Overview
The STBB3J, produced by STMicroelectronics, is a high-efficiency, fixed-frequency, dual-mode buck-boost DC-DC converter. This device is capable of providing output voltages ranging from 1.2 V to 5.5 V, with input voltages between 1.8 V and 5.5 V. It is particularly suitable for lithium-ion battery applications where the output voltage needs to be within the battery voltage range. The STBB3J integrates low-RDS(on) N-channel and P-channel MOSFET switches, contributing to its high efficiency. The device features a MODE pin that allows selection between auto mode and forced PWM mode, optimizing for either lower power consumption or best dynamic performance. Additional features include soft-start control, thermal shutdown, and current limit protection.
Key Specifications
| Parameter | Value |
|---|---|
| Input Voltage Range | 1.8 V to 5.5 V |
| Output Voltage Range | 1.2 V to 5.5 V |
| Output Current (Buck Mode) | 2 A at 3.3 V (VIN = 3.6 V to 5.5 V) |
| Output Current (Boost Mode) | 800 mA at 3.3 V (VIN = 2.0 V) |
| Typical Efficiency | Higher than 94% |
| DC Feedback Voltage Tolerance | ± 2% |
| Switching Frequency | 2.0 MHz (fixed), adjustable up to 2.4 MHz |
| Quiescent Current | |
| Shutdown Current | |
| Package | Flip Chip 20 bumps, 2.5 x 1.75 mm, pitch = 0.4 mm |
| Operating Temperature | -40°C to 125°C |
Key Features
- Automatic transition between step-down and boost mode
- Power save mode (PS) at light load for low power consumption
- Soft-start control and thermal shutdown
- Current limit protection
- Load disconnect during shutdown
- External synchronization capability
- Undervoltage lockout and short-circuit protection
- High-efficiency operation due to integrated low-RDS(on) MOSFET switches
Applications
The STBB3J is suitable for a variety of applications, including:
- Lithium-ion battery-powered devices where the output voltage needs to be within the battery voltage range
- Portable electronics requiring high efficiency and compact design
- Industrial equipment needing reliable and efficient power conversion
- Personal electronics such as smartphones, tablets, and wearables
Q & A
- What is the input voltage range of the STBB3J?
The input voltage range of the STBB3J is from 1.8 V to 5.5 V.
- What are the output current capabilities of the STBB3J in buck and boost modes?
The STBB3J can deliver up to 2 A at 3.3 V in buck mode (VIN = 3.6 V to 5.5 V) and up to 800 mA at 3.3 V in boost mode (VIN = 2.0 V).
- What is the typical efficiency of the STBB3J?
The typical efficiency of the STBB3J is higher than 94%.
- How does the MODE pin function in the STBB3J?
The MODE pin allows the selection between auto mode and forced PWM mode, enabling either lower power consumption or best dynamic performance.
- What protection features are included in the STBB3J?
The STBB3J includes soft-start control, thermal shutdown, current limit protection, undervoltage lockout, and short-circuit protection.
- What is the package type and dimensions of the STBB3J?
The STBB3J is packaged in a Flip Chip 20 bumps with dimensions of 2.5 x 1.75 mm and a pitch of 0.4 mm.
- Can the STBB3J be synchronized with an external clock signal?
Yes, the STBB3J can be synchronized with an external clock signal between 1.6 MHz and 2.4 MHz.
- What is the quiescent current of the STBB3J?
The quiescent current of the STBB3J is less than 50 μA.
- What is the shutdown current of the STBB3J?
The shutdown current of the STBB3J is less than 1 μA.
- What are some typical applications for the STBB3J?
The STBB3J is suitable for lithium-ion battery-powered devices, portable electronics, industrial equipment, and personal electronics such as smartphones and tablets.
