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Analog Devices Inc. ADP3158JR
- Part No.:
- ADP3158JR
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADP3158JR.pdf
- Description:
- 4 BIT PROGRAMMABLE SYNCHRONOUS B
- Quantity:
- Payment:
- Shipping:
Inventory:6,941
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Product details
Overview
ADP3158JR 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 16-lead SOIC package.
For engineers reviewing the ADP3158JR datasheet, ADP3158JR pinout, ADP3158JR application, or ADP3158JR equivalent, this device serves as a VRM-compliant, current-mode buck controller with crowbar overvoltage protection, dual linear regulator drivers, and fixed off-time architecture optimized for high-transient-response motherboard power delivery.
Technical Context
The ADP3158JR implements a current-mode, constant off-time control architecture using an external CT capacitor to set switching frequency-typically ~200 kHz at 1.7 V output-and delivers precise regulation via a 4-bit VID DAC with ADOPT™ for dynamic load-line compensation. It senses output current differentially across CS+ and CS– with 69–87 mV threshold and provides error amplifier transconductance of 2.2 mmho.
Its dual linear regulator controllers drive external N-channel MOSFETs with fixed 2.5 V (LR1) and 1.8 V (LR2) feedback references, ±2.5% accuracy, and operate independently during UVLO to meet Intel power sequencing requirements. The crowbar function triggers at 120% nominal DAC voltage and resets at ~50%, protecting microprocessors without external components.
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 spec |
| Total Output Accuracy | ±0.8% over 0°C to 70°C, enabling tight core voltage compliance for Pentium III/Celeron |
| Switching Architecture | Current-mode, constant off-time with external CT capacitor-no slope compensation needed |
| Crowbar Protection | Triggers at 115–125% nominal DAC voltage; resets at 40–60%, eliminating need for external crowbar circuitry |
| Linear Regulator Outputs | Fixed 2.5 V (LR1) and 1.8 V (LR2), each with dedicated FB and gate-drive pins for auxiliary rail generation |
| Package | 16-lead SOIC (R-16A), thermally rated for 125°C junction, compatible with standard PCB reflow |
| UVLO Threshold | 7.0 V ±0.25 V with 1.0 V hysteresis, ensuring clean startup from 12 V supply rails |
Pinout & Package
ADP3158JR is housed in a 16-lead SOIC (R-16A) package with exposed pad not present; thermal resistance θJA = 125°C/W (two-layer board). Pin functions are validated per Analog Devices Rev. A datasheet Figure and PIN FUNCTION DESCRIPTIONS table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VID0–VID3 (Pins 1–4) | Voltage Identification inputs | Read 4-bit processor VID code to set core voltage; internally pulled up to 5.4 V reference |
| CS– / CS+ (Pins 7–8) | Differential current sense inputs | Enable accurate current-mode control and short-circuit protection; CS– also serves as output voltage sense node |
| DRVH / DRVL (Pins 14–15) | High-side / low-side N-MOSFET gates | Drive external synchronous buck FETs with 6 Ω typical output impedance and 80 ns transition time |
| LRFB1 / LRFB2 (Pins 5, 12) | Linear regulator feedback inputs | Set 2.5 V and 1.8 V outputs respectively; high-impedance (0.3–1 µA) for precision divider design |
| LRDRV1 / LRDRV2 (Pins 6, 11) | Linear regulator gate drivers | Source/sink capability to drive external N-MOSFETs for AGP/GTL auxiliary rails |
| COMP (Pin 10) | Error amplifier output | Compensation node for loop stability; 3.0 V max output supports Type II/III compensation networks |
| CT (Pin 16) | Oscillator timing capacitor connection | Off-time set by 150 µA charge current; 200 pF yields ~4 µs off-time (~200 kHz at 1.7 V) |
Key Features
| Feature | Design Value |
|---|---|
| ADOPT™ Active Voltage Positioning | Adjusts output voltage dynamically with load current to minimize required output capacitance and improve transient response beyond passive positioning |
| Integrated Overvoltage Crowbar | Self-contained protection that pulls down core rail via DRVL when VOUT exceeds 120% nominal-no external SCR or comparator needed |
| Dual Linear Regulator Controllers | Independent 2.5 V and 1.8 V regulators with dedicated FB/DRV pins, enabling AGP, GTL+, and other motherboard auxiliary rails |
| VID-Compatible 4-Bit DAC | Direct interface to Pentium III/Celeron VID bus; supports all 16 codes from 1.30 V to 2.05 V in 50 mV steps per Table I |
| Robust Current Sensing | Differential CS+/CS– inputs with 35–87 mV programmable threshold range and 50 ns response time for fast fault detection |
Applications
| Desktop CPU Core Power | Intel Motherboard VRM |
|---|---|
Use Scenario: Generating regulated 1.7 V core supply for 750 MHz Pentium III processor under 15 A dynamic load with 20 A/µs di/dt. IC Role / Device Role / Timing Role: Primary synchronous buck controller implementing VRM 8.4 compliance with ADOPT™ load-line positioning and crowbar safety. Use Value: Enables <210 mV transient deviation using only five Rubycon ZA-series output capacitors (ESR <5 mΩ), reducing BOM count vs. non-ADOPT solutions. | Use Scenario: Powering multiple auxiliary rails (AGP 1.8 V, GTL+ 2.5 V) while maintaining strict Intel power sequencing during 5 VSB-to-12 V handoff. IC Role / Device Role / Timing Role: Dual linear regulator controller providing independent, high-bandwidth auxiliary supplies synchronized to main buck startup. Use Value: Eliminates need for discrete LDOs or additional controllers-linear regulators remain active during UVLO to track 3.3 V standby rail. |
| Laptop Docking Station PSU | Legacy x86 Embedded System |
