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Analog Devices Inc. ADM1051AJRZ-REEL7
- Part No.:
- ADM1051AJRZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM1051AJRZ-REEL7.pdf
- Description:
- IC REG LINEAR PREC DUAL VOLTAGE
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
ADM1051AJRZ-REEL7 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, supports external N-channel MOSFETs, and features hiccup-mode fault protection. Used in desktop computer VRMs to regulate core logic supply rails.
For engineers reviewing the ADM1051AJRZ-REEL7 datasheet, ADM1051AJRZ-REEL7 pinout, ADM1051AJRZ-REEL7 application, or ADM1051AJRZ-REEL7 equivalent, key selection criteria include dual independent control amplifier performance, TYPEDET-compatible multilevel SHDN1 voltage selection, hiccup-mode timing parameters, SOIC-8 thermal characteristics, and ICH sequencing compliance for 1.8 V vs. 3.3 V rail tracking.
Technical Context
The ADM1051AJRZ-REEL7 integrates two independent control amplifiers with a shared 1.2 V bandgap reference, each driving external N-channel MOSFETs in source-follower configuration. 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 optimized for ICH sequencing constraints.
It implements hiccup-mode protection on Channel 1 only (hold-off time 60 ms, on-time 1.0 ms, off-time 40 ms), excludes hiccup on Channel 2 per ADM1051A specification, and uses POR threshold (6–9 V on VCC) to enable output startup-though Channel 2 begins regulating immediately upon sufficient gate drive, ensuring it never falls >2 V below the 3.3 V rail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage (Ch1) | 1.515 V nominal; selectable to 3.3 V pass-through via SHDN1 voltage level |
| Output Voltage (Ch2) | 1.818 V fixed; designed to track 3.3 V rail within ≤2 V differential for ICH compliance |
| 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 to load steps up to 2 A |
| Hiccup Mode (Ch1) | Hold-off time 60 ms; 1:40 duty cycle (1.0 ms on / 40 ms off) for short-circuit protection |
| Supply Current | 4.0 mA typical in normal operation; 1000 µA max in shutdown mode |
| Package | 8-Lead SOIC (R-8); θJA = 150°C/W; rated for 0°C to 70°C commercial operation |
Pinout & Package
ADM1051AJRZ-REEL7 is housed in an 8-lead narrow-body SOIC package (R-8), with exposed pad not present and standard JEDEC MS-012AC dimensions (5.00 mm × 4.00 mm × 1.50 mm). Thermal resistance θJA = 150°C/W; maximum continuous power dissipation at TA = 70°C is 650 mW.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FORCE 2 (Pin 1) | Channel 2 control amplifier output | Drives gate of external N-MOSFET; swing 2 V to 10 V relative to GND/VCC |
| SENSE 2 (Pin 2) | Channel 2 feedback input | Connects to MOSFET source to close regulation loop for 1.818 V output |
| SHDN2 (Pin 3) | Channel 2 shutdown control | Active-low digital input; internal 50 µA pull-up; forces FORCE2 low when asserted |
| GND (Pin 4) | Device ground reference | Common return for all analog and digital circuitry; must be low-impedance path to load ground |
| SHDN1 (Pin 5) | Channel 1 multilevel control | Voltage-selectable: <0.8 V (shutdown), 2–3.9 V (1.5 V), 4.3–5.3 V (3.3 V pass), >6.2 V/floating (1.5 V) |
| SENSE 1 (Pin 6) | Channel 1 feedback input | Connects to MOSFET source to close regulation loop for 1.515 V or 3.3 V output |
| FORCE 1 (Pin 7) | Channel 1 control amplifier output | Drives gate of external N-MOSFET; optimized for high-capacitance, low-RDS(on) devices like PHD55N03LT |
| VCC (Pin 8) | Main supply input | 12 V nominal supply; POR activates above 6–9 V; powers all internal circuitry and amplifier stages |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent control channels | Enables simultaneous regulation of 1.515 V AGP logic rail and 1.818 V ICH rail without cross-talk or shared feedback |
| TYPEDET-compatible SHDN1 interface | Eliminates need for external logic or voltage translators to support AGP 2×/4× mode detection via motherboard TYPEDET signal |
