4A, 4MHz Monolithic Synchronous Step-Down DC/DC Converter
The LTC3614 is a low quiescent current monolithic synchronous buck regulator using a current mode, constant frequency architecture. The no-load DC supply current in sleep mode is only 75μA while maintaining the output voltage (Burst Mode operation) at no load, dropping to zero current in shutdown. The 2.25V to 5.5V input supply voltage range makes the LTC3614 ideally suited for single Li-Ion as well as fixed low voltage input applications. 100% duty cycle capability provides low dropout operation, extending the operating time in battery-powered systems.
The operating frequency is externally programmable up to 4MHz, allowing the use of small surface mount inductors. For switching-noise-sensitive applications, the LTC3614 can be synchronized to an external clock at up to 4MHz.
Forced continuous mode operation in the LTC3614 reduces noise and RF interference. Adjustable compensation allows the transient response to be optimized over a wide range of loads and output capacitors.
The internal synchronous switch increases efficiency and eliminates the need for an external catch diode, saving external components and board space. The LTC3614 is offered in a leadless 24-pin 3mm x 5mm thermally enhanced QFN package.
4A Output Current
2.25V to 5.5V Input Voltage Range
Low Output Ripple Burst Mode Operation: IQ = 75μA
±1% Output Voltage Accuracy
Output Voltage Down to 0.6V
High Efficiency: Up to 95%
Low Dropout Operation: 100% Duty Cycle
Programmable Slew Rate on SW Node Reduces Noise and EMI
Adjustable Switching Frequency: Up to 4MHz
Optional Active Voltage Positioning (AVP) with Internal Compensation
Selectable Pulse-Skipping/Forced Continuous/Burst Mode Operation with Adjustable Burst Clamp
Inputs for Start-Up Tracking or External Reference
DDR Memory Mode, IOUT = ±3A
Available in a 24-Pin 3mmx 5mm QFN Thermally Enhanced Package
Distributed Power Supplies
Portable Computer Systems
DDR Memory Termination