Texas Instruments TPS51116 DDR Switcher & LDO
Texas Instruments TPS51116 DDR Switcher and LDO provides a complete power supply for DDR/SSTL-2, DDR2/SSTL-18, and DDR3 memory systems. This TI device integrates a synchronous buck controller with a 3A sink/source tracking linear regulator and buffered low noise reference. TPS51116 offers the lowest total solution cost in systems where space is at a premium. TPS51116 synchronous controller runs fixed 400kHz pseudo-constant frequency PWM with an adaptive on-time control that can be configured in D-CAP Mode for ease of use and fastest transient response or in current mode to support ceramic output capacitors. The 3A sink/source LDO maintains fast transient response only requiring 20µF (2×10µF) of ceramic output capacitance.
Features
- Synchronous buck controller (VDDQ)
- 3.0V to 28V wide-input voltage range:
- D-CAP™ mode with 100ns load step response
- The current mode option supports ceramic output capacitors
- Supports soft-off in S4/S5 states
- Current sensing from RDS(on) or resistor
- 2.5V (DDR), 1.8V (DDR2), adjustable to 1.5V (DDR3) or output range 0.75V to 3.0V
- Equipped with Power Good, overvoltage protection, and undervoltage protection
- 3A LDO (VTT), buffered reference (VREF)
- Capable to sink and source 3A
- LDO input available to optimize power losses
- Requires only 20µF ceramic output capacitor
- Buffered low noise 10mA VREF output
- Accuracy ±20mV for both VREF and VTT
- Supports high-Z in S3 and soft-off in S4/S5
- Thermal shutdown
Applications
- DDR/DDR2/DDR3/LPDDR3 memory power supplies
- SSTL-2, SSTL-18, and HSTL termination
Publié le: 2019-10-21
| Mis à jour le: 2023-12-20