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Analog Devices Inc./Maxim Integrated MAX1638EAG+TGA5
- Part No.:
- MAX1638EAG+TGA5
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- -
- Datasheet:
-
MAX1638EAG+TGA5.pdf
- Description:
- INTEGRATED CIRCUIT
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Product details
Overview
MAX1638EAG+TGA5 from Maxim Integrated is a high-speed, synchronous step-down DC-DC controller designed for CPU core power delivery in high-end computing systems. It delivers over 35A output current from 1.3V to 3.5V with ±1% total output voltage accuracy, operates from a +5V ±10% input supply, and achieves >90% efficiency using external N-channel MOSFETs. Its GlitchCatcher™ circuit enables sub-100ns load-transient recovery in Pentium Pro™, Pentium II™, and Alpha™ platforms.
For engineers reviewing the MAX1638EAG+TGA5 datasheet, MAX1638EAG+TGA5 pinout, MAX1638EAG+TGA5 application, or MAX1638EAG+TGA5 equivalent, key selection criteria include its digitally programmable output (5-bit DAC), pin-selectable switching frequency (300/600/1000 kHz), ±1% FB accuracy over line/load, crowbar overvoltage protection, and compliance with Intel VRM 8.2 specification.
Technical Context
The MAX1638EAG+TGA5 implements current-mode PWM control with slope compensation, enabling cycle-by-cycle current limiting and fast transient response. Its internal 3.5V ±1% reference (REF) serves both regulation and system-level referencing, while the GlitchCatcher™ circuit injects auxiliary current via PDRV/NDRV outputs during output droop exceeding 2%.
It supports high-side current sensing (CSH/CSL), digital output programming (D0–D4), and loop gain adjustment (LG pin for 0.5%/1%/2% AC load regulation). The DH/DL gate drivers deliver 2A peak current with 0.7Ω typical on-resistance, and the BST bootstrap circuit enables floating high-side N-MOSFET drive without external charge pumps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 1.3V to 3.5V, digitally set via 5-bit D0–D4 inputs per Intel VRM 8.2 codes |
| Output Accuracy | ±1% over line, load, and temperature - ensures stable CPU core voltage under dynamic load |
| Max Output Current | >35A - supports high-power Pentium Pro/II and Alpha processors |
| Switching Frequency | 300kHz / 600kHz / 1MHz (pin-selectable) - enables trade-offs between inductor size and transient performance |
| Efficiency | >90% - achieved via synchronous rectification with external N-MOSFETs |
| Reference Voltage | 3.5V ±1%, 10mV load regulation up to 100µA - usable as system-wide precision reference |
| GlitchCatcher Response | 75ns typical PDRV/NDRV propagation delay - recovers from fast load transients before buck inductor reacts |
| Overvoltage Protection | Crowbar action at +200mV above regulation point - forces low-side MOSFET to 100% duty cycle for rapid fault shutdown |
Pinout & Package
MAX1638EAG+TGA5 is housed in a 24-pin SSOP package (0.154" wide, JEDEC MO-153), lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D4 | Digital output voltage select inputs | 5-bit code sets FB regulation point from 1.3V to 3.5V; internally pulled up to VCC |
| FREQ | Switching frequency select | AGND = 300kHz, REF = 600kHz, VCC = 1MHz - no external components needed |
| DH / DL | High-side / low-side gate drivers | DH floats with LX node (BST-referenced); DL swings PGND–VDD; both drive external N-MOSFETs |
| CSH / CSL | Current-sense differential inputs | Accept high-side or low-side sense resistor; enable cycle-by-cycle current limiting and foldback protection |
| PWROK | Open-drain power-good output | Asserts high when FB is within –6% to +8% of target - used for CPU reset sequencing |
| REF | Internal 3.5V reference output | ±1% accuracy, 100µA sink/source capability - bypassed with ≥0.1µF ceramic to AGND |
| LG | Loop gain control input | VCC/REF/AGND selects 2%/1%/0.5% AC load regulation - trades transient response vs. capacitor count |
