Diodes Incorporated AP61040/AP61041 Synchronous Buck Converters
Diodes Inc. AP61040/AP61041 Synchronous Buck Converters are low-current synchronous buck converters that provide high efficiency, excellent transient response, and high DC output accuracy. The ultra-low IQ of the AP61040/AP61041 makes them ideal for applications such as fitness wearables, health monitoring, BLUETOOTH®, and other handheld devices. The AP61040/AP61041 regulators are optimized to operate with 2.2µH and 10µF output capacitors. These devices provide an output current of at least 400mA and operate within an input voltage range of 2.15V to 5.5V.
The constant on-time control scheme handles wide input/output voltage ratios and provides a low external component count with outstanding performance in line/load transient responses. It also has seamless transitions between buck and 100% duty cycle modes. The AP61040 provides three programmable output voltages, selectable between 0.6V and 3.3V, via a single selection pin. The AP61041 provides two VSEL pins for programmable feedback voltages from 0.6V to 1.8V. The Diodes Inc. AP61040/AP61041 also features undervoltage lockout (UVLO), over-temperature protection (OTP), and overcurrent protection (OCP) to protect the circuit. Each device is available in a small 1.17mm x 0.77mm, 6-ball, WLCSP package.
Features
- AP61040
- 0.6V to 5.5V output voltage range
- 0.6V, 2.5V, and 3.3V selectable voltages
- 930nA quiescent current to maximize light-load efficiency
- Programmable operation mode through EN
- Pulse-width modulation regardless of output load
- AP61041
- Preselected output voltages for reduced component count
- 1.7µA (2.5µA max) IQ to maximize light-load efficiency
- Common features
- 2.15V to 5.5V VIN
- 400mA continuous output current, efficiency up to 95%
- 1.1MHz switching frequency
- Pulse-frequency modulation
- Fully protected for overcurrent, short circuit, over-temperature, and undervoltage lockout
- Lead-free and RoHS-compliant
- Halogen and antimony-free Green device
Applications
- Wearables
- Fitness trackers
- Smart watches
- Health monitors
- Bluetooth low-energy devices
- Ultra-low power applications
- Energy harvesting
Additional Resources
Block Diagrams
