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Analog Devices Inc./Maxim Integrated MAX1857EUA47+
- Part No.:
- MAX1857EUA47+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX1857EUA47+.pdf
- Description:
- IC REG LIN POS ADJ 500MA 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,858
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Product details
Overview
MAX1857EUA47+ from Maxim Integrated is a 500mA, low-dropout linear regulator with ±1% output voltage accuracy preset at 4.75V, 120mV dropout at full load, 135µA ground current, and integrated active-low open-drain reset output with 4.5ms timeout-designed for stable power delivery in portable battery-powered systems such as notebook computers and cellular handsets.
For engineers reviewing the MAX1857EUA47+ datasheet, MAX1857EUA47+ pinout, MAX1857EUA47+ application, or MAX1857EUA47+ equivalent, key selection considerations include guaranteed 500mA output under 120mV dropout, thermal shutdown at +170°C, 0.1µA shutdown current, and dual-mode SET pin configuration enabling either factory-preset or adjustable (1.25V–5.0V) operation.
Technical Context
The MAX1857EUA47+ employs an internal P-channel MOSFET pass transistor with 0.25Ω RDS(ON), eliminating base-drive current and enabling stable quiescent current (135µA typical) independent of load. Its error amplifier compares a 1.25V reference against feedback from either internal resistors (preset mode) or external divider (adjustable mode), selected by the SET pin voltage threshold (50–150mV).
Reset functionality is implemented via a comparator monitoring VOUT against 86% of nominal output, asserting active-low RST after ≥4.5ms delay upon regulation recovery; RST is open-drain and requires external pullup to OUT. Thermal protection activates at +170°C with 20°C hysteresis, cycling output during sustained overload.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Preset 4.75V ±1% over -40°C to +85°C - ensures stable logic supply for 4.75V-tolerant microcontrollers and USB peripherals. |
| Dropout Voltage | 120mV at 500mA - enables operation down to VIN = 4.87V while maintaining regulation, extending usable battery life in Li-ion systems. |
| Ground Current | 135µA at 1mA load - minimizes standby power loss in always-on subsystems like real-time clocks or wake-up circuitry. |
| Shutdown Current | 0.1µA - supports ultra-low-power sleep modes in portable devices without compromising fast wake-up capability. |
| Reset Threshold | 86% of nominal VOUT with 4.5ms release delay - provides reliable power-on-reset timing for µC initialization without external RC networks. |
| Thermal Shutdown | +170°C activation with +20°C hysteresis - prevents permanent damage during transient overloads while allowing self-recovery under intermittent stress. |
| PSRR | 60dB at 1kHz (COUT = 3.3µF) - suppresses switching noise from upstream DC-DC converters, critical for analog/RF sections. |
Pinout & Package
Package: 8-pin µMAX (3mm × 3mm, 0.8mm height, exposed pad), RoHS-compliant, thermally enhanced for high-current LDO operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 IN | Regulator input supply | Dual pins internally connected; accept 2.5V–5.5V input; require ≥1µF bypass to GND for stability and transient response. |
| 3 RST | Open-drain active-low reset output | Asserts low when VOUT < 86% nominal; releases high-Z after 4.5ms; requires external 100kΩ pullup to OUT for µC POR signaling. |
| 4 SHDN | Active-low shutdown control | Pull low to reduce IQ to 0.1µA; disconnects OUT from IN; forces RST low and discharges OUT via internal 5kΩ resistor. |
| 5 GND | Power and signal reference ground | Common return path for input/output capacitors and feedback network; must be low-impedance connection to minimize noise coupling. |
| 6 SET | Voltage-setting mode selector | Connect to GND for 4.75V preset; apply external divider for 1.25V–5.0V adjustment; threshold 50–150mV determines mode selection. |
| 7, 8 OUT | Regulated output source | Dual pins internally connected; deliver up to 500mA; require ≥3.3µF low-ESR (≤0.1Ω) capacitor to GND for stability and ripple rejection. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed 500mA output current | Delivers full rated load across full temperature range (-40°C to +85°C) without derating, supporting high-current peripherals like USB transceivers. |
| Low 120mV dropout at 500mA | Enables operation with minimal headroom-e.g., 4.75V output from 4.87V input-maximizing battery utilization in single-cell Li-ion applications. |
| ±1% output voltage accuracy (preset) | Meets tight tolerance requirements for I/O supply rails in FPGAs, ASICs, and high-speed interfaces without external trimming. |
| Integrated reset with 4.5ms timeout | Eliminates need for discrete reset IC or RC timing network, reducing BOM count and PCB area in space-constrained portable designs. |
| 0.1µA shutdown current | Supports multi-week shelf life in battery-backed systems (e.g., medical sensors, asset trackers) without significant capacity drain. |
| Thermal shutdown with 20°C hysteresis | Provides fail-safe protection during short-circuit or overload events while enabling automatic recovery once junction cools, avoiding latch-up. |
Applications
| Notebook Computers | Cellular Telephones |
|---|---|
Use Scenario: Powering core logic voltage (e.g., SoC I/O rail) from a shared 5V system bus. IC Role / Device Role / Timing Role: Primary LDO delivering stable 4.75V at up to 500mA with fast transient response to CPU burst loads. Use Value: Maintains regulation during 5mA→500mA load steps with ≤18mV overshoot, preventing logic glitches during processor wake-up. |
Use Scenario: Supplying RF front-end bias and baseband processor I/O in GSM/UMTS handsets. IC Role / Device Role / Timing Role: Low-noise, ripple-rejecting LDO filtering switching noise from PMIC buck converters. Use Value: 60dB PSRR at 1kHz suppresses DC-DC switching artifacts, preserving receiver sensitivity and transmitter spectral purity. |
| USB Hubs | Base Stations |
Use Scenario: Providing 4.75V VBUS-compatible power to downstream USB 2.0 ports. IC Role / Device Role / Timing Role: Load-switched LDO with SHDN-controlled enable and RST-monitored power-good signaling. Use Value: 0.1µA shutdown current meets USB suspend power budget; RST output satisfies USB enumeration timing requirements. |
