via external CT capacitor (e.g., 150 pF yields ~200 kHz at 1.7 V). Its ADOPT™ technology dynamically adjusts output voltage as a function of load current to optimize transient response without requiring additional output capacitance.
It integrates a 4-bit VID DAC (supporting 16 discrete voltages from 1.30 V to 2.05 V), dual linear regulator controllers with internal 2.5 V/1.8 V references, and a crowbar circuit that triggers at 115–125% of nominal DAC voltage and resets at 40–60%, all within a single 16-pin SOIC package operating from 0°C to 70°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 1.30 V to 2.05 V in 16 discrete steps via VID0–VID3; enables precise compliance with Intel VRM 8.4 core voltage requirements. |
| Total Output Accuracy | ±0.8% over temperature; ensures stable processor operation under thermal stress without recalibration. |
| Crowbar Trip Point | 115–125% of nominal DAC voltage; protects microprocessors from overvoltage damage without external components. |
| Linear Regulator Outputs | Fixed 2.5 V (LR1) and 1.8 V (LR2); supports AGP/GTL auxiliary rails with ±2.5% accuracy and high-bandwidth transient response. |
| Operating Temperature | 0°C to 70°C ambient; validated for commercial motherboard environments with no derating required. |
| Package | 16-lead SOIC (R-16A); compatible with standard surface-mount assembly and thermal management on two-layer PCBs (θJA = 125°C/W). |
| UVLO Threshold | 6.75 V to 7.25 V with 0.8–1.2 V hysteresis; prevents erratic startup during brown-out conditions. |
Pinout & Package
ADP3158JR-REEL is housed in a 16-lead SOIC (R-16A) package with exposed pad not present; thermal performance rated at θJA = 125°C/W on two-layer board and 81°C/W on four-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VID0–VID3 (Pins 1–4) | Voltage Identification DAC inputs | Read 4-bit code from CPU to set output voltage; internally pulled up to 5.0–5.7 V reference, logic high if left open. |
| LRFB1 / LRFB2 (Pins 5, 12) | Linear regulator feedback inputs | High-impedance sense nodes for 2.5 V and 1.8 V regulators; enable accurate closed-loop regulation with external resistive dividers only if used in ADP3178 variant. |
| LRDRV1 / LRDRV2 (Pins 6, 11) | Linear regulator gate drivers | Drive external N-channel MOSFETs for auxiliary rails; output swings from GND to VCC with 6 Ω typical drive strength. |
| CS– / CS+ (Pins 7, 8) | Current sense differential inputs | Monitor inductor current via external sense resistor; CS– also serves as output voltage feedback node for error amplifier. |
| CT (Pin 9) | Oscillator timing capacitor connection | Sets constant off-time (3.5–4.5 µs typ.) via external capacitor; determines switching frequency inversely with input/output voltage ratio. |
| COMP (Pin 10) | Error amplifier output & compensation node | Programs current comparator threshold; requires external RC network for loop stability and ADOPT™ tuning. |
| VCC (Pin 13) | Main supply input | Accepts 4.5 V to 12.6 V; powers internal bias, drivers, and regulators; diode-OR'd with 5 VSB/12 V for sequencing. |
| DRVL / DRVH (Pins 14, 15) | Low-side / high-side MOSFET drivers | Drive external N-MOSFET gates with 6 Ω output resistance and 80 ns transition time into 3000 pF load. |
| GND (Pin 16) | Power ground reference | Low-impedance return path for synchronous rectifier source; must connect directly to MOSFET source plane to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| ADOPT™ Active Voltage Positioning | Adjusts output voltage vs. load current to maintain optimal transient margin; reduces required output capacitance by up to 50% vs. passive positioning. |
| Integrated Overvoltage Crowbar | Triggers DRVL high when output exceeds 115–125% of DAC-set voltage; releases at 40–60%, protecting CPU without external circuitry. |
| Dual Linear Regulator Controllers | Provide fixed 2.5 V and 1.8 V auxiliary rails with independent feedback and gate drive; remain active during UVLO for proper power sequencing. |
| VID-Based Programmability | Directly reads 4-bit CPU voltage ID code to set 1.30–2.05 V output in 50 mV steps; eliminates need for external DAC or microcontroller. |
| Constant Off-Time Current Mode | Enables stable operation without slope compensation; switching frequency varies naturally with VIN/VOUT ratio, simplifying EMI filtering. |
Applications
| Desktop CPU Core Supply | AGP/GTL Auxiliary Power |
|---|---|
Use Scenario: Generating core voltage for Intel Pentium III and Celeron processors on ATX motherboards per VRM 8.4 specification. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing 15 A peak load with <210 mV transient deviation under 20 A/µs di/dt. Use Value: Achieves ±0.8% output accuracy and ADOPT™-enabled transient response with only five Rubycon ZA-series output capacitors (ESR <5 mΩ). | Use Scenario: Providing stable 2.5 V AGP and 1.8 V GTL reference rails on same motherboard as CPU core supply. IC Role / Device Role / Timing Role: Dual linear regulator controller driving external N-MOSFETs with high bandwidth to meet Intel sequencing timing windows. Use Value: Eliminates need for separate LDO ICs; maintains regulation during VCC brown-out and tracks 3.3 V supply during startup. |
| VRM-Compliant Motherboard | Legacy x86 Platform Power |
