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Analog Devices Inc. ADM1051JR-REEL
- Part No.:
- ADM1051JR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- -
- Datasheet:
-
ADM1051JR-REEL.pdf
- Description:
- IC REG CTRLR BUCK 8SOIC
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Inventory:155,000
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Product details
Overview
ADM1051JR-REEL from Analog Devices is a dual-channel precision voltage regulator controller for PC motherboard power rail generation and AGP/ICH active bus termination. It delivers 1.515 V (Channel 1) and 1.818 V (Channel 2) outputs with ±2.5% accuracy over line, load, and temperature, supports external N-channel MOSFETs, and features hiccup-mode fault protection. Used in desktop computers and servers to regulate critical low-voltage rails.
For engineers reviewing the ADM1051JR-REEL datasheet, ADM1051JR-REEL pinout, ADM1051JR-REEL application, or ADM1051JR-REEL equivalent, key selection criteria include dual independent control amplifier performance, TYPEDET-compatible multilevel SHDN1 voltage selection, hiccup-mode timing parameters, SOIC-8 thermal characteristics (θJA = 150°C/W), and compatibility with PHD55N03LT/MTD3055VL external MOSFETs.
Technical Context
The ADM1051JR-REEL integrates two independent control amplifiers driven by a precision 1.2 V bandgap reference, each configured as a high-current gate driver for external N-channel MOSFETs operating in source-follower topology. Channel 1 supports four SHDN1 voltage-defined modes (shutdown, 1.5 V, 3.3 V pass-through, and default 1.5 V), while Channel 2 provides fixed 1.818 V regulation.
Hiccup-mode protection activates when output falls below 0.8 × VOUT, enforcing a 1:40 duty cycle with 30–90 ms hold-off time and 0.5–1.5 ms on-time. Power-on reset triggers at 6–9 V on VCC, disabling outputs until threshold is exceeded - except Channel 2 of ADM1051A variants, which is not applicable to ADM1051JR-REEL per ordering guide and functional description.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage (Ch1) | 1.515 V nominal; selectable to 3.3 V via SHDN1 voltage level (4.3–5.3 V) |
| Output Voltage (Ch2) | 1.818 V fixed; no voltage selection or hiccup mode on ADM1051JR |
| Accuracy | ±2.5% over line (3.0–3.6 V), load (10 mA–1 A), and temperature (0°C–70°C) |
| Control Amplifier Slew Rate | 3 V/µs; enables fast transient response for load steps up to 2 A |
| Hiccup Mode Threshold | 0.8 × VOUT; detects 20% output collapse to initiate fault limiting |
| Supply Current (Active) | 2.4–4.0 mA; low quiescent draw supports efficient standby operation |
| Package | 8-Lead SOIC (R-8); θJA = 150°C/W; compatible with standard PCB reflow |
Pinout & Package
ADM1051JR-REEL is housed in an 8-lead narrow-body SOIC package (R-8), with exposed pad omitted and JEDEC MS-012AC compliant dimensions. Thermal resistance θJA = 150°C/W enables operation up to 70°C ambient without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FORCE 2 (Pin 1) | Channel 2 control amplifier output | Drives gate of external N-MOSFET; 10 V high / 2 V low swing into 10 kΩ |
| SENSE 2 (Pin 2) | Channel 2 feedback input | Connects to MOSFET source; 50 kΩ input impedance minimizes loading error |
| SHDN2 (Pin 3) | Channel 2 shutdown enable | Active-low digital input; internal 50 µA pull-up; <0.8 V disables output |
| GND (Pin 4) | Analog and power ground reference | Single-point return path; must be routed separately from load current paths |
| SHDN1 (Pin 5) | Channel 1 multilevel control input | Four-mode interface: <0.8 V (shutdown), 2–3.9 V (1.5 V), 4.3–5.3 V (3.3 V), >6.2 V/floating (1.5 V) |
| SENSE 1 (Pin 6) | Channel 1 feedback input | Connects to MOSFET source; same 50 kΩ impedance as SENSE 2 |
| FORCE 1 (Pin 7) | Channel 1 control amplifier output | Optimized for high-Ciss MOSFETs (e.g., PHD55N03LT); 3 V/µs slew rate |
| VCC (Pin 8) | Main supply input | 12 V ±6% input; powers all circuitry; POR activates above 6–9 V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent control channels | Enables simultaneous regulation of 1.515 V and 1.818 V rails without shared components or cross-talk |
