Overview
The ST1PS01EJR is a nano-quiescent miniaturized synchronous step-down converter produced by STMicroelectronics. This device is designed to provide high efficiency and minimal quiescent current, making it ideal for applications where power consumption and PCB size are critical. The ST1PS01EJR operates with an input voltage range of 1.8 V to 5.5 V and can deliver up to 400 mA of output current. It features dynamic output voltage selection through two digital control inputs, allowing output voltages to be set between 0.625 V and 3.3 V.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Supply Voltage Range | 1.8 to 5.5 | V |
| Output Current Capability | Up to 400 | mA |
| Output Voltage Range | 0.625 to 3.3 | V |
| Output Voltage Accuracy | ±1.5% | |
| Quiescent Current (not switching) | 500 nA | |
| Typical Efficiency at 1 mA Load | 94% | % |
| Undervoltage Lockout (UVLO) Threshold | 1.57 V (typ.) | V |
| Operating Ambient Temperature | -40 to 85 | °C |
| Junction Temperature | -40 to 125 | °C |
| Thermal Resistance (Junction-Ambient) | 60 | °C/W |
Key Features
- Ultra-low quiescent current of 500 nA (typical) when not switching.
- High efficiency operation, with up to 94% efficiency at 1 mA load.
- Dynamic output voltage selection using two digital control inputs (D0, D1).
- Embedded soft-start circuit to minimize inrush current.
- Fast output discharge circuitry active when the enable pin is held to ground or when the input supply voltage reaches the minimum UVLO threshold.
- 100% duty cycle operation when the input voltage is close to the selected output voltage.
- Power Good open drain output to indicate when the output voltage reaches the correct level.
- Tiny external components required: 2.2 µH inductor and two small capacitors.
- Available in Flip-Chip package, suitable for space-constrained designs.
Applications
- Wearable applications such as smart watches, sport bands, and fitness accessories.
- Personal tracking monitors and energy harvesting devices.
- Wireless sensors and Bluetooth® low energy devices.
- Industrial sensors and portable low-power devices.
- Single cell Li-Ion battery applications.
- Zigbee and other low-power wireless communication devices.
Q & A
- What is the input voltage range of the ST1PS01EJR?
The input voltage range is from 1.8 V to 5.5 V.
- What is the maximum output current capability of the ST1PS01EJR?
The device can deliver up to 400 mA of output current.
- How is the output voltage selected on the ST1PS01EJR?
The output voltage is dynamically selected using two digital control inputs (D0, D1).
- What is the typical quiescent current of the ST1PS01EJR when not switching?
The typical quiescent current is 500 nA.
- What is the efficiency of the ST1PS01EJR at a 1 mA load?
The efficiency is up to 94% at a 1 mA load.
- Does the ST1PS01EJR have built-in protection features?
Yes, it includes undervoltage lockout (UVLO) protection and current limit on the high-side MOSFET.
- What is the purpose of the Power Good (PGOOD) output?
The Power Good output indicates when the output voltage reaches the correct level.
- What package type is the ST1PS01EJR available in?
The device is available in a Flip-Chip package.
- What are some typical applications for the ST1PS01EJR?
Typical applications include wearable devices, wireless sensors, and industrial sensors.
- How does the ST1PS01EJR handle start-up and inrush current?
The device embeds a fixed soft-start circuit to minimize inrush current during start-up.
