The TPS51123 is a cost effective, dual-synchronous buck controller targeted for notebook system power supply solutions. It provides 5-V and 3.3-V LDOs and requires few external components. The TPS51123 supports high efficiency, fast transient responses and provides a combined power-good signal. Out-of-Audio mode light-load operation enables low acoustic noise at much higher efficiency than conventional forced PWM operation. Adaptive on-time D-CAP control provides convenient and efficient operation. The part operates with supply input voltages ranging from 5.5 V to 28 V and supports output voltages from 2 V to 5.5 V. The TPS51123 is available in a 24-pin QFN package and is specified from -40°C to 85°C ambient temperature range.
| Vin (min) (V) | 5.5 |
| Vin (max) (V) | 28 |
| Vout (min) (V) | 2 |
| Vout (max) (V) | 5.5 |
| Iout (max) (A) | 20 |
| Iq (typ) (mA) | 0.55 |
| Switching frequency (min) (kHz) | 200 |
| Switching frequency (max) (kHz) | 460 |
| Features | Enable, Light Load Efficiency, Power good, Synchronous Rectification |
| Operating temperature range (°C) | -40 to 85 |
| Regulated outputs (#) | 2 |
| Number of phases | 1 |
| Rating | Catalog |
| Control mode | D-CAP |
| Type | Controller |
| VQFN (RGE) | 24 | 16 mm² 4 x 4 |
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