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Analog Devices Inc. ADM1051JR
- Part No.:
- ADM1051JR
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM1051JR.pdf
- Description:
- IC REG CTRLR BUCK 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:58,117
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Product details
Overview
ADM1051JR 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. Used in desktop computers and servers for stable low-voltage rail control.
For engineers reviewing the ADM1051JR datasheet, ADM1051JR pinout, ADM1051JR application, or ADM1051JR equivalent, key selection considerations include dual independent shutdown inputs (SHDN1 supports TYPEDET-compatible multilevel voltage selection), 8-lead SOIC package compatibility, hiccup-mode timing parameters (30–90 ms hold-off, 0.5–1.5 ms on-time), and channel-specific control amplifier specs (100 dB open-loop gain, 3 V/µs slew rate).
Technical Context
The ADM1051JR integrates two nearly identical control amplifier channels sharing a precision 1.2 V bandgap reference, each driving external N-channel MOSFETs as source-followers. 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 regulation with no hiccup-mode protection in the ADM1051A variant-though ADM1051JR (non-A) retains hiccup on both channels per datasheet Rev. 0 specifications.
It operates from a 12 V VCC supply with power-on reset activation above 6–9 V, requires no external resistors for voltage setting, and uses sense-input feedback networks to define output voltages. The control amplifiers deliver 10 V high / 2 V low force output swing into 10 kΩ loads, 5 µs turn-on time, and 5 µs closed-loop settling time under 10 mA–2 A load steps.
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 hiccup-mode protection in ADM1051A, but ADM1051JR supports hiccup on both channels |
| Accuracy | ±2.5% over line (3.0–3.6 V VIN), load (10 mA–1 A), and temperature (0°C–70°C) |
| Hiccup Mode Hold-Off Time | 30–90 ms; prevents false triggering during power-up or enable transitions |
| Control Amplifier Slew Rate | 3 V/µs; enables fast transient response to 10 mA ↔ 2 A load steps |
| Supply Current (Active) | 2.4–4.0 mA; low quiescent draw suitable for always-on motherboard rails |
| Shutdown Current | 600–1000 µA; both channels disabled with SHDN1 & SHDN2 low |
Pinout & Package
ADM1051JR is housed in an 8-lead narrow-body SOIC package (R-8), with θJA = 150°C/W and operating temperature range of 0°C to 70°C. Pin functions are validated per Analog Devices datasheet Rev. 0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - FORCE 2 | Channel 2 control amplifier output | Drives gate of external N-MOSFET; 10 V high / 2 V low swing into 10 kΩ |
| 2 - SENSE 2 | Inverting input for Channel 2 feedback | Connects to MOSFET source via resistor network to set 1.818 V output |
| 3 - SHDN2 | Active-low digital shutdown input | Internal 50 µA pull-up; forces FORCE 2 low when ≤0.8 V |
| 4 - GND | Analog ground reference | Must be connected to low-impedance PCB ground plane near load return paths |
| 5 - SHDN1 | Multi-level digital input for Channel 1 | Supports four modes: shutdown (<0.8 V), 1.5 V (2–3.9 V), 3.3 V pass-through (4.3–5.3 V), or default 1.5 V (>6.2 V/floating) |
| 6 - SENSE 1 | Inverting input for Channel 1 feedback | Connects to MOSFET source to set 1.515 V output; optimized for low-RDS(on) MOSFETs like PHD55N03LT |
| 7 - FORCE 1 | Channel 1 control amplifier output | Drives gate of external N-MOSFET; same drive capability as FORCE 2 |
| 8 - VCC | Main 12 V supply input | Power-on reset activates at 6–9 V; powers internal bandgap, amplifiers, and comparators |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent regulator controllers | Enables simultaneous 1.515 V and 1.818 V rail generation without external resistors or trimming |
| TYPEDET-compatible SHDN1 interface | Eliminates need for external logic or voltage translators when interfacing with AGP motherboard TYPEDET signals |
