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Analog Devices Inc. ADP3161JR-REEL7
- Part No.:
- ADP3161JR-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADP3161JR-REEL7.pdf
- Description:
- 4-BIT PROG BUCK CONTROLLER
- Quantity:
- Payment:
- Shipping:
Inventory:4,000
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Product details
Overview
ADP3161JR-REEL7 from Analog Devices is a 4-bit programmable, dual-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 ADOPT™ active voltage positioning for superior transient response in VRM 8.4-compliant desktop CPU power supplies.
For engineers reviewing the ADP3161JR-REEL7 datasheet, ADP3161JR-REEL7 pinout, ADP3161JR-REEL7 application, or ADP3161JR-REEL7 equivalent, key selection criteria include VRM 8.4 compliance, dual-phase logic-level PWM outputs (180° out-of-phase), crowbar overvoltage protection, 16-pin SOIC package, and VID-based digital voltage programming.
Technical Context
The ADP3161JR-REEL7 implements a fixed-frequency current-mode PWM architecture with antiphase logic outputs driving external high-power drivers (e.g., ADP3412). Its internal 4-bit DAC reads VID inputs to set output voltage, while ADOPT™ technology dynamically adjusts regulation point based on load current to minimize required output capacitance.
It features high-side current sensing via shared CS+/CS– pins, active per-phase current balancing, cycle-by-cycle current limiting, and integrated crowbar protection that forces both PWM outputs low during overvoltage events. The device operates across 0°C to 70°C and uses an external CT capacitor to set oscillator frequency up to 2 MHz.
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 - ensures stable core voltage under thermal stress |
| Oscillator Frequency | Up to 2000 kHz (set by external CT capacitor) - enables optimization of efficiency vs. filter size |
| PWM Phase Relationship | 180° out-of-phase dual outputs - reduces input/output ripple and improves current sharing |
| Crowbar Protection | Triggers at 114–134% nominal output - clamps overvoltage without external components to protect CPU |
| Power-Good Threshold | 76–88% (UV) and 114–134% (OV) of nominal - provides reliable system reset signaling |
| Reference Output | 3.0 V ±1.6% (2.952 V to 3.048 V) - used for ADOPT compensation and external circuitry |
Pinout & Package
ADP3161JR-REEL7 is housed in a 16-lead narrow-body SOIC package (R-16A / SO-16), RoHS-compliant and rated for 0°C to 70°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VID0–VID3 | Voltage ID input bits | Directly program output voltage (1.3 V–2.05 V) per Table I; internally pulled up to 4.5–5.5 V reference |
| FB | Feedback input | Remote-sense node for closed-loop regulation; referenced to GND near load for accuracy |
| COMP | Error amplifier output | Compensation point for ADOPT loop; sets current comparator threshold and enables voltage positioning |
| CT | Oscillator timing input | Connects to ground via external capacitor to set switching frequency (e.g., 150 pF → 400 kHz oscillator → 200 kHz per phase) |
| PWM1 / PWM2 | Logic-level phase drivers | Antiphase outputs (180° offset); drive external high-side/low-side drivers (e.g., ADP3412), not MOSFETs directly |
| CS+ / CS– | High-side current sense inputs | Shared sense node for both phases; enables accurate active current balancing and cycle-by-cycle limiting |
| PWRGD | Open-drain power-good | Signals valid output voltage range (76–88% UV / 114–134% OV); requires external pull-up |
| REF | 3.0 V reference output | Stable 3.0 V ±1.6% source for compensation network; max 300 µA load |
| VCC / GND | Supply and ground | VCC = 5 V or 12 V main rail; UVLO triggers at 5.9–6.9 V with 0.1–0.6 V hysteresis |
Key Features
| Feature | Design Value |
|---|---|
| ADOPT™ Active Voltage Positioning | Dynamically adjusts output voltage vs. load current to optimize transient response and minimize required output capacitance |
| Active Current Balancing | Ensures equal current sharing between both phases under steady-state and large transients using single high-side sense resistor |
| Integrated Crowbar Protection | Hardware-level overvoltage clamp (114–134% trip) that forces PWM outputs low without external components |
| VRM 8.4 Compliance | Fully supports Intel Pentium® III voltage identification protocol and dynamic regulation requirements |
| Dual Antiphase PWM Outputs | 180° phase-shifted logic-level signals reduce ripple, improve thermal distribution, and enable scalable multi-phase designs |
Applications
| Desktop CPU Core Power Supply | VRM Module |
|---|---|
Use Scenario: Regulating core voltage for Intel Pentium® III processors in ATX desktop motherboards with 5 V or 12 V input rails. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing two complementary power stages with VID-based voltage setting and ADOPT™ transient compensation. Use Value: Enables <2.05 V output with ±0.8% accuracy and fast load-step response using minimal output capacitance per VRM 8.4 spec. | Use Scenario: Integrated into compact, plug-in VRM modules delivering regulated core power to high-performance CPUs in OEM server and workstation platforms. IC Role / Device Role / Timing Role: Primary controller IC providing programmable voltage, phase control, current balancing, and protection functions in modular power solution. Use Value: Reduces module footprint and BOM count via integrated crowbar, PWRGD, REF, and VID decoding - no external DAC or protection ICs needed. |
| High-Current Embedded Processor Supply | Multi-Phase Scalable Power Architecture |
