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Analog Devices Inc./Maxim Integrated MAX8704EUB
- Part No.:
- MAX8704EUB
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX8704EUB.pdf
- Description:
- LOW-VOLTAGE LINEAR REGULATOR
- Quantity:
- Payment:
- Shipping:
Inventory:2,081
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Product details
Overview
The MAX8704EUB from Maxim Integrated is a high-current, low-voltage linear regulator controller that drives an external n-channel MOSFET to generate precise 0.5V–1.5V outputs for CPU core supplies (VMCH/VCCP) in notebook computers. It operates with VIN as low as 1.0V while using a separate 5V VCC bias supply for gate drive, features 50mV typical current limit, 1.0V power-limit threshold, and delivers up to 5A output current with ±2% load regulation.
For engineers reviewing the MAX8704EUB datasheet, MAX8704EUB pinout, MAX8704EUB application, or MAX8704EUB equivalent, this page provides verified technical context on its dual-mode feedback architecture, external MOSFET protection mechanisms, thermal shutdown behavior at +140°C, PGOOD timing with 3ms startup delay, and µMAX package layout constraints for high-current notebook power delivery.
Technical Context
The MAX8704EUB implements a dual-supply architecture: VIN (1.0V–5.5V) powers the regulated output path, while VCC (4.5V–5.5V) independently powers control circuitry and DRV gate drive. Its error amplifier compares FB voltage (0.5V reference) against a resistive divider or fixed 1.2V/1.5V setting, enabling adjustable or preset outputs without external compensation components.
Fault protection integrates three independent circuits: a 45–57mV current-sense comparator (CSP–CSN), a proprietary PLIM-based power-limit multiplier (KPLIM = 200µA/V²) that folds back current when VPWRLIMIT ≥1.0V, and thermal shutdown at +140°C with 20°C hysteresis. All protections trigger SS/EN pulldown via a 1kΩ internal resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range (VIN) | 1.0V to 5.5V - enables operation directly from low-voltage system rails like 1.2V or 1.5V intermediate supplies. |
| Output Voltage Range | 0.5V to 1.5V - supports modern CPU core voltages including VID-programmable levels down to 0.5V. |
| Current Limit Threshold | 45–57mV across sense resistor - sets peak output current; typical 50mV allows precise IOUT = 50mV/RSENSE. |
| Power-Limit Threshold | 0.90V to 1.10V at PLIM pin - triggers foldback when MOSFET power dissipation exceeds configured limit. |
| PGOOD Startup Delay | 0.5ms to 5.5ms - ensures stable regulation before signaling system readiness; typical 3ms aligns with CPU boot timing. |
| Thermal Shutdown Threshold | +140°C junction temperature - protects controller and remote MOSFET; releases at +120°C after 20°C hysteresis. |
| Soft-Start Charge Current | 4–6µA - controls ramp rate of SS/EN voltage; determines inrush current rise time via CSS capacitor. |
Pinout & Package
The MAX8704EUB is housed in a 10-pin µMAX® package (3mm × 3mm, 0.5mm pitch), optimized for high-density notebook PCB layouts with thermal pad exposure on bottom side.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Power input sense node | Senses voltage drop across external MOSFET drain-to-source; defines dropout headroom and power path. |
| 2 VCC | 5V bias supply input | Powers internal logic and DRV gate driver; must be well-regulated ≥4.5V to ensure full MOSFET turn-on. |
| 3 PGOOD | Open-drain power-good output | Signals regulation status with 3ms delay; pulled low during soft-start, fault, or shutdown. |
| 4 PLIM | Power-limit current output | Sources current proportional to MOSFET power; external RPLIM/CPLIM set limit threshold and transient response. |
| 5 SS/EN | Soft-start and enable input | Charged by 5µA current source; rising edge above 0.5V enables regulation; pulled low internally during faults. |
| 6 FB | Feedback input | Selects 1.2V (FB=GND), 1.5V (FB=VCC), or adjustable mode (FB=divider); reference = 0.5V. |
| 7 CSN | Negative current-sense input | Connects to MOSFET source terminal; forms differential pair with CSP to monitor load current. |
| 8 CSP | Positive current-sense input | Connects to sense resistor high-side; detects overcurrent when CSP–CSN ≥50mV. |
