MAX1742
PRODUCTION1A/2.7A, 1MHz, Step-Down Regulators with Synchronous Rectification and Internal Switches
- Part Models
- 2
- 1ku List Price
- Starting From $6.35
Overview
- ±1% Output Accuracy
- 95% Efficiency
- Internal PMOS and NMOS Switches
- 90mΩ On-Resistance at VIN = 4.5V
- 110mΩ On-Resistance at VIN = 3V
- Output Voltage
- 2.5V, 1.8V, or 1.5V Pin Selectable
- 1.1V to VIN Adjustable
- 3V to 5.5V Input Voltage Range
- 600µA (max) Operating Supply Current
- <1µA Shutdown Supply Current
- Programmable Constant-Off-Time Operation
- 1MHz (max) Switching Frequency
- Idle-Mode Operation at Light Loads
- Thermal Shutdown
- Adjustable Soft-Start Inrush Current Limiting
- 100% Duty Cycle During Low-Dropout Operation
- Output Short-Circuit Protection
- 16-Pin QSOP Package
The MAX1742/MAX1842 constant-off-time, pulse-width- modulated (PWM) step-down DC-DC converters are ideal for use in 5V and 3.3V to low-voltage conversion necessary in notebook and subnotebook computers. These devices feature internal synchronous rectification for high efficiency and reduced component count. They require no external Schottky diode. The internal 90mΩ PMOS power switch and 70mΩ NMOS synchronous-rectifier switch easily deliver continuous load currents up to 1A. The MAX1742/MAX1842 produce a preset 2.5V, 1.8V, or 1.5V output voltage or an adjustable output from 1.1V to VIN. They achieve efficiencies as high as 95%.
The MAX1742/MAX1842 use a unique current-mode, constant-off-time, PWM control scheme, which includes Idle Mode™ to maintain high efficiency during light-load operation. The programmable constant-off-time architecture sets switching frequencies up to 1MHz, allowing the user to optimize performance trade-offs between efficiency, output switching noise, component size, and cost. Both devices are designed for continuous output currents up to 1A. The MAX1742 uses a peak current limit of 1.3A (min) and is suitable for applications requiring small external component size and high efficiency. The MAX1842 has a higher current limit of 3.1A (min) and is intended for applications requiring an occasional burst of output current up to 2.7A. Both devices also feature an adjustable soft-start to limit surge currents during startup, a 100% duty cycle mode for low-dropout operation, and a low-power shutdown mode that disconnects the input from the output and reduces supply current below 1µA. The MAX1742/MAX1842 are available in 16-pin QSOP packages.
For similar devices that provide continuous output currents up to 2A and 3A, refer to the MAX1644 and MAX1623 data sheets.
Applications
- 5V or 3.3V to Low-Voltage Conversion
- Chipset Supplies
- CPU I/O Ring
- Notebook and Subnotebook Computers
Documentation
Data Sheet 1
Technical Articles 2
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 |
|---|---|---|---|
| MAX1742EEE+ | QSOP | ||
| MAX1742EEE+T | QSOP |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareEvaluation Kits
Evaluation Kit for the MAX1742, MAX1842
Evaluation Kit for the MAX1742, MAX1842
Latest Discussions
No discussions on MAX1742 yet. Have something to say?
Start a Discussion on EngineerZone®