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Analog Devices Inc./Maxim Integrated MAX1947ETA18-T
- Part No.:
- MAX1947ETA18-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX1947ETA18-T.pdf
- Description:
- IC REG BOOST 1.8V 273MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:50,000
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Product details
Overview
The MAX1947ETA18-T from Maxim Integrated is a fixed-output 1.8V, high-efficiency synchronous step-up DC-DC converter designed for ultra-low-voltage battery-powered systems. It starts up from as low as 0.8V input, delivers up to 40mA output current at 1.8V, integrates an 800mA internal NFET switch and PFET synchronous rectifier, and provides a 75ms active-low RESET flag - enabling reliable power-on reset in MP3 players, digital cameras, and portable medical devices.
For engineers reviewing the MAX1947ETA18-T datasheet, MAX1947ETA18-T pinout, MAX1947ETA18-T application, or MAX1947ETA18-T equivalent, key selection criteria include its 0.7V minimum operating input voltage, 94% peak efficiency, 2µA True Shutdown™ current, TDFN-8 (3mm × 3mm) package with exposed paddle, and integrated RESET timing without external components.
Technical Context
The MAX1947ETA18-T employs a bootstrapped startup oscillator followed by a minimum-off-time, current-limited control architecture that blends PWM-like efficiency with pulse-skipping quiescent current reduction. Its synchronous rectification eliminates external Schottky diodes while maintaining <0.3Ω PFET on-resistance at 100mA.
It operates in track mode when BATT exceeds 1.8V, fully turning on the PFET to let VOUT follow VBATT; regulation resumes only when VOUT falls below 1.8V. The 75ms RESET timer activates once VOUT reaches ≥90% of 1.8V (≥1.62V), with validity guaranteed down to 0.9V output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±3% (1.74V–1.86V) at 40mA load; no feedback network required |
| Startup Input Voltage | 0.8V (min) at 25°C; enables operation from single-cell alkaline/NiMH at end-of-life |
| Peak Efficiency | 94% at 1.5V input / 1.8V output / 100mA load; enabled by synchronous rectification |
| Quiescent Current | 70µA (typ) at OUT pin; extends runtime in light-load portable applications |
| True Shutdown Current | 2µA (max); actively discharges VOUT to GND via 500Ω internal resistor |
| RESET Timeout | 75ms (min) delay after VOUT ≥1.62V; push-pull output valid down to 0.9V VOUT |
| Switching Frequency | Up to 2MHz; allows use of small 4.7µH inductor and 4.7µF/10µF ceramic capacitors |
Pinout & Package
MAX1947ETA18-T is housed in an 8-pin TDFN package (3mm × 3mm × 0.8mm) with exposed thermal paddle (EP), rated for -40°C to +85°C operation. The exposed paddle must be soldered to PCB ground for thermal performance and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset flag | Asserts low during startup and shutdown; goes high 75ms after VOUT ≥90% of 1.8V |
| 2,3 - GND | Analog ground reference | Must connect to exposed paddle; forms low-impedance return for error amplifier and bias circuits |
| 4 - SHDN | Logic-controlled shutdown enable | Drive low to enter 2µA shutdown; drive high (≥0.8×VBATT) for normal operation |
| 5 - PGND | Power ground return path | Carries high-frequency switch current; connect directly to exposed paddle to minimize noise |
| 6 - LX | Switch node connection | Drives external 4.7µH inductor; connects internally to drains of NFET and PFET switches |
| 7 - OUT | Regulated 1.8V output | Bypass with 10µF ceramic cap for full load; 4.7µF sufficient for ≤50% load |
| 8 - BATT | Input supply and startup oscillator source | Accepts 0.7V–3.6V; powers chip before regulation; enables track mode when >1.8V |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode; reduces conduction loss and board area using integrated PFET |
| True Shutdown™ | Actively discharges VOUT to GND via 500Ω resistor; prevents floating rail and ensures clean system reset |
| Ultra-low startup voltage | 0.8V minimum enables use with single-cell batteries down to 0.7V operating range |
| Integrated RESET timer | 75ms fixed delay with 1% hysteresis; eliminates need for external RC timing or supervisor IC |
| Ceramic capacitor optimized | Designed for low-ESR X5R/X7R ceramics only; supports 2.2µF input and 4.7µF/10µF output caps |
Applications
| MP3 Players & Portable Audio | Digital Still Cameras |
|---|---|
|
Use Scenario: Powering 1.8V DSP core and memory from single AA/AAA alkaline cell. IC Role / Device Role / Timing Role: Primary step-up regulator delivering stable 1.8V rail with POR signaling via RESET. Use Value: Enables operation down to 0.7V input, extending playback time by >20% vs. non-synchronous boosters. |
Use Scenario: Supplying 1.8V image sensor interface and flash controller in compact camera modules. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter with integrated RESET for deterministic sensor initialization. Use Value: 94% efficiency at 100mA reduces thermal load in sealed enclosures; 2MHz switching minimizes EMI near imaging sensors. |
| Wireless Keyboards/Mice | Portable Medical Monitors |
|
Use Scenario: Generating 1.8V logic rail from NiMH coin cell in ultra-thin human-interface devices. IC Role / Device Role / Timing Role: Low-quiescent-current boost converter with automatic pulse skipping during sleep cycles. Use Value: 70µA operating current and 2µA shutdown extend battery life to >12 months in typical usage. |
Use Scenario: Providing regulated 1.8V supply for microcontroller and analog front-end in handheld ECG units. IC Role / Device Role / Timing Role: Safety-critical power rail generator with validated RESET assertion for firmware integrity checks. Use Value: RESET remains valid down to 0.9V VOUT, ensuring reliable boot even during brownout conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61201DRCT | Adjustable output (1.8V–3.3V); requires external feedback resistors; 92% peak efficiency; no integrated RESET | Lacks built-in POR functionality; requires external supervisor IC for reset timing | Choose when output voltage flexibility outweighs RESET integration and board space savings |
| SP6652ER-L/TR | Fixed 1.8V output; 90% peak efficiency; 1.2V min startup; no RESET; 6-pin SOT-23 package | Smaller footprint but higher dropout and no power-good signaling | Choose for cost-sensitive, space-constrained designs where RESET is handled elsewhere |
Compared with TPS61201DRCT and SP6652ER-L/TR, the MAX1947ETA18-T uniquely combines fixed 1.8V regulation, integrated 75ms RESET, 0.8V startup, and True Shutdown™ in a thermally enhanced TDFN-8 - reducing BOM count and improving system-level reliability in battery-critical portable devices.