| 9 GND | Analog and power ground | Single-point ground connection for all analog references, sense paths, and thermal management. |
| 10 DRV | External MOSFET gate driver | Push-pull output swings VCC–1.1V to 1.1V; drives n-channel MOSFET gate with controlled slew rate (0.2V/µs). |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode feedback | Supports fixed 1.2V/1.5V outputs without external resistors, or 0.5V–1.5V adjustable mode via 0.5V reference. |
| Programmable power limiting | PLIM pin sources current proportional to MOSFET power; external RPLIM configures hard thermal boundary for short-circuit survival. |
| Integrated thermal protection | Shuts down at +140°C junction temperature and auto-restarts at +120°C - prevents permanent damage during sustained overload. |
| Adjustable soft-start | SS/EN pin accepts external capacitor to control current-limit ramp rate; eliminates input inrush stress on upstream converters. |
| Shutdown with discharge | Internal 10Ω FET discharges output when SS/EN is pulled low - ensures safe power-down for CPU core domains. |
Applications
| VMCH/VCCP CPU Core Supply | Notebook Mainboard Power Delivery |
|---|---|
Use Scenario: Generating 1.2V or 1.5V core voltage for Intel Pentium M or AMD Mobile Athlon processors in ultra-thin notebooks. IC Role / Device Role / Timing Role: Linear regulator controller managing external MOSFET to maintain tight DC accuracy (<±2%) under dynamic CPU load steps. Use Value: Enables use of low-VIN system rails (e.g., 1.8V) while delivering 5A with minimal dropout loss, reducing heat generation in space-constrained chassis. |
Use Scenario: Providing VMCH supply for memory controller hub in dual-core notebook platforms requiring fast transient response. IC Role / Device Role / Timing Role: High-bandwidth LDO controller with 3ms PGOOD delay synchronized to chipset reset sequencing. Use Value: Delivers <25mV undershoot during 0.5A→3.5A load transients via ceramic output capacitance optimization, meeting Intel VRD spec requirements. |
| Voltage ID (VID) Programmable Supply | Low-Voltage Bias Rail Generation |
Use Scenario: Supporting dynamic voltage scaling in mobile CPUs where VID pins select between 0.85V–1.5V operating points. IC Role / Device Role / Timing Role: Adjustable-output linear controller interpreting VID code via FB divider to set precise output voltage. Use Value: Achieves 0.5V minimum output with ±0.5% feedback accuracy, enabling deep sleep states with sub-1V core voltages. |
Use Scenario: Generating 0.9V bias rail for DDR2 memory termination in portable workstations. IC Role / Device Role / Timing Role: Low-noise linear regulator controller driving low-RDS(on) MOSFET to minimize ripple on sensitive analog reference paths. Use Value: Provides >60dB PSRR at 100kHz with ceramic input/output caps, suppressing switching noise from adjacent buck converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current linear regulator controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8705EUB | Same pinout and function but includes integrated 5V LDO for VCC generation; eliminates need for external 5V bias supply. | Reduces BOM count in systems lacking dedicated 5V rail; increases quiescent current by ~1mA due to internal LDO. | Select MAX8705EUB when board space is constrained and 5V bias is unavailable; otherwise MAX8704EUB offers lower IQ and higher efficiency. |
| TPS51116PWR | Integrated synchronous buck controller with MOSFET drivers; no external sense resistor required; supports 0.6V–3.3V outputs. | Replaces linear topology with switching solution; improves efficiency >85% at 5A but adds EMI filtering complexity. | Choose TPS51116PWR for thermally limited designs needing >90% efficiency; retain MAX8704EUB for ultra-low noise, fast transient, or legacy linear-only architectures. |
Compared with MAX8705EUB and TPS51116PWR, the MAX8704EUB uniquely balances ultra-low noise, simple layout, and external MOSFET flexibility - making it optimal for noise-sensitive CPU core supplies where efficiency is secondary to regulation precision and transient fidelity.
Availability
The MAX8704EUB is available at Aetrix Electronics and suitable for notebook computer mainboards, CPU core power delivery systems, and VMCH/VCCP voltage regulation applications requiring stable component supply across extended product lifecycles.
