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Analog Devices Inc./Maxim Integrated MAX1947ETA18
- Part No.:
- MAX1947ETA18
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX1947ETA18.pdf
- Description:
- IC REG BOOST 1.8V 273MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:11,910
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Product details
Overview
MAX1947ETA18 from Maxim Integrated is a fixed-output 1.8V, high-efficiency 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 load current at 1.8V output, integrates an 800mA internal N-FET switch and synchronous P-FET rectifier, and features a 75ms active-low RESET output - enabling reliable power-on reset in MP3 players, digital cameras, and wireless peripherals.
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), light-load pulse-skipping operation (70µA quiescent current), 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 architecture that merges PWM efficiency with pulse-skipping ultra-low quiescent current. Its synchronous rectification eliminates external Schottky diodes, while track mode activates when BATT exceeds 1.8V, allowing output to follow battery voltage with 100% PFET conduction.
Internal circuitry includes a 1.25V reference, zero-crossing amplifier for body-diode control, current-limit amplifier (800mA typ), and a dedicated 75ms reset timer triggered when VOUT crosses 90% of regulation. The device operates across -40°C to +85°C and uses only ceramic capacitors (2.2µF input, 4.7–10µF output).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±3% (1.74V–1.86V) at 40mA load - eliminates feedback network and ensures stable core/I/O rail for µP/DSP in single-cell alkaline/NiMH systems. |
| Startup Input Voltage | 0.8V min (typ 0.95V) - enables operation from nearly-dead 1-cell batteries, extending usable runtime in portable medical and audio devices. |
| Efficiency | Up to 94% - achieved via synchronous rectification and low RDS(ON) (0.3Ω NFET / 0.7Ω PFET @ 100mA), reducing thermal load and PCB area. |
| Quiescent Current | 70µA (typ) at OUT - sustains >100-hour standby in pagers and cordless peripherals without compromising wake-up responsiveness. |
| Shutdown Current | 2µA logic-controlled - combined with True Shutdown™ active discharge (500Ω to GND), prevents floating outputs and system latch-up. |
| RESET Output | Active-low push-pull with 75ms timeout - provides deterministic POR timing for microcontrollers after VOUT reaches ≥90% of 1.8V (≥1.62V). |
| Switching Frequency | Up to 2MHz - permits use of small 4.7µH inductors and 2.2–10µF ceramic caps, minimizing solution size vs. lower-frequency boosters. |
Pinout & Package
MAX1947ETA18 is housed in an 8-pin TDFN package (3mm × 3mm × 0.8mm) with exposed paddle (EP) for thermal and electrical grounding. Pin 1 is marked with a "+" on lead-free variants. The package requires solder connection of EP to PGND/GND for optimal thermal performance and noise immunity.
| 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 ≥1.62V - directly interfaces µC reset inputs without external pull-ups or timers. |
| 2,3 - GND | Analog ground reference | Connect to exposed paddle; separates signal return from power ground to minimize noise coupling into error amplifier and reference. |
| 4 - SHDN | Logic-controlled shutdown enable | Drive low to enter 2µA shutdown with active output discharge; drive high (≥0.8×VBATT) for normal operation - compatible with battery or logic-level control. |
| 5 - PGND | Power ground return path | Low-impedance return for LX switch and synchronous rectifier currents; must be tied to EP and GND pins to prevent ground bounce. |
| 6 - LX | Switch node connection | Drain node of internal 800mA NFET and PFET; connects to inductor; requires short, wide trace to minimize EMI and switching losses. |
| 7 - OUT | Regulated 1.8V output | Bypass with 10µF ceramic cap (≥4.7µF for <50% load); supplies µP core/memory rails; actively discharged to GND in shutdown. |
| 8 - BATT | Battery input supply | Powers startup oscillator and internal circuitry; supports input range 0.7V–3.6V; enters track mode when VBATT > 1.8V. |
| EP - Exposed Paddle | Thermal & electrical ground | Mandatory connection to PGND/GND plane; critical for thermal dissipation (1951mW max at +70°C) and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| True Shutdown™ | Actively discharges OUT to GND via 500Ω internal resistor during shutdown - prevents unintended MCU wake-up or I/O leakage in battery-critical systems. |
| Synchronous Rectification | Integrated P-FET replaces external Schottky diode - reduces BOM count, saves ~1.5mm² board area, and improves light-load efficiency by eliminating forward-voltage drop. |
| Ultra-Low Startup Voltage | 0.8V minimum - enables operation from partially depleted 1-cell alkaline/NiMH batteries where competing converters fail to start. |
| Automatic Pulse Skipping | Reduces switching frequency under light loads - maintains >85% efficiency at 1mA while holding quiescent current to 70µA. |
| Fixed 1.8V Output | No external feedback resistors required - simplifies layout, eliminates resistor tolerance drift, and guarantees output accuracy across temperature (-40°C to +85°C). |
Applications
| MP3 Players & Digital Audio | Digital Still Cameras |
|---|---|
|
Use Scenario: Powering 1.8V DSP core and flash memory interface in compact, battery-operated audio players. IC Role / Device Role / Timing Role: Step-up regulator delivering regulated 1.8V from single 1.5V alkaline cell; provides POR via integrated RESET signal. Use Value: Enables full functionality down to 0.8V battery voltage, extending playback time by ~18% versus 1.0V-start competitors. |
