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Analog Devices Inc./Maxim Integrated MAX8557ETE+
- Part No.:
- MAX8557ETE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX8557ETE+.pdf
- Description:
- IC REG LINEAR POS ADJ 4A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:214
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Product details
Overview
MAX8557ETE+ from Maxim Integrated is a 4A ultra-low-input-voltage LDO regulator with p-channel MOSFET pass device, designed for point-of-load regulation in high-current digital systems. It operates from 1.425V to 3.6V input, delivers adjustable output from 0.5V to VIN − 0.2V (e.g., 1.5V @ 2mA), features 100mV typical dropout at 4A, ±1% output accuracy over load/line/temperature, and includes a 140ms power-on reset (POR) open-drain output.
For engineers reviewing the MAX8557ETE+ datasheet, MAX8557ETE+ pinout, MAX8557ETE+ application, or MAX8557ETE+ equivalent, this page provides verified technical context, exact pin functions, thermal design guidance for 16-pin TQFN-EP package, and validated alternatives for POR-enabled 4A LDO replacement in telecom and server power rails.
Technical Context
The MAX8557ETE+ uses an internal 25mΩ p-channel MOSFET pass transistor enabling stable operation down to 1.425V input without charge pump or external bias supply. Its feedback loop regulates FB to 0.5V with ±5mV threshold accuracy, supporting precise output setting via resistor divider.
It integrates dedicated POR circuitry that transitions to high-impedance 140ms after VOUT reaches 90% of nominal value, with fault detection at 440–460mV FB threshold and 25–200mV low-level output drive. Thermal shutdown activates at +160°C junction temperature and resets at +115°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 4A continuous - supports high-power ASIC/FPGA core rails without parallel devices. |
| Input Voltage Range | 1.425V to 3.6V - enables direct regulation from single-cell Li-ion or intermediate bus voltages. |
| Dropout Voltage | 100mV (typ) at 4A - minimizes power loss and heat generation under full load at low VIN. |
| Output Accuracy | ±1% over load/line/temperature - ensures reliable voltage margining for 1.5V logic domains. |
| Quiescent Current | 800μA (typ) - remains constant across load and dropout, simplifying power budgeting. |
| POR Delay | 140ms (typ) after 90% VOUT - provides deterministic system reset timing for microcontrollers and FPGAs. |
| Thermal Shutdown | +160°C trip / +115°C recovery - enables safe foldback-limited short-circuit operation without latch-off. |
Pinout & Package
The MAX8557ETE+ is housed in a 16-pin TQFN (5mm × 5mm) package with exposed paddle (EP), requiring solder connection to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–6, IN | LDO Input | Accepts 1.425V–3.6V supply; requires 2×10µF ceramic bypass to GND for stability at 4A. |
| 7–11, OUT | LDO Output | Delivers regulated output; bypass with 2×10µF low-ESR ceramics; ESR ≤ 0.05Ω required. |
| 12, POR | Power-On Reset Output | Open-drain; pulls low on fault/shutdown; high-impedance 140ms after VOUT ≥ 90% nominal. |
| 13, FB | Feedback Input | Senses 0.5V reference; connects to resistor divider center tap to set VOUT = 0.5V × (1 + R1/R2). |
| 14, GND | Ground | Primary return path; must connect to EP and system ground plane for thermal conduction. |
| 15, N.C. | No Connect | May be left floating or tied to GND; no internal connection or function. |
| 16, EN | Enable Input | Logic-controlled shutdown: low = disable (150μA max IQ); high or tied to IN = active. |
| EP | Exposed Paddle | Thermal and electrical ground; must be soldered to large copper area with ≥9 thermal vias. |
Key Features
| Feature | Design Value |
|---|---|
| p-Channel MOSFET Pass Device | Eliminates need for charge pump or external bias; enables 1.425V minimum input with stable transient response. |
| 140ms POR Output | Provides deterministic reset timing for downstream logic without external RC timing components. |
| Foldback Short-Circuit Protection | Limits output current to ~3A during fault, reducing power dissipation and enabling safe sustained operation. |
| Thermal Overload Recovery | Hysteresis between +160°C shutdown and +115°C restart prevents thermal cycling during overload. |
| Low-ESR Capacitor Stability | Stable with ≤0.05Ω output capacitor ESR - compatible with modern polymer and MLCC types. |
Applications
| Server Core Voltage Regulation | Optical Module Bias Supply |
|---|---|
Use Scenario: Regulating 1.5V core supply for high-performance CPUs and memory controllers in 1U rack servers. IC Role / Device Role / Timing Role: Primary point-of-load LDO delivering 4A with tight DC accuracy and fast transient response to handle burst current demands. Use Value: 100mV dropout at 4A reduces power loss by >300mW vs. higher-dropout alternatives, lowering thermal load on dense PCB layouts. | Use Scenario: Providing stable 1.5V bias to laser diode drivers and transimpedance amplifiers in SFP+/QSFP modules. IC Role / Device Role / Timing Role: Low-noise, low-ripple LDO with POR output synchronized to module power-up sequence. Use Value: 140ms POR delay ensures clean initialization of analog front-end before digital control logic asserts. |
| Base Station RF Power Amplifier Bias | ATE Load Point Regulation |
Use Scenario: Delivering 1.5V at up to 4A to GaN or LDMOS driver stages in macrocell base station transceivers. IC Role / Device Role / Timing Role: High-current LDO with thermal foldback protection to survive intermittent RF load transients and short circuits. Use Value: Built-in thermal shutdown with +160°C/+115°C hysteresis allows safe operation during RF burst events without system-level intervention. | Use Scenario: Generating precision 1.5V supply for DUT power in automated test equipment handling multi-die ICs. IC Role / Device Role / Timing Role: Adjustable LDO with ±1% output accuracy and POR signal used for test sequence synchronization. Use Value: FB accuracy of ±5mV (±1%) ensures voltage compliance across temperature, critical for parametric test repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A8300RGRT | 3A rated, 150mV dropout at 3A, 1.1V–3.3V input, integrated soft-start only - no POR output. | Lacks POR functionality; requires external reset IC for power sequencing. | Select when 3A output suffices and POR is handled externally. |
| NCP1117DT15RKG | 1A rated, 1.2V fixed output, 1.2V–20V input, no POR, TO-252 package - lower current, higher dropout (~1.1V at 1A). | Not suitable for 4A loads or 1.5V adjustable operation; lacks timing outputs. | Select only for low-current, cost-sensitive applications where POR and high current are unnecessary. |
Compared with MAX8557ETE+, TPS7A8300RGRT offers lower quiescent current but omits POR and delivers less current, while NCP1117DT15RKG is a legacy 1A part with incompatible package and no POR - neither matches the 4A + POR + 1.425V input capability of MAX8557ETE+.