| TYPEDET-compatible SHDN1 | Eliminates need for external logic or voltage translators when interfacing with AGP motherboard TYPEDET signal |
| No external setting resistors | Fixed output voltages set internally; reduces BOM count and layout sensitivity versus resistor-based regulators |
| Hiccup-mode fault protection | Self-resetting 1:40 duty-cycle pulsing limits MOSFET power dissipation during sustained short-circuit conditions |
| N-channel MOSFET optimization | High gate-drive strength and slew rate support low-RDS(on) devices like PHD55N03LT, minimizing conduction loss |
Applications
| AGP Graphics Power Supply | ICH Bus Termination |
|---|---|
Use Scenario: Regulating 1.5 V or 3.3 V AGP slot power based on TYPEDET signal state in desktop motherboards. IC Role / Device Role / Timing Role: Dual-channel voltage controller providing precise, sequenced rail generation with automatic mode switching. Use Value: Enables single-component support for both 2× and 4× AGP graphics modes without manual configuration or firmware intervention. | Use Scenario: Generating stable 1.818 V termination voltage for I/O Control Hub (ICH) interfaces on server-class motherboards. IC Role / Device Role / Timing Role: Precision regulator channel delivering fixed 1.818 V with ±2.5% accuracy across temperature and load variation. Use Value: Ensures signal integrity on high-speed ICH buses by maintaining tight voltage tolerance required for proper logic-level referencing. |
| Desktop CPU Core Auxiliary Rail | Workstation Memory Termination |
Use Scenario: Providing auxiliary 1.515 V bias for CPU core support circuitry where primary VRM cannot supply dedicated low-noise rail. IC Role / Device Role / Timing Role: Secondary regulator channel with hiccup-mode protection isolating faults from main power system. Use Value: Adds robustness against localized shorts without requiring full-system shutdown or complex current-sense circuitry. | Use Scenario: Supplying 1.818 V termination for DDR memory subsystems in multi-processor workstations. IC Role / Device Role / Timing Role: Low-drift voltage controller maintaining rail stability during rapid memory access bursts. Use Value: Reduces bit-error rates by holding termination voltage within 2.5% window despite 10 mA–1 A dynamic load swings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel voltage regulator controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM1051AJR-REEL | Includes ICH sequencing logic: Channel 2 rises with 5 VSB before VCC POR, preventing >2 V rail skew vs. 3.3 V supply | Required for newer ICH chipsets mandating strict 3.3 V / 1.818 V sequencing; ADM1051JR lacks this feature | Select ADM1051AJR-REEL only if motherboard design uses ICH-5 or later with sequencing compliance requirements |
| TPS51100PWR | Single-channel 1.5 V controller with integrated MOSFET driver; no second channel or SHDN1 voltage selection | Used for simpler point-of-load regulation where dual-rail coordination or AGP TYPEDET is unnecessary | Choose TPS51100PWR for cost-sensitive designs needing only one regulated rail and no multimode control |
Compared with ADM1051AJR-REEL, ADM1051JR-REEL omits ICH-specific sequencing but retains full TYPEDET compatibility and hiccup-mode protection on both channels; versus TPS51100PWR, ADM1051JR-REEL provides true dual-rail independence and multilevel SHDN1 control at higher component count.
Availability
ADM1051JR-REEL is available at Aetrix Electronics and suitable for desktop computers, servers, and workstations requiring stable component supply, precise dual-rail voltage control, and AGP/ICH bus termination capability.
Supply support for ADM1051JR-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, headquartered in Norwood, MA.
The ADM1051 product line was designed specifically for precision dual-rail power management on PC motherboards, targeting AGP graphics and I/O Control Hub (ICH) applications with minimal external components.
FAQ
What is the function of the SHDN1 pin on the ADM1051JR-REEL?