| No external setting resistors | Fixed 1.515 V and 1.818 V outputs set by internal resistor ratios - reduces BOM count and layout sensitivity |
| Hiccup-mode fault protection (Ch1 only) | Self-resetting 1:40 duty-cycle pulsing limits MOSFET power dissipation during sustained short-circuit without external current sense |
| ICH-sequenced power-up (ADM1051A) | Ensures Channel 2 reaches regulation before Channel 1 enables, preventing >2 V differential between 1.818 V and 3.3 V rails |
Applications
| AGP Graphics Power Supply | ICH Core Voltage Regulation |
|---|---|
Use Scenario: Regulating 1.5 V or 3.3 V supply for AGP graphics controllers based on motherboard TYPEDET signal state. IC Role / Device Role / Timing Role: Dual-channel controller providing precise, switchable output voltage with hiccup-mode protection for GPU rail stability. Use Value: Eliminates need for separate regulators or logic-level translators; supports both AGP 2× and 4× modes using single ADM1051AJRZ-REEL7 device. | Use Scenario: Generating stable 1.818 V core voltage for Intel I/O Control Hub 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 during power-up and steady-state operation. Use Value: Meets ICH specification requirements without external sequencing ICs or discrete timing components. |
| Desktop Motherboard VRM | Active Bus Termination |
Use Scenario: Implementing cost-effective, space-efficient dual-rail VRM on ATX or microATX motherboards using external N-MOSFETs. IC Role / Device Role / Timing Role: Controller driving low-cost N-channel MOSFETs as source-followers, leveraging high gate-drive capability (3 V/µs slew rate) for fast load transients. Use Value: Reduces component cost versus P-channel solutions and simplifies compensation versus common-source topologies. | Use Scenario: Providing dynamically regulated termination voltage for high-speed parallel buses (e.g., AGP, PCI-X) to minimize signal reflections. IC Role / Device Role / Timing Role: Precision voltage reference and amplifier delivering stable, low-noise termination bias matching bus signaling levels. Use Value: Maintains signal integrity across temperature and load variations with ±2.5% output accuracy and 5 µs closed-loop settling time. |
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 |
|---|---|---|---|
| ADM1051JRZ-REEL7 | Non-A version; lacks ICH sequencing logic - Channel 2 hiccup mode enabled, no 5 VSB-assisted startup | Supports general-purpose dual-rail regulation but cannot guarantee ≤2 V differential between 1.818 V and 3.3 V rails | Select when TYPEDET compatibility and AGP mode switching are required but ICH sequencing is not mandated |
| TPS51100PWR | Single-channel 1.5 V controller with integrated MOSFET driver; no SHDN1 multilevel function or hiccup mode | Designed for DDR memory termination, not AGP/ICH rail generation; requires external feedback resistors | Choose only for dedicated 1.5 V termination where dual-channel integration and hiccup protection are unnecessary |
Compared with ADM1051JRZ-REEL7, the ADM1051AJRZ-REEL7 adds ICH-compliant sequencing and disables Channel 2 hiccup mode to prevent premature shutdown; versus TPS51100PWR, it provides true dual-rail control, fixed-voltage accuracy without external resistors, and robust fault handling for motherboard VRM use cases.
Availability
ADM1051AJRZ-REEL7 is available at Aetrix Electronics and suitable for desktop computer motherboards, server power management subsystems, and workstation AGP/ICH voltage regulation requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for ADM1051AJRZ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers worldwide.
The ADM1051A product line was developed specifically for precision dual-rail voltage control in PC motherboard power architectures, addressing AGP graphics and I/O Control Hub sequencing requirements with integrated protection and minimal external components.
