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Analog Devices Inc. ADP3161JR
- Part No.:
- ADP3161JR
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADP3161JR.pdf
- Description:
- 4-BIT PROG BUCK CONTROLLER
- Quantity:
- Payment:
- Shipping:
Inventory:16,464
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Product details
Overview
ADP3161JR from Analog Devices is a 4-bit programmable 2-phase synchronous buck controller optimized for Intel Pentium® III core voltage regulation. It delivers 1.3 V to 2.05 V output with 0.8% total accuracy over temperature, active current balancing between phases, and dual logic-level PWM outputs for external high-power drivers. Used in VRM 8.4-compliant desktop PC power supplies.
For engineers reviewing the ADP3161JR datasheet, ADP3161JR pinout, ADP3161JR application, or ADP3161JR equivalent, key selection considerations include its 16-lead narrow-body SOIC package, VID-based voltage programming, ADOPT™ active voltage positioning for transient response, and compatibility with ADP3412/ADP3413/ADP3414 driver ICs.
Technical Context
The ADP3161JR implements a current-mode PWM architecture with antiphase logic outputs, enabling two complementary buck stages operating at half the oscillator frequency set by the CT pin. Its internal 4-bit DAC reads VID codes to program output voltage, while active current balancing ensures equal load sharing even under large transients.
It integrates ADOPT™ (Analog Devices Optimal Positioning Technology) for dynamic voltage positioning-adjusting output voltage as a function of load current to optimize transient response-and includes crowbar overvoltage protection, power-good monitoring, and cycle-by-cycle current limiting with foldback during short-circuit events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 1.3 V to 2.05 V, digitally programmable via 4-bit VID code per VRM 8.4 spec |
| Total Output Accuracy | ±0.8% over 0°C to 70°C, including line/load/temp drift and DAC error |
| Switching Frequency | Programmable up to 2 MHz via external CT capacitor; each phase runs at fCT/2 |
| Current Sense Threshold | 69 mV to 89 mV typical, enabling precise peak-current control with external sense resistor |
| Crowbar Protection | Triggers at 114–134% nominal output, resets at 50–70%, with 300 ns response time |
| Power-Good Window | Undervoltage threshold 76–88%, overvoltage threshold 114–134% of nominal output |
| Reference Output | 3.0 V ±1.6% (2.952 V to 3.048 V), rated for ≤1 mA load, used for ADOPT compensation |
Pinout & Package
The ADP3161JR is housed in a 16-lead narrow-body SOIC package (R-16A / SO-16), with exposed pad not present and thermal resistance θJA = 125°C/W on two-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No connect - must remain unconnected per datasheet |
| 2–5 (VID3–VID0) | Voltage Identification Inputs | 4-bit digital interface pulled up internally to REF; sets DAC output voltage (1.3–2.05 V) per Table I |
| 6 (COMP) | Error Amplifier Output | Compensation node for ADOPT loop; voltage programs current comparator threshold |
| 7 (FB) | Feedback Input | Remote-sense input for output voltage regulation; referenced to GND |
| 8 (CT) | Oscillator Timing Input | Connects to external capacitor to set switching frequency (fCT up to 2 MHz) |
| 9 (GND) | Analog Ground Reference | Common return for all internal analog circuitry; must be tied near load ground for remote sensing |
| 10 (PWRGD) | Open-Drain Power-Good Output | Signals valid output when FB is within ±12% to ±16% window; requires external pull-up |
| 11 (CS+) | Current Sense Positive | High-side current sense input; measures voltage drop across shared RSENSE |
| 12 (PWM2) | Phase 2 Logic-Level Driver Output | 180° out-of-phase with PWM1; drives external high-side MOSFET driver (e.g., ADP3412) |
| 13 (PWM1) | Phase 1 Logic-Level Driver Output | Complementary to PWM2; enables interleaved operation for reduced ripple |
| 14 (CS–) | Current Sense Negative | Return path for CS+; forms differential pair for accurate current measurement |
| 15 (REF) | 3.0 V Precision Reference | Stable reference for ADOPT compensation divider and external circuitry; max 1 mA load |
| 16 (VCC) | Main Supply Input | Accepts 5 V or 12 V input; UVLO triggers at 5.9–6.9 V with 0.1–0.6 V hysteresis |
Key Features
| Feature | Design Value |
|---|---|
| ADOPT™ Active Voltage Positioning | Adjusts output voltage dynamically with load current to minimize required output capacitance and maximize transient response margin |
| Active Current Balancing | Ensures equal phase current sharing using single high-side sense resistor, eliminating imbalance from MOSFET RDS(ON) or inductor DCR mismatch |
| Dual Antiphase PWM Outputs | 180° phase-shifted logic-level signals reduce input/output ripple and enable scalable multi-phase designs |
| Integrated Crowbar Protection | Overvoltage shutdown without external components-pulls both PWM outputs low to activate low-side MOSFETs and clamp output |
| VRM 8.4 Compliance | Fully supports Intel Pentium® III voltage identification protocol and dynamic load regulation requirements |
Applications
| Desktop CPU Core Regulation | VRM Module Power Stage |
|---|---|
Use Scenario: Regulating core voltage for Intel Pentium® III processors in desktop PCs requiring tight DC accuracy and fast transient response. IC Role / Device Role / Timing Role: Primary 2-phase synchronous buck controller; reads VID code, generates antiphase PWMs, and manages current balance and protection. Use Value: Enables compliance with VRM 8.4 specification using only one IC and minimal external components-no additional crowbar or current-limit circuitry needed. | Use Scenario: Serving as the control engine in modular VRM solutions for OEM motherboard designs targeting high-current CPU loads. IC Role / Device Role / Timing Role: Central timing and regulation controller coordinating dual-phase power delivery, feedback, and safety functions. Use Value: Reduces total solution size and BOM count by integrating ADOPT™, PWRGD, crowbar, and VID decoding-eliminating need for discrete op-amps or comparators. |
| High-Performance Embedded Processor Supply | Industrial Multi-Core SoC Power |