Availability
MAX8557ETE+ is available at Aetrix Electronics and suitable for server power delivery, optical module biasing, base station RF amplification, and ATE load-point regulation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8557ETE+ 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 high-performance analog and mixed-signal ICs for power, interface, sensing, and timing applications.
The MAX8556/MAX8557 product line targets high-current, ultra-low-input-voltage LDO regulation in space-constrained telecom and computing systems where efficiency, thermal robustness, and precise power sequencing are critical.
FAQ
What is the maximum operating temperature range for MAX8557ETE+?
The MAX8557ETE+ is specified for operation from –40°C to +85°C ambient temperature. This rating is confirmed in the Ordering Information table and Electrical Characteristics section of the official datasheet. The device incorporates thermal shutdown at +160°C junction temperature, allowing safe operation within its rated ambient range even under full 4A load. MAX8557ETE+ does not share the +105°C rating of the MAX8556ETE+ variant.
Does MAX8557ETE+ support adjustable output voltage, and what is the minimum achievable value?
Yes, MAX8557ETE+ supports fully adjustable output voltage from 0.5V to VIN – 0.2V using an external resistor divider connected to the FB pin. The feedback reference is precisely 0.5V (±5mV), enabling accurate setting of 1.5V outputs as specified in the ordering context. Minimum output is constrained by the 0.5V FB threshold and stability requirements - outputs below 0.5V are not supported or guaranteed.
What is the purpose and behavior of the POR pin on MAX8557ETE+?
The POR (Power-On Reset) pin on MAX8557ETE+ is an open-drain output that transitions to high-impedance 140ms after the regulated output reaches 90% of its nominal value. It pulls low immediately upon output fault, thermal shutdown, or EN deactivation. An external pullup resistor to ≤3.6V logic supply is required. This function replaces external RC reset timers in systems requiring deterministic power sequencing, such as FPGA configuration or microcontroller boot.
Can MAX8557ETE+ operate with input voltage as low as 1.425V while delivering 4A output current?
Yes, MAX8557ETE+ is explicitly characterized to deliver up to 4A continuous output current with input voltage as low as 1.425V. The datasheet confirms 100mV typical dropout at 4A load under these conditions. This capability is enabled by the internal p-channel MOSFET pass device, which eliminates base-drive losses inherent in bipolar-based regulators and maintains stability without external charge pumps.
What package type and thermal considerations apply to MAX8557ETE+?
MAX8557ETE+ uses a 16-pin TQFN (5mm × 5mm) package with exposed paddle (EP). The EP must be soldered to a large PCB ground plane with ≥9 thermal vias to achieve the rated 2667mW power dissipation at +70°C ambient. Thermal resistance from junction to case (θJC) is 1.7°C/W. Failure to properly connect the EP results in rapid thermal shutdown under 4A load due to excessive junction temperature rise.
MAX8557ETE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 3.6V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 3.4V
- Voltage Dropout (Max):
- 0.2V @ 4A
- Current - Output:
- 4A
- Current - Quiescent (Iq):
- 1.6 mA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable, Power On Reset
- Protection Features:
- Over Current, Over Temperature, Short Circuit, Under Voltage Lockout (UVLO)
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (5x5)
MAX8557ETE+ FAQ
1.How can I place an order for MAX8557ETE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8557ETE+ 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 MAX8557ETE+ reliable?
The price and inventory of MAX8557ETE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8557ETE+ is usually 5 days.
3.What payment methods are accepted for MAX8557ETE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8557ETE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8557ETE+?
MAX8557ETE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8557ETE+ 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 MAX8557ETE+?
For technical support, including MAX8557ETE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8557ETE+ requirements.
6.How does Aetrix verify that MAX8557ETE+ is sourced from the original manufacturer or authorized distributors?
All MAX8557ETE+ 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 MAX8557ETE+ meets industry standards.
7.What is the process for return or replacement of MAX8557ETE+?
All MAX8557ETE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8557ETE+, 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 MAX8557ETE+ part is unused and in its original packaging.
Return procedure for MAX8557ETE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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