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The MAX8643A high-efficiency switching regulator delivers up to 3A load current at output voltages from 0.6V to (0.9 x VIN).The IC operates from 2.35V to 3.6V, making it ideal for on-board point-of-load and postregulation applications. Total output error is less than ±1% over load, line, and temperature.
The MAX8643A features fixed-frequency PWM mode operation with a switching frequency range of 500kHz to 2MHz set by an external resistor. High-frequency
operation allows for an all-ceramic capacitor design. The high operating frequency also allows for small-size external components.
The low-resistance on-chip nMOS switches ensure high efficiency at heavy loads while minimizing critical inductances, making the layout a much simpler task with respect to discrete solutions. Following a simple layout and footprint ensures first-pass success in new designs.
The MAX8643A comes with a high-bandwidth (> 14MHz) voltage-error amplifier. The voltage-mode control architecture and the voltage-error amplifier permit a type III compensation scheme to be utilized to achieve maximum loop bandwidth, up to 20% of the switching frequency. High loop bandwidth provides fast transient
response, resulting in less required output capacitance and allowing for all-ceramic capacitor designs.
The MAX8643A provides two tri-state logic inputs to select one of nine preset output voltages. The preset output voltages allow customers to achieve ±1% output-voltage accuracy without using expensive 0.1% resistors. In addition, the output voltage can be set to any customer value by either using two external resistors at the feedback with 0.6V internal reference or applying an external reference voltage to the REFIN input. The MAX8643A offers programmable soft-start time using one capacitor to reduce input inrush current.
The MAX8643A is available in a lead-free, 24-pin, 4mm x 4mm thin QFN package.
For assistance with selecting appropriate capacitors, resistors, and inductors, try our online component selection spreadsheet.
Key Features
Applications/Uses
Internal 37mΩ RDSON MOSFETs
Continuous 3A Output Current
±1% Output Accuracy Over Load, Line, and Temperature
Operates from 2.35V to 3.6V Supply
Adjustable Output from 0.6V to (0.9 x VIN)
Soft-Start Reduces Inrush Supply Current
500kHz to 2MHz Adjustable Switching Frequency
Compatible with Ceramic, Polymer, and Electrolytic Output Capacitors
VID-Selectable Output Voltages
0.6, 0.7, 0.8, 1.0, 1.2, 1.5, 1.8, 2.0, and 2.5V
Fully Protected Against Overcurrent and Overtemperature
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices:
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MAX8643A
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Status
Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
Temp
RoHS/Lead-Free? Materials Analysis
MAX8643AETG/V+T
Active
Land Pattern: Not Available
-40°C to +85°C
See data sheet
MAX8643AETG+
Active
TQFN;24 pin;17 mm²
Outline Drawing: 21-0139 (PDF)
Land Pattern: 90-0022 (PDF)
Use pkgcode/variation: T2444+4*
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