MAX1642
High-Efficiency Step-Up DC-DC Converters for 1V Inputs
We Recommend Improved Performance Device, MAX1678, for New Designs
Part Details
- Built-In Synchronous Rectifier
- 0.88V Guaranteed Start-Up
- Ultra-Small µMAX Package: 1.1mm High
- 83% Efficiency
- 4µA Quiescent Supply Current into BATT Pin
- 2µA Logic-Controlled Shutdown (MAX1642)
- Two Undervoltage Detectors (MAX1643)
- 2V to 5.2V Output Range
- 20mA Output Current at 1.2V Input
- Reverse Battery Protection
The MAX1642/MAX1643 are high-efficiency, low-voltage, step-up DC-DC converters intended for devices powered by a single alkaline cell. They feature low quiescent supply currents and are supplied in the ultra-small µMAX® package, which is only 1.1mm high. The guaranteed start-up voltage is 0.88V.
Each device consists of an internal 1Ω, N-channel MOSFET power switch; a built-in synchronous rectifier that acts as the catch diode; an oscillator; a reference; and pulse-frequency-modulation (PFM) control circuitry. Both devices feature an independent undervoltage comparator (PFI/PFO). The MAX1642 also includes a 2µA logic-controlled shutdown mode. The MAX1643 offers a dedicated low-battery detector (BATTLO) in lieu of shutdown.
The output voltage for each device is preset to 3.3V ±4%, or can be adjusted from +2V to +5.2V using only two resistors.
Applications
- Pagers
- Personal Medical Monitors
- Pointing Devices
- Remote Controls
- Single-Cell Battery-Powered Devices
Documentation
This is the most up-to-date revision of the Data Sheet.
Hardware Ecosystem
Parts | Product Life Cycle | Description |
---|---|---|
Internal Power Switch Boost Regulators 1 | ||
MAX1678 | PRODUCTION | 1 Cell to 2 Cell, Low-Noise, High-Efficiency, Step-Up DC-DC Converter |
Latest Discussions
No discussions on max1642 yet. Have something to say?
Start a Discussion on EngineerZone®