MAX1947
PRODUCTIONLow Input/Output Voltage Step-Up DC-DC Converter with Active-Low RESET
Smallest 1.8V Output Step-Up Converter with True Shutdown for 1-/2-Cell Alkaline Handhelds
- Part Models
- 5
- 1ku List Price
- Starting From $2.60
Overview
- Low Input (0.7V) and Output (1.8V) Voltage Capability
- Internal Synchronous Rectifier
- High 94% Efficiency
- Fixed Output Voltages: 1.8V, 2.5V, 3V, and 3.3V
- Up to 2MHz Switching Allows Small External Components and Low Output Ripple
- Automatic Pulse Skipping at Light Loads for Extended Battery Life
- Low 70µA (typ) Operating Supply Current (Measured at OUT)
- Low 2µA Logic-Controlled Shutdown
- True Shutdown Fully Discharges Output to Ground
- Uses Only Small Ceramic Capacitors
- 75ms Active-Low RESET Output Flag
The MAX1947 is a compact, high-efficiency, step-up DC-DC converter that regulates output voltages from 1.8V to 3.3V to power µP/DSP cores, memory, and I/O rails in 1-and 2-cell alkaline/NiMH/NiCd battery-powered systems. It features an internal 800mA switch and synchronous rectifier to achieve up to 94% efficiency and to eliminate the need for an external Schottky diode.
High-frequency switching (up to 2MHz) results in low ripple and small external components, while automatic pulse skipping at light loads reduces supply current to just 70µA for extended battery life. Maxim's proprietary True Shutdown™ reduces supply current to just 2µA and fully discharges the output to ground. The converter is offered in fixed-output voltages of 1.8V, 2.5V, 3.0V, and 3.3V, requiring no feedback or compensation network. A 75ms active-low RESET output flag provides for power-on reset (POR) and undervoltage detection. The MAX1947 is available in a space-saving 8-pin TDFN package.
Applications
- Cordless Phones
- Digital Still Cameras
- MP3 Players, Pagers, and CD Players
- Other Battery-Powered Systems
- PDAs and Organizers
- Portable Medical Equipment
- Wireless Mice/Keyboards
Documentation
Data Sheet 1
Technical Articles 4
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| MAX1947ETA18+ | Thin Dual Flatpack No Leads, Exposed Pad | ||
| MAX1947ETA30+ | Thin Dual Flatpack No Leads, Exposed Pad | ||
| MAX1947ETA30+T | Thin Dual Flatpack No Leads, Exposed Pad | ||
| MAX1947ETA33+ | Thin Dual Flatpack No Leads, Exposed Pad | ||
| MAX1947ETA33+T | Thin Dual Flatpack No Leads, Exposed Pad |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Jun 20, 2016 - 1612 ASSEMBLY |
||
| MAX1947ETA18+ | Obsolete | |
| MAX1947ETA30+ | PRODUCTION | |
| MAX1947ETA30+T | PRODUCTION | |
| MAX1947ETA33+ | PRODUCTION | |
| MAX1947ETA33+T | PRODUCTION | |
|
Apr 27, 2024 - 2400 ASSEMBLY |
||
| MAX1947ETA30+ | PRODUCTION | |
| MAX1947ETA30+T | PRODUCTION | |
| MAX1947ETA33+ | PRODUCTION | |
| MAX1947ETA33+T | PRODUCTION | |
|
Apr 20, 2026 - 2571D PIN/ERRATA |
||
| MAX1947ETA30+T | PRODUCTION | |
| MAX1947ETA33+T | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Switching Regulators & Controllers 3 | ||
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| MAX1797 | PRODUCTION | Low-Supply Current, Step-Up DC-DC Converters with True Shutdown |
| MAX1722 | PRODUCTION | 1.5µA IQ, Step-Up DC-DC Converters in TSOT and µDFN |
Evaluation Kits
Evaluation Kit for the MAX1947
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