MAX1515
Low-Voltage, Internal Switch, Step-Down/DDR Regulator
Low-Voltage, Internal-Switch, Step-Down/DDR Regulator Optimized for Use in Low-Voltage Active-Termination Power Rails or Chipset Power Supplies in Notebook and Subnotebook Computers
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Overview
Features and Benefits
- Dual 40mΩ Internal n-Channel MOSFETs
- Integrated Boost Switch
- +1.3V to +3.6V Input Voltage Range
- 1% VOUT Accuracy Over Line and Load
- 1MHz Maximum Switching Frequency
- DDR Termination Regulator (DDR Mode)
- Tracking Output Voltage
- Source/Sink Pulse Skipping
- ±5mA Reference Buffer
- Output Voltage (Non-DDR Mode)
- +2.5V, +1.8V, or +1.5V Pin Selectable
- +0.5V to +2.7V Adjustable
- 1.1V ±0.75% Reference Output
- Adjustable Soft-Start Inrush Current Limiting
- < 1µA (typ) Shutdown Supply Current
- < 800µA (max) Operating Supply Current
- Selectable Pulse-Skipping Operation at Light Loads
- Positive and Negative Current Limit
- Power-Good Window Comparator
- Output Short-Circuit Protection
Product Details
The MAX1515 constant-off-time, pulse-width-modulated (PWM) source/sink step-down DC-DC converter is optimized for use in low-voltage active-termination power rails or chipset power supplies in notebook and sub-notebook computers. This device features dual internal n-channel MOSFET power switches for high efficiency and reduced component count. External Schottky diodes are not required. An integrated boost switch eliminates the need for an external boost diode. The internal 40mΩ NMOS power switches easily source and sink continuous load currents up to 3A. The MAX1515 produces an adjustable output from +0.5V to +2.7V and achieves efficiencies as high as 95%.
The MAX1515 can be configured as a DDR regulator, producing an output that is exactly half the memory supply rail. The input of the power stage can be taken from the memory supply rail itself, resulting in an efficient power supply that returns the energy to the rail from which it was sourced. The MAX1515 includes a reference buffer that provides ±5mA of drive current.
The MAX1515 uses a unique current-mode, constant-off-time, PWM control scheme. A selectable pulse-skipping mode maintains high efficiency during light-load operation, yet still sources and sinks current on demand. The MAX1515 can also be operated in fixed-PWM mode for low output ripple. The programmable constant-off-time architecture sets switching frequencies up to 1MHz, which allows the user to optimize performance trade-offs between efficiency, output switching noise, component size, and cost. The MAX1515 features an adjustable soft-start to limit surge currents during startup and a low-power shutdown mode to disconnect the input from the output and reduce supply current below 1µA. The MAX1515 is available in a 24-pin thin QFN package with an exposed backside pad.
Applications
- Active Termination Buses
- Chipset/Graphics Processor Supplies
- Notebook DDR Memory Termination
Product Categories
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
MAX1515 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 |
|---|---|---|---|---|
| MAX1515ETG+ | Material Declaration | Reliability Data | 24-TQFN-4X4X0.75 | |
| MAX1515ETG+T | Material Declaration | Reliability Data | 24-TQFN-4X4X0.75 | |
| Wafer Fabrication Data |
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