Use Scenario: Implementing full VRM 8.4 solution including core, AGP, and GTL rails with single-controller integration. IC Role / Device Role / Timing Role: Central power management IC coordinating switching regulator and linear regulators with shared VID interface and sequencing logic. Use Value: Reduces BOM count by two ICs versus discrete solutions; supports simultaneous power-on of all rails within Intel-specified tolerances. | Use Scenario: Upgrading legacy Socket 370 platforms requiring backward-compatible core voltage regulation. IC Role / Device Role / Timing Role: Drop-in replacement for earlier VRM controllers with identical pinout and VID protocol support. Use Value: Maintains compatibility with existing BIOS VID tables and motherboard layout; no firmware or hardware revision required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADP3178JR-REEL | Same pinout and core architecture, but linear regulator outputs are adjustable via external resistor dividers instead of fixed 2.5 V/1.8 V. | Used where flexible auxiliary rail voltages (e.g., 3.3 V, 2.5 V, 1.5 V) are needed beyond standard AGP/GTL specs. | Select ADP3178JR-REEL only if variable linear regulator outputs are required; ADP3158JR-REEL is preferred for cost-sensitive VRM 8.4 designs with fixed auxiliary rails. |
| ISL6522CRZ-T | Intersil VRM 8.5 controller with 5-bit VID, higher accuracy (±0.5%), and integrated MOSFET drivers rated for 3 A peak gate current. | Targets newer Pentium 4 platforms requiring tighter voltage tolerance and faster transient response than VRM 8.4 allows. | Choose ISL6522CRZ-T only for VRM 8.5 compliance; ADP3158JR-REEL remains optimal for VRM 8.4 systems due to lower gate drive current demand and proven ADOPT™ transient performance. |
Compared with ADP3178JR-REEL, ADP3158JR-REEL offers lower system cost and simpler design for fixed-rail applications, while ISL6522CRZ-T provides enhanced precision and VRM 8.5 readiness at the expense of increased complexity and component count.
Availability
ADP3158JR-REEL is available at Aetrix Electronics and suitable for desktop motherboard manufacturing, VRM-compliant power supply design, and legacy x86 platform upgrades requiring stable component supply and long-term lifecycle support.
Supply support for ADP3158JR-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The ADP3158JR-REEL belongs to Analog Devices' VRM controller product line, designed specifically for Intel-compatible CPU core voltage regulation with emphasis on transient response, integration, and compliance with VRM 8.4 specifications.
FAQ
What is the primary function of the ADP3158JR-REEL in a motherboard power system?
The ADP3158JR-REEL serves as the main synchronous buck controller for generating the CPU core voltage in Intel Pentium III and Celeron-based systems. It reads the processor's 4-bit VID code to set output between 1.30 V and 2.05 V, implements ADOPT™ active voltage positioning for superior transient response, and integrates dual linear regulator controllers for auxiliary rails-all in a single 16-pin SOIC package.
Does the ADP3158JR-REEL require external components to implement overvoltage protection?
No, the ADP3158JR-REEL includes an integrated overvoltage crowbar function that triggers DRVL high when output exceeds 115–125% of the DAC-set voltage. This feature protects the microprocessor without any external components, and the crowbar releases automatically when output falls to 40–60% of nominal voltage.
How does the ADP3158JR-REEL achieve compliance with Intel VRM 8.4 specifications?
The ADP3158JR-REEL meets VRM 8.4 through its 4-bit VID interface (supporting 16 discrete voltages from 1.30 V to 2.05 V), ±0.8% total output accuracy over 0°C to 70°C, ADOPT™-enhanced transient response (<210 mV deviation under 20 A/µs load step), and integrated sequencing for auxiliary rails-verified in the Figure 3 reference design delivering 15 A at 1.7 V.
What are the key differences between ADP3158JR-REEL and ADP3178JR-REEL?
The ADP3158JR-REEL features fixed 2.5 V and 1.8 V linear regulator outputs, while the ADP3178JR-REEL provides adjustable outputs set via external resistor dividers. Both share identical pinout, VID interface, buck controller architecture, and ADOPT™ functionality-but ADP3158JR-REEL is optimized for cost-sensitive VRM 8.4 implementations with standard auxiliary rails.
Can the ADP3158JR-REEL operate with input voltages below 5 V?
No-the ADP3158JR-REEL is designed for 5 V main input (VIN) to the buck stage and requires VCC between 4.5 V and 12.6 V for internal operation. Its UVLO threshold is 6.75–7.25 V, and it relies on diode-OR'd 5 VSB and 12 V supplies for sequencing; operation below 4.5 V on VCC is not supported per Absolute Maximum Ratings.
ADP3158JR-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 4
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 5V, 12V
- Frequency - Switching:
- -
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Frequency Control
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
ADP3158JR-REEL FAQ
1.How can I place an order for ADP3158JR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP3158JR-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 ADP3158JR-REEL reliable?
The price and inventory of ADP3158JR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP3158JR-REEL is usually 5 days.
3.What payment methods are accepted for ADP3158JR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP3158JR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP3158JR-REEL?
ADP3158JR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP3158JR-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 ADP3158JR-REEL?
For technical support, including ADP3158JR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP3158JR-REEL requirements.
6.How does Aetrix verify that ADP3158JR-REEL is sourced from the original manufacturer or authorized distributors?
All ADP3158JR-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 ADP3158JR-REEL meets industry standards.
7.What is the process for return or replacement of ADP3158JR-REEL?
All ADP3158JR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADP3158JR-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 ADP3158JR-REEL part is unused and in its original packaging.
Return procedure for ADP3158JR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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