Overview
Features and Benefits
- Free-Running On-Demand PWM
- Selectable Light-Load Pulse-Skipping Operation
- ±1% Total DC Error in Forced-PWM Mode
- 5V to 20V Input Range
- Flexible Output Voltages
- OUT1: Dual Mode™ Fixed 2.5V or 1V to 5.5V Adjustable
- OUT2: Dual Mode Fixed 1.8V or 1V to 5.5V Adjustable
- Output Undervoltage Protection
- Complementary Synchronous Buck
- No Current-Sense Resistor
- 4.65V at 25mA Linear Regulator Output
- 4µA V+ Shutdown Supply Current
- 5µA VL Shutdown Supply Current
- 950µA Quiescent Supply Current
- Tiny 16-Pin QSOP Package
Product Details
The MAX1761 dual pulse-width-modulation (PWM), step-down controller provides high efficiency, excellent transient response, and high DC output accuracy in an extremely compact circuit topology. These features are essential for stepping down high-voltage batteries to generate low-voltage CPU core, I/O, and chipset RAM supplies in PC board area critical applications, such as notebook computers and smart phones.
Maxim's proprietary Quick-PWM™ quick-response, constant-on-time PWM control scheme handles wide input/output voltage ratios with ease and provides "instant-on" response to load transients while maintaining a relatively constant switching frequency.
The MAX1761 achieves high efficiency at reduced cost by eliminating the current-sense resistor found in traditional current-mode PWMs. Efficiency is further enhanced by its ability to drive large synchronous-rectifier MOSFETs. The MAX1761 employs a complementary MOSFET output stage, which reduces component count by eliminating external bootstrap capacitors and diodes.
Single-stage buck conversion allows this device to directly step down high-voltage batteries for the highest possible efficiency. Alternatively, two-stage conversion (stepping down the +5V system supply instead of the battery) at a higher switching frequency allows the minimum possible physical size.
The MAX1761 is intended for CPU core, chipset, DRAM, or other low-voltage supplies. The MAX1761 is available in a 16-pin QSOP package. For applications requiring greater output power, refer to the MAX1715 data sheet. For a single-output version, refer to the MAX1762/MAX1791 data sheet.
Applications
- 1.8V/2.5V Logic and I/O Supplies
- Digital Still Cameras
- Handy Terminals
- Notebooks and PDAs
- Smartphones
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
Product Recommendations
MAX1761 Companion Parts
Design Resources
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 Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| MAX1761EEE+ | Material Declaration | Reliability Data | 16-QSOP-150_MIL | |
| MAX1761EEE+T | Material Declaration | Reliability Data | 16-QSOP-150_MIL | |
| Wafer Fabrication Data |
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