| Vin (Min) (V) | 1.1 |
| Vin (Max) (V) | 10 |
| Vout (Min) (V) | 2.9 |
| Vout (Max) (V) | 30 |
| Switch current limit (Typ) (A) | 0.5 |
| Regulated outputs (#) | 1 |
| Switching frequency (Min) (kHz) | 500 |
| Switching frequency (Max) (kHz) | 1000 |
| Iq (Typ) (mA) | 0.8 |
| Features | Adjustable Current Limit |
| Duty cycle (Max) (%) | 70 |
| Rating | Catalog |
- Internal Series-Pass and Step-Up Switching
Regulator - Output Adjustable From 2.9 V to 30 V
- 1-V to 10-V Input for Switching Regulator
- 4.5-V to 32-V Input for Series Regulator
- Externally Controlled Switching Current
- No External Rectifier Required
The TL499A device is an integrated circuit designed to provide a wide range of adjustable regulated supply voltages. The regulated output voltage can be varied from 2.9 V to 30 V by adjusting two external resistors. When the TL499A is ac-coupled to line power through a step-down transformer, it operates as a series DC voltage regulator to maintain the regulated output voltage. With the addition of a battery from 1.1 V to 10 V, an inductor, a filter capacitor, and two resistors, the TL499A operates as a step-up switching regulator during an AC-line failure. The adjustable regulated output voltage makes the TL499A useful for a wide range of applications. Providing backup power during an AC-line failure makes the TL499A extremely useful in microprocessor memory applications. The TL499AC is characterized for operation from ?20°C to +85°C.
