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Analog Devices Inc./Maxim Integrated MAX1947ETA18+
- Part No.:
- MAX1947ETA18+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX1947ETA18+.pdf
- Description:
- IC REG BOOST 1.8V 273MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,215
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Product details
Overview
MAX1947ETA18+ from Maxim Integrated is a fixed-output 1.8V, synchronous step-up DC-DC converter optimized for ultra-low-voltage battery-powered systems. It starts up from as low as 0.8V input, delivers up to 40mA full-load output current at 1.8V, achieves 94% peak efficiency, and integrates a 75ms active-low RESET flag for microcontroller power-on reset. It powers µP/DSP cores and I/O rails in single-cell alkaline/NiMH devices.
For engineers reviewing the MAX1947ETA18+ datasheet, MAX1947ETA18+ pinout, MAX1947ETA18+ application, or MAX1947ETA18+ equivalent, key selection criteria include startup voltage (0.8V min), True Shutdown™ discharge capability (500Ω internal pull-down), synchronous rectification (no external Schottky required), and TDFN-8 package compatibility with space-constrained portable designs.
Technical Context
The MAX1947ETA18+ employs a bootstrapped startup oscillator followed by a minimum-off-time, current-limited control scheme that blends PWM efficiency with pulse-skipping quiescent current reduction. Its architecture uses an internal 800mA n-channel switch and p-channel synchronous rectifier, enabling operation down to 0.7V input while maintaining regulation at 1.8V ±3% over load and temperature.
It features track mode when VBATT exceeds VOUT (e.g., >1.8V), where the PFET conducts continuously to pass battery voltage directly to OUT; it exits track mode when VOUT falls below 1.8V regulation threshold. The 75ms RESET timer activates only after VOUT reaches ≥90% of 1.8V (≥1.62V) and remains asserted during shutdown.
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 (typical); enables operation from nearly depleted 1-cell alkaline/NiMH batteries |
| Peak Efficiency | 94% at mid-load; achieved via synchronous rectification and <70µA quiescent current |
| Shutdown Current | 2µA max; True Shutdown™ actively discharges OUT to GND through 500Ω internal resistor |
| RESET Timeout | 75ms min delay after VOUT ≥1.62V; provides reliable POR signal for µC initialization |
| Switching Frequency | Up to 2MHz; enables use of small 4.7µH inductor and 10µF ceramic output capacitor |
| Internal Switch Rating | 800mA NFET current limit (typ); supports 40mA full-load output at 1.8V with 1.5V input |
Pinout & Package
MAX1947ETA18+ is housed in an 8-pin, 3mm × 3mm, 0.8mm-thick TDFN package (pkg code T833-1) with exposed paddle (EP) requiring connection to PGND/GND for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset output | Asserts low until VOUT ≥90% of 1.8V, then holds low for ≥75ms before going high; sinks 200µA, sources 0.8×VOUT |
| 2,3 - GND | Analog ground reference | Must connect to exposed paddle; forms low-impedance return path for error amplifier and bias circuitry |
| 4 - SHDN | Logic-controlled shutdown input | Driven low to enter 2µA shutdown; driven high (≥0.8×VBATT) for normal operation; bias current <10nA |
| 5 - PGND | Power ground | Connects to exposed paddle; carries high-current LX switching return path; separate from analog GND pins but tied at EP |
| 6 - LX | Switch node | Connects to inductor; drives internal NFET drain and PFET source; clamped internally to PGND and OUT |
| 7 - OUT | Regulated 1.8V output | Bypassed with 10µF ceramic cap to GND for full load; supports ≤4.7µF for <50% load |
| 8 - BATT | Battery input supply | Powers startup oscillator and chip bias; used when VOUT < VBATT; accepts 0.7V–3.6V input range |
Key Features
| Feature | Design Value |
|---|---|
| True Shutdown™ | 2µA shutdown current + active OUT-to-GND discharge (500Ω) eliminates floating output and leakage paths |
| Synchronous Rectification | Integrated PFET replaces external Schottky diode, reducing board area and improving efficiency by ~5–8% vs. asynchronous design |
| Ultra-Low Startup Voltage | 0.8V min startup enables use in deeply discharged 1-cell systems where competing boosters fail to initiate |
| Fixed 1.8V Output | No external resistors or compensation required; simplifies layout and eliminates tuning errors in high-volume portable production |
| 75ms RESET Flag | Dedicated POR signal synchronized to output regulation-avoids need for external supervisor IC in µP-based systems |
Applications
| MP3 Players & Portable Audio | Digital Still Cameras |
|---|---|
Use Scenario: Powering 1.8V image sensor interface and baseband processor core from single AA/AAA cell. IC Role / Device Role / Timing Role: Primary step-up regulator delivering stable 1.8V rail with fast transient response to burst-mode sensor readout. Use Value: Enables >10-hour playback on alkaline cells via 70µA no-load current and pulse-skipping light-load operation. |
Use Scenario: Supplying 1.8V logic for CMOS image sensor and SD card controller in compact point-and-shoot cameras. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter providing regulated core voltage independent of battery decay. Use Value: Maintains sensor timing accuracy and data integrity across 0.7V–1.6V input range without brownout resets. |
| Cordless Phones | Wireless Keyboards/Mice |
