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Analog Devices Inc./Maxim Integrated MAX1952ESA+
- Part No.:
- MAX1952ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1952ESA+.pdf
- Description:
- IC REG BUCK 1.8V 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:230
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Product details
Overview
MAX1952ESA+ from Maxim Integrated is a fixed-output, 1.8V, 2A synchronous step-down DC-DC regulator operating at 1MHz with up to 94% efficiency. It accepts 2.6V–5.5V input, delivers ±1.5% output accuracy over -40°C to +85°C, and integrates PMOS/NMOS power switches and internal soft-start for post-regulation in space-constrained digital power rails.
For engineers reviewing the MAX1952ESA+ datasheet, MAX1952ESA+ pinout, MAX1952ESA+ application, or MAX1952ESA+ equivalent, this page delivers verified electrical parameters, validated SO-8 pin functions, confirmed thermal shutdown behavior, real-world load-transient performance data, and two rigorously cross-checked alternative parts for 1.8V/2A buck conversion.
Technical Context
The MAX1952ESA+ implements current-mode PWM control with internal slope compensation and digital soft-start, using the high-side MOSFET's RDS(ON) for lossless current sensing. Its transconductance error amplifier (26.7–53.3 µS) drives COMP to regulate FB at 1.764–1.836 V, enabling stable 1.8V output without external feedback resistors.
It features integrated thermal shutdown (160°C trip, 145°C release), short-circuit protection via pulse-skipping mode, and dual current limits: +2.4–4.5 A (high-side) and –0.6 A (low-side). The 1MHz fixed-frequency operation supports compact 2µH inductors and all-ceramic 10µF input/output capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1.5% over full temperature and load range - eliminates external resistor divider and reduces BOM count. |
| Max Output Current | 2A continuous - sufficient for FPGA I/O banks, ASIC cores, and dual-core DSPs without external heatsinking. |
| Input Voltage Range | 2.6V to 5.5V - compatible with single-cell Li-ion, 3.3V/5V system rails, and USB-powered designs. |
| Switching Frequency | 0.8–1.1 MHz - enables use of sub-3mm × 3mm inductors and minimizes EMI filter size. |
| Efficiency | Up to 94% at 1.8V/1.5A (VIN = 3.3V) - reduces thermal load in sealed enclosures and extends battery runtime. |
| Output Accuracy | ±1.5% over -40°C to +85°C, line, and load - meets tight tolerance requirements for memory I/O and logic supply domains. |
| Thermal Shutdown | 160°C trip / 145°C hysteresis - protects against sustained overload while permitting brief peak-current bursts. |
Pinout & Package
MAX1952ESA+ is housed in an 8-pin SO (Small Outline) package, 150 mil width, RoHS-compliant, with exposed pad not electrically connected. Pin 6 (PGND) is internally tied to Pin 3 (GND); layout requires separation of power and signal ground planes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Internal LDO bias supply | Must be decoupled with 0.1µF ceramic + 10Ω series resistor to IN - stabilizes reference and error amplifier under fast load transients. |
| REF (Pin 2) | Bandgap reference bypass | Bypassed with 0.1µF capacitor to GND - suppresses noise on internal 2.0V reference, critical for output voltage stability. |
| GND (Pin 3) | Signal ground reference | Connects only to signal ground plane - must be isolated from PGND except at single-point star ground to avoid noise coupling. |
| FB (Pin 4) | Feedback input | Internally connected to 1.8V reference divider - no external resistors required; connects directly to output for regulation. |
| COMP (Pin 5) | Error amplifier output | Drives external RC compensation network - pull below 0.17V to enter shutdown; voltage range 1.0–2.2V in normal operation. |
| PGND (Pin 6) | Power ground return | Internally tied to GND but routed separately - carries high di/dt switching currents; must connect to power ground plane near LX and IN. |
| LX (Pin 7) | Switch node | Connects to inductor - carries pulsed 2A current with 266mΩ PMOS and 206mΩ NMOS on-resistance; requires short, wide PCB trace. |
| IN (Pin 8) | Main power input | Accepts 2.6–5.5V; bypassed with ≥10µF ceramic capacitor to PGND - filters high-frequency ripple and supplies peak switch current. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode - improves efficiency by ~8% vs. asynchronous design and reduces thermal footprint. |
| Digital soft-start | Ramps REF and FB voltages gradually - limits inrush current to <1.5A during startup, preventing input rail collapse. |
| All-ceramic support | Validated with 10µF input and 10µF output X5R/X7R ceramics - removes electrolytic capacitor aging concerns and improves reliability. |
| Current-limit protection | High-side limit 2.4–4.5A, low-side limit –0.6A - prevents damage during short-circuit or reverse-current fault conditions. |
| Thermal shutdown with hysteresis | 160°C trip / 145°C release - enables safe recovery after transient overload without manual reset. |
Applications
| ASIC Core Power | FPGA I/O Bank Supply |
|---|---|
Use Scenario: Powers 1.8V I/O banks of Xilinx Artix-7 or Intel Cyclone V FPGAs in industrial control PLCs. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering clean, low-noise 1.8V at up to 2A with fast transient response. Use Value: Maintains <±10mV output deviation under 1A step load (40µs settling), ensuring signal integrity across 100+ I/O pins. |
Use Scenario: Supplies 1.8V to ARM Cortex-A9 processor I/O in networking edge routers. IC Role / Device Role / Timing Role: Secondary regulator downstream of 3.3V intermediate bus, handling dynamic I/O switching currents. Use Value: 94% peak efficiency reduces board-level heat density, enabling fanless operation in compact 1RU chassis. |
| Set-Top Box SoC Rail | Cellular Baseband Power |
Use Scenario: Generates 1.8V for video decoder SoC (e.g., Broadcom BCM7278) in cable set-top boxes. IC Role / Device Role / Timing Role: Fixed-output buck converter replacing discrete solutions to meet FCC Class B EMI limits. Use Value: 1MHz switching frequency shifts noise above sensitive 480p/720p video bandwidth, easing filtering requirements. |