The SHDN1 pin on the ADM1051JR-REEL is a multilevel control input enabling four distinct operating modes: shutdown (<0.8 V), 1.5 V regulation (2–3.9 V or >6.2 V/floating), and 3.3 V pass-through (4.3–5.3 V). This functionality allows direct interfacing with PC motherboard TYPEDET signals without external logic, making ADM1051JR-REEL ideal for AGP graphics power management where mode selection depends on hardware signaling rather than software control.
Does the ADM1051JR-REEL support hiccup-mode protection on both channels?
Yes, the ADM1051JR-REEL implements hiccup-mode protection on both Channel 1 and Channel 2. When either output falls below 0.8 × its nominal voltage (1.212 V for Ch1, 1.454 V for Ch2), the corresponding control amplifier enters pulsed operation with 30–90 ms hold-off time and 0.5–1.5 ms on-time. This differs from the ADM1051A variant, where hiccup mode is disabled on Channel 2 - a distinction confirmed in the ADM1051/ADM1051A datasheet revision 0 specifications and functional descriptions.
What external MOSFETs are recommended for use with the ADM1051JR-REEL?
Analog Devices specifies PHD55N03LT for Channel 1 and MTD3055VL for Channel 2 in the ADM1051JR-REEL datasheet. PHD55N03LT is selected for its low RDS(on) and high gate capacitance compatibility with Channel 1's optimized drive strength, while MTD3055VL meets Channel 2's 1.818 V regulation requirements. Both devices are N-channel MOSFETs operating as source-followers, leveraging ADM1051JR-REEL's architecture to minimize conduction loss and simplify loop compensation.
How does the ADM1051JR-REEL achieve ±2.5% output voltage accuracy?
The ADM1051JR-REEL achieves ±2.5% output voltage accuracy through a precision 1.2 V bandgap reference, laser-trimmed internal resistor networks defining the 1.515 V and 1.818 V setpoints, and high-gain (100 dB) control amplifiers with low input offset. This accuracy is guaranteed over full operating conditions: input voltage range 3.0–3.6 V, load current 10 mA–1 A, and temperature 0°C–70°C - as verified in the ADM1051/ADM1051A datasheet revision 0 test conditions table.
Is the ADM1051JR-REEL pin-compatible with the ADM1051AJR-REEL?
Yes, the ADM1051JR-REEL is pin-compatible with the ADM1051AJR-REEL: both use identical 8-lead SOIC (R-8) packages with matching pin functions, electrical ratings, and thermal characteristics. However, functional differences exist - notably, ADM1051AJR-REEL adds ICH sequencing logic that modifies Channel 2 power-up behavior, while ADM1051JR-REEL implements full hiccup-mode protection on both channels. Board-level replacement requires verification of sequencing and protection requirements in the target application.
ADM1051JR-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Type:
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- Function:
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- Output Configuration:
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- Topology:
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- Number of Outputs:
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- Output Phases:
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- Voltage - Supply (Vcc/Vdd):
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- Frequency - Switching:
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- Duty Cycle (Max):
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- Synchronous Rectifier:
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- Clock Sync:
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- Serial Interfaces:
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- Control Features:
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- Operating Temperature:
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- Qualification:
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- Mounting Type:
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- Supplier Device Package:
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ADM1051JR-REEL FAQ
1.How can I place an order for ADM1051JR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM1051JR-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 ADM1051JR-REEL reliable?
The price and inventory of ADM1051JR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM1051JR-REEL is usually 5 days.
3.What payment methods are accepted for ADM1051JR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM1051JR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM1051JR-REEL?
ADM1051JR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM1051JR-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 ADM1051JR-REEL?
For technical support, including ADM1051JR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM1051JR-REEL requirements.
6.How does Aetrix verify that ADM1051JR-REEL is sourced from the original manufacturer or authorized distributors?
All ADM1051JR-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 ADM1051JR-REEL meets industry standards.
7.What is the process for return or replacement of ADM1051JR-REEL?
All ADM1051JR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM1051JR-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 ADM1051JR-REEL part is unused and in its original packaging.
Return procedure for ADM1051JR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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