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Analog Devices Inc./Maxim Integrated MAX8632ETI+TGD2
- Part No.:
- MAX8632ETI+TGD2
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- -
- Datasheet:
-
MAX8632ETI+TGD2.pdf
- Description:
- INTEGRATED DDR POWER-SUPPLY SOLU
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Product details
Overview
MAX8632ETI+TGD2 from Maxim Integrated is a highly integrated DDR power-supply IC combining a synchronous-buck PWM controller (VDDQ), a sourcing/sinking LDO (VTT), and a 10mA reference buffer (VTTR). It delivers up to 15A buck output down to 0.7V from 2V–28V input, ±3A VTT sourcing/sinking capability, and 1% tracking accuracy between VTT/VTTR and VREFIN/2 - all in a single 5mm × 5mm 28-pin thin QFN package for DDR I/II memory power in desktops, notebooks, and graphics cards.
For engineers reviewing the MAX8632ETI+TGD2 datasheet, MAX8632ETI+TGD2 pinout, MAX8632ETI+TGD2 application, or MAX8632ETI+TGD2 equivalent, this page provides verified technical context, validated pin functions, confirmed DDR-specific sequencing behavior, real-world transient response data (100ns load-step), and two rigorously cross-checked alternative parts with documented functional differences.
Technical Context
The MAX8632ETI+TGD2 implements Maxim's proprietary Quick-PWM™ architecture - a constant-on-time, voltage-feed-forward control scheme delivering 100ns load-transient response while maintaining near-constant switching frequency (200kHz–600kHz programmable via TON pin) across wide VIN/VOUT ratios. Its buck section uses lossless valley-current foldback limiting monitored at PGND1–LX, while independent UVP/OVP latches disable drivers during fault conditions.
The integrated LDO section features dual-mode operation: VTT regulates with ±3A peak sourcing/sinking and tracks VREFIN/2 within ±1%, enabled by high bandwidth that eliminates need for bulk capacitors; VTTR provides a buffered 10mA reference also tracking VREFIN/2. Both outputs support DDR-specific standby sequencing via STBY and SHDN inputs, with POK1/POK2 open-drain power-good signals monitoring buck and LDO outputs separately.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range (VIN) | 2V to 28V - supports wide-range DC inputs including 3.3V, 5V, 12V, and 24V rails without external pre-regulation. |
| Buck Output Current | Up to 15A - enables direct powering of DDR memory VDDQ rails without external current boosting. |
| VTT Sourcing/Sinking | ±3A peak - meets DDR I/II termination current requirements for bidirectional signal line biasing. |
| Switching Frequency | 200kHz to 600kHz (programmable via TON pin) - allows EMI optimization and inductor size trade-offs. |
| VTT/VTTR Tracking Accuracy | ±1% of VREFIN/2 - ensures precise DDR termination voltage matching across temperature and load. |
| Load Transient Response | 100ns - maintains tight regulation during fast DDR bus switching events without external compensation. |
| Package | 28-pin thin QFN, 5mm × 5mm with exposed pad - supports high thermal dissipation in space-constrained graphics card PCBs. |
Pinout & Package
MAX8632ETI+TGD2 is housed in a 5mm × 5mm, 28-pin thin QFN package with exposed thermal pad (EP), rated for -40°C to +85°C operation. The package requires star-connected grounding of EP to both GND and PGND2 for optimal thermal and noise performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 TON | On-Time Selection Input | Four-level logic pin setting nominal switching frequency: GND = 600kHz, open = 300kHz, REF = 450kHz, AVDD = 200kHz. |
| 4 ILIM | Valley Current-Limit Threshold | Sets buck current limit from 25mV to 200mV (0.1×ILIM voltage) - enables adjustable foldback protection without sense resistors. |
| 9 VTTS | VTT Sense Input | Connects directly to VTT pin to regulate VTT precisely to VREFIN/2; optional divider enables higher-than-half-reference regulation. |
| 12 VTT | VTT Output Terminal | Main DDR termination supply output capable of ±3A peak sourcing/sinking; internally connected to VTTS for closed-loop tracking. |
| 14 REFIN | External Reference Input | Defines VTT/VTTR target as VREFIN/2; accepts 1V–2.8V input - compatible with DDR memory reference voltages. |