Use Scenario: Supporting hot-plug CPU voltage scaling in modular docking stations where core voltage must adapt to different processor SKUs. IC Role / Device Role / Timing Role: VID-programmable buck controller accepting dynamic VID updates from host controller during enumeration. Use Value: 4-bit VID interface allows seamless switching between Celeron (1.65 V) and Pentium III (1.70 V) without firmware or hardware change. | Use Scenario: Providing stable core and I/O rail generation in industrial embedded boards requiring long-lifecycle, commercial-temp support (0°C to 70°C). IC Role / Device Role / Timing Role: Single-chip VRM solution with integrated protection and sequencing-reducing component count and layout complexity. Use Value: SOIC packaging and 125°C junction rating ensure reliability in convection-cooled enclosures; no external crowbar or sequencing ICs 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 | Same pinout and architecture, but linear regulator outputs are adjustable via external resistor dividers (not fixed 2.5 V/1.8 V) | Suitable when auxiliary rail voltages differ from ADP3158JR's fixed values (e.g., 3.3 V AGP or 1.5 V I/O) | Select ADP3178JR if system requires flexible linear regulator outputs; otherwise ADP3158JR offers simpler BOM for standard 2.5 V/1.8 V rails. |
| ISL6522CRZ | Intersil VRM8.5-compliant controller with 6-bit VID, higher accuracy (±0.5%), but no integrated linear regulator controllers | Requires external LDOs or regulators for auxiliary rails; targets higher-end Pentium 4 platforms | Choose ISL6522CRZ only if 6-bit VID resolution and tighter accuracy are mandatory and auxiliary rail generation is handled separately. |
Compared with ADP3158JR, ADP3178JR provides identical buck control with configurable linear regulators-ideal for non-standard auxiliary voltages-while ISL6522CRZ offers enhanced VID resolution and accuracy but increases system complexity by requiring external auxiliary regulation circuitry.
Availability
ADP3158JR is available at Aetrix Electronics and suitable for desktop motherboard design, Intel VRM-compliant power supplies, and legacy x86 embedded systems requiring stable component supply and long-term lifecycle support.
Supply support for ADP3158JR 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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, communications, and power management.
The ADP3158JR belongs to Analog Devices' VRM-compliant power controller product line, designed specifically for high-efficiency, transient-optimized core voltage regulation in Intel Pentium III and Celeron-based computing platforms.
FAQ
What is the primary function of the ADP3158JR in a motherboard power system?
The ADP3158JR serves as the main synchronous buck controller for generating the CPU core voltage in Intel Pentium III and Celeron systems. It reads the processor's 4-bit VID code to set output voltage between 1.3 V and 2.05 V, implements ADOPT™ active voltage positioning for optimal transient response, and integrates two linear regulator controllers for auxiliary rails (2.5 V and 1.8 V). Its crowbar protection and current-mode architecture ensure robust, VRM-compliant operation without external protection components.
Does the ADP3158JR require external components to implement overvoltage protection?
No, the ADP3158JR includes a fully integrated overvoltage crowbar function that activates when the core output exceeds 115–125% of its nominal VID-set voltage. It pulls down the output by driving DRVL high, using the low-side MOSFET as a crowbar switch-no external SCR, comparator, or latch is required. The crowbar resets automatically when voltage falls to 40–60% of nominal, enabling self-recovery after fault clearance.
How does the ADP3158JR support Intel power sequencing requirements during system startup?
The ADP3158JR supports Intel sequencing by keeping its linear regulator controllers (LR1/LR2) active even when the main buck controller is in UVLO-ensuring 2.5 V and 1.8 V auxiliary rails track the 3.3 V standby supply before main 12 V rises. Once VCC exceeds the 7.0 V UVLO threshold, the buck regulator initiates soft-start. This behavior, confirmed in the datasheet's THEORY OF OPERATION section, meets Intel VRM 8.4 sequencing mandates without external timers or supervisors.
What is the role of the CT pin on the ADP3158JR, and how is it configured?
On the ADP3158JR, the CT pin connects to an external capacitor that sets the constant off-time of the buck converter. A 150 µA internal current charges CT until it reaches 3.0 V, defining the off-time (e.g., 200 pF yields ~4 µs off-time). This directly determines operating frequency, which varies inversely with input-to-output voltage ratio. The CT capacitor must be placed close to the pin with low-ESR characteristics; typical values range from 100 pF to 470 pF depending on target frequency and VIN/VOUT conditions.
Can the ADP3158JR be used with processors other than Intel Pentium III and Celeron?
The ADP3158JR is specifically designed for Intel Pentium III and Celeron processors per VRM 8.4 specifications, including VID code mapping (Table I), ADOPT™ load-line behavior, and crowbar thresholds aligned to Intel core voltage tolerances. While its 1.3–2.05 V range and 4-bit VID interface may technically support other CPUs with identical VID protocols, Analog Devices qualifies and characterizes the ADP3158JR exclusively for those two families-no official support exists for AMD, VIA, or later-generation Intel processors.
ADP3158JR 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):
- -
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
ADP3158JR FAQ
1.How can I place an order for ADP3158JR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP3158JR 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 reliable?
The price and inventory of ADP3158JR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP3158JR is usually 5 days.
3.What payment methods are accepted for ADP3158JR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP3158JR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP3158JR?
ADP3158JR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP3158JR 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?
For technical support, including ADP3158JR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP3158JR requirements.
6.How does Aetrix verify that ADP3158JR is sourced from the original manufacturer or authorized distributors?
All ADP3158JR 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 meets industry standards.
7.What is the process for return or replacement of ADP3158JR?
All ADP3158JR units undergo pre-shipment inspection (PSI). If there is an issue with ADP3158JR, 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 part is unused and in its original packaging.
Return procedure for ADP3158JR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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