MAX1945S
1MHz, 1% Accurate, 6A Internal Switch Step-Down Regulators
Show More
Smallest 6A, 1MHz, 1%-Accurate Internal Switch Step-Down DC-DC
Not the part you were looking for?
Ask a Question
Submit your question below and we will return the best answer from ADI’s knowledge database:
Search
Other places you can find help
Support
Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.
Visit the ADI Support Page
Features
- 6A PWM Step-Down Regulator with 95% Efficiency
- 1MHz/500kHz Switching for Small External Components
- 0.76in² Complete 6A Regulator Footprint
- External Components' Height <3mm
- ±1% Output Accuracy over Load and Line
- Operate from 2.6V to 5.5V Supply
- Operate from 2.5V Input with VCC at 3.3V/5V
- Preset Output Voltage of 1.8V or 2.5V
- Adjustable Output from 0.8V to 85% of Input
- Voltage Margining: ±4% (MAX1945R) or ±9% (MAX1945S)
- Synchronize to External Clock
- SYNCOUT Provides 180-Degree Out-of-Phase Clock Output
- All-Ceramic or Electrolytic Capacitor Designs
.svg?rev=fd385c90e2cf4716ae9a8c8d20e6b8e3&la=en&h=24&w=24&hash=A302DF48F94BAAA11877AF223F27157A){kind=icon}
The MAX1945R/MAX1945S high-efficiency pulse-width modulation (PWM) switching regulators deliver up to 6A of output current. The devices operate from an input supply range of 2.6V to 5.5V and provide selectable output voltages of 1.8V, 2.5V, and adjustable output voltages from 0.8V to 85% of the supply voltage. With VCC at 3.3V/5V, the input voltage can be as low as 2.25V. The MAX1945R/MAX1945S are ideal for on-board post-regulation applications. Total output voltage error is less than ±1% over load, line, and temperature.
The MAX1945R/MAX1945S operate at a selectable fixed frequency (500kHz or 1MHz) or can be synchronized to an external clock (400kHz to 1.2MHz). The high operating frequency minimizes the size of external components. The high bandwidth of the internal error amplifier provides excellent transient response. The MAX1945R/MAX1945S have internal dual N-channel MOSFETs to lower heat dissipation at heavy loads. Two MAX1945R/MAX1945Ss can operate 180 degrees out-of-phase of each other to minimize input capacitance. The devices provide output voltage margining for board-level testing. The MAX1945R provides a ±4% voltage margining. The MAX1945S provides a ±9% voltage margining.
The MAX1945R/MAX1945S are available in 28-pin TSSOP-EP packages and are specified over the -40°C to +85°C industrial temperature range. An evaluation kit is available to speed designs.
Applications
- ASIC/CPU/DSP Core Voltages
- Base Station-, Telecom-, and Networking-Equipment Power Supplies
- Low-Voltage, High-Density Distributed Power Supplies
- RAM Power Supply
- Server and Notebook Power Supplies
Ask a Question
Submit your question below and we will return the best answer from ADI’s knowledge database:
Search
Other places you can find help
Support
Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.
Visit the ADI Support Page
{{modalTitle}}
{{modalDescription}}
{{dropdownTitle}}
- {{defaultSelectedText}} {{#each projectNames}}
- {{name}} {{/each}} {{#if newProjectText}}
-
{{newProjectText}}
{{/if}}
{{newProjectTitle}}
{{projectNameErrorText}}
MAX1945S
Documentation
Filters
1 Applied
-
All
-
Data Sheet
-
All
-
English
-
Chinese
-
Japanese
Data Sheet
3
MAX1945R-MAX1945S: 1MHz, 1% Accurate, 6A Internal Switch Step-Down Regulators Data Sheet (Rev.1)
Documentation
Evaluation Kits 1
MAX1945EVKIT
Evaluation Kit for the MAX1945
Features and Benefits
- 0.970in x 0.840in Circuit Footprint
- 2.6V to 5.5V Input Range
- Output Voltage
- 1.8V/2.5V Preset
- 0.8V to 0.85 x VIN Adjustable
- Provides Up to 6A Output Current
- ±4% Voltage Margining
- Internal Power Switch and Synchronous Rectifier
- 500kHz/1MHz PWM Selectable Switching Frequency
- SYNC Input: Synchronizes from 400kHz to 1.2MHz TTL/CMOS Clock
- SYNC Output: Drives 2nd MAX1945 Switching 180 Degrees Out-of-Phase
- All Surface-Mount Components
- Fully Assembled and Tested
Product Detail
The MAX1945 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that contains a high-efficiency step-down switching-regulator circuit for applications requiring on-board postregulation. The circuit utilizes a MAX1945R regulator featuring ±4% voltage margining and is configured for a 1.8V output voltage. The circuit provides up to 6A of current. A 2.6V to 5.5V DC source can be utilized to power the circuit's input.
The MAX1945R IC features an internal power MOSFET switch and an internal synchronous rectifier. The MAX1945 EV kit provides connections for the SYNC input. It also provides an output to synchronize another MAX1945 EV kit clock 180 degrees out-of-phase. Pulse-width modulated (PWM) operation at 500kHz allows the use of tiny surface-mount components.
Applications
- ASIC/CPU/DSP Core Voltages
- Base Station, Telecom, and Networking
- Equipment Power Supplies
- Low-Voltage, High-Density Distributed Power
- RAM Power Supply
- Server and Notebook Power Supplies
- Supplies