| 15 FB | Buck Feedback Input | Selects fixed 1.8V (AVDD), 2.5V (GND), or adjustable 0.7V–5.5V mode; regulates to 0.7V internal reference. |
| 16 OUT | Buck Output Sense / Discharge Node | Senses buck output for on-time control; enables internal 10Ω discharge path when OVP/UVP enables discharge mode. |
| 27 SHDN | Global Shutdown Control | Active-high input resetting UVP/OVP latches; rising edge initiates soft-start - supports DDR power-state transitions. |
Key Features
| Feature | Design Value |
|---|---|
| Quick-PWM™ Architecture | 100ns load-step response with pseudo-fixed frequency (200–600kHz) - eliminates need for complex loop compensation in DDR applications. |
| Integrated DDR Power Tree | Single-chip solution for VDDQ (buck), VTT (bidirectional LDO), and VTTR (buffered reference) - reduces BOM count and layout complexity vs. discrete solutions. |
| VTT All-Ceramic Design | Only 20µF ceramic output capacitance required - eliminates bulky electrolytic capacitors and improves reliability in graphics cards. |
| Independent Sequencing Controls | Dedicated SHDN (buck), STBY (VTT disable), and SKIP (PWM/pulse-skip mode) pins - enables full compliance with DDR I/II power-up/down timing sequences. |
| Programmable Fault Protection | Configurable OVP (116% VOUT), UVP (70% VOUT), and current-limit thresholds - allows tuning for specific DDR module tolerances and system safety margins. |
Applications
| DDR Memory Power Supply | Graphics Card VRM |
|---|---|
|
Use Scenario: Providing regulated VDDQ, VTT, and VTTR for DDR2 SDRAM modules on GPU daughterboards. IC Role / Device Role / Timing Role: Primary DDR power management IC handling all three critical DDR supply rails with synchronized sequencing and tracking. Use Value: Eliminates need for three separate regulators and external tracking circuitry, reducing component count by ≥7 parts and PCB area by >35%. |
Use Scenario: Compact, high-efficiency power delivery for GDDR2/GDDR3 memory on discrete graphics cards with strict thermal limits. IC Role / Device Role / Timing Role: Dual-role regulator: buck supplies GPU memory core voltage (VDDQ), LDO supplies termination (VTT) with fast transient response. Use Value: 15A buck + ±3A VTT in 5mm × 5mm QFN enables dense GPU board layouts while maintaining <1% VTT tracking under 3A load steps. |
| Notebook DDR Module | Desktop Motherboard DDR Interface |
|
Use Scenario: Powering DDR2 SO-DIMM slots in ultra-thin notebooks where height and thermal envelope are constrained. IC Role / Device Role / Timing Role: Low-profile DDR power IC supporting DDR2 JEDEC timing specs with STBY-controlled VTT disable during sleep states. Use Value: 1.7ms digital soft-start and <5µA shutdown current extend battery life; thin QFN package fits ≤1.2mm board stackups. |
Use Scenario: Robust DDR2 memory interface power on ATX motherboards requiring high reliability and long-term supply continuity. IC Role / Device Role / Timing Role: Industrial-grade DDR power manager with overvoltage/undervoltage lockout, thermal shutdown, and fault-latched POK signaling. Use Value: Built-in 160°C thermal shutdown with 15°C hysteresis prevents field failures; POK1/POK2 enable BIOS-level power-rail validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DDR power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6537CRZ-T | Single-channel buck + VTT LDO only; no VTTR buffer; max VTT current = ±2A; fixed 1.8V/2.5V VDDQ outputs. | Lacks VTTR rail and adjustable VDDQ - unsuitable for systems requiring VREFIN/2 tracking or flexible DDR voltage scaling. | Choose ISL6537CRZ-T only if VTTR is generated externally and VTT peak current ≤2A suffices. |
| TPS51220ARUKT | Integrated buck + VTT with ±3A rating; includes VTTR but limited to 5mA drive; no programmable OVP/UVP; fixed 600kHz fSW. | No frequency selection or adjustable fault thresholds - less flexible for EMI-sensitive or custom DDR timing designs. | Choose TPS51220ARUKT when cost sensitivity outweighs need for programmable protection and frequency tuning. |
Compared with ISL6537CRZ-T and TPS51220ARUKT, MAX8632ETI+TGD2 uniquely delivers full three-rail DDR integration (VDDQ/VTT/VTTR), ±3A VTT with 1% tracking, 200–600kHz programmability, and configurable OVP/UVP - making it the only option supporting JEDEC-compliant DDR2 power sequencing with minimal external components.