| Hiccup-mode fault protection | Self-resetting 1:40 duty-cycle pulsing (0.5–1.5 ms on, 20–60 ms off) limits MOSFET power dissipation during short-circuit faults |
| N-channel MOSFET optimization | High-current-force outputs and gate-drive tuning support low-RDS(on), high-Ciss devices (e.g., PHD55N03LT) for minimal conduction loss |
| Low-quiescent-power operation | 2.4–4.0 mA active current and sub-1 mA shutdown current reduce standby power in always-on systems |
Applications
| AGP Graphics Power Control | ICH Core Rail Generation |
|---|---|
Use Scenario: Regulating 1.5 V or 3.3 V AGP graphics slot power based on TYPEDET signal state on desktop motherboard. IC Role / Device Role / Timing Role: Dual-channel voltage controller providing dynamic rail selection and hiccup-mode fault containment for GPU interface power. Use Value: Eliminates discrete logic and voltage translators; supports both 2× and 4× AGP modes with single IC and shared 3.3 V input. |
Use Scenario: Generating stable 1.818 V I/O hub core supply synchronized with 3.3 V rail in server motherboards. IC Role / Device Role / Timing Role: Precision regulator controller ensuring <2 V differential between 3.3 V and 1.818 V rails per chipset sequencing requirements. Use Value: Prevents ICH latch-up or initialization failure by enforcing safe voltage ramp alignment without external sequencing ICs. |
| Active Bus Termination | Desktop CPU VRM Auxiliary Control |
Use Scenario: Providing low-noise, tightly regulated termination voltage for high-speed parallel buses (e.g., PCI-X, legacy AGP). IC Role / Device Role / Timing Role: Low-drift voltage reference and amplifier driving termination MOSFETs with fast transient response. Use Value: Reduces signal reflections and timing skew by maintaining termination voltage within ±2.5% across temperature and load variation. |
Use Scenario: Supporting secondary voltage rails for CPU voltage identification (VID) decoding circuits or auxiliary logic on ATX motherboards. IC Role / Device Role / Timing Role: Standby-capable dual regulator delivering clean 1.515 V and 1.818 V for always-on management subsystems. Use Value: Enables reliable wake-on-LAN and soft-power functionality with 600–1000 µA shutdown current and POR-controlled startup. |
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 | Includes ICH-sequencing enhancements: Channel 2 hiccup mode disabled; POR does not apply to Ch2; 5 VSB-compatible VCC sourcing | Required for designs where 1.818 V rail must never fall >2 V below 3.3 V rail during power-up | Select ADM1051AJR when targeting Intel I/O Control Hub chipsets with strict sequencing mandates |
| TPS51100PWR | Single-channel 1.5 V/1.8 V dual-output controller; integrated MOSFET drivers; no SHDN1 multilevel logic; ±1% accuracy | Lacks TYPEDET compatibility and independent hiccup per channel; designed for notebook VRMs, not desktop AGP | Choose TPS51100PWR only for space-constrained, lower-accuracy portable applications without AGP interface needs |
Compared with ADM1051AJR, the ADM1051JR retains full hiccup-mode protection on both channels and supports standard 12 V-only VCC operation-making it optimal for legacy AGP desktop platforms without ICH sequencing constraints. Versus TPS51100PWR, ADM1051JR offers superior precision (±2.5% vs ±1%), true dual independent control, and motherboard-specific TYPEDET integration, at the cost of discrete MOSFET dependency.
Availability
ADM1051JR is available at Aetrix Electronics and suitable for desktop computers, servers, and workstation motherboards requiring stable component supply, precise dual-rail regulation, and AGP/ICH-compatible power control.
Supply support for ADM1051JR 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 since 1965.
The ADM1051JR belongs to Analog Devices' precision power management controller product line, engineered specifically for PC motherboard voltage regulation, AGP bus termination, and ICH-compliant rail sequencing in commercial computing platforms.
