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The AP61040 and AP61041 are low-

current, synchronous buck converters

providing high efficiency, excellent transient

responses, and high output accuracy.

Their ultra-low IQ make them ideal for

portable consumer applications such as

fitness wearables, health monitors, and

other handheld devices.

The AP61040 and AP61041 are optimized

to operate with a 2.2µH inductor and 10µF

input and output capacitors. The buck

converters provide a 400mA output current

across an input voltage range of 2.15V to

5.5V.

The constant on-time (COT) control scheme

handles wide input/output voltage ratios and

provides a low external component count

with an outstanding performance in line and

load transient responses. It also has

seamless transitions between buck and

100% duty cycle modes.

The AP61040 provides three programmable

output voltages between 0.6V to 3.3V,

selectable by one selection pin. The

AP61041 provides two VSEL pins for

programmable feedback voltages from 0.6V

to 3.3V. The devices also feature UVLO,

OCP, and OTP to protect the circuit.

The AP61040 and AP61041 are available in

the tiny, 1.17mm x 0.77mm, 6-ball

X1-WLB1208-6 package.

The Diodes logo is a registered trademark of Diodes

Incorporated in the United States and other countries.

All other trademarks are the property of their respective

owners.

© 2026 Copyright Diodes Incorporated. All Rights

Reserved.

Tiny, Ultra-Low IQ, 400mA COT, Synchronous Buck Converters

Increase Operating Battery Life in Portable Devices

AP61040

AP61041

Applications

▪ Wearables

▪ Fitness trackers

▪ Action cameras

▪ Smart glasses

▪ Smart watches

▪ Bluetooth low-energy devices

The DIODES Advantage

The AP61040 and AP61041 provide high-efficiency DC-DC

solutions to extend the battery life of portable consumer

applications.

▪ Low 930nA Quiescent Current, I

Q

Maximizes light-load efficiency

▪ Selectable Output Voltages

▪

AP61040 has a VSEL1 pin for programmable VOUT

(0.6V to 3.3V) with ±1%

▪

AP61041 has two VSEL1 and VSEL2 pins for programmable

VOUT (0.6V to 1.8V) with ±1

▪ Protection Functions

Provides overcurrent, short-circuit, overtemperature, and

undervoltage lockout protections

▪ High 1.1MHz Operating Frequency

Reduces the size and value of passive components

January 2026