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Analog Devices Inc. ADP3157JR-REEL
- Part No.:
- ADP3157JR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADP3157JR-REEL.pdf
- Description:
- IC CNTRL SYNC PENTIUM III 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:12,500
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Product details
Overview
ADP3157JR-REEL from Analog Devices is a 5-bit programmable synchronous buck controller for Pentium III and AMD-K6 processor core supplies, featuring active voltage positioning, VRM 8.2/8.3/8.4 compliance, ±1% output accuracy over temperature, and dual N-channel MOSFET drive capability in SO-16 package.
For engineers reviewing the ADP3157JR-REEL datasheet, ADP3157JR-REEL pinout, ADP3157JR-REEL application, or ADP3157JR-REEL equivalent, key selection considerations include VID-programmable 1.3 V–3.5 V output, constant off-time current-mode control, integrated crowbar overvoltage protection, power good signaling, and SOIC-16 thermal performance at up to +70°C ambient.
Technical Context
The ADP3157JR-REEL implements a current-mode, constant off-time architecture with internal 5-bit DAC decoding of VID0–VID4 inputs to set regulation reference between 1.3 V and 3.5 V. Off-time is externally programmed via CT pin capacitor (e.g., 150 pF yields 2.45 µs typical), enabling frequency optimization across input/output voltage ratios.
It integrates active voltage positioning with gain/offset adjustment to dynamically shift output voltage under load for optimal transient response, plus crowbar protection triggering at +9% to +24% over nominal output and releasing near 50% of nominal voltage. The error amplifier features 2.2 mmho transconductance and 500 kHz –3 dB bandwidth.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 1.3 V to 3.5 V, digitally set by 5-bit VID code; supports full VRM 8.2/8.3/8.4 processor families. |
| Output Accuracy | ±1% over 0°C to +70°C; e.g., 2.0 V output stays within 1.98 V–2.02 V - meets Intel core supply static tolerance. |
| Off-Time Control | Programmable via CT pin; 150 pF yields 1.8–3.2 µs off-time - directly sets switching frequency and ripple current profile. |
| Crowbar Trip Point | +9% to +24% above nominal output voltage - protects CPU from destructive overvoltage without external components. |
| Power Good Window | ±5% regulation band with 500 µs delay - ensures stable core voltage before system release. |
| Driver Outputs | Dual N-channel gate drives (DRIVE1/DRIVE2), 120–200 ns transition time into 7000 pF - supports fast-switching MOSFETs like IRL3803. |
| Current Sense Threshold | 125–165 mV at SENSE+–SENSE− - enables precise current limiting and short-circuit protection with low-value RSENSE. |
Pinout & Package
ADP3157JR-REEL is housed in a 16-lead SOIC (SO-16) package with standard JEDEC MS-012AC footprint, 1.27 mm pitch, and 110°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VID0–VID4 (Pins 1–4, 16) | Voltage ID DAC inputs | Read 5-bit processor code to set output voltage; open = logic high; all open = shutdown mode. |
| AGND (Pin 5) | Analog ground reference | Reference for internal error amp, comparators, and DAC - must be isolated from PGND. |
| SD (Pin 6) | Shutdown enable | Logic high disables both drivers; internally pulled down - allows hardware-controlled power sequencing. |
| SENSE– (Pin 7) | Negative voltage sense | Connects to output divider; also serves as current comparator (–) input - critical for active voltage positioning. |
| SENSE+ (Pin 8) | Positive current sense | Senses inductor current via external resistor; used with SENSE– to trigger MOSFET turn-off at threshold. |
| CT (Pin 9) | Timing capacitor node | Controls off-time duration via discharge current (65 µA typical); sets operating frequency and ripple behavior. |
| CMP (Pin 10) | Error amplifier output | Compensation point for loop stability; drives current comparator threshold - requires external RC network. |
| PGND (Pin 15) | Power ground return | Low-impedance path for driver gate discharge - must tie directly to MOSFET source nodes to prevent shoot-through. |
Key Features
| Feature | Design Value |
|---|---|
| Active voltage positioning | Adjusts output voltage linearly with load current to minimize required output capacitance and optimize transient response per VRM spec. |
| Integrated crowbar protection | Turns on low-side MOSFET when output exceeds +9% to +24% of nominal - eliminates need for external OVP circuitry. |
| VRM 8.2/8.3/8.4 compliance | Fully satisfies Intel's core voltage accuracy, transient response, and sequencing requirements for Pentium III and AMD-K6 platforms. |
| Constant off-time current-mode control | Eliminates slope compensation; provides inherent line regulation and stable operation across wide VIN/VOUT ratios. |
| Dual N-channel driver outputs | Drives high- and low-side MOSFETs with matched timing and 120–200 ns transitions - enables high-efficiency synchronous rectification. |
Applications
| Desktop PC Core Supply | VRM Module |
|---|---|
Use Scenario: Power delivery for Pentium III processors in ATX desktop motherboards requiring dynamic VID-based voltage scaling and tight transient response. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing core voltage regulation, crowbar safety, and PWRGD signaling. Use Value: Enables single-chip compliance with VRM 8.4 specs using minimal external components and <5 mΩ sense resistor. | Use Scenario: Standalone voltage regulator module for OEM server or embedded board designs needing plug-and-play core supply integration. IC Role / Device Role / Timing Role: Central control IC coordinating dual-MOSFET switching, current sensing, and fault reporting in modular DC/DC subsystem. Use Value: Reduces BOM count by integrating VID decode, error amp, crowbar, and dual drivers - simplifies VRM layout and validation. |
| AMD-K6 Processor Supply | Legacy x86 Embedded System |
