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Analog Devices Inc./Maxim Integrated MAX767SEAP
- Part No.:
- MAX767SEAP
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Power Supply Controllers, Monitors
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX767SEAP.pdf
- Description:
- STEP-DOWN POWER CONTROLLER
- Quantity:
- Payment:
- Shipping:
Inventory:474
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Product details
Overview
MAX767SEAP from Maxim Integrated is a monolithic BiCMOS synchronous buck controller IC designed to convert a 4.5V–5.5V input into a tightly regulated 3.3V output at up to 10A, featuring 300kHz switching frequency, all-N-channel MOSFET support, >90% efficiency at full load, and integrated 3.3V reference. It serves as the core PWM control unit in compact, high-density DC-DC power supplies for microprocessor daughterboards and embedded systems.
For engineers reviewing the MAX767SEAP datasheet, MAX767SEAP pinout, MAX767SEAP application, or MAX767SEAP equivalent, key selection considerations include its fixed 3.3V output, SSOP-20 package compatibility, current-mode control architecture, soft-start programmability, and absence of external compensation requirements - all critical for low-noise, space-constrained 5V-to-3.3V conversion.
Technical Context
The MAX767SEAP implements a direct-summing current-mode PWM architecture with no integrator-based error amplifier, eliminating need for external loop compensation when ESR guidelines are followed. Its oscillator supports 200kHz (GND/VCC sync) or 300kHz (REF sync) operation, with internal slope compensation and cycle-by-cycle current limiting triggered at 100mV across CS–FB.
It integrates a 3.3V ±1.2% bandgap reference (REF) capable of sourcing 5mA, active even in shutdown; gate drivers DH and DL provide break-before-make timing to prevent shoot-through, while BST–LX boost circuit enables high-side N-MOSFET drive without external charge pump.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 300kHz (REF-sync), 200kHz (GND/VCC-sync); enables smaller L/C components vs. lower-frequency alternatives |
| Output Voltage | Fixed 3.3V ±1.2% (T = 0°C to +70°C); precision regulation for Pentium P54C VR-spec compliance |
| Input Voltage Range | 4.5V to 5.5V; matches standard 5V rail tolerances and eliminates need for pre-regulation |
| Efficiency | >90% at 5A load; achieved via synchronous rectification and all-N-channel topology, removing heatsink requirement |
| Quiescent Current | 700µA (active), 120µA (standby); minimizes no-load power loss in always-on subsystems |
| Current Limit Threshold | 100mV (CS–FB); sets overcurrent protection point independent of temperature or supply variation |
| Reference Output | 3.3V ±1.2%, 5mA sink/source; usable for auxiliary biasing or memory keep-alive without external regulator |
Pinout & Package
MAX767SEAP is housed in a 20-pin Shrink Small-Outline Package (SSOP) with exposed thermal pad (PGND-connected), optimized for high-power density and thermal performance in surface-mount applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Current-sense input | Monitors voltage drop across external sense resistor; triggers shutdown if ≥100mV |
| 2 (SS) | Soft-start control | Accepts external capacitor to linearly ramp current limit and suppress inrush during startup |
| 3 (ON) | Enable/disable input | Active-high logic; tie to VCC for automatic start-up; pulls low to discharge SS capacitor |
| 4–7, 11 (GND) | Analog ground | Low-current reference node for FB, REF, and internal comparators; separate from PGND |
| 8 (REF) | Internal reference output | Stable 3.3V ±1.2% source; requires ≥0.22µF bypass to GND for stability |
| 9 (SYNC) | Oscillator synchronization | Selects 200kHz (GND/VCC) or 300kHz (REF); accepts external 240–350kHz TTL/CMOS clock |
| 10, 14, 15 (VCC) | Supply input | Power pin for internal circuitry; must be decoupled locally; 4.5V–5.5V operating range |
| 17 (BST) | Bootstrap capacitor connection | Connects 0.1µF capacitor to generate gate drive voltage >VIN for high-side N-MOSFET |
| 12 (N.C.) | No internal connection | Unbonded pin; must remain unconnected and unpopulated on PCB |
