EVALUATION KIT AVAILABLE Click here to ask about the production status of specific part numbers. MAX38640MAX38643 Tiny 1.8V to 5.5V Input, 330nA I , 700mA Q nanoPower Buck Converter General Description Benefits and Features The MAX38640MAX38643 are a nanoPower family of Extends Battery Life ultra-low 330nA quiescent current buck (step-down) DC- 330nA Ultra-Low Quiescent Supply Current DC converters that operate from 1.8V to 5.5V input volt- 5nA Shutdown Current age and support load currents of up to 175mA, 350mA, 96% Peak Efficiency and over 88% at 10A 700mA with peak efficiencies of 96%. While in shutdown, Easy to Use Addresses Popular Operation there is only 5nA of shutdown current. The devices offer 1.8V to 5.5V Input Range ultra-low quiescent current, small total solution size, and Single Resistor-Adjustable V from 0.7V to 3.3V OUT high efficiency throughout the load range. The (A-Option) MAX38640MAX38643 are ideal for battery applications Preprogrammed V from 0.5V to 5.0V (B-Option) OUT where long battery life is a must. 1.75% Output Voltage Accuracy The MAX38640MAX38643 family utilizes a unique con- Up to 175mA/350mA/700mA Load Current trol scheme that allows ultra-low quiescent current and Protects System in Multiple Use Cases high efficiency over a wide output current range. The Reverse-Current Blocking in Shutdown MAX38642 excludes active discharge resistor in shut- Optional Active Discharge Feature down, which allows the output to be regulated or held high Reduces Size and Increases Reliability by another source or by the charged output capacitor. -40C to +85C Temperature Range The MAX38640MAX38643 devices are offered in a 2mm x 2mm, 6-pin DFN Package space-saving 1.42mm x 0.89mm, 6-pin WLP (2x3 bump, 1.42mm x 0.89mm, 0.4mm Pitch 6-pin (2 x 3) WLP 0.4mm pitch), as well as a 2mm x 2mm, 6-pin DFN pack- age. All parts are specified over the -40C to +85C ex- Ordering Information appears at end of data sheet. tended temperature range. Typical Operating Circuit Applications Portable, Space-Constrained Consumer Products 2.2H Wearable Devices, Ultra-Low-Power IoT, NB IoT, and Bluetooth LE INPUT OUTPUT Single Li-ion (Li+) and Coin Cell Battery Products 1.8V TO 5.5V 1.8V LX Wired or Wireless Industrial Products OUT IN C COUT IN 22F 10F MAX38640AMAX38640A R SEL RSEL EN GND 768k Bluetooth is a registered trademark of Bluetooth SIG, Inc. 19-100410 Rev 6 8/21MAX38640MAX38643 Tiny 1.8V to 5.5V Input, 330nA I , 700mA Q nanoPower Buck Converter Absolute Maximum Ratings IN, EN, R , NC, OUT to GND ............................... -0.3V to +6V Continuous Power DissipationDFN (T = +70C) (Derate SEL A LX RMS Current WLP ............................. -1.6A to +1.6A 4.5mW/C above +70C) ...............................................357.8mW RMS RMS LX RMS Current DFN .................................. -1A to +1A Operating Temperature Range .............................-40C to +85C RMS RMS LX to GND (Note 1) ........................................-0.3V to V + 0.3V Maximum Junction Temperature ......................................+150C IN Continuous Power DissipationWLP (T = +70C) (Derate Storage Temperature Range ..............................-65C to +150C A 10.5mW/C above +70C) ................................................ 840mW Lead Temperature (soldering, 10 seconds) ......................+300C Soldering Temperature (reflow) ........................................+260C Note 1: LX pin has internal clamps to GND and IN. These diodes may be forward biased during switching transitions. During these transitions, the max LX current should be within the Max RMS Current rating for safe operation. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Package Information 6 DFN Package Code L622+1C Outline Number 21-0164 Land Pattern Number 90-0004 Thermal Resistance, Four-Layer Board: Junction to Ambient ( ) 223.6C/W JA Junction to Case ( ) 122C/W JC 6 WLP Package Code N60E1+2 Outline Number 21-100128 Land Pattern Number Refer to Application Note 1891 Thermal Resistance, Four-Layer Board: Junction to Ambient ( ) 95.15C/W JA For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a +, , or - in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/ thermal-tutorial. www.maximintegrated.com Maxim Integrated 2