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Analog Devices Inc. ADP3171JR-REEL7
- Part No.:
- ADP3171JR-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADP3171JR-REEL7.pdf
- Description:
- SYNCHRONOUS BUCK CONTROLLER
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
ADP3171JR-REEL7 from Analog Devices is a synchronous buck controller with dual integrated linear regulator controllers, delivering a fixed 1.2 V main output (±1% accuracy) at up to 15 A, plus two auxiliary regulated outputs (1.5 V and 1.8 V), all in a 14-lead SOIC package. It employs current-mode, constant off-time control for high efficiency, includes overvoltage crowbar protection, power-good signaling, and supports external N-channel MOSFETs for motherboard auxiliary supplies.
For engineers reviewing the ADP3171JR-REEL7 datasheet, ADP3171JR-REEL7 pinout, ADP3171JR-REEL7 application, or ADP3171JR-REEL7 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-chain support details specific to this reel-packaged commercial-grade controller.
Technical Context
The ADP3171JR-REEL7 uses a current-mode, constant off-time architecture where switching frequency varies inversely with input-to-output voltage ratio; off-time is set by an external CT capacitor (e.g., 150 pF yields ~200 kHz at 1.5 V out). Its error amplifier features 2.2 mmho transconductance and 500 kHz –3 dB bandwidth, enabling fast load transient response for CPU auxiliary rails.
It integrates dual linear regulator controllers-LR1 fixed at 1.5 V (±33 mV tolerance), LR2 fixed at 1.8 V (±33 mV)-each driving external N-channel MOSFETs via dedicated gate drivers (LRDRV1/LRDRV2) and high-impedance feedback inputs (LRFB1/LRFB2). Crowbar protection activates at 120% nominal FB voltage (1.44 V) and resets at ~50% (0.6 V), using DRVL to short the output without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage (Buck) | Fixed 1.2 V ±1% over 0°C–70°C - ensures stable core voltage for Pentium III-era chipsets without external resistor programming. |
| Linear Regulator Outputs | LR1 = 1.5 V ±33 mV; LR2 = 1.8 V ±33 mV - provide standby rails compliant with Intel® motherboard specifications without trimming. |
| Crowbar Trip Point | 120% of nominal FB voltage (1.44 V) - triggers immediate DRVL high to protect downstream logic from overvoltage damage. |
| Off-Time Control | Programmable via CT pin (e.g., 4 µs typ. with 200 pF) - sets minimum off-time, determining max switching frequency and enabling optimization for size vs. efficiency. |
| Power-Good Threshold | UVLO at 80% FB (0.96 V), OV at 120% FB (1.44 V), 5% hysteresis - provides reliable system reset signaling during startup and fault conditions. |
| Current Sense Threshold | 78 mV typ. (69–87 mV range) - defines peak inductor current limit; enables accurate 15 A output with proper RSENSE selection (e.g., 7.5 mΩ). |
| Supply Voltage Range | VCC = 4.5 V to 12.6 V - supports direct connection to 5 VSB or 12 V motherboard rails, with UVLO at 7.0 V ±0.25 V. |
Pinout & Package
ADP3171JR-REEL7 is housed in a 14-lead narrow SOIC (R-14) package with standard 1.27 mm pitch and exposed pad not present. Pin 1 is GND; pins are arranged in single-row configuration per JEDEC MS-012.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Low-impedance return path for synchronous MOSFET sources and internal bias - must connect directly to power ground plane. |
| 2 PWRGD | Open-drain power-good indicator | Sinks current when FB is within 75–125% of 1.2 V; used for system enable/disable sequencing with external pull-up. |
| 3 LRFB1 / 11 LRFB2 | Linear regulator feedback inputs | High-impedance (0.3–1 µA) nodes sensing 1.5 V and 1.8 V outputs - enable precise regulation without loading divider networks. |
| 4 LRDRV1 / 10 LRDRV2 | N-channel MOSFET gate drivers | Drive external pass FETs with rail-to-rail swing (GND to VCC); support >1 A peak current for fast LDO turn-on. |
| 5 FB | Main output voltage feedback | Compares remote-sensed output to 1.2 V internal reference; 1.188–1.212 V tolerance enables ±1% system-level accuracy. |
| 6 CS– / 7 CS+ | Differential current sense inputs | Monitor inductor current via external shunt; 50 ns response time enables cycle-by-cycle current limiting and short-circuit protection. |
| 8 CT | Timing capacitor connection | Charged at 150 µA typ.; voltage threshold of 3.0 V determines off-time - sets operating frequency and influences light-load behavior. |
| 9 COMP | Error amplifier output & compensation node | Drives external RC network (e.g., 100 pF) to stabilize loop; 3.0 V max output enables full gate drive range for MOSFETs. |
