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Analog Devices Inc./Maxim Integrated MAX1951AESA+
- Part No.:
- MAX1951AESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1951AESA+.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:116
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Product details
Overview
The MAX1951AESA+ from Maxim Integrated is a high-efficiency, synchronous PWM DC-DC step-down regulator delivering up to 2A output current with ±1.5% total output error over load, line, and temperature (-40°C to +85°C); operates from 2.6V–5.5V input and supports adjustable 0.8V–VIN output voltage; ideal for postregulation in FPGA core/I/O power supplies.
For engineers reviewing the MAX1951AESA+ datasheet, MAX1951AESA+ pinout, MAX1951AESA+ application, or MAX1951AESA+ equivalent, key selection criteria include guaranteed 2A output capability, 1MHz fixed-frequency operation enabling compact 2µH inductor/10µF ceramic capacitor designs, internal soft-start and prebiased startup support, and thermal/short-circuit protection for robust embedded power delivery.
Technical Context
The MAX1951AESA+ employs current-mode PWM control with integrated high-side PMOS and low-side NMOS synchronous rectifiers, eliminating external Schottky diodes. Its transconductance error amplifier (gm = 4.2S) and slope-compensated comparator regulate peak inductor current based on feedback voltage error and sensed RDS(ON)-based current.
It features digital soft-start, zero-crossing detection for safe prebiased startup, undervoltage lockout (2.07V/2.19V thresholds), and thermal shutdown at 165°C with 9°C hysteresis. The device enters pulse-skip mode under short-circuit conditions, limiting current to 3A (typ) while reducing power dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 2A continuous - supports demanding FPGA core and I/O rail loads without derating. |
| Input Voltage Range | 2.6V to 5.5V - compatible with single-cell Li-ion, 3.3V, and 5V intermediate bus architectures. |
| Output Voltage Range | Adjustable 0.8V to VIN - enables precise regulation for sub-1V ASIC cores and scalable I/O voltages. |
| Switching Frequency | Fixed 1MHz (±10%) - allows use of small 2µH inductors and 10µF ceramic capacitors, minimizing PCB area. |
| Output Accuracy | ±1.5% over load, line, and temperature (-40°C to +85°C) - ensures stable voltage under dynamic system conditions. |
| Efficiency | Up to 94% at 5V input / 1.5V@2A - reduces thermal load and improves power density in space-constrained designs. |
| Protection Features | Short-circuit, thermal-overload, and prebiased-safe startup - eliminates need for external fault-handling circuitry. |
Pinout & Package
MAX1951AESA+ is housed in an 8-pin SO (Small Outline) package with exposed pad for thermal enhancement, rated for -40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Internal bias supply | Bypassed with 0.1µF capacitor to GND and 10Ω resistor to IN; powers internal circuitry independently of LX switching node. |
| EN | Enable control input | Active-high logic input; drives device into <0.4mA shutdown when pulled low; initiates soft-start on rising edge. |
| GND | Signal ground reference | Reference for FB, COMP, and EN; must be separated from PGND plane to avoid noise coupling into feedback path. |
| FB | Feedback voltage sense | Monitors output via resistor divider; regulates output to 0.8V reference with ±1.5% accuracy across full operating range. |
| COMP | Error amplifier output | Connects external RC compensation network; sets loop stability for wide input/output voltage combinations. |
| PGND | Power ground return | Internally connected to GND but routed separately; carries high di/dt switching currents to minimize ground bounce. |
| LX | Switch node | Drives external inductor; integrates synchronous high-side PMOS and low-side NMOS FETs with RDS(ON) ≤266mΩ (PMOS) and ≤246mΩ (NMOS). |
| IN | Main power input | Accepts 2.6V–5.5V; bypassed with ≥10µF ceramic capacitor to PGND; feeds VCC via 10Ω resistor for clean bias supply. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated high-side PMOS and low-side NMOS eliminate external Schottky diode, improving efficiency by ~5–8% vs. asynchronous designs. |
| Prebiased output startup | Digital zero-crossing detection enables safe start-up into existing output voltage - essential for tracking supplies in multi-rail systems. |
| Current-sense via RDS(ON) | Eliminates external current-sense resistor, reducing BOM count, board space, and power loss in high-current paths. |
| 1MHz fixed-frequency PWM | Enables use of miniature 2µH shielded inductors and low-ESR 10µF X5R ceramics - achieves <0.385in² total solution footprint. |
| Thermal and short-circuit protection | Auto-recovering thermal shutdown (165°C trip) and pulse-skip mode during short-circuit prevent latch-up and enable field reliability. |
Applications
| ASIC/DSP Core Power | FPGA I/O Rail Regulation |
|---|---|
|
Use Scenario: Providing tightly regulated 1.0V–1.2V core voltage to high-performance ASICs or DSPs with fast transient load steps. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering up to 2A with ±1.5% accuracy and <100µs transient response. Use Value: Maintains core voltage within specification during 1A–2A load transients, preventing timing violations or logic errors in deep-submicron devices. |
Use Scenario: Generating configurable 1.5V–3.3V I/O supply for FPGA banks supporting multiple interface standards (LVCMOS, SSTL, HSTL). IC Role / Device Role / Timing Role: Adjustable post-regulator with independent enable control per rail, supporting power sequencing requirements. Use Value: Enables flexible I/O voltage assignment without redesign; prebiased startup avoids bus contention during hot-plug or partial reconfiguration. |
| Networking Line Card Power | Set-Top Box SoC Supply |
|
Use Scenario: Local 2A power conversion on dense telecom line cards where space and thermal management are critical. IC Role / Device Role / Timing Role: Compact, thermally robust DC-DC converter operating from 3.3V or 5V backplane with minimal external components. Use Value: Achieves >92% efficiency at full load with 8-pin SO package, reducing heatsink requirements and enabling higher port density. |
