The TPS51117 device is a cost-effective, synchronous buck controller for POL voltage regulation in notebook PC applications. The controller is dedicated for the operation of the Adaptive On-Time D-CAP mode. This mode provides ease-of-use, low external component count, and fast transient response. Auto-skip mode for high efficiency down to the milliampere load range, or PWM-only mode for low-noise operation is selectable.
The current-sensing scheme for positive overcurrent and negative overcurrent protection is loss-less low-side RDS(on) sensing plus temperature compensation. The device receives a 5-V (4.5 V to 5.5 V) supply from another regulator such as the TPS51120 or TPS51020. The conversion input can be either VBAT or a 5-V rail, ranging from 1.8 V to 28 V, and the output voltage range is from 0.75 V to 5.5 V.
The TPS51117 is available in a 14-pin VQFN or a 14-pin TSSOP package and is specified from –40°C to 85°C.
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| Vin (min) (V) | 1.8 |
| Vin (max) (V) | 28 |
| Vout (min) (V) | 0.76 |
| Vout (max) (V) | 5.5 |
| Iout (max) (A) | 10 |
| Iq (typ) (mA) | 0.4 |
| Switching frequency (min) (kHz) | 100 |
| Switching frequency (max) (kHz) | 550 |
| Features | Enable, Power good, Pre-Bias Start-Up, Synchronous Rectification |
| Operating temperature range (°C) | -40 to 85 |
| Regulated outputs (#) | 1 |
| Number of phases | 1 |
| Rating | Catalog |
| Control mode | D-CAP |
| Type | Controller |
| TSSOP (PW) | 14 | 32 mm² 5 x 6.4 |
| VQFN (RGY) | 14 | 12.25 mm² 3.5 x 3.5 |
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