MAX1678
PRODUCTION1 Cell to 2 Cell, Low-Noise, High-Efficiency, Step-Up DC-DC Converter
Efficient 1-Cell Step-Up Converter for Pagers
- Part Models
- 2
- 1ku List Price
- Starting From $3.29
Overview
- 0.87V Guaranteed Start-Up
- Up to 90% Efficiency
- Built-In Synchronous Rectifier (no external diode)
- Ultra-Small µMAX Package, 1.1mm High
- 37µA Quiescent Current (85µA from 1.5V battery)
- 2µA Logic-Controlled Shutdown
- Power-Fail Detector
- Dual Mode™ Output: Fixed 3.3V
- Dual Mode Adjustable 2V to 5.5V
- 45mA Output Current at 3.3V for 1-Cell Input
- 90mA Output Current at 3.3V for 2-Cell Input
- Inductor-Damping Switch Suppresses EMI
The MAX1678 is a high-efficiency, low-voltage, synchronous-rectified, step-up DC-DC converter intended for use in devices powered by 1 to 3-cell alkaline, NiMH, or NiCd batteries or a 1-cell lithium battery. It guarantees a 0.87V start-up voltage and features a low 37µA quiescent supply current.
The device includes a 1Ω, N-channel MOSFET power switch, a synchronous rectifier that acts as the catch diode, a reference, pulse-frequency-modulation (PFM) control circuitry, and circuitry to reduce inductor ringing-all in an ultra-small, 1.1mm-high µMAX® package.
The output voltage is preset to 3.3V or can be adjusted from +2V to +5.5V using only two resistors. Efficiencies up to 90% are achieved for loads up to 50mA. The device also features an independent undervoltage comparator (PFI/PFO) and a logic-controlled 2µA shutdown mode.
Applications
- Pagers
- Personal Medical Monitors
- Pointing Devices
- Remote Controls
- Single-Cell Battery-Powered Devices
Documentation
Data Sheet 1
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 |
|---|---|---|---|
| MAX1678EUA+ | Micro-MAX, Thin Shrink Small-Outline | ||
| MAX1678EUA+T | Micro-MAX, Thin Shrink Small-Outline |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareEvaluation Kits
Evaluation Kit for the MAX1678
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