Use Scenario: Powering high-current embedded microprocessors in industrial control systems requiring robust transient immunity and thermal stability. IC Role / Device Role / Timing Role: Dual-phase controller implementing active current sharing and ADOPT™ to maintain tight voltage regulation under rapid load changes. Use Value: Delivers stable 1.3–2.05 V output with <120 mV static tolerance and sub-µs overvoltage response - critical for deterministic real-time operation. | Use Scenario: Serving as one segment in a scalable multi-phase design where multiple ADP3161JR-REEL7 controllers operate in parallel for >50 A applications. IC Role / Device Role / Timing Role: Independent 2-phase controller block synchronized via shared clock or staggered CT networks to distribute load across phases. Use Value: Enables modular, field-upgradable power delivery with consistent per-phase performance, simplified layout, and predictable thermal management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6522CRZ | 6-bit VID (1.1–2.2 V), 3.3 V bias requirement, no integrated REF, different pinout | Targeted at later-generation Pentium 4 VRM 8.5/9.x; lacks ADOPT™ but offers higher resolution | Choose ISL6522CRZ only if wider voltage range and VRM 8.5 compliance are required; verify PCB layout compatibility. |
| TPS51216RGET | Integrated MOSFET drivers, 3.3 V/5 V compatible, supports 0.5–1.5 V output, no crowbar | Designed for mobile CPU core supplies (Intel Core i-series); lower voltage range and no hardware overvoltage clamp | Use TPS51216RGET for portable or low-voltage applications; ADP3161JR-REEL7 remains preferred for desktop VRM 8.4 with crowbar safety. |
Compared with ISL6522CRZ and TPS51216RGET, ADP3161JR-REEL7 uniquely combines VRM 8.4 compliance, ADOPT™ transient optimization, integrated 3.0 V REF, and crowbar protection in a 16-pin SOIC - making it the most direct fit for legacy Pentium III desktop power designs requiring robust overvoltage safety.
Availability
ADP3161JR-REEL7 is available at Aetrix Electronics and suitable for desktop PC power supplies, VRM modules, and high-current embedded processor supplies requiring stable component supply, long-lifecycle support, and guaranteed VRM 8.4 compliance.
Supply support for ADP3161JR-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, headquartered in Norwood, MA.
The ADP3161JR-REEL7 belongs to Analog Devices' VRM-compliant power controller product line, engineered specifically for high-efficiency, tightly regulated core voltage generation in Intel Pentium III–class desktop computing platforms.
FAQ
What is the operating temperature range for ADP3161JR-REEL7?
The ADP3161JR-REEL7 is specified for commercial operation from 0°C to 70°C ambient temperature. Its absolute maximum junction temperature is 125°C, and thermal resistance (θJA) is 125°C/W on a two-layer board. This range aligns with standard desktop motherboard environments where airflow and heatsinking ensure reliable thermal performance for the ADP3161JR-REEL7.
Does ADP3161JR-REEL7 integrate MOSFET drivers or require external drivers?
The ADP3161JR-REEL7 provides logic-level PWM outputs (PWM1/PWM2) only and does not integrate gate drivers. It must be paired with external high-current drivers such as the ADP3412, ADP3413, or ADP3414 to interface with power MOSFETs. This architecture allows flexible driver selection and thermal separation, and is explicitly confirmed in the ADP3161JR-REEL7 functional block diagram and theory of operation section.
How does the crowbar protection function in ADP3161JR-REEL7?
The ADP3161JR-REEL7 crowbar comparator trips when output voltage exceeds 114–134% of nominal (e.g., >2.33 V at 2.05 V setting), forcing both PWM1 and PWM2 outputs low. This turns off high-side MOSFETs and activates low-side devices, pulling output down via inductor reverse current. The crowbar resets when voltage falls below 50–70% nominal. No external components are needed - this hardware-level protection is built into the ADP3161JR-REEL7 die.
Can ADP3161JR-REEL7 support output voltages outside the 1.3 V–2.05 V range?
No - the ADP3161JR-REEL7's internal 4-bit DAC and VID decoding logic are strictly limited to 1.3 V to 2.05 V, as defined in Table I of the datasheet (VID codes 1111 to 0000). Attempts to force voltages outside this range via external feedback will violate regulation accuracy and disable ADOPT™ functionality. For broader ranges, consider alternatives like ISL6522CRZ (1.1–2.2 V) or newer controllers.
What is the purpose of the COMP pin on ADP3161JR-REEL7?
The COMP pin on ADP3161JR-REEL7 serves as the error amplifier output and primary compensation node for the ADOPT™ active voltage positioning loop. It sets the current comparator threshold and interfaces with the external RC network tied to REF and FB. Pulling COMP below 560 mV disables the controller - a feature used for sequencing or fault shutdown. Its voltage directly determines output current capability and transient response behavior in the ADP3161JR-REEL7.
ADP3161JR-REEL7 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-REEL7 FAQ
1.How can I place an order for ADP3161JR-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP3161JR-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 ADP3161JR-REEL7 reliable?
The price and inventory of ADP3161JR-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP3161JR-REEL7 is usually 5 days.
3.What payment methods are accepted for ADP3161JR-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP3161JR-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP3161JR-REEL7?
ADP3161JR-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP3161JR-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 ADP3161JR-REEL7?
For technical support, including ADP3161JR-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP3161JR-REEL7 requirements.
6.How does Aetrix verify that ADP3161JR-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADP3161JR-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 ADP3161JR-REEL7 meets industry standards.
7.What is the process for return or replacement of ADP3161JR-REEL7?
All ADP3161JR-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADP3161JR-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 ADP3161JR-REEL7 part is unused and in its original packaging.
Return procedure for ADP3161JR-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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