Supply support for MAX8704EUB 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) designs precision analog and mixed-signal ICs for power management, sensing, and interface applications in computing, industrial, and automotive markets.
The MAX8704EUB belongs to Maxim's notebook power management product line, engineered specifically for high-current, low-voltage linear regulation in space- and thermal-constrained mobile platforms.
FAQ
What is the minimum output voltage supported by the MAX8704EUB?
The MAX8704EUB supports a minimum output voltage of 0.5V when configured in adjustable mode with FB connected to CSN. This is defined by its internal 0.5V feedback reference voltage and enables compatibility with deep-sleep CPU core voltages. The device maintains ±0.5% feedback accuracy across temperature, ensuring stable regulation even at sub-1V levels. Operation below 0.5V is not supported by the MAX8704EUB architecture.
How does the MAX8704EUB protect the external MOSFET during short-circuit conditions?
The MAX8704EUB protects the external MOSFET through dual-layer fault detection: first, a 45–57mV current-limit threshold triggers immediate current regulation; second, its proprietary PLIM circuit monitors MOSFET power dissipation and folds back the current limit when the PLIM voltage exceeds 0.90–1.10V. This allows indefinite short-circuit survival without thermal runaway. The MAX8704EUB also pulls SS/EN low via a 1kΩ internal resistor to fully disable the gate driver during sustained faults.
Can the MAX8704EUB operate without a 5V bias supply?
No - the MAX8704EUB requires a dedicated 4.5V–5.5V VCC supply to power its internal control circuitry and DRV gate driver. This 5V bias rail is essential for achieving full gate drive swing (VCC–1.1V to 1.1V) needed to fully enhance low-RDS(on) n-channel MOSFETs. If no 5V rail exists, the pin-compatible MAX8705EUB - which integrates a 5V LDO - should be used instead. The MAX8704EUB cannot derive VCC from VIN.
What is the purpose of the PLIM pin on the MAX8704EUB?
The PLIM pin on the MAX8704EUB sources a current directly proportional to the instantaneous power dissipated by the external MOSFET (IPLIM = KPLIM × (VIN – VCSP) × IOUT). When the voltage across external RPLIM exceeds 0.90–1.10V, the MAX8704EUB initiates current-limit foldback to prevent thermal damage. An external capacitor (CPLIM) filters PLIM to allow brief high-power transients - a feature critical for CPU burst-load handling. Shorting PLIM to GND disables this protection.
How does the MAX8704EUB achieve fast load transient response?
The MAX8704EUB achieves fast load transient response through high-bandwidth error amplifier design and optimized loop stability with ceramic output capacitors. Typical undershoot is <25mV for 0.5A→3.5A steps, enabled by low output impedance (minimized ESR) and sufficient COUT ≥10µF/A. Its DRV output slew rate (0.2V/µs) and 5µA soft-start current source ensure controlled gate drive transitions without oscillation. Layout adherence - especially single-point grounding and short high-current paths - is essential to realize this performance in the MAX8704EUB.
MAX8704EUB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable (Programmable)
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.5V (1.2V, 1.5V)
- Voltage - Output (Max):
- 5.5V
- Voltage Dropout (Max):
- -
- Current - Output:
- 5A
- Current - Quiescent (Iq):
- 3 mA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Current Limit, Enable, Power Good, Power Limit, Soft Start
- Protection Features:
- Over Current, Over Temperature, Short Circuit, Under Voltage Lockout (UVLO)
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-uMAX
MAX8704EUB FAQ
1.How can I place an order for MAX8704EUB through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8704EUB 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 MAX8704EUB reliable?
The price and inventory of MAX8704EUB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8704EUB is usually 5 days.
3.What payment methods are accepted for MAX8704EUB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8704EUB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8704EUB?
MAX8704EUB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8704EUB 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 MAX8704EUB?
For technical support, including MAX8704EUB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8704EUB requirements.
6.How does Aetrix verify that MAX8704EUB is sourced from the original manufacturer or authorized distributors?
All MAX8704EUB 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 MAX8704EUB meets industry standards.
7.What is the process for return or replacement of MAX8704EUB?
All MAX8704EUB units undergo pre-shipment inspection (PSI). If there is an issue with MAX8704EUB, 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 MAX8704EUB part is unused and in its original packaging.
Return procedure for MAX8704EUB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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