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MAX38640–MAX38643
Tiny 1.8V to 5.5V Input, 330nA I , 700mA
Q
nanoPower Buck Converter
General Description
Benefits and Features
The MAX38640–MAX38643 are a nanoPower family of
ultra-low 330nA quiescent current buck (step-down) DC-
DC converters that operate from 1.8V to 5.5V input volt-
age and support load currents of up to 175mA, 350mA,
700mA with peak efficiencies of 96%. While in shutdown,
there is only 5nA of shutdown current. The devices offer
ultra-low quiescent current, small total solution size, and
high efficiency throughout the load range. The
MAX38640–MAX38643 are ideal for battery applications
where long battery life is a must.
● Extends Battery Life
• 330nA Ultra-Low Quiescent Supply Current
• 5nA Shutdown Current
• 96% Peak Efficiency and over 88% at 10µA
● Easy to Use – Addresses Popular Operation
• 1.8V to 5.5V Input Range
• Single Resistor-Adjustable V
(A-Option)
• Preprogrammed V
from 0.7V to 3.3V
OUT
from 0.5V to 5.0V (B-Option)
OUT
• ±1.75% Output Voltage Accuracy
The MAX38640–MAX38643 family utilizes a unique con-
trol scheme that allows ultra-low quiescent current and
high efficiency over a wide output current range. The
MAX38642 excludes active discharge resistor in shut-
down, which allows the output to be regulated or held high
by another source or by the charged output capacitor.
• Up to 175mA/350mA/700mA Load Current
● Protects System in Multiple Use Cases
• Reverse-Current Blocking in Shutdown
• Optional Active Discharge Feature
● Reduces Size and Increases Reliability
• -40°C to +85°C Temperature Range
The MAX38640–MAX38643 devices are offered in a
space-saving 1.42mm x 0.89mm, 6-pin WLP (2x3 bump,
0.4mm pitch), as well as a 2mm x 2mm, 6-pin µDFN pack-
age. All parts are specified over the -40°C to +85°C ex-
tended temperature range.
• 2mm x 2mm, 6-pin µDFN Package
• 1.42mm x 0.89mm, 0.4mm Pitch 6-pin (2 x 3) WLP
Typical Operating Circuit
Applications
2.2µH
● Portable, Space-Constrained Consumer Products
INPUT
1.8V TO 5.5V
OUTPUT
1.8V
● Wearable Devices, Ultra-Low-Power IoT, NB IoT, and
®
Bluetooth LE
LX
IN
OUT
● Single Li-ion (Li+) and Coin Cell Battery Products
● Wired or Wireless Industrial Products
C
22µF
C
10µF
OUT
IN
MAX38640A
R
SEL
R
SEL
EN
GND
768kΩ
Bluetooth is a registered trademark of Bluetooth SIG, Inc.
19-100410; Rev 10; 1/23
Ordering Information appears at end of data sheet.
© 2023 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners.
One Analog Way, Wilmington, MA 01887 U.S.A. | Tel: 781.329.4700 | © 2023 Analog Devices, Inc. All rights reserved.
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