Use Scenario: Biasing low-noise amplifiers (LNAs) and analog front-ends in small-cell femtocell units. IC Role / Device Role / Timing Role: Precision voltage source with ±1% accuracy and low output noise (115µVRMS) for analog signal chains. Use Value: 115µVRMS noise floor preserves SNR in sub-100MHz receive paths, avoiding degradation of adjacent-channel rejection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1763CS8-4.7#TRPBF | 4.7V fixed output, 500mA, 300mV dropout at full load, 100µA quiescent current, no integrated reset output. | Lacks RST functionality; requires external reset IC for power-on sequencing; better suited for non-critical bias rails. | Select when reset signaling is handled elsewhere and higher dropout is acceptable for cost-sensitive industrial designs. |
| TLS850B2TE/V33 | 5V output, 500mA, 200mV dropout, AEC-Q100 qualified, integrated watchdog and window reset, automotive-grade temp range. | Designed for automotive ECUs; includes safety features (watchdog, window reset) not present in MAX1857EUA47+. | Choose for automotive applications requiring functional safety compliance; not drop-in due to different pinout and reset architecture. |
Compared with LT1763CS8-4.7#TRPBF and TLS850B2TE/V33, the MAX1857EUA47+ uniquely combines 120mV dropout, integrated 4.5ms reset, and 0.1µA shutdown in a miniature µMAX package-making it optimal for portable consumer electronics where size, efficiency, and self-contained power sequencing are critical.
Availability
MAX1857EUA47+ is available at Aetrix Electronics and suitable for notebook computers, cellular telephones, and USB hubs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MAX1857EUA47+ 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 consumer markets.
The MAX1857EUA47+ belongs to Maxim's precision LDO family designed specifically for battery-powered portable equipment demanding ultra-low quiescent current, low dropout, and integrated power-monitoring features like reset outputs.
FAQ
What is the guaranteed output voltage accuracy of the MAX1857EUA47+ across temperature and load?
The MAX1857EUA47+ guarantees ±1% output voltage accuracy over the full operating temperature range (-40°C to +85°C) and load current range (1mA to 500mA), with VIN > VOUT + 0.5V. This specification is confirmed in the Electrical Characteristics table under "Output Voltage Accuracy (Preset Mode)" and applies directly to the MAX1857EUA47+'s factory-trimmed 4.75V output.
Can the MAX1857EUA47+ be used in adjustable-output configurations?
Yes, the MAX1857EUA47+ supports adjustable output from 1.25V to 5.0V by connecting an external resistive divider between OUT and SET, while leaving SET unconnected to GND. The device's Dual Mode™ architecture detects VSET < 50mV to select preset mode; otherwise, it uses the external divider. This behavior is documented in the "Output Voltage Selection" section and confirmed in Figure 2 of the MAX1857EUA47+ datasheet.
What is the function and required external component for the RST pin on the MAX1857EUA47+?
The RST pin on the MAX1857EUA47+ is an active-low, open-drain reset output that asserts low when VOUT falls below 86% of nominal and remains low for ≥4.5ms after regulation is restored. It requires an external 100kΩ pullup resistor to OUT to generate a valid logic-high signal for microcontroller power-on-reset. This configuration is explicitly shown in the Typical Operating Circuit and Pin Description sections for the MAX1857EUA47+.
How does the MAX1857EUA47+ achieve low dropout voltage compared to bipolar-based LDOs?
The MAX1857EUA47+ achieves 120mV dropout at 500mA using an internal P-channel MOSFET pass transistor (RDS(ON) ≈ 0.25Ω), which eliminates base-drive current losses inherent in PNP-based regulators. Unlike bipolar designs that saturate and waste current in dropout, the MAX1857EUA47+ maintains 135µA ground current even under heavy load and in dropout-confirmed in the Electrical Characteristics table under "Ground-Pin Current".
Does the MAX1857EUA47+ include thermal protection, and what are its activation conditions?
Yes, the MAX1857EUA47+ includes thermal shutdown protection that activates at +170°C junction temperature and resets after cooling by 20°C hysteresis. This feature is verified in the Absolute Maximum Ratings and Electrical Characteristics tables, where "Thermal Shutdown Temperature" is specified as 170°C and "Thermal Shutdown Hysteresis" as 20°C-ensuring safe operation during sustained overload or poor heatsinking conditions.
MAX1857EUA47+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable (Fixed)
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.25V (4.75V)
- Voltage - Output (Max):
- 5.5V
- Voltage Dropout (Max):
- 0.175V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 250 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable, Reset
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX1857EUA47+ FAQ
1.How can I place an order for MAX1857EUA47+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1857EUA47+ 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 MAX1857EUA47+ reliable?
The price and inventory of MAX1857EUA47+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1857EUA47+ is usually 5 days.
3.What payment methods are accepted for MAX1857EUA47+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1857EUA47+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1857EUA47+?
MAX1857EUA47+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1857EUA47+ 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 MAX1857EUA47+?
For technical support, including MAX1857EUA47+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1857EUA47+ requirements.
6.How does Aetrix verify that MAX1857EUA47+ is sourced from the original manufacturer or authorized distributors?
All MAX1857EUA47+ 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 MAX1857EUA47+ meets industry standards.
7.What is the process for return or replacement of MAX1857EUA47+?
All MAX1857EUA47+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1857EUA47+, 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 MAX1857EUA47+ part is unused and in its original packaging.
Return procedure for MAX1857EUA47+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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