Features and Benefits
- High-Efficiency Step-Up Converter
- Up to 93% Efficiency
- Adjustable Output from +2.5V to +5.5V
- Up to 800mA Output
- PWM Synchronous-Rectified Topology
- 1MHz Operating Frequency (or Sync)
- LDO Linear Regulator
- 500mA LDO Linear Regulator
- 2.85V Linear Regulator Output or Adjustable (1.25V to 5V)
- Low 125mV Dropout at 500mA
- +0.7V to +5.5V Input Range
- 0.1µA Logic-Controlled Shutdown
- Adjustable Inductor Current Limit and Soft-Start
- Thermal Shutdown
- 1.5W, 16-Pin TSSOP-EP Package Available
The MAX1765 is a high-efficiency, low-noise, step-up DC-DC converter intended for use in battery-powered wireless applications. This device operates at a high 1MHz fixed frequency while maintaining an exceptionally low quiescent supply current (200µA). Its small external components and tiny package make this device an excellent choice for small hand-held applications that require the longest possible battery life.
The MAX1765 uses a synchronous-rectified pulse-width-modulation (PWM) boost topology to generate 2.5V to 5.5V outputs from a wide range of input sources, such as one to three alkaline or NiCd/NiMH cells or a single lithium-ion (Li+) cell. Maxim's proprietary architecture significantly improves efficiency at low load currents while automatically transitioning to fixed-frequency PWM operation at medium to high load currents to maintain excellent full-load efficiency. Forced-PWM mode is available for applications that require constant-frequency operation at all load currents, and the MAX1765 may also be synchronized to an external clock to protect sensitive frequency bands in communications equipment.
The MAX1765's low-dropout (LDO) linear regulator and DC-DC converter have separate shutdown control. The linear regulator's 250mΩ pass device maintains excellent dropout voltage at currents up to 500mA. The MAX1765 also features analog soft-start and current-limit functions to permit optimization of efficiency, external component size, and output voltage ripple.
The MAX1765 comes in a 16-pin QSOP package and a thermally enhanced 16-pin TSSOP-EP.
- Handheld Instruments (PDAs, Palmtops)
- Palmtop Computers
- PCS Phones
- Personal Communicators
- Portable Audio Players
- Wireless Handsets
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.
Evaluation Kits (1)
The MAX1765 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that contains two separate switching-regulator and linear-regulator circuits. Both circuits are configured for a +3.3V DC-DC output, which provides up to 800mA of current. They also contain a low-dropout (LDO) linear regulator that is configured for a +2.85V output and provides up to 500mA at the output. The two circuits differ only in their package type: the low-power circuit (left side) uses a 16-pin QSOP that can dissipate up to 696mW, while the high-power circuit (right side) uses a 16-pin TSSOP-EP that can dissipate up to 1700mW.
The MAX1765 features an internal N-channel MOSFET switch and a P-channel synchronous rectifier, and a pin-selectable forced pulse-width modulation (PWM) mode. The MAX1765 EV kit demonstrates low quiescent current and high efficiency (up to 96%) for maximum battery life. Operation at 1MHz allows the use of tiny surface-mount components.
- Cell Phones
Features & Benefits
- Operation from Inputs as Low as 0.7V
- Output Voltages
- +3.3V Output at 800mA (DC-DC)
- +2.85V Output at 500mA (LDO)
- Both Outputs Are Adjustable with External Resistors
- Two Complete Circuits (Both Package Types)
- 1µA IC Shutdown Current
- 1MHz PWM Switching Frequency (for Small, Surface-Mount Components)
- Programmable Operating Mode
- Built-In 500mA LDO Linear Regulator
- Fully Assembled and Tested
Documentation & Resources
MAX1765 Reliability Data1/12/2023
MAX1765 Companion Parts
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|
|MAX1765EEE+||Material Declaration||Reliability Data||16-QSOP-150_MIL|
|MAX1765EEE+T||Material Declaration||Reliability Data||16-QSOP-150_MIL|
|MAX1765EUE+||Material Declaration||Reliability Data||16-TSSOP_4.4_EP-4.4_MM|
|MAX1765EUE+T||Material Declaration||Reliability Data||16-TSSOP_4.4_EP-4.4_MM|
|Wafer Fabrication Data||MAX1765 Reliability Data|
Sample & Buy
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Buy Now Pricing
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