AP1187S7

AP1187 1A Ultra Low Dropout Positive Adjustable Regulator Features • • • • • • • General Description AP1187 is a 1A regulator with extremely low dropout voltage. This product is specifically designed to provide well regulated supply for applications requiring 2.8V or lower voltages from 3.3V ATX power supplies where high efficiency of a switcher can be achieved without the cost and complexity associated with switching regulator. One such application is the new graphic chip sets that require anywhere from 2.4V to 2.7V supply. Adjustable output voltage 0.6V Maximum Dropout voltage at 1.0A Load current Built-in Thermal Shutdown Output Current Limiting Fast transient response Good noise rejection Package: SOP-7L Applications • • • • • • • • PC Motherboard LCD Monitor Graphic Card DVD-Video Player NIC/Switch Telecom Equipment ADSL Modem Printer and other Peripheral Equipment Pin Assignments Pin Descriptions Name ADJ Description A resistor divider from this pin to the VOUT pin and ground sets the output voltage. This pin is the positive side of the reference that allows remote load sensing to achieve excellent load regulation. A minimum of 10uF capacitor must be connected from this pin to ground to insure stability. The input of the regulator. This pin is the supply pin for the internal control circuit as well as the base drive for the pass transistor. Not used. The output of the regulator. ( Top View ) ADJ 1 VSENSE 2 AP1187 VIN 3 VCTRL 4 SOP-7L 7 NC 6 VOUT VSENSE 5 VIN VIN VCTRL NC VOUT 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.1.1 1/6 Aug 23, 2005 AP1187 1A Ultra Low Dropout Positive Adjustable Regulator Ordering Information AP 1187 X Low Dropout Regulator Package S7:SOP-7L X X Lead Free Packing Blank : Tube A : Taping& Reel Blank : Normal L : Lead Free Package Block Diagram VIN VCTRL + + Current Limit Thermal Shutdown 1.25V + ADJ + VOUT VSENSE Absolute Maximum Ratings (Note 1) Symbol VIN VCTRL PD TST TOP Input Voltage Control Input Voltage Power Dissipation Storage Temperature Operating Junction Temperature Range Parameter Rating 16 18 Internally limited -65 to +150 0 to +150 oC oC Unit V V NOTE1: AP1187-ADJ incorporates an internal thermal shutdown that protects the device when the junction temperature exceeds the allowable maximum junction temperature. Anachip Corp. www.anachip.com.tw 2/6 Rev.1.1 Aug 23, 2005 AP1187 1A Ultra Low Dropout Positive Adjustable Regulator Electrical Characteristics Unless otherwise specified, these specifications apply over, CIN=1uF, COUT=10uF, and TJ=0 to 150 C. Typical value refer to TJ=25 C. VOUT = VSENSE. o o Sym. Parameter o Test Condition Min. Typ. Max. Unit 1.225 1.250 1.275 0.2 1 1.5 0.5 1.1 5 0.01 60 70 6 50 20 1 2 10 120 O VREF Reference Voltage TJ=25 C,(VIN-VOUT)=0.5V, IO=10mA VCTRL =VIN+1V Line Regulation IO=10mA, VOUT+0.5V