TL499A Wide-Range Power-Supply Controller |

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Wide-Range Power-Supply Controller



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.


  • Internal Series-Pass and Step-Up Switching
  • 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


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Part number Order Vin (Min) (V) Vin (Max) (V) Vout (Min) (V) Vout (Max) (V) Switch current limit (Typ) (A) Regulated outputs (#) Switching frequency (Min) (kHz) Switching frequency (Max) (kHz) Iq (Typ) (mA) Duty cycle (Max) (%) Operating temperature range (C) Type Rating Package Group
TL499A Order now 1.1     10     2.9     30     0.5     1     500     1000     0.8     70     -20 to 85     Converter     Catalog     PDIP | 8
SO | 8