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Analog Devices Inc./Maxim Integrated MAX1952ESA+T
- Part No.:
- MAX1952ESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1952ESA+T.pdf
- Description:
- IC REG BUCK 1.8V 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,504
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Product details
Overview
The MAX1952ESA+T 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 load/line/temperature, and integrates internal PMOS/NMOS power switches and soft-start for post-regulation in space-constrained systems.
For engineers reviewing the MAX1952ESA+T datasheet, MAX1952ESA+T pinout, MAX1952ESA+T application, or MAX1952ESA+T equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternatives, and supply-chain support for industrial and embedded power designs.
Technical Context
The MAX1952ESA+T implements current-mode PWM control with internal slope compensation, regulating output by sensing high-side MOSFET RDS(ON) voltage drop. Its fixed 1.8V output is set via internal feedback resistors-no external divider required-enabling stable operation with ceramic input/output capacitors and a 2µH inductor.
It features digital soft-start, thermal shutdown at +160°C (restarting at +145°C), short-circuit protection via pulse-skipping, and shutdown control via COMP pin pull-down. The device uses synchronous rectification to eliminate external Schottky diodes and achieves <1% total output error across –40°C to +85°C at ≤1.5A load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1.5% - eliminates need for external feedback resistors; ensures precise core/I/O rail compliance. |
| Max Output Current | 2A continuous - supports FPGA I/O banks, ASIC cores, and dual-rail telecom ICs without external current boosting. |
| Input Voltage Range | 2.6V to 5.5V - compatible with single-cell Li-ion, 3.3V system rails, and USB-powered applications. |
| Switching Frequency | 1MHz (0.8–1.1MHz range) - enables compact 2µH inductors and 10µF ceramic capacitors; reduces board area by >40% vs. 500kHz solutions. |
| Efficiency | Up to 94% at 3.3VIN/1.8VOUT - minimizes thermal load in sealed enclosures and extends battery runtime in portable equipment. |
| Output Accuracy | ±1.5% over –40°C to +85°C, full load - meets tight tolerance requirements for DSP, microprocessor, and FPGA core supplies. |
| Protection Features | Thermal shutdown, short-circuit pulse-skip, and internal current limiting (3.1A high-side, –0.6A low-side) - prevents catastrophic failure during fault conditions without external circuitry. |
Pinout & Package
MAX1952ESA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free, with exposed pad not present. Thermal resistance θJA = 82°C/W on standard 4-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Internal bias supply | Must be decoupled with 0.1µF capacitor to GND and 10Ω resistor to IN; powers internal logic and gate drivers independently of LX switching noise. |
| REF (Pin 2) | Reference bypass | Connects to internal 2.0V bandgap reference; requires 0.1µF ceramic cap to GND for stability and low-noise regulation. |
| GND (Pin 3) | Signal ground | Reference for FB, COMP, REF; must be separated from PGND plane to avoid noise coupling into feedback path. |
| FB (Pin 4) | Feedback input | Internally connected to fixed 1.8V divider - tie directly to output; no external resistors needed; sets regulation point with 0.773–1.836V tolerance window. |
| COMP (Pin 5) | Compensation & shutdown | Output of transconductance error amplifier; pull ≤0.17V to enter shutdown (IQ ≤1mA); connect RC network for loop stability. |
| PGND (Pin 6) | Power ground | Internally tied to GND but routed separately; carries high-frequency inductor return current - must connect to power plane under LX/IN pins. |
| LX (Pin 7) | Switch node | Drives external 2µH inductor; contains integrated PMOS high-side and NMOS low-side FETs; peak current capability 4.5A (high-side limit). |
| IN (Pin 8) | Main power input | Accepts 2.6–5.5V; requires ≥10µF ceramic capacitor to PGND; 10Ω resistor to VCC improves EMI and stabilizes VCC during LX transitions. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode - reduces conduction loss, improves efficiency by 3–5%, and simplifies BOM. |
| All-ceramic design support | Validated with 10µF input / 10µF output ceramic capacitors - avoids electrolytic aging, lowers ESL, and enables ultra-thin PCB profiles. |
| Digital soft-start | Ramps REF and FB voltages gradually - limits inrush current to <1.5× steady-state peak, preventing input rail collapse during power-up. |
| Current-mode control | Inherent cycle-by-cycle current limiting and fast transient response - achieves <100µs recovery from 50% load steps without external compensation tuning. |
| Thermal and short-circuit protection | Auto-restarts after junction cools 15°C post-shutdown - sustains safe operation under sustained overload without latch-off or manual reset. |
Applications
| ASIC/DSP Core Supply | Cellular Base Station I/O |
|---|---|
|
Use Scenario: Powering 1.8V I/O banks of LTE baseband processors in outdoor small cells with ambient temperatures up to +85°C. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering clean, regulated 1.8V at up to 2A with minimal external components. Use Value: 94% efficiency at 3.3VIN/1.8VOUT reduces heat sink requirements; ±1.5% accuracy ensures signal integrity across voltage margining tests. |
Use Scenario: Generating 1.8V auxiliary rail for RF front-end ICs and clock buffers in distributed antenna systems (DAS). IC Role / Device Role / Timing Role: Post-regulator stepping down 3.3V system rail to noise-sensitive 1.8V analog/digital interface supply. Use Value: 1MHz switching frequency enables use of tiny 2µH shielded inductors; all-ceramic support eliminates capacitor derating concerns at +85°C. |
| Set-Top Box SoC I/O | Networking PHY Interface |
|
Use Scenario: Supplying 1.8V I/O voltage to video decoder SoCs in consumer STBs operating from 5V wall adapters. IC Role / Device Role / Timing Role: High-efficiency, low-noise buck converter with integrated power switches and soft-start. Use Value: Digital soft-start prevents HDMI hot-plug glitches; thermal shutdown protects against enclosure overheating during extended streaming sessions. |