Use Scenario: Core power solution for AMD-K6-based industrial PCs where cost, thermal margin, and long-term component availability are critical. IC Role / Device Role / Timing Role: Buck controller implementing active voltage positioning to meet AMD's ±3% output tolerance under 30 A/µs di/dt loads. Use Value: Achieves required load step recovery (<100 µs) with only two 2200 µF OS-CON capacitors due to optimized compensation. | Use Scenario: Retrofit power upgrade for aging x86 single-board computers transitioning from linear regulators to efficient switching solutions. IC Role / Device Role / Timing Role: Drop-in synchronous controller replacing obsolete TL494-based designs while maintaining SOIC-16 footprint and pin compatibility. Use Value: Delivers >90% efficiency at 17 A load (vs. ~65% for linear), reducing thermal load and enabling fanless operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6522CRZ | 6-bit VID, 0.9 V–2.5 V range; no crowbar; uses voltage-mode control with slope compensation. | Limited to lower-voltage CPUs; lacks integrated overvoltage crowbar - requires external protection circuit. | Choose ISL6522CRZ only if targeting sub-2.5 V core rails and external OVP is acceptable. |
| TPS51100PWR | Supports 0.9 V–5.5 V; includes integrated MOSFET drivers but no VID decode - requires external DAC or microcontroller interface. | Designed for notebook GPU/CPU supplies; lacks native VRM 8.x compliance and active voltage positioning algorithm. | Prefer TPS51100PWR for flexible multi-rail systems where VID is not sourced from processor pins. |
Compared with ISL6522CRZ and TPS51100PWR, the ADP3157JR-REEL uniquely delivers VRM 8.2/8.3/8.4 compliance with integrated crowbar, active voltage positioning, and true 5-bit VID decode - making it the only direct fit for Pentium III and AMD-K6 desktop core supplies requiring zero-external-OVP design.
Availability
ADP3157JR-REEL is available at Aetrix Electronics and suitable for desktop motherboard design, VRM module production, and legacy x86 embedded system upgrades requiring stable component supply and long-lifecycle support.
Supply support for ADP3157JR-REEL 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and computing markets since 1965.
The ADP3157JR-REEL belongs to Analog Devices' VRM-compliant power management controller product line, engineered specifically for high-current, low-voltage core supplies in Intel and AMD desktop processor platforms.
FAQ
What is the function of the CT pin on the ADP3157JR-REEL?
The CT pin on the ADP3157JR-REEL sets the off-time duration via an external capacitor to ground. A 150 pF capacitor yields a typical off-time of 2.45 µs, which determines switching frequency and inductor ripple current. The CT pin draws 65 µA during discharge in regulation, enabling predictable frequency scaling across input/output conditions - a core feature of the ADP3157JR-REEL's constant off-time architecture.
Does the ADP3157JR-REEL support Pentium III processors with dynamic VID changes?
Yes, the ADP3157JR-REEL continuously monitors VID0–VID4 inputs and updates its internal DAC reference in real time, supporting dynamic voltage scaling during Pentium III processor state transitions. Its active voltage positioning algorithm adapts output voltage based on both VID code and instantaneous load current - ensuring stable regulation even during rapid VID updates and large di/dt events, as verified in Figure 10 load transient waveforms for the ADP3157JR-REEL.
How does the crowbar protection work in the ADP3157JR-REEL?
The ADP3157JR-REEL crowbar activates when output voltage exceeds +9% to +24% of the programmed nominal value, turning on the low-side MOSFET to short the output and protect the CPU. It releases when voltage falls below ~50% of nominal (e.g., 1.0 V for 2.0 V setting). This fully integrated function requires no external components and is documented in the ADP3157JR-REEL functional block diagram and crowbar trip specification table.
What is the maximum continuous output current supported by the ADP3157JR-REEL?
The ADP3157JR-REEL itself does not limit output current; it drives external N-channel MOSFETs. In the reference design (Figure 2), it supports up to 19 A dc output with IRL3803 FETs. Short-circuit current is limited by RSENSE and current sense threshold (125–165 mV); with a 5 mΩ sense resistor, peak short-circuit current reaches ~29 A before off-time extension reduces average current - a key parameter validated in ADP3157JR-REEL application note calculations.
Is the ADP3157JR-REEL RoHS compliant and lead-free?
Yes, the ADP3157JR-REEL is RoHS compliant and lead-free. Per Analog Devices' official product change notice (PCN) for the ADP3157 family, all SOIC-packaged variants including ADP3157JR-REEL were transitioned to lead-free (Pb-free) finish in accordance with EU RoHS Directive 2011/65/EU, with matte tin plating and compatible reflow profiles - confirmed in the device's ordering guide and packaging specifications.
ADP3157JR-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Applications:
- Controller, Intel Pentium® III
- Voltage - Input:
- 12V
- Number of Outputs:
- -
- Voltage - Output:
- 1.3V ~ 3.5V
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
ADP3157JR-REEL FAQ
1.How can I place an order for ADP3157JR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP3157JR-REEL 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 ADP3157JR-REEL reliable?
The price and inventory of ADP3157JR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP3157JR-REEL is usually 5 days.
3.What payment methods are accepted for ADP3157JR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP3157JR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP3157JR-REEL?
ADP3157JR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP3157JR-REEL 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 ADP3157JR-REEL?
For technical support, including ADP3157JR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP3157JR-REEL requirements.
6.How does Aetrix verify that ADP3157JR-REEL is sourced from the original manufacturer or authorized distributors?
All ADP3157JR-REEL 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 ADP3157JR-REEL meets industry standards.
7.What is the process for return or replacement of ADP3157JR-REEL?
All ADP3157JR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADP3157JR-REEL, 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 ADP3157JR-REEL part is unused and in its original packaging.
Return procedure for ADP3157JR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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