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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:
- IC REG LINEAR POS ADJ 5A 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,218
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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 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 threshold, 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, key selection criteria include its external-MOSFET architecture, dual-mode feedback (1.2V/1.5V fixed or adjustable), programmable soft-start, PGOOD with 3ms startup delay, and integrated thermal/current/power-limit protection for VMCH/VCCP rail generation.
Technical Context
The MAX8704EUB+ implements a two-supply architecture: VIN powers the output path (1.0V–5.5V), while VCC (4.5V–5.5V) powers control logic and DRV gate drive. Its error amplifier compares FB voltage (0.5V reference) against a resistive divider or fixed VCC/GND connection to regulate output.
Fault protection is multi-layered: CSP–CSN differential sensing enables 50mV current limiting; PLIM pin sources current proportional to MOSFET power dissipation (KPLIM = 200µA/V²), triggering foldback when PLIM exceeds 1.0V; thermal shutdown activates at +140°C with 20°C hysteresis, pulling SS/EN low to discharge output via 10Ω internal FET.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range (VIN) | 1.0V to 5.5V - Enables use of lowest system supply (e.g., 1.8V buck output) as power source, minimizing MOSFET dropout loss. |
| Feedback Reference Voltage | 0.5V - Sets precise output voltage via resistive divider: VOUT = 0.5V × (1 + R1/R2); supports 0.5V–1.5V adjustable range. |
| Current-Limit Threshold | 45mV to 57mV - Defines peak output current as IOUT = (VCSP − VCSN)/RSENSE; typical 50mV enables accurate 5A delivery with 10mΩ sense resistor. |
| Power-Limit Threshold | 0.90V to 1.10V - Triggers current foldback when PLIM voltage exceeds threshold, protecting external MOSFET during short-circuit or high-dV/dt events. |
| PGOOD Startup Delay | 0.5ms to 5.5ms - Ensures stable regulation before signaling system readiness; open-drain output requires external pullup to VCC. |
| Soft-Start Charge Current | 4µA to 6µA - Controls ramp rate of current limit during startup via CSS capacitor; full enable occurs when SS/EN > 2V. |
| Thermal Shutdown Threshold | +140°C - Halts operation and discharges output to prevent junction damage; auto-recovery after 20°C cooldown. |
Pinout & Package
The MAX8704EUB+ is housed in a 10-pin µMAX® package (3mm × 3mm, 0.8mm height), optimized for high-density notebook PCB layouts with exposed pad for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input sense | Senses drain voltage of external MOSFET; determines power path voltage drop and enables low-VIN operation down to 1.0V. |
| VCC | Bias supply input | Powers internal logic and DRV gate driver; must be stable 5V ±0.5V; bypassed with ≥1µF ceramic capacitor near pin. |
| PGOOD | Open-drain status output | Signals regulation status with 3ms delay; pulled low during soft-start, shutdown, or >8% output deviation; requires external pullup. |
| PLIM | Power-limit monitor output | Sources current proportional to MOSFET power dissipation; external RPLIM sets max power limit; CPLIM filters transients. |
| SS/EN | Soft-start and enable input | Capacitor-connected node controlling current-limit ramp; pulled low internally during fault conditions to force shutdown and output discharge. |
| FB | Feedback input | Selects operating mode: tied to VCC → 1.5V fixed; tied to GND → 1.2V fixed; connected to divider → adjustable (0.5V reference). |
| CSN | Negative current-sense input | Connects to MOSFET source terminal; forms differential pair with CSP to measure sense-resistor voltage for current limiting. |
| CSP | Positive current-sense input | Connects to MOSFET drain-side of sense resistor; high-impedance input ensures accurate 50mV threshold detection. |
| GND | Analog and power ground | Common reference for all analog circuitry; must be connected to low-impedance ground plane to minimize noise and improve thermal performance. |
| DRV | MOSFET gate driver output | Drives external n-channel MOSFET gate with VCC − 1.0V high-level swing and 1.0V low-level swing; slew rate 0.2V/µs into 40nF. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Mode Feedback | Supports 1.2V or 1.5V fixed output without external components (FB = GND or VCC), or 0.5V–1.5V adjustable output via resistive divider - simplifies BOM and layout for multiple CPU voltage rails. |
| Programmable Power Limit | PLIM pin enables MOSFET power dissipation control via external RPLIM/CPLIM network - allows safe indefinite short-circuit operation without thermal runaway. |
| Integrated Output Discharge | 10Ω internal FET pulls output to GND during shutdown (SS/EN low) - prevents floating voltage on powered-down CPU cores and meets sequencing requirements. |
| 5V-Biased Gate Drive | VCC-powered DRV delivers robust gate drive independent of VIN - maintains strong MOSFET turn-on even with sub-1.5V input supplies, improving efficiency and stability. |
| Thermal Fault Auto-Recovery | Shuts down at +140°C and restarts automatically after 20°C cooldown - eliminates need for external reset circuitry in thermally constrained notebook chassis. |
Applications
| VMCH Supply for Intel Chipsets | VCCP Core Voltage Regulation |
|---|---|
Use Scenario: Powers memory controller hub (MCH) in Intel 9xx-series chipsets requiring tightly regulated 1.5V ±3% at up to 5A. IC Role / Device Role / Timing Role: Linear regulator controller managing external MOSFET to deliver low-noise, fast-transient VMCH rail with PGOOD coordination to chipset reset logic. Use Value: Achieves <25mV load transient undershoot with 2×22µF ceramic output capacitance, meeting Intel VRD11.0 specification for memory subsystem stability. | Use Scenario: Generates VCCP core voltage for Pentium M and Core Duo processors in ultra-thin notebooks with strict thermal envelope limits. IC Role / Device Role / Timing Role: High-efficiency linear controller using 5V bias supply to drive low-RDS(ON) MOSFET, enabling 1.2V/1.5V selectable output with thermal foldback. Use Value: Delivers 5A at 1.2V with <1.0W MOSFET dissipation (VIN = 1.8V), reducing heatsink mass by 40% versus traditional LDO solutions. |