Use Scenario: Providing 1.8V supply to 10G Ethernet PHYs in enterprise switches where board space and thermal density are constrained. IC Role / Device Role / Timing Role: Compact, high-frequency DC-DC regulator replacing discrete controller + external MOSFETs. Use Value: 8-pin SO footprint (0.385in² total circuit area) saves >30% board space vs. typical 16-pin controllers; synchronous operation cuts ripple below 15mVpp. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3–17V input, 1.8V fixed output, 3A rating, 2.5MHz switching - higher input range and current, but requires larger input capacitance for stability at low VIN. | Better suited for wide-input industrial rails (e.g., 12V intermediate bus); less optimal for battery-powered 3.3V systems due to lower light-load efficiency. | Select when input exceeds 5.5V or >2A output is required; verify loop stability with 4.7µH inductor due to higher fSW. |
| RT8059NGSP | 2.5–5.5V input, 1.8V fixed output, 2A rating, 1.5MHz switching - includes enable pin and power-good flag, but lacks internal REF bypass capacitor requirement. | Preferred for designs needing power sequencing or status monitoring; slightly lower peak efficiency (92%) at 3.3V→1.8V due to gate drive losses. | Choose when system-level power management requires EN/PG signals; confirm thermal performance with 1.5MHz-induced skin effect in PCB traces. |
Compared with TPS62130ARGTR and RT8059NGSP, the MAX1952ESA+T offers tighter output accuracy (±1.5% vs. ±2%), simpler layout (no EN/PG routing), and optimized 1MHz operation for minimal EMI filtering - making it ideal for cost-sensitive, thermally constrained 3.3V-fed applications.
Availability
MAX1952ESA+T is available at Aetrix Electronics and suitable for ASIC/DSP core supplies, cellular base station I/O rails, and set-top box SoC power delivery requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for MAX1952ESA+T 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 demanding industrial, automotive, and communications applications.
The MAX195x family targets compact, high-efficiency DC-DC conversion for post-regulation in space-constrained embedded systems - emphasizing low-component-count designs, ceramic-capacitor compatibility, and robust fault protection.
FAQ
What is the guaranteed output accuracy of the MAX1952ESA+T over temperature and load?
The MAX1952ESA+T guarantees ±1.5% output voltage accuracy over the full –40°C to +85°C operating temperature range and across 0–2A load current. This specification is confirmed in the Electrical Characteristics table (page 4) for the MAX1952 variant, with FB regulation voltage specified as 1.764V to 1.836V at VIN = 2.6V to 5.5V and TA = –40°C to +85°C. The MAX1952ESA+T achieves this using an internal precision resistor divider referenced to a 2.0V bandgap.
Does the MAX1952ESA+T require external feedback resistors to set its 1.8V output?
No, the MAX1952ESA+T does not require external feedback resistors. Its 1.8V output is preset internally - Pin 4 (FB) is connected directly to the output node per the Typical Operating Circuit (page 1). Unlike the adjustable MAX1951, the MAX1952ESA+T uses an internal resistor divider to fix the feedback ratio, eliminating component count, layout sensitivity, and resistor tolerance errors. This is explicitly stated in the Features section and Ordering Information table.
What is the maximum allowable input voltage for the MAX1952ESA+T, and what happens if exceeded?
The MAX1952ESA+T has an absolute maximum IN voltage rating of +6V, but its functional operating range is strictly 2.6V to 5.5V per the Absolute Maximum Ratings and Electrical Characteristics tables. Exceeding 5.5V risks violating the specified operating conditions - potentially causing increased switching losses, thermal stress beyond θJA limits, or premature degradation. Sustained operation above 5.5V voids parametric guarantees and may trigger undervoltage lockout instability or accelerated wear of internal PMOS/NMOS switches.
How does the MAX1952ESA+T implement shutdown, and what is the shutdown current?
The MAX1952ESA+T enters shutdown when Pin 5 (COMP) is pulled to GND, reducing quiescent current to ≤1.0mA (typical 0.5mA) as specified in the Electrical Characteristics table. During shutdown, internal MOSFETs stop switching, LX goes high-impedance, and REF is shorted to GND. Release of COMP initiates digital soft-start. This method avoids external enable logic and ensures predictable, low-IQ state control - critical for battery-backed systems where MAX1952ESA+T standby consumption must remain sub-1mA.
Can the MAX1952ESA+T safely drive a 2A load continuously, and what thermal considerations apply?
Yes, the MAX1952ESA+T is rated for guaranteed 2A continuous output current. Its thermal design supports this under defined conditions: with θJA = 82°C/W on a standard 4-layer board, power dissipation at 3.3VIN/1.8VOUT/2A is ~300mW, resulting in ~25°C junction rise above ambient - well below the +150°C max junction temperature. For sustained 2A operation, maintain adequate copper area on PGND, avoid enclosing the SO package, and ensure airflow or heatsinking if ambient exceeds +60°C.
MAX1952ESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX1952ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1952ESA+T 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+T reliable?
The price and inventory of MAX1952ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1952ESA+T is usually 5 days.
3.What payment methods are accepted for MAX1952ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1952ESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1952ESA+T?
MAX1952ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1952ESA+T 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+T?
For technical support, including MAX1952ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1952ESA+T requirements.
6.How does Aetrix verify that MAX1952ESA+T is sourced from the original manufacturer or authorized distributors?
All MAX1952ESA+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX1952ESA+T?
All MAX1952ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1952ESA+T, 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+T part is unused and in its original packaging.
Return procedure for MAX1952ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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