Use Scenario: Powering multimedia SoCs in consumer set-top boxes requiring low-noise, cost-effective 1.2V/1.8V/3.3V rails. IC Role / Device Role / Timing Role: Single-chip synchronous buck solution with integrated MOSFETs and soft-start, simplifying compliance with energy-efficiency standards. Use Value: Reduces bill-of-materials by eliminating discrete MOSFETs and Schottky diodes while meeting standby current <0.4mA in shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC-DC step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 3MHz switching frequency, 0.6V–5.5V input, 0.6V–5.5V output, 0.6A max; smaller 6-pin WSON package. | Lower current rating and higher frequency limit suitability to ultra-compact, low-power applications only. | Select when board space is constrained and load current ≤600mA; not suitable for 2A FPGA core replacement. |
| RT8059NGSP | 2A synchronous buck, 2.5V–5.5V input, 0.6V–5.5V output, 1.5MHz switching, ±2% output accuracy, no prebias support. | Lacks safe startup into prebiased outputs and has looser output tolerance - limits use in tracking or redundant supply designs. | Consider for cost-sensitive, non-tracking applications where ±2% accuracy is acceptable and thermal margin exceeds 15°C. |
Compared with TPS62231DRYR and RT8059NGSP, the MAX1951AESA+ uniquely combines guaranteed 2A output, ±1.5% accuracy, prebiased startup, and 1MHz operation in an industry-standard SO-8 package - making it the only option among the three qualified for FPGA core and multi-rail tracking applications requiring robustness and precision.
Availability
MAX1951AESA+ is available at Aetrix Electronics and suitable for FPGA power delivery, ASIC core regulation, and networking line card designs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX1951AESA+ 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.
The MAX1951AESA+ belongs to Maxim's high-efficiency synchronous buck regulator product line, designed specifically for space-constrained, high-current postregulation in FPGA, ASIC, and SoC applications demanding precision, reliability, and simplified layout.
FAQ
What is the maximum guaranteed output current for the MAX1951AESA+?
The MAX1951AESA+ guarantees 2A of continuous output current across its full operating temperature range (-40°C to +85°C) and input voltage range (2.6V to 5.5V), as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. This rating accounts for internal MOSFET RDS(ON), thermal limits, and synchronous rectifier performance - no external current-sense resistor is required to achieve this specification.
Does the MAX1951AESA+ support startup into a prebiased output voltage?
Yes, the MAX1951AESA+ includes dedicated zero-crossing detection (ZCD) circuitry that enables safe startup into a prebiased output. When EN is asserted, the device monitors the FB pin and delays switching until the soft-start ramp reaches the existing output voltage level; if the prebias exceeds the target, the low-side FET discharges the output to the setpoint. This behavior is explicitly verified in the Typical Operating Characteristics (Figures toc10–toc11).
What package type and thermal characteristics does the MAX1951AESA+ have?
The MAX1951AESA+ is supplied in an 8-pin SO (Small Outline) package with lead(Pb)-free/RoHS-compliant finish. It features a junction-to-case thermal resistance (θJC) of 32°C/W and a continuous power dissipation rating of 976mW at +70°C ambient, derating 12.2mW/°C above that temperature. The exposed pad variant enhances thermal performance in standard PCB layouts.
Can the MAX1951AESA+ operate with ceramic input and output capacitors only?
Yes, the MAX1951AESA+ is fully optimized for ceramic capacitors: the datasheet specifies 10µF ceramic input and output capacitors plus a 2µH inductor for 2A operation. Its current-mode control architecture and internal compensation are tuned for low-ESR/low-ESL ceramics, eliminating the need for bulk electrolytic or tantalum capacitors in most designs.
What is the switching frequency tolerance and how does it vary with input voltage?
The MAX1951AESA+ operates at a nominal 1MHz switching frequency with ±10% variation (0.9–1.1MHz) across the 2.6V–5.5V input range, as specified in the Electrical Characteristics table. Figure toc03 confirms frequency remains stable between 925kHz and 1050kHz - critical for predictable EMI filtering and consistent inductor sizing in production designs using the MAX1951AESA+.
MAX1951AESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.6V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 2A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX1951AESA+ FAQ
1.How can I place an order for MAX1951AESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1951AESA+ 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 MAX1951AESA+ reliable?
The price and inventory of MAX1951AESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1951AESA+ is usually 5 days.
3.What payment methods are accepted for MAX1951AESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1951AESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1951AESA+?
MAX1951AESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1951AESA+ 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 MAX1951AESA+?
For technical support, including MAX1951AESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1951AESA+ requirements.
6.How does Aetrix verify that MAX1951AESA+ is sourced from the original manufacturer or authorized distributors?
All MAX1951AESA+ 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 MAX1951AESA+ meets industry standards.
7.What is the process for return or replacement of MAX1951AESA+?
All MAX1951AESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1951AESA+, 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 MAX1951AESA+ part is unused and in its original packaging.
Return procedure for MAX1951AESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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