| 13 (PGND) | Power ground | High-current return path for LX, DH, DL, and external MOSFETs; connects to thermal pad |
| 18 (LX) | Switch node | Connects to inductor and high/low-side MOSFET drains; swings 2V below GND without latchup |
| 19 (DH) | High-side gate driver | Drives gate of external N-channel high-side switch; referenced to LX, not GND |
| 20 (FB) | Feedback input | Compares output voltage against internal 3.3V reference; also used with CS for current sensing |
Key Features
| Feature | Design Value |
|---|---|
| Direct-summing PWM architecture | Eliminates external compensation components by integrating slope compensation and avoiding integrator phase lag |
| Idle-Mode™ light-load operation | Reduces switching frequency dynamically below ~25% load, cutting switching losses while maintaining regulation |
| All-N-channel MOSFET support | Lowers BOM cost and improves efficiency vs. P-channel high-side solutions; enabled by integrated BST boost circuit |
| Integrated 3.3V reference (REF) | Provides stable, loadable 5mA bias source active in shutdown - usable for system-level keep-alive functions |
| Kelvin-sense compatible current monitoring | CS/FB inputs support remote-sense layout to reject PCB trace resistance errors in high-current paths |
Applications
| Microprocessor Daughterboards | Local 5V-to-3.3V DC-DC Conversion |
|---|---|
Use Scenario: Powering Intel Pentium P54C or compatible CPUs on add-in cards where board space and thermal envelope are constrained. IC Role / Device Role / Timing Role: Primary synchronous buck controller generating VR-spec-compliant 3.3V supply with tight transient response. Use Value: Delivers >90% efficiency at 5A without heatsink, enabling dense stacking of daughterboards in rack-mounted systems. |
Use Scenario: Point-of-load regulation on mainboards or peripheral modules requiring clean, low-noise 3.3V from shared 5V rail. IC Role / Device Role / Timing Role: Fixed-output step-down controller managing inductor current, soft-start, and fault protection autonomously. Use Value: 300kHz operation allows use of 3.3µH inductor - five times smaller than competing 200kHz designs - reducing footprint by >40%. |
| High-Density Embedded Power Supplies | Industrial Control I/O Modules |
Use Scenario: Compact 10A power stage in programmable logic controllers (PLCs) where PCB real estate and convection cooling dominate design constraints. IC Role / Device Role / Timing Role: Core PWM controller coordinating dual N-MOSFET switches, synchronous rectification, and current-limit protection. Use Value: All-N-channel topology and SSOP-20 package enable full 10A capability in <1.5 cm² area, meeting IPC-2221 Class 2 spacing rules. |
Use Scenario: Reliable 3.3V supply for FPGA configuration, ADC reference, and isolated communication interfaces in harsh industrial environments. IC Role / Device Role / Timing Role: Regulator with robust fault handling (UVLO, current limit, short-circuit tolerance) and wide-temp operation (0°C to +70°C). Use Value: 120µA standby current and active REF output allow maintenance of configuration memory during brownout events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX765SEAP | Fixed 3.3V output, but uses external compensation and lacks REF output; 200kHz only; no Idle-Mode | Suitable for cost-sensitive, lower-performance 3A–5A designs where board space is less constrained | Choose MAX767SEAP when 300kHz operation, integrated REF, or light-load efficiency are required |
| TPS5430DDAR | Adjustable output (0.8V–5.5V), 3.5A integrated FETs, 500kHz max; no BST boost or REF output | Used in flexible-output, medium-current applications where external inductor is acceptable but integrated FETs preferred | Choose MAX767SEAP when fixed 3.3V, >5A capability, or auxiliary 3.3V biasing is needed |
Compared with MAX765SEAP and TPS5430DDAR, the MAX767SEAP uniquely combines fixed 3.3V regulation, 300kHz operation, integrated 3.3V reference, and Idle-Mode™ - making it optimal for space-limited, high-efficiency 5V-to-3.3V conversion in microprocessor and industrial embedded systems.
