My Inquiry
My Account
Analog Devices Inc. ADP3179JRU-REEL7
- Part No.:
- ADP3179JRU-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADP3179JRU-REEL7.pdf
- Description:
- 4-BIT PROG BUCK CONTROLLER
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ADP3179JRU-REEL7 from Analog Devices is a 4-bit programmable synchronous buck controller for Intel Pentium III and Celeron core voltage regulation, featuring ADOPT™ active voltage positioning, ±0.8% total output accuracy over temperature, and dual adjustable linear regulator controllers. It drives external N-channel MOSFETs with constant off-time current-mode control and integrates overvoltage crowbar protection.
For engineers reviewing the ADP3179JRU-REEL7 datasheet, ADP3179JRU-REEL7 pinout, ADP3179JRU-REEL7 application, or ADP3179JRU-REEL7 equivalent, key selection considerations include VID-programmable 1.3 V–2.05 V output, adjustable linear regulator outputs (set via external resistor dividers), CT-timed switching frequency, and integrated PWRGD and crowbar functions for microprocessor protection.
Technical Context
The ADP3179JRU-REEL7 implements 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 capacitor on the CT pin and charged at 150 µA typical, enabling stable operation without slope compensation.
It features Analog Devices' ADOPT™ technology, which dynamically adjusts output voltage as a function of load current to optimize transient response-reducing required output capacitance while meeting VRM 8.4 specifications. Its two linear regulator controllers are externally adjustable (via LRFB1/LRFB2 feedback dividers), unlike the fixed 2.5 V/1.8 V outputs of the ADP3159.
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 from processor |
| Total Output Accuracy | ±0.8% over 0°C to 70°C, enabling tight compliance with VRM 8.4 core supply tolerances |
| Crowbar Trip Threshold | 115–125% of nominal DAC voltage, providing hardware-level overvoltage protection without external components |
| Linear Regulator Outputs | Adjustable via external resistor dividers on LRFB1/LRFB2 pins (not fixed) |
| Operating Temperature | 0°C to 70°C ambient, suitable for commercial motherboard applications |
| Package | 20-lead TSSOP (RU-20), RoHS-compliant, lead-free |
| UVLO Threshold | 7.0 V ±0.25 V, ensuring reliable startup from 12 V rail with hysteresis for noise immunity |
Pinout & Package
ADP3179JRU-REEL7 is housed in a 20-lead Thin Shrink Small Outline Package (TSSOP, RU-20) with exposed pad for thermal performance. Pin 1 is marked by a dot; pins 1 and 19 are no-connect.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VID0–VID3 | Voltage identification inputs | Read 4-bit code from CPU to set FB regulation voltage; internally pulled up to 5.4 V reference |
| FB | Feedback input | Remote-sense node for error amplifier; sets core output voltage via DAC reference |
| CS+, CS− | Current sense differential inputs | Monitor inductor current via external sense resistor; threshold = 69–87 mV for current limiting |
| DRVH, DRVL | High-side and low-side gate drivers | Drive external N-MOSFETs; rail-to-rail swing (GND to VCC), 6 Ω typical output impedance |
| LRFB1, LRFB2 | Linear regulator feedback inputs | High-impedance inputs (0.3–1 µA) for setting adjustable LDO outputs via external resistor dividers |
| LRDRV1, LRDRV2 | Linear regulator gate drivers | Drive external N-MOSFETs for auxiliary rails (e.g., AGP, GTL); output voltage follows VCC minus drop |
| PWRGD | Power good open-drain output | Asserts high after 500 ms when output is within ±20% of target; used for CPU reset sequencing |
| CT | Timing capacitor connection | Sets constant off-time (3.5–4.5 µs typ.); determines switching frequency in conjunction with VIN/VOUT ratio |
| GND, VCC | Ground and supply rails | VCC accepts 4.5 V–12.6 V; GND requires low-impedance path to synchronous MOSFET sources |
Key Features
| Feature | Design Value |
|---|---|
| ADOPT™ Active Voltage Positioning | Dynamic DC bias shift proportional to load current, minimizing output capacitor count while meeting Intel VRM 8.4 transient specs |
