GOSEMICON GBI1A11

The GBI1A1x is a synchronous buck converter with an input voltage range of 6.5V–100V and an output current of 1A. The constant on-time (COT) control architecture delivers excellent load and line transient response. Additional features of the GBI1A1x include peak and valley overcurrent protection, integrated VCC bias supply and bootstrap diode, precision enable and input undervoltage lockout (UVLO), and thermal shutdown with auto-recovery. An open-drain power-good indicator supports sequencing, fault reporting, and output voltage monitoring. The GBI1A11 operates in PSM mode with a quiescent current as low as 30µA, achieving high light-load efficiency. The GBI1A10 operates in FPWM mode, suitable for isolated voltage output applications.

The GBI1A1x is an easy-to-use, high-efficiency synchronous buck converter with an input voltage range of 6.5V to 100V, capable of delivering up to 1A DC load current. Integrating both high-side and low-side power MOSFETs with a COT control architecture, this COT converter is well-suited for low-noise, high-current, and fast load transient requirements, operating with predictive on-time switching pulses.

The GBI1A1x implements an intelligent peak and valley current limit detection circuit to ensure reliable protection under output short-circuit conditions. The regulator requires no control loop compensation, reducing design time and external component count.

For the GBI1A11, under light-load conditions the device transitions to an ultra-low quiescent current mode to maintain high efficiency and prevent discharge of battery cells connected to the input during system standby. For the GBI1A10, under light-load conditions the device continues to operate in CCM mode, achieving lower output voltage ripple across the full load range.

The GBI1A1x integrates additional features to meet comprehensive system requirements, including an open-drain power-good circuit for power rail sequencing and fault reporting, internal fixed soft-start, monotonic startup into pre-biased loads, precision enable for programmable line UVLO, intelligent cycle-by-cycle current limiting for optimized inductor sizing, and thermal shutdown with auto-recovery. These features provide a flexible and easy-to-use platform for a wide range of applications.

The GBI1A1x is available in an 8-pin e-SOP package.

• Wide input range: 6.5V - 100V
• Constant on-time control mode
• 1A continuous output current
• 30uA ultra-low quiescent current (GBI1A11)
• Integrated 530mΩ high-side and 230mΩ low-side power MOSFETs
• 1.2V ± 1.0% feedback reference voltage
• Adjustable switching frequency 100kHz - 300kHz
• 3ms internal soft-start time and PG pin
• PSM mode at light load (GBI1A11)
• FPWM mode at light load (GBI1A10)
• Input UVLO, OT, and OCP protection
• Internal VCC bias regulator and bootstrap diode
• 4.9mm x 3.9mm eSOP-8L package

• Battery management systems (e-bikes, power tools)
• Telecom and automotive systems
• Motor drivers and drones
• General-purpose wide input voltage regulation