| 12 VCC | Controller supply input | Accepts 4.5–12.6 V; powers internal bias, drivers, and regulators - may be diode-OR'd from 5 VSB and 12 V for standby operation. |
| 13 DRVL | Low-side synchronous rectifier driver | Swings GND to VCC; used for crowbar function - turns on low-side FET to clamp output during overvoltage faults. |
| 14 DRVH | High-side buck switch driver | Swings GND to VCC; drives gate of main N-MOSFET with 6 Ω typical output resistance for <80 ns transitions. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 1.2 V synchronous buck output | Eliminates external resistor divider, reducing BOM count and improving long-term stability of CPU core voltage rails. |
| Dual integrated linear regulator controllers | Provide 1.5 V and 1.8 V standby supplies without separate ICs - reduces board area and simplifies thermal management on dense motherboards. |
| Overvoltage crowbar protection | Uses DRVL to activate low-side MOSFET at 120% output voltage - protects chipset I/O without requiring external SCR or latch circuitry. |
| Constant off-time current-mode control | Enables stable operation without slope compensation and delivers fast transient response (<10 µs recovery) for dynamic CPU load changes. |
| Power-good output with hysteresis | Provides clean, glitch-free enable signal to downstream logic with 5% hysteresis - prevents false resets during marginal line conditions. |
Applications
| Desktop Motherboard Auxiliary Supply | Pentium III Chipset Power Management |
|---|---|
Use Scenario: Generating 1.2 V core, 1.5 V standby, and 1.8 V I/O rails from 5 V/12 V motherboard supplies. IC Role / Device Role / Timing Role: Primary synchronous buck controller with integrated LDO controllers managing multi-rail sequencing and fault protection. Use Value: Reduces component count by consolidating three regulators into one IC while maintaining ±1% accuracy and crowbar safety. |
Use Scenario: Supporting Intel® Pentium III platform requirements including 3.3 VSB tracking, UVLO coordination, and fast load-step response. IC Role / Device Role / Timing Role: System power manager ensuring linear regulators remain active during VCC UVLO to track 3.3 VSB before buck startup. Use Value: Guarantees correct power-up order and maintains standby functionality even when main 12 V rail is absent. |
| Embedded Industrial Control Board | Legacy Server Board Power Subsystem |
Use Scenario: Delivering tightly regulated auxiliary voltages in fanless industrial PCs operating at 0°C–70°C ambient. IC Role / Device Role / Timing Role: High-reliability DC-DC controller with open-drain PWRGD for PLC watchdog interface and crowbar for field-induced overvoltage events. Use Value: Eliminates need for external OVP ICs and simplifies compliance with IEC 61000-4-5 surge immunity requirements. |
Use Scenario: Replacing aging multi-IC power solutions in enterprise server motherboards requiring long-lifecycle support. IC Role / Device Role / Timing Role: Drop-in upgrade path for ADP316x-family designs - shares pinout, footprint, and control architecture with backward-compatible timing. Use Value: Enables performance uplift (higher current, tighter accuracy) without PCB redesign or firmware changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller with auxiliary LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADP3165JR-REEL7 | Same 14-pin SOIC package; fixed 1.5 V buck output (not 1.2 V); no crowbar; single LDO (1.8 V only) | Lacks 1.2 V core rail and dual-LDO capability - suitable only for non-CPU auxiliary rails where crowbar is unnecessary. | Select if system requires 1.5 V main output and lower cost is prioritized over protection and rail count. |
| TPS51100PWR | TI part in TSSOP-24; adjustable buck output (0.7–5.5 V); no integrated LDOs; requires external MOSFET drivers | Offers programmability and higher integration density but demands additional external components for LDO generation and crowbar. | Select when design flexibility (adjustable VOUT) and smaller footprint outweigh BOM simplicity and integrated protection. |
Compared with ADP3171JR-REEL7, ADP3165JR-REEL7 trades core-voltage precision and dual-LDO convenience for lower cost and simpler layout, while TPS51100PWR shifts complexity to external circuitry to gain output adjustability and packaging efficiency - neither offers the same combination of fixed 1.2 V accuracy, dual-LDO integration, and self-contained crowbar protection.