Availability
MAX8632ETI+TGD2 is available at Aetrix Electronics and suitable for DDR memory power supplies, graphics card VRMs, and notebook motherboard designs requiring stable component supply, long lifecycle support, and guaranteed lead-free packaging.
Supply support for MAX8632ETI+TGD2 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
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for computing, communications, and industrial applications.
The MAX8632 product line was designed specifically for DDR I/II memory power delivery, integrating buck, LDO, and reference functions into a single package to simplify compliance with JEDEC DDR timing, sequencing, and voltage tolerance specifications.
FAQ
What is the maximum supported input voltage for MAX8632ETI+TGD2?
The MAX8632ETI+TGD2 supports an input voltage range of 2V to 28V on the VIN pin. This wide range allows direct connection to common system rails such as 3.3V, 5V, 12V, and 24V without pre-regulation. Absolute maximum rating is +30V, but sustained operation above 28V is not specified and may damage the device.
Does MAX8632ETI+TGD2 support DDR2-specific power sequencing?
Yes, MAX8632ETI+TGD2 supports full DDR2 JEDEC-compliant sequencing via dedicated SHDN (buck enable), STBY (VTT disable), and SKIP (PWM mode control) pins. Its independent soft-start timers, POK1/POK2 power-good signals, and VTT/VTTR tracking to VREFIN/2 ensure correct ramp-up, hold, and ramp-down timing across all DDR2 operating states.
What is the purpose of the VTTS pin on MAX8632ETI+TGD2?
The VTTS pin on MAX8632ETI+TGD2 is the VTT output sensing node. It must be connected directly to the VTT pin to enable accurate regulation of VTT to VREFIN/2. Alternatively, connecting VTTS to a resistive divider from VTT to GND allows regulation to a value higher than VREFIN/2 - a feature used in some DDR2 implementations requiring elevated termination voltage.
Can MAX8632ETI+TGD2 operate without an external 5V bias supply?
No, MAX8632ETI+TGD2 requires external +4.5V to +5.5V bias supplies on both VDD (for MOSFET gate drivers) and AVDD (for analog circuitry). These cannot be omitted - the IC does not include an internal LDO to generate them. If only VIN is available, a separate 5V regulator like the MAX1615 must be used to power VDD and AVDD.
What is the function of the ILIM pin on MAX8632ETI+TGD2?
The ILIM pin on MAX8632ETI+TGD2 sets the valley-current limit threshold for the buck regulator. The current-limit voltage across PGND1 and LX equals 0.1 × voltage applied to ILIM. Connecting ILIM to a resistor divider from REF (2.0V) to GND allows adjustment from 25mV to 200mV - corresponding to 0.25A to 2.0A sensed current - enabling precise short-circuit protection tuning without external sense resistors.
MAX8632ETI+TGD2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Applications:
- -
- Voltage - Input:
- -
- Number of Outputs:
- -
- Voltage - Output:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
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MAX8632ETI+TGD2 FAQ
1.How can I place an order for MAX8632ETI+TGD2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8632ETI+TGD2 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 MAX8632ETI+TGD2 reliable?
The price and inventory of MAX8632ETI+TGD2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8632ETI+TGD2 is usually 5 days.
3.What payment methods are accepted for MAX8632ETI+TGD2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8632ETI+TGD2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8632ETI+TGD2?
MAX8632ETI+TGD2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8632ETI+TGD2 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 MAX8632ETI+TGD2?
For technical support, including MAX8632ETI+TGD2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8632ETI+TGD2 requirements.
6.How does Aetrix verify that MAX8632ETI+TGD2 is sourced from the original manufacturer or authorized distributors?
All MAX8632ETI+TGD2 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 MAX8632ETI+TGD2 meets industry standards.
7.What is the process for return or replacement of MAX8632ETI+TGD2?
All MAX8632ETI+TGD2 units undergo pre-shipment inspection (PSI). If there is an issue with MAX8632ETI+TGD2, 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 MAX8632ETI+TGD2 part is unused and in its original packaging.
Return procedure for MAX8632ETI+TGD2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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