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Analog Devices Inc. ADM1051AJR-REEL
- Part No.:
- ADM1051AJR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM1051AJR-REEL.pdf
- Description:
- IC REG BDGAP DUAL 1.5/1.8V 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:36,900
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Product details
Overview
ADM1051AJR-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 fixed 1.515 V (Channel 1) and 1.818 V (Channel 2) outputs with ±2.5% accuracy over line, load, and temperature, drives external N-channel MOSFETs in source-follower configuration, and features hiccup-mode fault protection and multilevel SHDN1 for TYPEDET-compatible 1.5 V/3.3 V selection.
For engineers reviewing the ADM1051AJR-REEL datasheet, ADM1051AJR-REEL pinout, ADM1051AJR-REEL application, or ADM1051AJR-REEL equivalent, key selection considerations include its 8-lead SOIC package, dual independent control amplifiers with 3 V/µs slew rate and 5 µs settling time, hiccup-mode hold-off timing, shutdown input logic thresholds, and ICH-compliant 1.8 V/3.3 V sequenced power-up behavior specific to the ADM1051A variant.
Technical Context
The ADM1051AJR-REEL integrates two independent control amplifier channels sharing a precision 1.2 V bandgap reference. Channel 1 supports four SHDN1 voltage-defined modes (shutdown, 1.5 V regulation, 3.3 V pass-through, and default 1.5 V), while Channel 2 provides fixed 1.818 V output with no hiccup-mode operation per ADM1051A specification. Both channels drive external N-channel MOSFET gates via FORCE outputs with 10 V high / 2 V low swing capability and 50 kΩ sense-input impedance.
It operates from a 12 V VCC supply with power-on reset threshold of 6–9 V, requires 3.3 V input to MOSFET drains, and implements hiccup-mode fault protection on Channel 1 only-holding off for ~60 ms post-POR or shutdown release, then pulsing at 1:40 duty cycle if output falls below 0.8 × VOUT. Channel 2 hiccup mode is disabled in ADM1051A to enforce ≤2 V differential between 1.818 V and 3.3 V rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltages | Channel 1: 1.515 V (default) or 3.3 V pass-through; Channel 2: fixed 1.818 V - enables AGP TYPEDET compatibility and ICH sequencing compliance. |
| Accuracy | ±2.5% over line (3.0–3.6 V), load (10 mA–1 A), and temperature (0°C–70°C) - ensures stable core/bus termination under real motherboard conditions. |
| Control Amplifier Slew Rate | 3 V/µs - supports fast transient response during load steps up to 2 A without oscillation. |
| Closed-Loop Settling Time | 5 µs (10 mA → 2 A) - guarantees rapid recovery from dynamic load changes typical in CPU/GPU power domains. |
| Hiccup Mode Hold-Off Time | 60 ms nominal - prevents false triggering during power-up or channel enable sequences. |
| Supply Current (Active) | 2.4–4.0 mA - minimizes auxiliary power draw from 12 V rail in always-on motherboard subsystems. |
| Shutdown Current | 600–1000 µA (both channels) - enables low-power standby states without disconnecting VCC. |
Pinout & Package
ADM1051AJR-REEL is housed in an 8-lead narrow-body SOIC (R-8) package with θJA = 150°C/W, rated for 0°C to 70°C operation and 650 mW max continuous power dissipation at TA = 70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FORCE 2 (Pin 1) | Channel 2 control amplifier output | Drives gate of external N-channel MOSFET; 10 V high / 2 V low swing ensures full enhancement across temperature. |
| SENSE 2 (Pin 2) | Inverting input for Channel 2 feedback | Monitors regulated output at load point via resistor divider; 50 kΩ input impedance minimizes loading error. |
| SHDN2 (Pin 3) | Active-low digital shutdown input | Internal 50 µA pull-up; <0.8 V forces output low - enables synchronous disable of 1.818 V rail with system control logic. |
| GND (Pin 4) | Analog and power ground reference | Must be connected to low-impedance PCB ground plane near load return paths to avoid regulation error from IR drop. |
| SHDN1 (Pin 5) | Multi-level voltage-selectable shutdown input | Supports four modes: <0.8 V (shutdown), 2–3.9 V (1.5 V), 4.3–5.3 V (3.3 V pass-through), >6.2 V/floating (1.5 V) - directly interfaces with PC motherboard TYPEDET signal. |
| SENSE 1 (Pin 6) | Inverting input for Channel 1 feedback | Same function as SENSE 2 but optimized for lower-RDS(on) MOSFETs like PHD55N03LT used in 3.3 V mode. |
| FORCE 1 (Pin 7) | Channel 1 control amplifier output | Higher gate-drive strength than FORCE 2 - tailored for MOSFETs with elevated gate capacitance in 3.3 V pass-through operation. |
