Each channel of the LTC3634 uses internal switches with RDS(ON) of only 65mOhms and 130mOhms to deliver efficiencies as high as 95%. The two channels run 180 degrees out of phase, minimizing the size of both input and output capacitance. An on-chip buffer capable of driving a 10mA load provides a low noise reference output (VTTR) also at VDDQ/2. Additional features include power good voltage monitors, input overvoltage and overtemperature protection, and short circuit protection.
The LTC3634EUFD is available in a 4mm x 5mm QFN-28 whereas the LTC3634EFE is available in a 28-lead TSSOP package. Pricing starts at $4.25 and $4.40 each, respectively, in 1,000-piece quantities. Industrial grade versions, the LTC3634IUFD and LTC3634IFE, are guaranteed to operate over the -40°C to 125°C operating junction temperature range and are priced at $4.72 and $4.89 each, respectively, in 1,000-piece quantities. All versions are available from stock.
Summary of Features: LTC3634
• 3.6V to 15V Input Voltage Range
• VDDQ, VTT, VTTR Outputs
• Up to ±3A Output Current
• Up to 95% Efficiency
• Selectable 90°/180° Phase Shift Between Channels
• Adjustable Switching Frequency:
500kHz to 4MHz
• 10mA Buffered
VTTR = VDDQ/2 = VTT Reference
• ± 1.6% Accurate VTTR at 0.75V
• Optimal VOUT Range: 0.6V to 3V
• Current Mode Operation for Excellent Line & Load Transient Response
• External Clock Synchronization
• Short-Circuit Protected
• Input Overvoltage & Overtemperature Protection
• Power Good Status Outputs
• Available in (4mm x 5mm) QFN-28 &
Thermally Enhanced 28-Lead TSSOP Packages