Description

The AP61040 is a low-current synchronous buck converter providing high efficiency, excellent transient response, and high DC output accuracy. The ultra-low IQ of the AP61040 makes it ideal for applications such as fitness wearables, health monitoring, Bluetooth, and other handheld devices. The AP61040 regulator is optimized to operate with 2.2µH and 10µF output capacitors. The device provides at least 400mA output current and in an input voltage range of 2.15V to 5.5V.

The current control scheme handles wide input/output voltage ratios and provides a low external component count with outstanding performance in line/load transient response and seamless transition 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 device also features undervoltage lockout (UVLO), overtemperature protection (OTP), and overcurrent protection (OCP) to protect the circuit.

This IC is available in a small 1.17mm x 0.77mm, 6-ball, WLCSP package.

Feature(s)

VIN 2.15V to 5.5V
Output Voltage Range: 0.6V to 5.5V
- Three Selectable Voltages between 0.6V, 2.5V, and 3.3V
400mA Continuous Output Current, Efficiency up to 95%
930nA Quiescent Current to Maximize Light-Load Efficiency
1.1MHz Switching Frequency
Programmable Operation Mode through EN
- Pulse-Frequency Modulation
- Pulse-Width Modulation Regardless of Output Load
Fully Protected for Overcurrent, Short Circuit, Overtemperature, and Undervoltage Lockout
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/104/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. https://www.diodes.com/quality/product-definitions/

Application(s)

Wearables
Fitness trackers
Smart watches
Health monitors
Bluetooth low-energy devices
Ultra-low power applications
Energy harvesting

Specifications & Technical Documents

Product Parameters

Compliance (Only Automotive Supports PPAP)	Standard
Type	Buck
HS RDS(ON) (mΩ)	321
LS RDS(ON) (mΩ)	150
MaximumInput Voltage (V)	5.5
MinimumInput Voltage (V)	2.15
Quiescent Current Typ (μA)	0.93
Shutdown Current Typ (µA)	0.034
Output Current (A)	0.4 A
Minimum Output Voltage (V)	0.6
Maximum Output Voltage (V)	5.5
Frequency Typ (kHz)	1100
Features	Preselected Output Voltages for Reduced Component Count, 400mA Continuous Output Current, Efficiency Up to 95%, 1μA Quiescent Current to Maximize light Load Efficiency, 1.2MHz Switching Frequency, Programmable Operation Mode Through EN, Pulse-Frequency Mod

Technical Documents

Calculators

AP61040_AP61041-Power-Calculation.xlsx (346 KB)

Recommended Soldering Techniques

TN1.pdf

Purchase & Availability

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Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN #	Issue Date	Implementation Date	Subject
PCN-2770	2025-10-30	2025-10-30	Add Fab Site Code, Country of Diffusion (COD) and Assembly Site Origin (ASO) on Product and Shipping Labels for all Diodes Products

AP61040