Availability
MAX767SEAP is available at Aetrix Electronics and suitable for microprocessor daughterboards, local 5V-to-3.3V DC-DC conversion, and industrial control I/O modules requiring stable component supply across production lifecycles.
Supply support for MAX767SEAP 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 fabless semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, computing, and communications markets.
The MAX767SEAP belongs to Maxim's high-efficiency synchronous buck controller product line, engineered specifically for compact, high-current 5V-to-3.3V conversion in space- and thermally constrained embedded systems.
FAQ
What is the operating temperature range for the MAX767SEAP?
The MAX767SEAP is specified for 0°C to +70°C ambient operation. This commercial-grade temperature range aligns with its target applications in microprocessor daughterboards and non-extended-temperature industrial modules. The device incorporates thermal shutdown protection and maintains output regulation across this full range without derating. For extended-temperature variants, the MAX767EAP (-40°C to +85°C) is available - but the MAX767SEAP itself is rated strictly for 0°C to +70°C.
Does the MAX767SEAP require external compensation components?
No, the MAX767SEAP does not require external compensation components due to its direct-summing current-mode PWM architecture with built-in slope compensation. As long as the output capacitor's ESR falls within the recommended range (typically 5–30mΩ for 5A designs), the control loop remains stable without additional RC networks. This simplifies layout and reduces BOM count - a key advantage confirmed in the "Detailed Description" section of the official datasheet for MAX767SEAP.
Can the MAX767SEAP be synchronized to an external clock?
Yes, the MAX767SEAP supports external clock synchronization via the SYNC pin. When driven with a CMOS/TTL signal between 240kHz and 350kHz, each high-to-low transition initiates a new oscillator cycle. This feature enables precise timing alignment across multiple MAX767SEAP units or with system clocks - critical for noise-sensitive applications like high-speed data acquisition. Internal frequencies (200kHz/300kHz) are selected by tying SYNC to GND/VCC or REF respectively.
What is the purpose of the REF pin on the MAX767SEAP?
The REF pin on the MAX767SEAP provides a stable, internally generated 3.3V ±1.2% reference voltage capable of sourcing up to 5mA. It remains active even when the PWM controller is disabled (ON = low), making it suitable for auxiliary functions such as memory keep-alive biasing or powering low-current analog circuitry. The datasheet mandates a minimum 0.22µF ceramic capacitor from REF to GND for stability - a requirement explicitly defined for MAX767SEAP in the Pin Description table.
How does the MAX767SEAP achieve >90% efficiency at 5A?
The MAX767SEAP achieves >90% efficiency at 5A through three integrated design features: (1) synchronous rectification using external N-channel MOSFETs driven by DL, eliminating Schottky diode forward-drop losses; (2) all-N-channel topology enabled by the internal BST boost circuit, reducing conduction losses; and (3) 300kHz operation allowing use of low-DCR inductors and low-ESR capacitors. These features collectively minimize both switching and conduction losses - as verified in the "Typical Operating Characteristics" efficiency curves for the 5A circuit (Figure MAX767-03) in the MAX767SEAP datasheet.
MAX767SEAP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Applications:
- Power Supply Controller
- Voltage - Input:
- 4.5V ~ 5.5V
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Supply:
- 700 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
MAX767SEAP FAQ
1.How can I place an order for MAX767SEAP through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX767SEAP 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 MAX767SEAP reliable?
The price and inventory of MAX767SEAP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX767SEAP is usually 5 days.
3.What payment methods are accepted for MAX767SEAP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX767SEAP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX767SEAP?
MAX767SEAP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX767SEAP 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 MAX767SEAP?
For technical support, including MAX767SEAP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX767SEAP requirements.
6.How does Aetrix verify that MAX767SEAP is sourced from the original manufacturer or authorized distributors?
All MAX767SEAP 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 MAX767SEAP meets industry standards.
7.What is the process for return or replacement of MAX767SEAP?
All MAX767SEAP units undergo pre-shipment inspection (PSI). If there is an issue with MAX767SEAP, 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 MAX767SEAP part is unused and in its original packaging.
Return procedure for MAX767SEAP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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