MAX1644
PRODUCTION2A, Low-Voltage, Step-Down Regulator with Synchronous Rectification and Internal Switches
Industry's Smallest 2A DC-DC with Synchronous Rectifier
- Part Models
- 2
- 1ku List Price
- Starting From $7.31
Overview
- ±1% Output Accuracy
- 95% Efficiency
- Internal PMOS and NMOS Switches
- 70mΩ On-Resistance at VIN = +4.5V
- 100mΩ On-Resistance at VIN = +3V
- Output Voltage
- +3.3V or +2.5V Pin-Selectable
- +1.1V to VIN Adjustable
- +3V to +5.5V Input Voltage Range
- 360µA (max) Operating Supply Current
- < 1µA Shutdown Supply Current
- Programmable Constant-Off-Time Operation
- 350kHz (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 SSOP Package
The MAX1644 constant-off-time, PWM step-down DC-DC converter is ideal for use in applications such as PC cards, CPU daughter cards, and desktop computer bus-termination boards. The device features internal synchronous rectification for high efficiency and reduced component count. It requires no external Schottky diode. The internal 0.10Ω PMOS power switch and 0.10Ω NMOS synchronous-rectifier switch easily deliver continuous load currents up to 2A. The MAX1644 produces a preset +3.3V or +2.5V output voltage or an adjustable output from +1.1V to VIN. It achieves efficiencies as high as 95%.
The MAX1644 uses a unique current-mode, constant-off-time, PWM control scheme, which includes an Idle Mode™ to maintain high efficiency during light-load operation. The programmable constant-off-time architecture sets switching frequencies up to 350kHz, allowing the user to optimize performance trade-offs between efficiency, output switching noise, component size, and cost. The device also features an adjustable soft-start to limit surge currents during start-up, 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 MAX1644 is available in a 16-pin SSOP package.
Applications
- +3.3V PC Card and CardBus Applications
- +5V to +3.3V/+2.5V Conversion
- CPU Daughter Card Supply
- CPU I/O Supplies
- Desktop Bus-Termination Boards
- Notebook and Subnotebook Computers
Documentation
Data Sheet 1
Technical Articles 3
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 |
|---|---|---|---|
| MAX1644EAE+ | 16-Lead SSOP (6.33mm x 5.38mm x 1.99mm) | ||
| MAX1644EAE+T | 16-Lead SSOP (6.33mm x 5.38mm x 1.99mm) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Apr 20, 2026 - 2571B PIN/ERRATA |
||
| MAX1644EAE+T | PRODUCTION | |
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/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Switching Regulators & Controllers 1 | ||
| MAX1623 | PRODUCTION | 3A, Low-Voltage, Step-Down Regulator with Synchronous Rectification and Internal Switches |
Evaluation Kits
Evaluation Kit for the MAX1644
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