| VCC (Pin 8) | Main 12 V supply input | Power-on reset activates above 6–9 V; supplies internal bandgap, comparators, and amplifier bias - must be decoupled with ≥1 µF ceramic close to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent regulator controllers | Enables simultaneous 1.515 V AGP and 1.818 V ICH rail generation on single die - reduces BOM count and layout area vs. discrete solutions. |
| TYPEDET-compatible SHDN1 interface | Four-voltage-mode logic eliminates need for external level shifters or GPIO expanders when interfacing with standard PC motherboard TYPEDET signaling. |
| ICH-sequenced power-up (ADM1051A only) | VCC powered from 5 VSB + 12 V diode-OR ensures Channel 2 rises with 3.3 V rail before Channel 1 POR delay - enforces ≤2 V differential required by Intel I/O hub chipsets. |
| Hiccup-mode fault protection (Channel 1 only) | Self-timed 1:40 duty-cycle pulsing limits MOSFET power dissipation during sustained short-circuit - avoids thermal runaway without current-sense resistors. |
| No external voltage-setting resistors | Fixed 1.515 V / 1.818 V outputs eliminate trimming components and associated placement/tolerance errors - improves production yield and long-term stability. |
Applications
| AGP Graphics Power Control | ICH Core Voltage Regulation |
|---|---|
Use Scenario: Regulating 1.5 V or 3.3 V supply for AGP 2×/4× graphics cards based on TYPEDET signal state on desktop/server motherboards. IC Role / Device Role / Timing Role: Dual-channel voltage controller providing precise, sequenced, and fault-protected output rails - Channel 1 dynamically switches between 1.5 V and 3.3 V; Channel 2 maintains stable 1.818 V. Use Value: Eliminates need for separate regulators or manual jumper configuration - enables automatic AGP mode detection and seamless graphics card compatibility. | Use Scenario: Generating 1.818 V core voltage for Intel I/O Control Hub (ICH) chipsets requiring strict sequencing relative to 3.3 V supply. IC Role / Device Role / Timing Role: Precision regulator controller enforcing ≤2 V differential between 1.818 V rail and 3.3 V rail via ADM1051A-specific power-up architecture. Use Value: Prevents ICH latch-up or initialization failure during power-up - satisfies Intel chipset specification without external sequencing ICs or complex timing circuits. |
| Active Bus Termination | Desktop Motherboard VRM Auxiliary Control |
Use Scenario: Providing low-noise, tightly regulated termination voltage for high-speed parallel buses (e.g., AGP, PCI-X) where dynamic load changes induce significant IR drop. IC Role / Device Role / Timing Role: High-bandwidth control amplifier driving low-RDS(on) N-MOSFETs as source followers - delivers fast transient response (<5 µs) and minimal output impedance. Use Value: Maintains signal integrity across bus segments under varying data traffic - reduces reflection-induced jitter and bit errors in high-throughput systems. | Use Scenario: Managing auxiliary power domains on ATX desktop motherboards where space-constrained layouts demand integrated dual-rail control. IC Role / Device Role / Timing Role: Compact 8-lead SOIC voltage controller replacing discrete op-amp + reference + comparator solutions - integrates bandgap, comparators, and dual amplifiers. Use Value: Reduces PCB real estate by >40% vs. discrete implementation - simplifies thermal management and improves EMI performance through monolithic design. |
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 |
|---|---|---|---|
| ADM1051JR-REEL | Non-A variant; Channel 2 hiccup mode enabled; no ICH sequencing support; SHDN1 lacks 3.3 V pass-through mode. | Suitable for legacy AGP-only designs without ICH chipset requirements or strict rail sequencing. | Select ADM1051JR-REEL only if TYPEDET compatibility is needed without ICH sequencing constraints and hiccup protection on both channels is desired. |
| TPS51100PWR | TI dual-channel sink/source controller; supports 0.9–5.5 V adjustable outputs; integrated MOSFET drivers; no built-in bandgap reference. | Targets DDR memory termination and point-of-load regulation with programmable voltage and current limits. | Choose TPS51100PWR for applications requiring adjustable output voltages, higher current capability (>3 A), or integrated gate drivers - not for fixed 1.515 V/1.818 V AGP/ICH use. |
Compared with ADM1051JR-REEL, the ADM1051AJR-REEL adds ICH-compliant sequencing and disables Channel 2 hiccup mode to prevent violation of 2 V rail differential limits, while TPS51100PWR offers programmability and higher drive strength at the cost of fixed-voltage precision and TYPEDET-native interface.
