Image shown is for reference only. Actual package may vary. Refer to the product data sheet for package details. W-QFN1520-8/SWP (Type UX)

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AP61406

2.3V TO 5.5V Input, 4A Synchronous Buck Converter with I2C

Datasheet

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Description

The AP61406 is a selectable up to 4A, synchronous buck converter with an input voltage range of 2.3V to 5.5V and fully integrates a 75mΩ high-side power MOSFET and a 33mΩ low-side power MOSFET to provide high-efficiency step-down DC/DC conversion.

The AP61406 is easily used by minimizing the external component count due to its adoption of constant on-time (COT) control to achieve fast transient responses, ease loop stabilization, and low output voltage ripple.

The AP61406 has optimized designs for small form factor. The series offers various fixed output voltage and an adjustable output voltage version. It also has a proprietary gate driver scheme to resist switching node ringing without sacrificing MOSFET turn-on and turn-off times, which reduces high-frequency radiated EMI noise caused by MOSFET switching.

The AP61406 features I2C compatible, 2-wires serial interface consisting of a bi-directional serial-data line, SDA, and a serial-clock line, SCL. It supports SCL clock rates up to 3.4MHz.

The device is available in a W-QFN1520-8/SWP (Type UX) package.

Feature(s)

VIN 2.3V to 5.5V
Wide Output Voltage Range: 0.300V to 3.600V
0.5V ± 2% Reference Voltage (Default Setting)
20µA Ultra-Low Quiescent Current (Pulse-Frequency Modulation)
I2C Interface up to 3.4MHz SCL Clock Rates
- Programmable Mode – PFM/PWM
- Programmable Frequency – 1MHz, 1.5MHz, 2MHz, 2.5MHz
- Programmable IOUT – 1A/2A/3A/4A
- 20mV Increment VOUT Adjust
Power-Good Indicator
Protection Circuitry
- Undervoltage Lockout (UVLO)
- VIN Overvoltage Protection (OVP)
- Peak and Valley Current Limit
- Thermal Shutdown
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)

General-purpose POL supplies
Network video cameras
Wireless routers
Hard disk drivers
LVDDR5

Specifications & Technical Documents

Product Parameters

Compliance (Only Automotive Supports PPAP)	Standard
Type	Buck
HS RDS(ON) (mΩ)	75
LS RDS(ON) (mΩ)	33
MaximumInput Voltage (V)	5.5
MinimumInput Voltage (V)	2.3
Quiescent Current Typ (μA)	20
Shutdown Current Typ (µA)	0.02
Output Current (A)	4 A
Minimum Output Voltage (V)	0.3
Maximum Output Voltage (V)	3.6
Frequency Typ (kHz)	1000/1500 /2000/2500
Features	EnableLight Load Efficiency EN pin to set up PFM or Force PWM Power-Good Output DischargeSoft-start.I2C Interface up to 3.4MHz SCL clock rates, Programmable MODE – PFM/PWM, Programmable Frequency - 1MHz,1.5MHz, 2MHz,2.5MHz, Programmable Iout – 1A/2A/3A/4A,

Technical Documents

Calculators

AP61402_Q_AP61406_Q_Power-Calculator_Design.xlsx (374 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