FAQ
What is the function of the SHDN1 pin on the ADM1051JR?
The SHDN1 pin on the ADM1051JR is a multilevel digital input that controls Channel 1's operating mode: <0.8 V forces shutdown; 2–3.9 V enables 1.515 V regulation; 4.3–5.3 V configures 3.3 V pass-through; and >6.2 V or floating defaults to 1.515 V. This design allows direct interfacing with PC motherboard TYPEDET signals without external logic, making ADM1051JR ideal for AGP graphics power control.
Does the ADM1051JR support hiccup-mode protection on both channels?
Yes, the ADM1051JR supports hiccup-mode fault protection on both Channel 1 and Channel 2, as confirmed in the Rev. 0 datasheet's "HICCUP MODE" table and General Description section. Unlike the ADM1051A variant-which disables hiccup on Channel 2 to meet ICH sequencing rules-the ADM1051JR implements full hiccup timing (30–90 ms hold-off, 0.5–1.5 ms on-time) identically on both channels for robust short-circuit protection in legacy desktop applications.
What external components are required to use the ADM1051JR?
The ADM1051JR requires two external N-channel MOSFETs (e.g., PHD55N03LT for Channel 1, MTD3055VL for Channel 2), feedback resistor networks on SENSE 1 and SENSE 2 to set output voltages, 100 µF+ output decoupling capacitors per channel, and a 1 µF capacitor on VCC. No external voltage-setting resistors or current-sense elements are needed-output accuracy is achieved via internal 1.2 V bandgap reference and amplifier topology, simplifying BOM for ADM1051JR-based designs.
How does the ADM1051JR achieve ±2.5% output voltage accuracy?
The ADM1051JR achieves ±2.5% output voltage accuracy through a precision 1.2 V bandgap reference, matched internal resistor ratios for feedback scaling, and high-gain (100 dB) control amplifiers that minimize error from load, line, and temperature variations. This specification is guaranteed over 0°C–70°C, 3.0–3.6 V input, and 10 mA–1 A load-validated per datasheet test conditions-not derived from typical values or simulation. The ADM1051JR maintains this accuracy without calibration or trimming components.
Can the ADM1051JR be used with 5 VSB instead of 12 V for VCC?
No-the ADM1051JR is specified for 12 V VCC operation only, with power-on reset activating at 6–9 V. While the pin-compatible ADM1051AJR supports dual-supply VCC (12 V + 5 VSB via Schottky diodes) for ICH sequencing, the ADM1051JR lacks the internal circuitry to safely operate from 5 VSB alone or in OR-ing configurations. Using 5 VSB on ADM1051JR's VCC pin risks undervoltage lockout, unstable regulation, and undefined hiccup-mode behavior-always supply ADM1051JR with 12 V ±6% as specified.
ADM1051JR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Type:
- -
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Number of Outputs:
- -
- Output Phases:
- -
- Voltage - Supply (Vcc/Vdd):
- -
- Frequency - Switching:
- -
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- -
- Clock Sync:
- -
- Serial Interfaces:
- -
- Control Features:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADM1051JR FAQ
1.How can I place an order for ADM1051JR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM1051JR 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 reliable?
The price and inventory of ADM1051JR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM1051JR is usually 5 days.
3.What payment methods are accepted for ADM1051JR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM1051JR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM1051JR?
ADM1051JR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM1051JR 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?
For technical support, including ADM1051JR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM1051JR requirements.
6.How does Aetrix verify that ADM1051JR is sourced from the original manufacturer or authorized distributors?
All ADM1051JR 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 meets industry standards.
7.What is the process for return or replacement of ADM1051JR?
All ADM1051JR units undergo pre-shipment inspection (PSI). If there is an issue with ADM1051JR, 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 part is unused and in its original packaging.
Return procedure for ADM1051JR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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