| BST | Bootstrap capacitor connection | Drives DH gate via flying-capacitor charge pump; requires 0.1µF ceramic + Schottky diode |
Key Features
| Feature | Design Value |
|---|---|
| Digitally programmable output | 5-bit DAC (D0–D4) sets 1.3V–3.5V in 50mV steps, fully compatible with Intel VRM 8.2 |
| GlitchCatcher™ transient boost | Sub-100ns PDRV/NDRV response injects auxiliary current directly into output, bypassing inductor lag |
| Synchronous rectification support | DH/DL drivers deliver 2A peak with 0.7Ω typical RON, enabling >90% efficiency with low-RDS(ON) N-MOSFETs |
| Crowbar overvoltage protection | Turns on low-side MOSFET at 100% duty when output exceeds regulation by 200mV - prevents CPU damage |
| Intel VRM 8.2 compliance | Meets timing, accuracy, and sequencing requirements for Pentium Pro/II, Alpha, and K6 platforms |
| Digital soft-start | 1536-cycle ramp raises current limit in four 25mV steps - eliminates input surge during power-up |
Applications
| Desktop CPU Power | Workstation Core Supply |
|---|---|
|
Use Scenario: Regulating core voltage for Pentium II™ and K6™ CPUs in high-performance desktop motherboards with dynamic clock scaling. IC Role / Device Role / Timing Role: Primary step-down controller managing feedback, current sensing, gate drive, and power-good signaling. Use Value: ±1% output accuracy and GlitchCatcher™ ensure stable operation during GHz-scale clock transitions and multi-amp load steps. |
Use Scenario: Delivering 35A+ at 1.8V to dual-processor Alpha™ workstations requiring tight voltage tolerance and fast transient recovery. IC Role / Device Role / Timing Role: Synchronous buck controller with high-current DH/DL drivers and crowbar OVP for fault containment. Use Value: 600kHz/1MHz switching enables compact 0.47µH inductors and reduces bulk capacitance by 40% vs. 300kHz designs. |
| LAN Server VRM | GTL Bus Termination |
|
Use Scenario: Providing regulated 2.5V/3.3V CPU core power in rack-mounted LAN servers with thermal and layout constraints. IC Role / Device Role / Timing Role: VRM 8.2-compliant controller interfacing with CPU VID lines and system PMIC for coordinated power sequencing. Use Value: LG pin-selectable AC load regulation (0.5%–2%) allows optimization of output capacitor count vs. transient overshoot in dense server PCBs. |
Use Scenario: Generating precise 1.3V–1.8V termination voltage for GTL+ bus interfaces in high-speed chipset designs. IC Role / Device Role / Timing Role: Low-noise, digitally adjustable buck controller with Kelvin-sense FB input for millivolt-level stability. Use Value: 10mV reference load regulation and 0.1µA FB input bias minimize error from trace resistance and board parasitics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1639EAG+ | Same pinout and feature set, but rated for –40°C to +125°C industrial temp range; higher max VDD (6V) | Required for extended-temperature server backplanes or telecom baseband cards | Select MAX1639EAG+ when operating ambient exceeds +85°C or input rail may exceed 5.5V |
| ISL6522CRZ | 3-phase controller with integrated MOSFET drivers; supports up to 60A; lacks GlitchCatcher™ and digital VID | Used in dual-CPU Xeon® platforms where phase interleaving reduces ripple and EMI | Choose ISL6522CRZ for multi-phase scalability; MAX1638EAG+TGA5 remains optimal for single-phase, cost-sensitive VRM 8.2 designs |
Compared with MAX1639EAG+, MAX1638EAG+TGA5 offers identical functionality at lower cost and standard temperature grade, while ISL6522CRZ provides higher current capacity and multi-phase capability at the expense of digital VID compatibility and transient-response acceleration features.
Availability
MAX1638EAG+TGA5 is available at Aetrix Electronics and suitable for desktop computers, workstation CPU power, LAN servers, and GTL bus termination requiring stable component supply across long production lifecycles.
Supply support for MAX1638EAG+TGA5 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, industrial, and communications markets.