Availability
MAX1947ETA18-T is available at Aetrix Electronics and suitable for MP3 players, digital still cameras, wireless peripherals, portable medical equipment, and other battery-powered systems requiring stable component supply with long-term lifecycle support.
Supply support for MAX1947ETA18-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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and consumer applications.
The MAX1947ETA18-T belongs to Maxim's ultra-low-voltage DC-DC converter product line, engineered specifically for single- and dual-cell battery systems where startup voltage, quiescent current, and integrated power sequencing are critical.
FAQ
What is the minimum input voltage required for the MAX1947ETA18-T to start up?
The MAX1947ETA18-T starts up from a minimum input voltage of 0.8V at +25°C (0.95V max over full temperature range). This enables reliable operation from aging single-cell alkaline or NiMH batteries. Startup voltage increases slightly with temperature at –2.1mV/°C, and the device continues regulating down to 0.7V once started. The MAX1947ETA18-T is explicitly characterized for this ultra-low startup behavior in its Absolute Maximum Ratings and Electrical Characteristics tables.
Does the MAX1947ETA18-T require external compensation components?
No, the MAX1947ETA18-T does not require external compensation components. As a fixed-output converter, it uses internal feedback and compensation networks optimized for 1.8V regulation. The datasheet confirms "no feedback or compensation network" is needed, and the Typical Application Circuit shows only an inductor, input/output capacitors, and optional input filter - all standard passive components with no tuning elements. This simplifies design and improves production consistency for the MAX1947ETA18-T.
How does the RESET output of the MAX1947ETA18-T behave during shutdown?
During shutdown (SHDN = GND), the RESET output of the MAX1947ETA18-T is driven low - matching its active state. This ensures consistent reset assertion across power transitions. The datasheet Pin Description explicitly states "RESET is driven low in shutdown", and the EXITING AND ENTERING SHUTDOWN WAVEFORMS (Figure MAX1947toc18) confirm RESET remains low until VOUT stabilizes above 90% of 1.8V after SHDN is released. This behavior guarantees safe microcontroller reset sequencing for the MAX1947ETA18-T.
Can the MAX1947ETA18-T operate in track mode, and what triggers it?
Yes, the MAX1947ETA18-T enters track mode when three conditions are met simultaneously: BATT > 1.8V (output regulation point), VOUT > 1.8V, and the minimum off-time expires. In track mode, the internal PFET turns on 100% of the time, causing VOUT to closely follow VBATT minus small conduction drop. Track mode exits automatically when VOUT falls below 1.8V. This feature is documented in the "Track Mode" section of the MAX1947ETA18-T datasheet and improves efficiency in higher-battery-voltage conditions.
What is the maximum continuous output current supported by the MAX1947ETA18-T at 1.8V?
The MAX1947ETA18-T supports a maximum continuous output current of 40mA at 1.8V output, as specified in the Electrical Characteristics table under "Output Voltage" test condition. This value is confirmed across temperature (–40°C to +85°C) and correlates with the "Full-Load Output Current" row showing 160mA/273mA at VBATT = 1V and 1.8V respectively - with the 40mA rating reflecting practical sustained load capability under typical operating conditions. Derating applies at elevated ambient temperatures per the package's thermal limits.
MAX1947ETA18-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.7V
- Voltage - Input (Max):
- 3.6V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 273mA
- Frequency - Switching:
- Up to 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN-EP (3x3)
MAX1947ETA18-T FAQ
1.How can I place an order for MAX1947ETA18-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1947ETA18-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 MAX1947ETA18-T reliable?
The price and inventory of MAX1947ETA18-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1947ETA18-T is usually 5 days.
3.What payment methods are accepted for MAX1947ETA18-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1947ETA18-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1947ETA18-T?
MAX1947ETA18-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1947ETA18-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 MAX1947ETA18-T?
For technical support, including MAX1947ETA18-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1947ETA18-T requirements.
6.How does Aetrix verify that MAX1947ETA18-T is sourced from the original manufacturer or authorized distributors?
All MAX1947ETA18-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 MAX1947ETA18-T meets industry standards.
7.What is the process for return or replacement of MAX1947ETA18-T?
All MAX1947ETA18-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1947ETA18-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 MAX1947ETA18-T part is unused and in its original packaging.
Return procedure for MAX1947ETA18-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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