| Integrated Overvoltage Crowbar | Hardware-triggered low-side MOSFET activation at >120% nominal output, protecting CPU without external circuitry |
| Dual Adjustable Linear Regulators | Independent feedback (LRFB1/LRFB2) enables user-defined auxiliary voltages (e.g., 2.5 V, 1.8 V, or custom values) using resistor dividers |
| VID-Compatible Core Regulation | Direct interface to Intel Pentium III/Celeron VID bus; supports all 16 codes from 1.30 V to 2.05 V per Table I |
| Current-Mode Constant Off-Time Control | Eliminates need for slope compensation; provides inherent stability across wide VIN/VOUT ratios and load steps |
Applications
| Desktop CPU Core Supply | AGP/GTL Auxiliary Rail Generation |
|---|---|
Use Scenario: Regulating core voltage for Intel Pentium III processors in ATX desktop motherboards with 5 V input and 12 V bias rail. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing 15 A peak load, VID-programmed output, and ADOPT-based transient compensation. Use Value: Enables compliance with VRM 8.4 ±40 mV static and ±80 mV transient tolerance using only five Rubycon ZA-series output capacitors (ESR < 5 mΩ). | Use Scenario: Generating 2.5 V AGP or 1.8 V GTL+ supply from same 12 V rail used for main controller bias. IC Role / Device Role / Timing Role: Dual linear regulator controller driving external N-MOSFETs; operates independently of main buck loop during UVLO or standby. Use Value: Eliminates need for separate LDO ICs; maintains auxiliary rail regulation even when main 12 V supply is below UVLO threshold (e.g., 5 VSB mode). |
| VRM 8.4-Compliant Motherboard Design | Low-Cost Pentium-Class Reference Platform |
Use Scenario: Implementing full Intel VRM 8.4 power delivery including core, AGP, and GTL rails on cost-sensitive consumer boards. IC Role / Device Role / Timing Role: Single-chip solution integrating buck control, crowbar protection, PWRGD signaling, and two auxiliary LDO controllers. Use Value: Reduces BOM count by replacing discrete op-amps, comparators, and dedicated LDOs-verified in Figure 3 reference design (15 A Pentium III). | Use Scenario: Rapid prototyping of Celeron-based embedded systems requiring stable core and I/O supplies with minimal external components. IC Role / Device Role / Timing Role: Central power management IC supporting both high-efficiency switching and precision linear regulation from shared VCC. Use Value: Allows use of standard 0805/1206 resistors and ceramic caps for linear regulator feedback, avoiding custom trim or trimming steps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADP3159JRU-REEL7 | Fixed 2.5 V / 1.8 V linear regulator outputs; identical buck control, VID range, and ADOPT functionality | Not suitable where adjustable auxiliary rails are required (e.g., non-standard AGP voltages) | Select ADP3159JRU-REEL7 only when fixed LDO outputs match system requirements and board layout rework is undesirable |
| ISL6522CBZ-T | 6-bit VID (1.1–2.05 V), integrated MOSFET drivers, no linear regulator controllers, different pinout and CT programming | Lacks auxiliary rail generation capability; requires external LDOs or separate controllers for AGP/GTL | Choose ISL6522CBZ-T when higher VID resolution is needed and auxiliary rail complexity is handled elsewhere in the design |
Compared with ADP3159JRU-REEL7, the ADP3179JRU-REEL7 provides design flexibility for non-standard auxiliary voltages via external feedback dividers, while ISL6522CBZ-T trades integrated LDO control for finer core voltage granularity and driver integration-but increases component count for multi-rail systems.
Availability
ADP3179JRU-REEL7 is available at Aetrix Electronics and suitable for desktop motherboard designs, VRM 8.4-compliant power supplies, and Pentium-class embedded computing platforms requiring stable component supply and long-term industrial availability.
Supply support for ADP3179JRU-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 ADP3179JRU-REEL7 belongs to Analog Devices' VRM-compliant power controller product line, designed specifically for Intel-compatible microprocessor core and auxiliary voltage regulation in cost-sensitive, high-volume motherboard applications.
