Linear Technology Corporation introduces the LTC3865/-1, a dual-output synchronous step-down DC/DC controller with 95% efficiency. The device features a two-pin selectable VOUT setting, which saves 4 Precision feedback resistors. The output voltage maintains a tight ±1% accuracy, including the initial set point, an operating temperature range of -40°C to 125°C, and load/voltage regulation. 9 output voltages from 0.6V to 5V can be selected. The 4.5V to 38V input voltage range covers a wide range of applications, including most intermediate bus voltages and battery chemistries. A powerful built-in N-channel MOSFET driver allows the use of high-power external MOSFETs to generate up to 20A of output current. Applications include point-of-load regulators in medical, industrial, automotive, datacom, telecommunications, and multifunction printers.
The constant frequency current mode architecture allows for the selection of fixed or phase-lockable (PLL) switching frequencies from 250kHz to 770kHz. Minimize power loss and power supply noise by operating the stages at 180o. OPTI-LOOP® compensation reduces transient response and can be optimized over a wide range of output capacitors and ESR values, including all ceramic input and output capacitors. Output current sensing is accomplished by measuring the voltage drop across the output inductor (DCR) for maximum efficiency or by using an optional sense resistor. In the event of a short circuit, current foldback limits the heat of the MOSFET. In addition, the LTC3865/-1 features adjustable soft-start or tracking to control the output voltage startup characteristics. The LTC3865/-1 offers up to 99% duty cycle with very low dropout voltage, which is a very useful feature for extended runtime in battery-powered applications.
The LTC3865/-1 is available in thermally enhanced 5mm x 5mm QFN-12 and SSOP-38 packages. It is available in 1,000-piece quantities and is priced at $2.65 each.
Performance Summary: LTC3865/-1
Two pin selectable (9 set values) Output voltage setting, selection range from 0.6V to 5.0V
Saves 4 precision feedback resistors for synchronous rectification for up to 95% efficiency 4.5V to 38V wide input voltage range with ±1% total DC output voltage accuracy over the -40°C to +125°C temperature range Output, 180? Inverting Controller Reduces Noise and Input Capacitance DCR or RSENSE Current Sensing Options Powerful Built-in N-Channel MOSFET Driver 250kHz to 770kHz Phase-Lockable Fixed Operating Frequency Programmable Soft-Start or Tracking Adjustable Current-Limited Current Mode Control Power good signal
The constant frequency current mode architecture allows for the selection of fixed or phase-lockable (PLL) switching frequencies from 250kHz to 770kHz. Minimize power loss and power supply noise by operating the stages at 180o. OPTI-LOOP® compensation reduces transient response and can be optimized over a wide range of output capacitors and ESR values, including all ceramic input and output capacitors. Output current sensing is accomplished by measuring the voltage drop across the output inductor (DCR) for maximum efficiency or by using an optional sense resistor. In the event of a short circuit, current foldback limits the heat of the MOSFET. In addition, the LTC3865/-1 features adjustable soft-start or tracking to control the output voltage startup characteristics. The LTC3865/-1 offers up to 99% duty cycle with very low dropout voltage, which is a very useful feature for extended runtime in battery-powered applications.
The LTC3865/-1 is available in thermally enhanced 5mm x 5mm QFN-12 and SSOP-38 packages. It is available in 1,000-piece quantities and is priced at $2.65 each.
Performance Summary: LTC3865/-1
Two pin selectable (9 set values) Output voltage setting, selection range from 0.6V to 5.0V
Saves 4 precision feedback resistors for synchronous rectification for up to 95% efficiency 4.5V to 38V wide input voltage range with ±1% total DC output voltage accuracy over the -40°C to +125°C temperature range Output, 180? Inverting Controller Reduces Noise and Input Capacitance DCR or RSENSE Current Sensing Options Powerful Built-in N-Channel MOSFET Driver 250kHz to 770kHz Phase-Lockable Fixed Operating Frequency Programmable Soft-Start or Tracking Adjustable Current-Limited Current Mode Control Power good signal
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