Use Scenario: Supplying 1.8V image sensor interface and microcontroller I/O in pocket-sized digital cameras. IC Role / Device Role / Timing Role: Primary DC-DC converter with track mode support for battery voltage tracking during high-current burst modes. Use Value: Synchronous rectification and 2MHz switching reduce output ripple to <10mVP-P, preventing image sensor noise artifacts. |
| Wireless Keyboards/Mice | Portable Medical Monitors |
|
Use Scenario: Generating stable 1.8V rail for Bluetooth LE SoC and RF transceiver in ultra-thin human-interface devices. IC Role / Device Role / Timing Role: Low-quiescent-power boost converter with True Shutdown™ ensuring sub-µA system sleep current. Use Value: 2µA shutdown current + active output discharge extends shelf life and prevents false wake events during long-term storage. |
Use Scenario: Providing certified-safe 1.8V power for analog front-end and data-acquisition MCU in handheld ECG/SpO₂ monitors. IC Role / Device Role / Timing Role: Single-chip power solution meeting IEC 60601-1 creepage/clearance requirements via compact TDFN-8 footprint. Use Value: Fixed 1.8V output eliminates calibration drift from resistor networks, improving ADC reference stability over temperature. |
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 |
|---|---|---|---|
| TPS61200DRCT | Adjustable output (1.8–5.5V) via external resistors; higher 1.2A switch current; no integrated RESET. | Requires external POR circuitry; better suited for multi-rail systems needing flexible voltage scaling. | Select when adjustable output or higher current (>40mA) is required; avoid if RESET integration and minimal BOM are priorities. |
| ADP5070ARMZ-R7 | 1.2MHz fixed-frequency PWM; 200mA output; includes soft-start and overtemperature protection; no True Shutdown™ discharge. | Lacks active output discharge and ultra-low 0.8V startup; requires external reset IC for POR. | Choose for higher output current and robust protection features; not suitable for deep-battery-discharge or reset-integrated designs. |
Compared with TPS61200DRCT and ADP5070ARMZ-R7, the MAX1947ETA18 uniquely combines 0.8V startup, integrated 75ms RESET, and True Shutdown™ active discharge in a space-saving TDFN-8 package - making it optimal for cost-sensitive, battery-life-critical 1.8V single-rail applications.
Availability
MAX1947ETA18 is available at Aetrix Electronics and suitable for MP3 players, digital still cameras, and wireless peripherals requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
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, automotive, and portable applications.
The MAX1947 series was designed specifically for ultra-low-input-voltage, single-cell battery-powered systems - prioritizing startup capability below 1.0V, synchronous efficiency, and integrated power-good signaling in minimal footprint.
FAQ
What is the minimum input voltage required for MAX1947ETA18 to start up?
The MAX1947ETA18 has a minimum startup voltage of 0.8V (typical 0.95V) at +25°C with 1kΩ load. This allows reliable operation from nearly exhausted 1-cell alkaline or NiMH batteries. Startup voltage increases slightly with temperature - to ~1.0V at -40°C - and decreases under lighter loads. The MAX1947ETA18 datasheet specifies this parameter under "Minimum Startup Voltage" in the Electrical Characteristics table.
Does MAX1947ETA18 require external feedback components to set its 1.8V output?
No, the MAX1947ETA18 is a fixed-output converter with internally trimmed 1.8V regulation - no external feedback resistors or compensation network is needed. The output voltage is factory-set and guaranteed within ±3% (1.74V–1.86V) across load and temperature. This simplifies design, reduces BOM count, and avoids drift from resistor tolerance or thermal coefficients - a key advantage of the MAX1947ETA18 over adjustable boost controllers.
How does the RESET output of MAX1947ETA18 behave during power-up and shutdown?
The MAX1947ETA18 RESET pin is an active-low push-pull output. During power-up, RESET remains low until VOUT reaches ≥90% of 1.8V (≥1.62V), then a 75ms timer starts; RESET goes high only after this timeout expires. During shutdown (SHDN = GND), RESET is driven low immediately. The MAX1947ETA18 RESET function is fully integrated - no external RC timing network is required.
Can MAX1947ETA18 operate in track mode, and what triggers it?
Yes, the MAX1947ETA18 enters track mode when three conditions are met simultaneously: BATT voltage exceeds the 1.8V output regulation point, VOUT is already above 1.8V, and the minimum off-time timer expires. In track mode, the internal PFET conducts continuously, causing VOUT to closely follow VBATT - useful for maintaining headroom during high-current bursts. Track mode exits automatically when VOUT falls below 1.8V.
What is the purpose of the exposed paddle (EP) on the MAX1947ETA18 TDFN package?
The exposed paddle (EP) on the MAX1947ETA18 serves dual thermal and electrical functions: it must be soldered to a solid PGND/GND copper plane to dissipate heat (enabling 1951mW continuous power at +70°C) and to provide low-impedance grounding for both analog (GND) and power (PGND) returns. Failure to connect EP results in excessive junction temperature, degraded efficiency, and potential RESET timing inaccuracies - making it a mandatory layout requirement for the MAX1947ETA18.
MAX1947ETA18 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 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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