Use Scenario: Generating 1.8V supply for DSP codec and RF transceiver in DECT handsets powered by NiMH packs. IC Role / Device Role / Timing Role: High-efficiency boost converter supporting intermittent transmit bursts while minimizing average battery drain. Use Value: 94% peak efficiency and 2µA shutdown extend talk time and standby duration beyond competitive solutions. |
Use Scenario: Providing 1.8V logic rail for Bluetooth LE SoC and touchpad controller in ultra-thin wireless peripherals. IC Role / Device Role / Timing Role: Compact, low-noise voltage source enabling rapid wake-from-sleep transitions with minimal voltage droop. Use Value: 2MHz switching minimizes EMI near 2.4GHz band; TDFN-8 footprint fits sub-10mm PCB height constraints. |
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 (0.9V–5.5V); requires external feedback resistors; 90% peak efficiency; 1.8V startup | Supports multi-rail systems needing variable VOUT; lacks integrated RESET output | Select when output flexibility outweighs fixed-voltage simplicity and POR integration |
| LT1949ES5-1.8#TRMPBF | Fixed 1.8V output; 85% peak efficiency; 1.1V startup; no RESET; SOT-23-5 package | Lower cost and smaller footprint; insufficient for sub-1.1V battery start-up scenarios | Select for cost-sensitive, space-constrained apps where startup voltage >1.1V is guaranteed |
Compared with TPS61201DRCT and LT1949ES5-1.8#TRMPBF, MAX1947ETA18+ uniquely combines ultra-low 0.8V startup, integrated 75ms RESET, and True Shutdown™ discharge in a TDFN-8 package-making it optimal for legacy single-cell portable designs demanding reliability at end-of-battery-life.
Availability
MAX1947ETA18+ is available at Aetrix Electronics and suitable for MP3 players, digital still cameras, cordless phones, wireless keyboards/mice, and portable medical equipment requiring stable component supply across extended product lifecycles.
Supply support for MAX1947ETA18+ 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 applications.
The MAX1947ETA18+ belongs to Maxim's low-input-voltage DC-DC converter product line, designed specifically to extend runtime and enable miniaturization in single-cell battery-powered portable electronics.
FAQ
What is the minimum input voltage required for MAX1947ETA18+ to start switching?
The MAX1947ETA18+ has a typical startup input voltage of 0.8V and a maximum of 0.95V at 25°C with 1kΩ load. It can operate continuously down to 0.7V once started. This allows the MAX1947ETA18+ to function deep into battery discharge-critical for single-cell alkaline/NiMH systems where voltage drops below 1.0V under load.
Does MAX1947ETA18+ require external compensation components?
No. The MAX1947ETA18+ is a fixed-output converter with factory-trimmed 1.8V regulation, eliminating the need for external feedback resistors or compensation networks. All stability and transient response characteristics are internally optimized, simplifying design and reducing BOM count for the MAX1947ETA18+.
How does the RESET output of MAX1947ETA18+ behave during shutdown?
During shutdown (SHDN = GND), the RESET output of MAX1947ETA18+ is actively driven low. It remains low regardless of output voltage level and only transitions high after SHDN is released, VOUT rises above 90% of 1.8V (≥1.62V), and the internal 75ms timer expires-ensuring deterministic POR sequencing for the MAX1947ETA18+.
Can MAX1947ETA18+ be used with ceramic output capacitors smaller than 10µF?
Yes. The MAX1947ETA18+ supports a 4.7µF ceramic output capacitor when load current is less than 50% of full-scale (i.e., <20mA). At full 40mA load, a 10µF X5R/X7R ceramic capacitor is required to maintain output ripple <10mVP-P and ensure stability-both values are validated in the MAX1947ETA18+ typical application circuit.
What is the purpose of the PGND pin on MAX1947ETA18+ and how should it be connected?
The PGND pin on MAX1947ETA18+ serves as the high-current return path for the LX switch node and synchronous rectifier. It must be connected directly to the exposed paddle (EP) and tied to system ground at a single low-impedance point-separate from analog GND traces-to minimize ground bounce and preserve regulation accuracy in the MAX1947ETA18+.
MAX1947ETA18+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX1947ETA18+ FAQ
1.How can I place an order for MAX1947ETA18+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1947ETA18+ 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+ reliable?
The price and inventory of MAX1947ETA18+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1947ETA18+ is usually 5 days.
3.What payment methods are accepted for MAX1947ETA18+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1947ETA18+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1947ETA18+?
MAX1947ETA18+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1947ETA18+ 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+?
For technical support, including MAX1947ETA18+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1947ETA18+ requirements.
6.How does Aetrix verify that MAX1947ETA18+ is sourced from the original manufacturer or authorized distributors?
All MAX1947ETA18+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX1947ETA18+?
All MAX1947ETA18+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1947ETA18+, 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+ part is unused and in its original packaging.
Return procedure for MAX1947ETA18+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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