The MAX1638EAG+TGA5 belongs to Maxim's CPU power controller product line, engineered specifically for Intel VRM 8.2-compliant single-phase core voltage regulation in high-clock-frequency computing platforms.
FAQ
What is the operating temperature range for MAX1638EAG+TGA5?
The MAX1638EAG+TGA5 is specified for operation from –40°C to +85°C ambient temperature. This range covers standard commercial and industrial computing environments including desktop motherboards, workstations, and LAN servers. The device uses BiCMOS process technology to maintain ±1% output accuracy and stable GlitchCatcher™ response across this full range, with electrical characteristics guaranteed per the datasheet's TA = –40°C to +85°C test conditions.
Does MAX1638EAG+TGA5 support Intel VRM 8.2 compliance?
Yes, MAX1638EAG+TGA5 is explicitly designed and tested to comply with Intel VRM 8.2 specifications. Its 5-bit D0–D4 digital interface matches VRM 8.2 VID codes (e.g., 00101 = 1.8V), its ±1% output accuracy meets required tolerance, and its power-good (PWROK) window (–6% to +8%) and soft-start timing align with VRM 8.2 sequencing requirements for Pentium Pro™ and Pentium II™ platforms.
How does the GlitchCatcher™ circuit in MAX1638EAG+TGA5 improve transient response?
The GlitchCatcher™ circuit in MAX1638EAG+TGA5 improves transient response by activating PDRV and NDRV outputs within 75ns when FB drops >2% below regulation. This injects auxiliary current directly from VIN or ground into the output node, bypassing the buck inductor's inherent delay. As shown in MAX1638-03 test waveforms, it reduces output droop by up to 60% compared to non-GlitchCatcher operation under 30A/μs load steps.
What package type is used for MAX1638EAG+TGA5?
MAX1638EAG+TGA5 uses a 24-pin SSOP (Shrink Small Outline Package) with 0.154" body width and 0.025" pitch, compliant with JEDEC MO-153. The "+TGA5" suffix denotes tape-and-reel packaging with lead-free (Pb-free) finish and RoHS compliance. This package supports automated SMT assembly and provides adequate thermal dissipation for continuous 35A operation with proper PCB copper pour.
Can MAX1638EAG+TGA5 be used with high-side current sensing?
Yes, MAX1638EAG+TGA5 supports high-side current sensing via CSH and CSL pins, whose common-mode input range extends to VCC. This configuration places the sense resistor between VIN and the high-side MOSFET drain, reducing I²R loss by the duty cycle factor. Layout guidelines specify Kelvin routing, RC filtering (e.g., 39Ω + 3.3nF), and placement within 2.5mm of the IC to reject noise - confirmed in Figure 5 of the datasheet.
MAX1638EAG+TGA5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Applications:
- -
- Voltage - Input:
- -
- Number of Outputs:
- -
- Voltage - Output:
- -
- Operating Temperature:
- -
- Grade:
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- Qualification:
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- Mounting Type:
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- Supplier Device Package:
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MAX1638EAG+TGA5 FAQ
1.How can I place an order for MAX1638EAG+TGA5 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1638EAG+TGA5 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 MAX1638EAG+TGA5 reliable?
The price and inventory of MAX1638EAG+TGA5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1638EAG+TGA5 is usually 5 days.
3.What payment methods are accepted for MAX1638EAG+TGA5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1638EAG+TGA5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1638EAG+TGA5?
MAX1638EAG+TGA5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1638EAG+TGA5 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 MAX1638EAG+TGA5?
For technical support, including MAX1638EAG+TGA5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1638EAG+TGA5 requirements.
6.How does Aetrix verify that MAX1638EAG+TGA5 is sourced from the original manufacturer or authorized distributors?
All MAX1638EAG+TGA5 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 MAX1638EAG+TGA5 meets industry standards.
7.What is the process for return or replacement of MAX1638EAG+TGA5?
All MAX1638EAG+TGA5 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1638EAG+TGA5, 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 MAX1638EAG+TGA5 part is unused and in its original packaging.
Return procedure for MAX1638EAG+TGA5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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