PAM3103VOUTUBADJ

PAM3103 300mA Adjustable High PSRR CMOS Linear Regulator F eatures n Low Dropout Voltage: 180mV@ 300mA ( V O= 3.3V) n Accuracy within ±2% n Quiescent Current: 65 μ A Typ. n High PSRR: 67dB@100Hz n Excellent Line/Load Regulation n Fast Response n Current Limiting n Short Circuit Protection n Low Temperature Coefficient n Shutdown Current: 0.5 μ A n Thermal Shutdown n Space Saving Packages SOT2 3-5 and SC70-5 n Pb-Free Package General Description The PAM3103 is a positive, adjustable linear regulator. It features low quiescent current (65 μ A Typ.) and low dropout voltage, making it ideal for battery powered applications. The output voltage is adjustable from 1.2V through 5V. Its high PSRR makes it useful in applications that require AC noise suppression on the input power supply. Space-saving SOT23-5 and SC70-5 packages are attractive for portable and handheld applications. It has both thermal shutdown and a current limit features to prevent device failure under extreme operating conditions. It is stable with an output capacitor of 2.2 μ F or greater. Applications n n n n n n n Cordless Phone Cellular Phone Bluetooth Earphone Digital Camera Portable Electronics WLAN M P 3 Player Typical Application IN 1 5 Block Diagram VIN OUT VOUT VIN EN GND 2 VOUT PAM3103 3 ADJ 4 R1 CC 100pF OverCurrent Shutdown C IN 1μF R2 CO 2.2 μ F EN Thermal Protection ADJ Error Amp V O= V REF* ( R1 + R2 ) /R2 Reference GND Power Analog Microelectronics , Inc www.poweranalog.com 09/2008 Rev 1.2 1 PAM3103 300mA Adjustable High PSRR CMOS Linear Regulator P in Configuration & Marking Information Top View SOT23-5 5 4 5 4 Top View SC70-5 ACVYW 1 1 2 3 ACVYW 2 3 AC: V: Y: W: Product Code of PAM3101 Voltage Code Year Week Pin Number 1 2 3 4 5 Name VIN GND EN ADJ VOUT Function Input Ground Chip Enable (Active High) Adjustable Pin Output Absolute Maximum Ratings These are stress ratings only and functional operation is not implied . Exposure to absolute maximum ratings for prolonged time periods may affect device reliability . All voltages are with respect to ground . Input Voltage ............................................... 6.6V Output Current ......................................... 300mA Output Pin Voltage ................ GND-0.3 to V IN+0.3V Lead Soldering Temperature(5sec) ............ 300°C Storage Temperature ....................- 65 °C to 150 °C Recommended Operating Conditions Max. Supply Voltage (for Max. duration of 30 minutes)................................................6.4V Junction Temperature ..................- 40 °C to 125 °C Ambient Temperature .....................- 40 °C to 85 °C Thermal Information Parameter Thermal Resistance (Junction to Case) Thermal Resistance (Junction to Ambient) Internal Power Dissipation Symbol θJC θJA PD Package SOT23-5 SC70-5 SOT23-5 SC70-5 SOT23-5 SC70-5 Maximum 130 TBD 250 300 400 300 Unit °C/W °C/W mW Power Analog Microelectronics , Inc www.poweranalog.com 09/2008 Rev 1.2 2 PAM3103 300mA Adjustable High PSRR CMOS Linear Regulator E lectrical Characteristic PARAMETER Input Voltage Output Voltage Reference Voltage Output Voltage Accuracy Output Current Short Circuit Current Dropout Voltage Ground Current Quiescent Current Line Regulation Load Regulation Temperature Coefficient Over Temperature Shutdown Over Temperature Hysteresis Power Supply Ripple Rejection Output Noise EN Input High Threshold EN Input Low Threshold Shutdown Current T A= 25 °C, V IN= 4V, V O=3V, C IN= 1 μ F, C O= 2.2 μ F, unless otherwise noted. SYMBOL V IN VO VREF VO IO ISC Vdrop IGND IQ LNR LDR Tc OTS OTH IO=1mA IO=1mA f=100Hz PSRR Vn V IH V IL ISD Io=100mA, Vo=1.2V f =10Hz to 100kHz V IN =2.5V to 5V V IN =2.5V to 5V V EN=0V 0.01 1.5 0.3 1 f=1kHz f=10kHz Vo=0V IO =300mA 2.5V≤Vo 2.2μF with ESR>5mΩ ensures stability. ADJ Output Voltage Programming The output voltage of the PAM3103 adjustable regulator is programed by using an external resistor divider as shown in Figure1. The output voltage is calculated as below: V O=V REF(1+R1/R2) Input-Output (Dropout) Voltage Resistor R1 and R2 should be chosen for approximately 7 μ A divider current. Lower value resistors can be used but offer no advantage and waste more power. Higher value should be avoided as leakage current at ADJ pin increase the output voltage error. C C is unnecessary when R1 or R2