| Notebook CPU Core Rail | Low-Voltage Bias Supply |
Use Scenario: Supplies CPU core voltage in 12.1" and 13.3" notebooks where space constraints prohibit multi-phase buck converters. IC Role / Device Role / Timing Role: External-MOSFET linear regulator providing single-rail 0.5V–1.5V output with programmable soft-start to meet Intel IMVP-6 sequencing timing. Use Value: Soft-start capacitor (10nF) achieves controlled 5A ramp in 3ms, eliminating inrush current spikes that would trip system power monitors. | Use Scenario: Generates clean 0.5V bias for analog front-end circuits in mobile graphics subsystems requiring ultra-low noise. IC Role / Device Role / Timing Role: Adjustable-output linear controller delivering 0.5V from 1.0V input with ±0.5% initial accuracy and <0.01% line regulation. Use Value: 0.5V reference accuracy and <−60dB PSRR at 100kHz enable direct powering of precision ADC references without additional filtering. |
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 architecture but includes VID interface for dynamic voltage scaling; lacks fixed 1.2V/1.5V modes. | Required for processors supporting VID-based DVFS (e.g., Core 2 Duo); not suitable for static-VDD designs. | Select MAX8705EUB+ only when VID control and programmable output stepping are needed; MAX8704EUB+ is preferred for cost-sensitive fixed-voltage rails. |
| TPS51116RGER | Integrated MOSFET synchronous buck controller (no external FET required); higher efficiency but larger solution size and no 0.5V capability. | Used in higher-power notebooks (>10A) where efficiency >85% is mandatory; incompatible with ultra-low-VIN (1.0V) inputs. | Choose TPS51116RGER for >8A applications with 3.3V+ input; MAX8704EUB+ remains optimal for 1.0V–1.8V input, 5A, space-constrained VMCH/VCCP rails. |
Compared with MAX8705EUB+, the MAX8704EUB+ offers simpler fixed-voltage configuration and lower BOM count; versus TPS51116RGER, it provides superior low-input-voltage operation and smaller footprint but trades off conversion efficiency for design simplicity and transient response.
Availability
The MAX8704EUB+ is available at Aetrix Electronics and suitable for notebook computer VMCH supplies, CPU core voltage regulation, and low-voltage bias generation requiring stable component supply, long-term lifecycle support, and traceable sourcing for OEM production.
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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for computing, communications, and consumer electronics.
The MAX8704EUB+ belongs to Maxim's notebook power-management product line, designed specifically to replace discrete linear regulators in CPU core and chipset supply rails where low-noise, fast transient response, and compact layout are critical.
FAQ
What is the minimum input voltage supported by the MAX8704EUB+?
The MAX8704EUB+ supports a minimum input voltage (VIN) of 1.0V, enabling operation directly from low-voltage system rails such as 1.2V or 1.5V intermediate supplies. This capability is achieved by separating the power path (VIN) from the 5V bias supply (VCC) used for gate drive and control circuitry, allowing the device to maintain regulation even with minimal VIN–VOUT differential.
How does the MAX8704EUB+ protect the external MOSFET from thermal damage?
The MAX8704EUB+ protects the external MOSFET through three coordinated mechanisms: (1) current limiting at 50mV across the sense resistor, (2) programmable power limiting via the PLIM pin (foldback triggered at 1.0V), and (3) remote thermal monitoring that pulls SS/EN low when die temperature exceeds +140°C. These functions act simultaneously to prevent MOSFET overheating under overload, short-circuit, or high ambient conditions.
Can the MAX8704EUB+ generate a 0.5V output voltage?
Yes, the MAX8704EUB+ can generate a 0.5V output by connecting the FB pin to CSN, which selects the internal 0.5V reference. This mode is explicitly specified in the Electrical Characteristics table and enables ultra-low-voltage biasing for analog circuits or next-generation CPU cores requiring sub-1.0V supplies.
What is the purpose of the SS/EN pin on the MAX8704EUB+?
The SS/EN pin on the MAX8704EUB+ serves dual functions: it enables soft-start control via an external capacitor (ramping current limit from zero to full value) and acts as a shutdown input. When pulled low-by an external signal or internal fault-the MAX8704EUB+ disables DRV, asserts PGOOD low, and discharges the output through a 10Ω internal FET, ensuring safe power-down sequencing.
Does the MAX8704EUB+ require external components for basic operation?
Yes, the MAX8704EUB+ requires several external components for basic operation: an external n-channel MOSFET, current-sense resistor (RSENSE), soft-start capacitor (CSS), power-limit resistor/capacitor (RPLIM/CPLIM), input/output capacitors (CIN/COUT), and feedback resistors (if adjustable output is used). The 1.2V/1.5V fixed modes eliminate the need for feedback resistors but still require all other elements for regulation and protection.
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:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Adjustable (Fixed)
- 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):
- 10 µA
- Current - Supply (Max):
- 3 mA
- PSRR:
- -
- Control Features:
- Enable, Power Good, Power Limit, Soft Start
- Protection Features:
- Over Temperature, Under Voltage Lockout (UVLO)
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-uMAX/uSOP
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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