My Inquiry
My Account
Analog Devices Inc. ADM1051AJR-REEL7
- Part No.:
- ADM1051AJR-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM1051AJR-REEL7.pdf
- Description:
- IC REG BDGAP DUAL 1.5/1.8V 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ADM1051AJR-REEL7 from Analog Devices is a dual-channel precision voltage regulator controller for PC motherboard power rail generation and AGP/ICH 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 TYPEDET-compatible multilevel SHDN1 control.
For engineers reviewing the ADM1051AJR-REEL7 datasheet, ADM1051AJR-REEL7 pinout, ADM1051AJR-REEL7 application, or ADM1051AJR-REEL7 equivalent, this page provides verified functional identity, validated SOIC-8 pin mapping, confirmed dual-rail sequencing behavior per ICH requirements, hiccup timing parameters, and real-world design implications of its 12 V VCC supply and 3.3 V VIN interface.
Technical Context
The ADM1051AJR-REEL7 integrates two independent control amplifiers-each with 100 dB open-loop gain and 3 V/µs slew rate-driving external N-channel MOSFETs as source followers. 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 operates at fixed 1.818 V with no hiccup mode to meet ICH sequencing constraints.
Its 12 V VCC supply enables sufficient gate drive headroom for low-RDS(on) MOSFETs like PHD55N03LT (Ch1) and MTD3055VL (Ch2); the internal 1.2 V bandgap reference feeds both channels, and Power-On Reset (6–9 V threshold) disables Channel 1 until VCC stabilizes-Channel 2 begins regulation immediately upon valid 5 VSB presence in ADM1051A variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltages | Ch1: 1.515 V (or 3.3 V pass-through); Ch2: 1.818 V - defines AGP/ICH rail voltages without external resistors |
| Accuracy | ±2.5% over line (3.0–3.6 V), load (10 mA–1 A), and temperature (0–70°C) - ensures stable bus termination under system variation |
| Hiccup Mode | Ch1 only: 30–90 ms hold-off, 0.5–1.5 ms on-time, 20–60 ms off-time, 1:40 duty cycle - protects MOSFET during short-circuit without current-sense resistor |
| Control Amplifier | 100 dB open-loop gain, 3 V/µs slew rate, 5 µs settling time (10 mA–2 A) - enables fast transient response for dynamic CPU/GPU loads |
| Supply Requirements | VCC = 12 V ±6%; VIN = 3.3 V (±0.3 V); 5 VSB required for ADM1051A sequencing - mandates dual-supply PCB routing |
| Shutdown Current | 600–1000 µA (both channels shut down) - supports low-power standby states in desktop/server platforms |
Pinout & Package
ADM1051AJR-REEL7 is housed in an 8-lead narrow-body SOIC package (R-8, θJA = 150°C/W), compatible with standard surface-mount assembly and reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FORCE 2 (Pin 1) | Ch2 control amplifier output | Drives gate of external N-MOSFET (e.g., MTD3055VL); swing: 2–10 V relative to GND/VCC |
| SENSE 2 (Pin 2) | Ch2 feedback input | Connects to MOSFET source to close regulation loop for 1.818 V output; 50 kΩ input impedance |
| SHDN2 (Pin 3) | Ch2 enable/disable input | Active-low digital control (VIL ≤ 0.8 V, VIH ≥ 2.0 V); 50 µA internal pull-up |
| GND (Pin 4) | Signal and power ground | Low-impedance return path for sense/force signals; must be isolated from high-current load ground |
| SHDN1 (Pin 5) | Ch1 multilevel control input | Four-mode selection: <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) | Ch1 feedback input | Connects to Ch1 MOSFET source; sets 1.515 V via internal ratio; same 50 kΩ impedance as SENSE 2 |
| FORCE 1 (Pin 7) | Ch1 control amplifier output | Optimized for high-Ciss MOSFETs (e.g., PHD55N03LT); 10 V high / 2 V low swing into 10 kΩ |
| VCC (Pin 8) | Main supply input | 12 V ±6% supply; powers internal circuitry and provides gate drive headroom; requires ≥1 µF local decoupling |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent controllers | Enables simultaneous 1.515 V AGP and 1.818 V ICH rail generation on single die, reducing BOM count vs. discrete solutions |
| TYPEDET-compatible SHDN1 | Eliminates external logic for AGP mode switching: direct interface to motherboard TYPEDET signal via resistor divider |
| No external setting resistors | Fixed output voltages derived from internal precision ratios - removes trimming, improves long-term stability, simplifies layout |
| ICH-sequenced power-up (ADM1051A) | Ensures Ch2 (1.818 V) never falls >2 V below Ch1 (3.3 V) using 5 VSB-powered startup - meets Intel chipset compliance |
| Hiccup-mode protection (Ch1 only) | Self-resetting 1:40 duty-cycle pulsing during short-circuit - avoids thermal runaway without sense resistor or external IC |
Applications
| AGP Graphics Power | ICH Bus Termination |
|---|---|
Use Scenario: Regulating 1.5 V or 3.3 V supply for Accelerated Graphics Port (AGP) slots based on TYPEDET signal state. IC Role / Device Role / Timing Role: Dual-channel voltage controller providing precise, switchable rail generation with hiccup-mode fault containment. Use Value: Enables single-component support for both 4× (1.5 V) and 2× (3.3 V) AGP modes while protecting external MOSFETs from short-circuit damage. | Use Scenario: Generating tightly regulated 1.818 V termination voltage for Intel I/O Control Hub (ICH) interfaces. IC Role / Device Role / Timing Role: Precision regulator controller ensuring Ch2 rises synchronously with 3.3 V rail to avoid >2 V differential per ICH spec. Use Value: Guarantees compliant power sequencing without external delay circuits or supervisor ICs, reducing design complexity. |
| Desktop Motherboard VRM | Server Board Active Termination |
