150mA ADJUSTABLE VOLTAGE REGULATOR March 17, 1998 TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com DESCRIPTION The LP2951 series of low power voltage regulators have low quiescent current and low dropout voltage. The quiescent current increases minimally during dropout conditions thereby extending battery life. Available in the 8 lead SOIC package, the LP2951 series includes features such as shutdown and low output voltage detect (typically due to low battery conditions). This function may also be used as a power on reset function when triggered by CMOS or TTL inputs. The circuit can be used as a fixed voltage 5 volt (3.3 volt for LP2951CM-3.3) regulator or adjusted between 1.24 volts and 29 volts using external resistor pairs. BLOCK DIAGRAM LP2951 FEATURES •= Guaranteed 150mA current •= Adjustable output voltage - 1.24V to 29V •= Accurate 5V or 3.3V output @ 100mA •= Low dropout voltage - 350-400mV @ 100mA •= Regulator or reference functions •= Direct replacement for LP2951C, MIC2951-03, AS2951C APPLICATIONS •= Microcontroller supplies •= Linear regulators •= Adjustable Supplies •= Switching power supplies - post-regulation •= Portable modems •= Battery powered systems •= Cellular telephones •= Voltage references ORDERING INFORMATION (1)(2) DEVICE OUTPUT PACKAGE LP2951CM-X.X ADJ SO-8 Notes: (1) Where -X.X denotes voltage options. Available voltages are: 3.3V (-3.3) and 5V (leave blank). (2) Add suffix ‘TR’ for tape and reel. ABSOLUTE MAXIMUM RATINGS Parameter PIN CONFIGURATION Symbol Maximum Units VIN -0.3 to 30 V Shutdown Input Voltage -0.3 to 30 V Error Comp. Output Voltage -0.3 to 30 V PD Internally Limited W Thermal Resistance Junction to Ambient θJA 175 °C/W Operating Junction Temperature Range TJ -40 to 125 °C Storage Temperature Range TSTG -65 to 150 °C Lead Temperature (Soldering) 5 Sec TLEAD 260 °C Supply Voltage Power Dissipation 1 © 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 150mA ADJUSTABLE VOLTAGE REGULATOR LP2951 March 17, 1998 ELECTRICAL CHARACTERISTICS Unless specified, limits are over operating temperature range (TJ = TA), VIN = VOUT(NOM) + 1V, IL=100µA, CL=1µF Parameter Output Voltage LP2951CM Symbol Conditions Min Typ Max Units VOUT TJ = 25°C, IL = 100µA 4.950 5.000 5.050 V 3.267 3.300 3.333 LP2951CM-3.3 TC 0°C ≤ TJ ≤=70°C 20 120 ppm/°C Line Regulation REG(LINE) (VO(NOM) + 1V) ≤ VIN=≤=30V 0.1 0.5 % Load Regulation REG(LOAD) 100µA ≤ IL=≤=100mA 0.1 0.4 % Dropout Voltage VD IL===100µA 80 150 mV IL===100mA 380 600 IL===100µA 120 160 µA IL===100mA 8 14 mA IGND(D) VIN = (VO(NOM) - 0.5V), IL===100µA 110 250 µA ICL VOUT = 0 200 250 mA VREF VREF ≤ VOUT ≤ (VIN - 1V), TJ ==25°C, 100µA ≤ IL=≤=100mA 1.235 1.260 V 20 60 nA 2 µA 400 mV (1) Temp Coefficient Ground Current Dropout Ground Current Current Limit Reference Voltage Feedback Bias Current IGND 1.210 IFB Error Comparator Output High Leakage Current VOH = 30V Output Low Voltage VIN = (VO(NOM) - 0.5V), IOL = 400µA Threshold Voltage Upper 150 25 Lower 60 75 Hysteresis mV 140 15 mV Shutdown Input Input Logic Voltage VSD Low 0.6 High Input Current Regulator Shutdown Output Current ISD IO(SD) 2.0 V V VSHUTDOWN = 2.4V 100 VSHUTDOWN = 30V 750 VSHUTDOWN ≥ 2V, VIN ≤ 30V, VOUT = 0, Feedback pin to Tap 20 µA µA NOTE: (1) Temperature coefficient is defined as the worst case voltage change divided by total temperature range. 2 © 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 150mA ADJUSTABLE VOLTAGE REGULATOR LP2951 March 17, 1998 OUTLINE DRAWING SO-8 LAND PATTERN SO-8 3 © 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320