AP1122T

AP1122 1A Low Dropout Positive Regulator Features - 1.3V maximum dropout at full load current - Fixed 1.2V+ 2% output voltage - Fast transient response - Output current limiting - Built-in thermal shutdown - Good noise rejection - Pb-Free Packages: SOT223, TO263, TO252, TO220, SOT89 General Description AP1122 is a low dropout positive fixed-mode regulator with minimum of 1A output current capability. The product is specifically designed to provide well-regulated supply for low voltage IC applications such as high-speed bus termination and low current 1.2V logic supply. AP1122 is also well suited for other applications such as VGA cards. AP1122 is guaranteed to have lower than 1.3V dropout at full load current making it ideal to provide well-regulated outputs of 1.2 output voltage with 2.5V input voltage supply. Applications - PC peripheral - Communication Ordering Information AP 1122 X X Low Dropout Regulator Package E : SOT223-3L K : TO263-3L D : TO252-3L T : TO220-3L Y : SOT89-3L Packing Blank : Tube A : Taping Typical Circuit 2.5V C1 100uF Vin Vout GND Tab is Vout C2 100uF 1.2V/1A This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product. Rev.1.0 Oct 21, 2004 1/10 AP1122 1A Low Dropout Positive Regulator Connection Diagram 3 PIN SOT223 ( Top View ) 3 2 1 Tab is Vout Vin Vout GND 1 Tab is Vout 3 PIN SOT89 3 PIN TO220 GND 3 PIN TO252 / TO263 ( Top View ) 3 2 Vin Vout 3 2 1 Tab is Vout Vin Vout GND 3 2 1 Tab is Vout Vin Vout GND Block Diagram Vin 3 2 Vout + + CURRENT LIMIT 1.2V + + Thermal Shutdown 1 GND Anachip Corp. www.anachip.com.tw 2/10 Rev.1.0 Oct 21, 2004 AP1122 1A Low Dropout Positive Regulator Pin Descriptions NAME GND Vout I/O I O PIN # 1 2 FUNCTION Ground Pin The output of the regulator. A minimum of 10uF capacitor (0.15Ω ≤ ESR ≤ 20Ω) must be connected from this pin to ground to insure stability. The input pin of regulator. Typically a large storage capacitor (0.15Ω ≤ ESR ≤ 20Ω) is connected from this pin to ground to insure that the input voltage does not sag below the minimum dropout voltage during the load transient response. This pin must always be 1.3V higher than Vout in order for the device to regulate properly. Vin I 3 Absolute Maximum Ratings Symbol Vin PD TST TOP Parameter DC Supply Voltage Power Dissipation Storage Temperature Operating Junction Temperature Range Rating Unit -0.3 to 12 V Internally Limited o -65 to +150 C o 0 to +150 C Electrical Characteristics (Under Operating Conditions) PARAMETER Output Voltage Line Regulation Load Regulation Dropout Voltage (VIN-VOUT) Current Limit Minimum Load Current Thermal Regulation CONDITIONS 2.5V≦VIN≦12V, TJ=25oC o IO=10mA, 2.5V