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 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

• 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

TL499A的完整型号有：TL499ACP、TL499ACPSR，以下是这些产品的关键参数及官网采购报价：

TL499ACP，工作温度：-20 to 85，封装：PDIP (P)-8，包装数量MPQ：50个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：NIPDAU，TI官网TL499ACP的批量USD价格：1.009（1000+）

TL499ACPSR，工作温度：-20 to 85，封装：SO (PS)-8，包装数量MPQ：2000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网TL499ACPSR的批量USD价格：.877（1000+）

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