Use Scenario: Providing primary 1.515 V and 1.818 V rails for CPU core logic and chipset I/O on ATX desktop motherboards. IC Role / Device Role / Timing Role: Dual-channel controller driving cost-effective N-channel MOSFETs as source followers for low-dropout regulation. Use Value: Lowers BOM cost by eliminating P-channel MOSFETs and external feedback resistors while maintaining ±2.5% accuracy. | Use Scenario: Delivering stable termination voltage for high-speed server board interconnects requiring active bus biasing. IC Role / Device Role / Timing Role: Precision voltage controller with fast 5 µs settling time and 3 V/µs slew rate for dynamic load transients. Use Value: Maintains signal integrity across multi-GHz buses by minimizing voltage droop during burst data transfers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage regulator controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM1051JR-REEL7 | Non-A variant: lacks ICH-sequencing logic; Ch2 hiccup mode enabled; no 5 VSB startup support | Suitable for legacy AGP-only designs without ICH compliance requirements | Select ADM1051JR-REEL7 only if 5 VSB sequencing and Ch2 hiccup disablement are unnecessary |
| TPS51100PWR | Single-channel 1.5 V controller with integrated MOSFET driver; no 1.818 V output or TYPEDET support | Targeted at DDR memory termination, not AGP/ICH dual-rail systems | Use TPS51100PWR only for dedicated 1.5 V termination where dual-rail coordination is not required |
Compared with ADM1051JR-REEL7, the ADM1051AJR-REEL7 adds mandatory ICH-compliant sequencing and disables Ch2 hiccup mode; compared with TPS51100PWR, it provides true dual-rail control with AGP-specific SHDN1 logic but requires external MOSFETs and more complex layout.
Availability
ADM1051AJR-REEL7 is available at Aetrix Electronics and suitable for desktop computers, servers, and workstation motherboards requiring stable component supply, precise dual-rail voltage control, and AGP/ICH compliance.
Supply support for ADM1051AJR-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, serving industrial, automotive, communications, and computing markets.
The ADM1051A product line was designed specifically for PC motherboard power management, delivering dual-rail precision regulation with integrated sequencing and fault protection for AGP and ICH applications.
FAQ
What is the key functional difference between ADM1051AJR-REEL7 and ADM1051JR-REEL7?
The ADM1051AJR-REEL7 implements ICH-compliant power sequencing: Channel 2 starts regulation immediately from 5 VSB to prevent >2 V differential versus the 3.3 V rail, and hiccup mode is disabled on Channel 2. The ADM1051JR-REEL7 lacks this logic-its Channel 2 uses standard POR and retains hiccup protection. Both share identical pinout, SOIC-8 packaging, and 1.515 V/1.818 V nominal outputs.
How does the SHDN1 pin on ADM1051AJR-REEL7 support AGP TYPEDET functionality?
The SHDN1 pin on ADM1051AJR-REEL7 accepts four voltage levels to select operating mode: <0.8 V (shutdown), 2–3.9 V (1.5 V output), 4.3–5.3 V (3.3 V pass-through), or >6.2 V/floating (default 1.5 V). This directly interfaces with motherboard TYPEDET signals via a simple resistor divider, enabling automatic AGP mode detection without external logic-confirmed in ADM1051AJR-REEL7's functional block diagram and Table I.
What external components are required for basic operation of ADM1051AJR-REEL7?
ADM1051AJR-REEL7 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 VCC decoupling capacitor, and optional resistor dividers for SHDN1 voltage-level translation. No external feedback resistors are needed-the 1.515 V and 1.818 V outputs are set internally per ADM1051AJR-REEL7's specifications table.
Why does ADM1051AJR-REEL7 use a 12 V VCC supply instead of the 3.3 V input rail?
The 12 V VCC supply provides sufficient gate-drive headroom to fully enhance low-RDS(on) N-channel MOSFETs in source-follower configuration-critical for minimizing dropout voltage and power loss. Using 3.3 V for VCC would limit gate overdrive, increasing conduction losses and thermal stress. This architecture is explicitly validated in ADM1051AJR-REEL7's General Description and Figure 6 application circuit.
Does ADM1051AJR-REEL7 support simultaneous shutdown of both channels?
Yes-driving both SHDN1 and SHDN2 pins low (<0.8 V) places ADM1051AJR-REEL7 into full shutdown, reducing supply current to 600–1000 µA. Each channel can also be controlled independently: SHDN2 is a standard active-low enable, while SHDN1 offers multilevel control including shutdown, 1.5 V, and 3.3 V modes. This dual-control capability is documented in ADM1051AJR-REEL7's Pin Function Descriptions and Table I.
ADM1051AJR-REEL7 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:
- 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
ADM1051AJR-REEL7 FAQ
1.How can I place an order for ADM1051AJR-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM1051AJR-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 ADM1051AJR-REEL7 reliable?
The price and inventory of ADM1051AJR-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM1051AJR-REEL7 is usually 5 days.
3.What payment methods are accepted for ADM1051AJR-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM1051AJR-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM1051AJR-REEL7?
ADM1051AJR-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM1051AJR-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 ADM1051AJR-REEL7?
For technical support, including ADM1051AJR-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM1051AJR-REEL7 requirements.
6.How does Aetrix verify that ADM1051AJR-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADM1051AJR-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 ADM1051AJR-REEL7 meets industry standards.
7.What is the process for return or replacement of ADM1051AJR-REEL7?
All ADM1051AJR-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM1051AJR-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 ADM1051AJR-REEL7 part is unused and in its original packaging.
Return procedure for ADM1051AJR-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADM1051AJR-REEL7 Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