FAQ
What is the key functional difference between ADM1051AJRZ-REEL7 and ADM1051JRZ-REEL7?
The ADM1051AJRZ-REEL7 implements ICH-compliant power sequencing: Channel 2 begins regulating immediately upon 5 VSB availability, ensuring it never falls more than 2 V below the 3.3 V rail, and disables hiccup mode on Channel 2. The ADM1051JRZ-REEL7 lacks this logic - both channels use identical hiccup behavior and POR timing. This makes ADM1051AJRZ-REEL7 mandatory for designs targeting Intel I/O Control Hub chipsets requiring strict rail tracking.
How does the SHDN1 pin on ADM1051AJRZ-REEL7 support AGP TYPEDET functionality?
The SHDN1 pin on ADM1051AJRZ-REEL7 is a multilevel input that interprets voltage thresholds to select operating mode: <0.8 V shuts down Channel 1; 2–3.9 V enables 1.515 V output; 4.3–5.3 V forces 3.3 V pass-through; >6.2 V or open-circuit defaults to 1.515 V. This directly maps to AGP TYPEDET states (0 V = 1.5 V, floating = 3.3 V), allowing motherboard designers to implement mode selection using simple resistor dividers without additional logic ICs.
What external MOSFETs are recommended for use with ADM1051AJRZ-REEL7 Channel 1 and Channel 2?
Analog Devices specifies PHD55N03LT for Channel 1 - optimized for low RDS(on) and high gate capacitance to minimize drop in 3.3 V pass-through mode - and MTD3055VL or PHB11N06LT for Channel 2. These N-channel devices operate as source-followers driven by the ADM1051AJRZ-REEL7's FORCE outputs, enabling cost-effective, stable regulation without external current-sense circuitry or P-channel complexity.
Does ADM1051AJRZ-REEL7 require external feedback resistors to set its output voltages?
No. ADM1051AJRZ-REEL7 uses internal precision resistor networks to fix Channel 1 at 1.515 V (or 3.3 V pass-through) and Channel 2 at 1.818 V. The SENSE inputs connect directly to the MOSFET source terminals to close the feedback loop, eliminating external voltage-setting resistors and reducing BOM count, layout sensitivity, and calibration drift over temperature.
What is the purpose of hiccup-mode protection on ADM1051AJRZ-REEL7, and on which channel is it active?
Hiccup-mode protection on ADM1051AJRZ-REEL7 is a self-resetting fault response that pulses the Channel 1 control amplifier output on/off with a 1:40 duty cycle (1.0 ms on / 40 ms off) when output voltage drops 20% below nominal - typically due to short-circuit. It is disabled on Channel 2 per ADM1051A specification to prevent violation of the ≤2 V differential requirement between the 1.818 V and 3.3 V rails during fault conditions.
ADM1051AJRZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- No
- 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
ADM1051AJRZ-REEL7 FAQ
1.How can I place an order for ADM1051AJRZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM1051AJRZ-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 ADM1051AJRZ-REEL7 reliable?
The price and inventory of ADM1051AJRZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM1051AJRZ-REEL7 is usually 5 days.
3.What payment methods are accepted for ADM1051AJRZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM1051AJRZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM1051AJRZ-REEL7?
ADM1051AJRZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM1051AJRZ-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 ADM1051AJRZ-REEL7?
For technical support, including ADM1051AJRZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM1051AJRZ-REEL7 requirements.
6.How does Aetrix verify that ADM1051AJRZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADM1051AJRZ-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 ADM1051AJRZ-REEL7 meets industry standards.
7.What is the process for return or replacement of ADM1051AJRZ-REEL7?
All ADM1051AJRZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM1051AJRZ-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 ADM1051AJRZ-REEL7 part is unused and in its original packaging.
Return procedure for ADM1051AJRZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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