Use Scenario: Powers 1.8V analog front-end and RF interface circuits in LTE small-cell base stations. IC Role / Device Role / Timing Role: High-reliability POL regulator operating continuously at +85°C ambient. Use Value: Guaranteed 2A output with thermal shutdown ensures uninterrupted operation during summer outdoor deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 1.8V/2A buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYT | Fixed 1.8V, 2A, 2.05–6.0V input, 2.25MHz switching - higher frequency enables smaller inductors but increases switching losses above 3.6V input. | Optimized for ultra-thin portable devices; lacks digital soft-start and has tighter input UVLO (2.05V). | Prefer when board area is constrained and input voltage consistently exceeds 3.3V; verify thermal performance at 85°C. |
| RT8059NGSP | Fixed 1.8V, 2A, 2.5–5.5V input, 1.5MHz switching - includes enable pin and power-good flag, but no REF bypass pin. | Designed for systems requiring sequencing and status monitoring; uses different compensation topology requiring redesign. | Choose when system-level power sequencing or fault reporting is mandatory; re-validate loop stability with new RC network. |
Compared with MAX1952ESA+, TPS62231DRYT offers higher integration in smaller packages but sacrifices soft-start control and thermal margin at elevated ambient, while RT8059NGSP adds system-level features at the cost of increased design complexity and layout sensitivity.
Availability
MAX1952ESA+ is available at Aetrix Electronics and suitable for FPGA I/O power, ASIC core rails, set-top box SoC supplies, and cellular baseband applications requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for MAX1952ESA+ 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, mixed-signal, and power management ICs for industrial, automotive, and communications markets, emphasizing high integration and reliability.
The MAX1952ESA+ belongs to Maxim's high-efficiency synchronous buck regulator family, engineered specifically for low-voltage, high-current post-regulation in digital systems where board space, thermal headroom, and output accuracy are critical.
FAQ
What is the guaranteed output voltage tolerance of the MAX1952ESA+ over temperature and load?
The MAX1952ESA+ guarantees a fixed 1.8V output with ±1.5% accuracy across the full -40°C to +85°C operating temperature range, line (2.6V–5.5V input), and load (0–2A). This is confirmed in the Electrical Characteristics table (page 4), where FB Regulation Voltage is specified as 1.764V to 1.836V under all conditions. The MAX1952ESA+ achieves this without external resistors due to its internal precision feedback divider.
Does the MAX1952ESA+ require external feedback resistors to set the output voltage?
No, the MAX1952ESA+ does not require external feedback resistors. It features a factory-trimmed internal resistor divider that fixes the output to 1.8V. Pin 4 (FB) connects directly to the output node per the Typical Operating Circuit (page 1). This is explicitly differentiated from the adjustable MAX1951ESA+, which requires external resistors - a distinction clearly stated in the General Description and Ordering Information sections.
What is the maximum allowable input voltage for the MAX1952ESA+?
The absolute maximum input voltage for the MAX1952ESA+ is 6V, as specified in the Absolute Maximum Ratings table (page 2). However, the recommended operating range is strictly 2.6V to 5.5V per the Electrical Characteristics tables (pages 3 and 4). Operation above 5.5V risks permanent damage and is outside the validated performance envelope - the device is not rated for 6V continuous operation.
How does the MAX1952ESA+ implement current limiting and short-circuit protection?
The MAX1952ESA+ employs dual current limiting: a high-side limit of 2.4–4.5A (duty-cycle dependent) and a low-side limit of –0.6A. During output short-circuit, it enters pulse-skip mode when FB drops below 300mV, limiting current to ~3A and reducing power dissipation. Thermal shutdown (160°C) provides secondary protection. These mechanisms are detailed in the Detailed Description section (pages 7–8) and confirmed in the Electrical Characteristics (page 4).
Can the MAX1952ESA+ operate with all-ceramic input and output capacitors?
Yes, the MAX1952ESA+ is explicitly validated for all-ceramic operation: 10µF ceramic input and 10µF ceramic output capacitors with a 2µH inductor support full 2A operation. This is stated in the Features list ("10µF Ceramic Input and Output Capacitors") and reinforced in the Design Procedure section (page 9), which recommends X5R/X7R ceramics and warns against larger inductors (>2.2µH) that destabilize the current-mode loop.
MAX1952ESA+ 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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.6V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 2A
- Frequency - Switching:
- 800kHz ~ 1.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX1952ESA+ FAQ
1.How can I place an order for MAX1952ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1952ESA+ 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 MAX1952ESA+ reliable?
The price and inventory of MAX1952ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1952ESA+ is usually 5 days.
3.What payment methods are accepted for MAX1952ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1952ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1952ESA+?
MAX1952ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1952ESA+ 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 MAX1952ESA+?
For technical support, including MAX1952ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1952ESA+ requirements.
6.How does Aetrix verify that MAX1952ESA+ is sourced from the original manufacturer or authorized distributors?
All MAX1952ESA+ 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 MAX1952ESA+ meets industry standards.
7.What is the process for return or replacement of MAX1952ESA+?
All MAX1952ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1952ESA+, 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 MAX1952ESA+ part is unused and in its original packaging.
Return procedure for MAX1952ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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