LN2266PB2MR-G

LN2266 Super-Small Package PWM Control Step-up Switching Regulator ■ General Description The LN2266  is a compact, high efficiency, and High supply capability to deliver 3.3V 300mA with1 alkaline cell or deliver 5V 1100mA with 1 Li-ion Cell low voltage step-up DC/DC converter with an Adaptive Current Mode PWM control loop, includes an error amplifier, ramp generator, comparator, switch pass element and  17µA quiescent (switch-off) supply current  0.01µA shutdown mode supply current  Providing flexibility for using internal and external power switches driver in which providing a stable and high efficient  operation over a wide range of load currents. It operates in Output voltage: settable to between 2.0V to 6.0V ,accuracy of 2% stable waveforms without external compensation. ■ Applications The low start-up input voltage below 0.9V makes LN2266 suitable for 1 to 4 battery cells applications of providing up to 1100mA output current. Besides, the 17µA low quiescent current together with high efficiency maintains long battery lifetime. The output voltage is set with two external resistors. Both internal 2.5A switch and driver for driving external power devices (NMOS or NPN) are provided. ■ Features  MP3  PDA  DSC  LCD panel  RF-Tags  Portable  Wireless equipment instrument ■ Package  0.9V（Iout=1mA） Low start-up input voltage  1000kHz fixed switching frequency  90% efficiency  SOT-23-6L  SOT-89-5L ■ Ordering Information LN2266P①②③④ Designator ① ② Symbol Description Designator Symbol Description M SOT-23-6L SOT-89-5L A CE with EXT B CE without EXT P 1 Reference accuracy:±1% R Embossed Tape :Standard Feed 2 Reference accuracy:±2% L Embossed Tape : Reverse Feed 4 Reference accuracy:±4% ③ ④ ■ Pin Configuration Rev.1.0 — Dec. 20, 2011 1 www.natlinear.com LN2266 ■ Pin Assignment Pin Mumber Pin Name Function SOT-23-6 SOT-89-5 1 1 CE Chip enable 2 - NC Floating or connected to GND 3 5 GND 4 4 LX 5 2 VDD 6 3 FB Ground Pin for switching Input positive power pin of LN2266 Feedback input pin ■ Marking Rule  1 2 3 SOT-23-6L, SOT-89-5L Represents the product name Symbol Product Name A LN2266P**** Represents the type of regulator Symbol A B Type CE with EXT CE without EXT Represents the accuracy of reference voltage Symbol Reference Accuracy 1 1% 2 2% 4 4% ④ Represents the assembly lot No. 0-9，A-Z; 0-9，A-Z mirror writing，repeated（G，I，J，O，Q，W exception） Rev.1.0 — Dec. 20, 2011 2 www.natlinear.com LN2266 ■ Function Block Diagram ■ Absolute Maximum Ratings Parameter Input voltage Output voltage LX pin Switch Current Power dissipation PD Symbol Maximum Rating VDD Vss-0.3～Vss+7 VOUT Vss-0.3～Vss+7 VLX Vss-0.3～Vss+7 ILX 2.5 SOT-23-6 150 SOT-89-5 500 Operating ambient temperature Topr -40～＋80 Storage ambient temperature Tstg -40～＋125 Unit V A mW ℃ Caution : The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any conditions. Rev.1.0 — Dec. 20, 2011 3 www.natlinear.com LN2266 ■ Typical Application Circuit Circuit 1. LN2266 Typical Application for Portable Instruments Circuit 2. LN2266 for multi-output Application Rev.1.0 — Dec. 20, 2011 4 www.natlinear.com LN2266 ■ Electrical Characteristics (VIN=1.5V,VDD=3.3V,ILoad =0,Ta=25℃, unless otherwise noted) Item Symbol Condition Min. Typ. Max. 0.9 1.00 Unit Operation start voltage VST IOUT=1mA - VDD supply voltage VDD VDD pin voltage 2 Shut down current IOFF CE=0,VIN=4.5V － 0.01 1 µA Switch-off Current Iswitch-off VIN=6V － 17 25 µA 6 V Continuous Switching Current Iswitch VIN=CE=3.3V,VFB=GND － 500 － μA No load Current Ino-load VIN=1.5V,VOUT=3.3V － 56 － µA Vref Close Loop Vdd=3.3V 1.225 1.25 1.275 V Feedback Reference Voltage Switching Frequency Fs Vdd=3.3V 800 1000 1250 KHz Dmax Vdd=3.3V 70 75 80 % Vdd=3.3V － 0.18 0.25 Ω Vdd=3.3V 2.3 2.5 2.7 A EXT on resistance to VDD Vdd=3.3V － 4 8.0 Ω EXT on resistance to GND Vdd=3.3V － 2.15 8.0 Ω Maximum Duty LX on resistance Current Limit Setting Ilimit Line Regulation ΔVline Vin=3.5~6V,IL=1mA － 0.25 5 mV/V Load Regulation ΔVload VIN=2.5V,IL=1~100mA － 0.5 － mV/mA VDD=3.3V 0.4 0.8 1.2 V CE pin Trip level Temperature Stability for Vout Ts － 50 － Ppm/℃ Thermal Shut down Hysterises ΔTsd － 10 － ℃ ■ Test Circuits Rev.1.0 — Dec. 20, 2011 5 www.natlinear.com LN2266 ■ Typical Performance Characteristics 1. Efficiency vs. Output Current 3. Switching Frequency vs. Vdd pin Voltage 5. Transient Response Rev.1.0 — Dec. 20, 2011 2. Supply Current vs. Input Voltage 6 4. LX pin wave form & Output Ripple 6. Output Voltage vs. Temperature www.natlinear.com LN2266 7.VIN VS The Max Output Current ( VOUT=5.0V) ■ Package Information  SOT-23-6L Rev.1.0 — Dec. 20, 2011 7 www.natlinear.com LN2266  SOT-89-5L Rev.1.0 — Dec. 20, 2011 8 www.natlinear.com LN2266 Rev.1.0 — Dec. 20, 2011 9 www.natlinear.com