Use Scenario: Providing tightly regulated, low-noise core supply for embedded x86 or DSP processors in industrial automation controllers. IC Role / Device Role / Timing Role: Dual-phase buck controller delivering stable 1.3–2.05 V output with programmable frequency and robust fault handling. Use Value: Delivers 0.8% output accuracy over 0°C to 70°C and built-in short-circuit foldback-critical for unattended operation in harsh environments. | Use Scenario: Powering multi-core SoCs in network infrastructure equipment where thermal management and ripple suppression are critical. IC Role / Device Role / Timing Role: Interleaved controller managing two independent buck stages to halve ripple current and improve EMI performance. Use Value: Achieves <2.9 mΩ maximum allowable output impedance via active current balancing and ADOPT™-enabling smaller, lower-ESR capacitor banks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2-phase synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6522CRZ | Supports 3-phase operation; uses different VID encoding (5-bit); no integrated crowbar comparator | Targeted at higher-current server CPUs (e.g., Pentium® 4); requires external overvoltage protection | Choose ISL6522CRZ only if 3-phase scalability or wider VID range (0.9–2.5 V) is required; verify crowbar implementation separately. |
| TPS51216RGER | Integrated MOSFET drivers; supports 1–3 phases; uses SMBus interface instead of VID pins | Designed for mobile platforms (Intel Centrino®); lacks ADOPT™ and relies on external compensation | Select TPS51216RGER for space-constrained portable designs needing integrated drivers-but expect higher layout complexity for desktop VRM compliance. |
Compared with ISL6522CRZ and TPS51216RGER, the ADP3161JR offers unique ADOPT™-enabled transient optimization and self-contained crowbar protection, making it optimal for cost-sensitive, VRM 8.4-compliant desktop systems where minimal external components and guaranteed overvoltage safety are mandatory.
Availability
ADP3161JR is available at Aetrix Electronics and suitable for desktop PC power supplies, VRM modules, and high-performance embedded processor supplies requiring stable component supply across commercial temperature range (0°C to 70°C).
Supply support for ADP3161JR 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 ADP3161JR belongs to Analog Devices' CPU power management controller product line, designed specifically for high-efficiency, multi-phase core voltage regulation in Intel-compatible desktop platforms.
FAQ
What is the operating temperature range specified for the ADP3161JR?
The ADP3161JR is specified for operation across the commercial temperature range of 0°C to 70°C, as confirmed in the Ordering Guide and Absolute Maximum Ratings section of the official datasheet. This range applies to ambient conditions during normal functional operation, with junction temperature limited to 125°C. The device is not rated for extended or industrial temperature ranges.
Does the ADP3161JR integrate MOSFET drivers, or does it require external drivers?
The ADP3161JR does not integrate power MOSFET drivers. It provides dual logic-level PWM outputs (PWM1 and PWM2) intended to interface with external high-power drivers such as the ADP3412, ADP3413, or ADP3414. This architecture separates control and power stages, allowing flexible selection of driver strength and thermal management for high-current CPU applications.
How does the ADP3161JR implement active current balancing between its two phases?
The ADP3161JR achieves active current balancing by measuring load current through a single high-side sense resistor (RSENSE) shared between both phases. During each phase's ON-time, the same internal current comparator (CMP1) compares the sensed voltage against a threshold set by the COMP voltage. This eliminates mismatches caused by MOSFET RDS(ON) or inductor DCR differences-ensuring equal current division even under large transients.
What protection features are integrated into the ADP3161JR?
The ADP3161JR integrates multiple protection features: crowbar overvoltage protection (trips at 114–134% nominal output), open-drain power-good monitoring (76–88% UV / 114–134% OV thresholds), cycle-by-cycle current limiting with foldback during short-circuit events, and UVLO with hysteresis (6.4 V nominal trip, 0.1–0.6 V hysteresis). All operate without external components.
Can the ADP3161JR be used with processors other than Intel Pentium® III?
The ADP3161JR is VRM 8.4–compliant and designed explicitly for Intel Pentium® III processors, supporting their 4-bit VID code format (1.3 V to 2.05 V). While it may function with other processors using identical VID encoding and voltage range, compatibility is not guaranteed for non-Pentium® III devices. For newer architectures (e.g., Pentium® 4 or Core series), Analog Devices recommends alternative controllers like the ADP3165 or ISL6522.
ADP3161JR 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:
- PWM
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 5V, 12V
- Frequency - Switching:
- Up to 2MHz
- Duty Cycle (Max):
- 50%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- -
- Serial Interfaces:
- -
- Control Features:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
ADP3161JR FAQ
1.How can I place an order for ADP3161JR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP3161JR 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 ADP3161JR reliable?
The price and inventory of ADP3161JR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP3161JR is usually 5 days.
3.What payment methods are accepted for ADP3161JR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP3161JR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP3161JR?
ADP3161JR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP3161JR 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 ADP3161JR?
For technical support, including ADP3161JR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP3161JR requirements.
6.How does Aetrix verify that ADP3161JR is sourced from the original manufacturer or authorized distributors?
All ADP3161JR 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 ADP3161JR meets industry standards.
7.What is the process for return or replacement of ADP3161JR?
All ADP3161JR units undergo pre-shipment inspection (PSI). If there is an issue with ADP3161JR, 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 ADP3161JR part is unused and in its original packaging.
Return procedure for ADP3161JR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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