FAQ
What is the primary function of the ADP3179JRU-REEL7 in a motherboard power system?
The ADP3179JRU-REEL7 serves as the main synchronous buck controller for Intel Pentium III and Celeron processor core voltage regulation. It reads the CPU's 4-bit VID code to set output between 1.3 V and 2.05 V, implements ADOPT™ active voltage positioning for optimal transient response, and integrates dual adjustable linear regulator controllers for auxiliary rails like AGP and GTL. ADP3179JRU-REEL7 replaces multiple discrete regulators with a single IC while meeting VRM 8.4 specifications.
How does the ADP3179JRU-REEL7 differ from the ADP3159JRU-REEL7?
The ADP3179JRU-REEL7 differs from the ADP3159JRU-REEL7 solely in its linear regulator configuration: ADP3179JRU-REEL7 supports externally adjustable outputs via resistor dividers on LRFB1 and LRFB2, whereas ADP3159JRU-REEL7 has fixed 2.5 V and 1.8 V LDO outputs. All buck control functions-including VID decoding, ADOPT™, crowbar, PWRGD, and CT-based timing-are identical between the two parts. ADP3179JRU-REEL7 is selected when system requirements demand non-standard auxiliary voltages.
What is the purpose of the CT pin on the ADP3179JRU-REEL7?
The CT pin on the ADP3179JRU-REEL7 connects to an external capacitor that sets the constant off-time of the current-mode buck controller. A 150 µA (typ.) charging current ramps the CT voltage; when it reaches ~3.0 V, the next on-cycle begins. This determines switching frequency in conjunction with input/output voltage ratio-e.g., ~200 kHz at 1.7 V out from 5 V in. ADP3179JRU-REEL7 requires no slope compensation due to this architecture, simplifying loop stability design.
Does the ADP3179JRU-REEL7 provide overvoltage protection for the microprocessor?
Yes, the ADP3179JRU-REEL7 includes an integrated overvoltage crowbar function that activates when output exceeds 115–125% of the nominal DAC-set voltage. Upon detection, it forces the DRVL (low-side) driver high, shorting the output through the synchronous rectifier MOSFET to collapse voltage and protect the CPU. The crowbar releases when output falls below ~50% of nominal-e.g., from 1.85 V down to <0.75 V for a 1.5 V target. ADP3179JRU-REEL7 implements this without external components.
Can the ADP3179JRU-REEL7 operate with only a 5 V input supply?
No-the ADP3179JRU-REEL7 requires a minimum VCC of 4.5 V but is specified for operation with 12 V bias (as shown in Figure 3). Its internal circuits-including DRVH/DRVL drivers, linear regulator controllers, and crowbar logic-depend on sufficient VCC headroom above the highest regulated output (2.05 V). While VCC may be derived from 5 VSB in standby, full regulation and crowbar functionality require ≥7.0 V (UVLO threshold); thus, a 12 V rail or boosted 5 V source is necessary for normal operation. ADP3179JRU-REEL7 is not rated for direct 5 V-only operation.
ADP3179JRU-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- ADP3179
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- -
- Frequency - Switching:
- -
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Frequency Control, Power Good, Reset
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
ADP3179JRU-REEL7 FAQ
1.How can I place an order for ADP3179JRU-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP3179JRU-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 ADP3179JRU-REEL7 reliable?
The price and inventory of ADP3179JRU-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP3179JRU-REEL7 is usually 5 days.
3.What payment methods are accepted for ADP3179JRU-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP3179JRU-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP3179JRU-REEL7?
ADP3179JRU-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP3179JRU-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 ADP3179JRU-REEL7?
For technical support, including ADP3179JRU-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP3179JRU-REEL7 requirements.
6.How does Aetrix verify that ADP3179JRU-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADP3179JRU-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 ADP3179JRU-REEL7 meets industry standards.
7.What is the process for return or replacement of ADP3179JRU-REEL7?
All ADP3179JRU-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADP3179JRU-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 ADP3179JRU-REEL7 part is unused and in its original packaging.
Return procedure for ADP3179JRU-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADP3179JRU-REEL7 Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