Availability
ADP3171JR-REEL7 is available at Aetrix Electronics and suitable for desktop motherboard auxiliary supplies, Pentium III chipset power management, and legacy server board power subsystems requiring stable component supply across extended production cycles.
Supply support for ADP3171JR-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 is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial automation, and communications infrastructure.
The ADP3171JR-REEL7 belongs to Analog Devices' power management product line, designed specifically for high-efficiency, multi-rail DC-DC conversion in x86-based computing platforms with stringent accuracy and safety requirements.
FAQ
What is the maximum output current supported by the ADP3171JR-REEL7 buck regulator?
The ADP3171JR-REEL7 supports up to 15 A output current for its fixed 1.2 V buck stage, contingent on thermal design and external component ratings - specifically, the selected N-channel MOSFETs (e.g., FDB6982), inductor saturation current (>8 A), and sense resistor (7.5 mΩ typical). The IC itself does not limit current; it regulates based on sensed voltage across RSENSE, with trip thresholds from 69 mV to 87 mV.
Does the ADP3171JR-REEL7 require external compensation components?
Yes, the ADP3171JR-REEL7 requires an external capacitor (e.g., 100 pF) connected from COMP to GND for loop stabilization. This capacitor sets dominant pole frequency and ensures phase margin >45° across load and line variations. No series resistor is needed - the error amplifier's 2.2 mmho transconductance and 500 kHz bandwidth allow simple single-capacitor compensation.
Can the ADP3171JR-REEL7 generate output voltages other than 1.2 V, 1.5 V, and 1.8 V?
The buck output is fixed at 1.2 V and not adjustable; however, the linear regulator outputs can be scaled higher using external resistor dividers on LRFB1 and LRFB2 pins. For example, a 220 Ω / 249 Ω divider on LRFB1 raises LR1 output to 1.5 VSB per Intel spec. The buck FB pin cannot be reprogrammed - altering its divider invalidates the ±1% accuracy guarantee and disables crowbar protection calibration.
How does the crowbar protection function in the ADP3171JR-REEL7 operate during overvoltage events?
When FB exceeds 120% of nominal (1.44 V), the ADP3171JR-REEL7 forces DRVL high, turning on the low-side MOSFET to short the output. This pulls voltage down until it falls below ~50% (0.6 V), at which point crowbar releases and normal regulation resumes - provided the fault (e.g., failed feedback resistor) is removed. No external components are required; response time is 400 ns from overvoltage detection to DRVL activation.
Is the ADP3171JR-REEL7 compatible with lead-free reflow processes?
Yes, the ADP3171JR-REEL7 in its 14-lead narrow SOIC (R-14) package is rated for standard lead-free reflow profiles per JEDEC J-STD-020, with peak temperature up to 260°C for 10 seconds. The device's absolute maximum junction temperature is 125°C, and thermal resistance θJA is 105°C/W - sufficient for typical motherboard layouts with moderate copper pour under the package.
ADP3171JR-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- ADP3171
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Topology:
- Step-Down (Buck) Synchronous (1), Linear (LDO) (2)
- Number of Outputs:
- 3
- Frequency - Switching:
- -
- Voltage/Current - Output 1:
- Fixed, Controller, Controller, 1.2V, -
- Voltage/Current - Output 2:
- Fixed, Controller, Controller, -, -
- Voltage/Current - Output 3:
- Fixed, Controller, Controller, -, -
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- Yes
- Voltage - Supply:
- 12V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
ADP3171JR-REEL7 FAQ
1.How can I place an order for ADP3171JR-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP3171JR-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 ADP3171JR-REEL7 reliable?
The price and inventory of ADP3171JR-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP3171JR-REEL7 is usually 5 days.
3.What payment methods are accepted for ADP3171JR-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP3171JR-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP3171JR-REEL7?
ADP3171JR-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP3171JR-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 ADP3171JR-REEL7?
For technical support, including ADP3171JR-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP3171JR-REEL7 requirements.
6.How does Aetrix verify that ADP3171JR-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADP3171JR-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 ADP3171JR-REEL7 meets industry standards.
7.What is the process for return or replacement of ADP3171JR-REEL7?
All ADP3171JR-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADP3171JR-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 ADP3171JR-REEL7 part is unused and in its original packaging.
Return procedure for ADP3171JR-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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