Availability
ADM1051AJR-REEL is available at Aetrix Electronics and suitable for desktop computers, servers, and workstations requiring stable component supply, precise dual-rail voltage control, and long-term obsolescence management in high-volume motherboard manufacturing.
Supply support for ADM1051AJR-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 industrial, automotive, communications, and computing markets with precision power, sensing, and interface solutions.
The ADM1051A product line was designed specifically for PC motherboard power management - delivering dual-channel, TYPEDET-aware, and ICH-sequenced voltage regulation to meet Intel's platform power architecture requirements for AGP and I/O hub applications.
FAQ
What is the key functional difference between ADM1051AJR-REEL and ADM1051JR-REEL?
The ADM1051AJR-REEL implements ICH-compliant power sequencing by powering VCC from 5 VSB + 12 V diode-OR, ensuring Channel 2 (1.818 V) rises with the 3.3 V rail before Channel 1's power-on reset delay. It also disables hiccup mode on Channel 2 and adds 3.3 V pass-through capability to SHDN1. The ADM1051JR-REEL lacks these features and enables hiccup mode on both channels.
How does ADM1051AJR-REEL achieve TYPEDET compatibility for AGP graphics voltage selection?
The ADM1051AJR-REEL uses multilevel SHDN1 voltage thresholds: 2–3.9 V selects 1.5 V output (TYPEDET = 0 V), while 4.3–5.3 V forces 3.3 V pass-through (TYPEDET = 1). A simple resistor divider from 5 V supply to SHDN1 enables direct interface with standard motherboard TYPEDET signals without additional logic.
What external components are required to operate ADM1051AJR-REEL in a typical motherboard application?
ADM1051AJR-REEL requires two external N-channel MOSFETs (e.g., PHD55N03LT for Channel 1, MTD3055VL for Channel 2), input/output bulk capacitors (≥100 µF each, low-ESR), a 1 µF ceramic capacitor on VCC, and optional pull-up/pull-down resistors for SHDN1/SHDN2. No external voltage-setting resistors are needed due to internal precision ratios.
Why is hiccup mode disabled on Channel 2 of ADM1051AJR-REEL?
Hiccup mode is disabled on Channel 2 of ADM1051AJR-REEL to prevent the 1.818 V rail from falling more than 2 V below the 3.3 V rail during fault conditions - a requirement specified by Intel I/O Control Hub chipsets. Enabling hiccup mode could cause uncontrolled voltage collapse violating this constraint, risking ICH initialization failure.
What is the maximum load current supported by ADM1051AJR-REEL in standard configurations?
ADM1051AJR-REEL supports up to 2 A load current per channel with recommended MOSFETs (PHD55N03LT, MTD3055VL) and proper decoupling (two 100 µF low-ESR capacitors per channel). Stability and thermal performance depend on PCB copper area, MOSFET RDS(on), and ambient temperature - derating is required above 70°C ambient.
ADM1051AJR-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 2
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 12V
- Frequency - Switching:
- -
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- No
- Clock Sync:
- -
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Power on Reset
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADM1051AJR-REEL FAQ
1.How can I place an order for ADM1051AJR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM1051AJR-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 ADM1051AJR-REEL reliable?
The price and inventory of ADM1051AJR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM1051AJR-REEL is usually 5 days.
3.What payment methods are accepted for ADM1051AJR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM1051AJR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM1051AJR-REEL?
ADM1051AJR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM1051AJR-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 ADM1051AJR-REEL?
For technical support, including ADM1051AJR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM1051AJR-REEL requirements.
6.How does Aetrix verify that ADM1051AJR-REEL is sourced from the original manufacturer or authorized distributors?
All ADM1051AJR-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 ADM1051AJR-REEL meets industry standards.
7.What is the process for return or replacement of ADM1051AJR-REEL?
All ADM1051AJR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM1051AJR-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 ADM1051AJR-REEL part is unused and in its original packaging.
Return procedure for ADM1051AJR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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