TI Memory Power Solution Synchronous Buck Controller
【產品特性】DDR2, DDR3 and DDR3L Memory Power Solution Synchronous Buck Controller
1. Supports DDR2 (1.8V), DDR3 (1.5V), DDR3L (1.35V) and DDR4 (1.2V)
2. PWM Conversion Voltage Range: 3 V to 28 V
3. D-CAP/ D-CAP2™ Control Mode
4. Selectable 300k/ 400kHz (D-CAP), 500k/ 670kHz (D-CAP2)
5. Auto-Skip Mode at Light loads
6. Supports Soft-Off in S4/S5 States
7. Full Protections
8. Latch-off (OVP/ UVP)
9. Non-Latch (UVLO/ OTP)
10. Cycle-by-cycle Valley OCL
11. VTT LDO 2-A (Peak) Sink and Source Current
12. 20-Pin, 3 mm × 3 mm, QFN Package
【文字介紹】The TPS51916 provides a complete power supply for DDR2, DDR3 and DDR3L memory systems in the lowest total cost and minimum space. It integrates a synchronous buck regulator controller (VDDQ) with a 2-A sink/source tracking LDO (VTT) and buffered low noise reference (VTTREF). The TPS51916 employs D-CAP™ mode coupled with 300 kHz/400 kHz frequencies for ease-of-use and fast transient response or D-CAP2™ mode coupled with higher 500 kHz/670 kHz frequencies to support ceramic output capacitor without an external compensation circuit. The VTTREF tracks VDDQ/2 within excellent 0.8% accuracy. The VTT, which provides 2-A sink/source peak current capabilities, requires only 10-μF of ceramic capacitance. In addition, a dedicated LDO supply input is available.
The TPS51916 provides rich useful functions as well as excellent power supply performance. It supports flexible power state control, placing VTT at high-Z in S3 and discharging VDDQ, VTT and VTTREF (soft-off) in S4/S5 state. Programmable OCL with low-side MOSFET RDS(on) sensing, OVP/UVP/UVLO and thermal shutdown protections are also available.