LESHAN RADIO COMPANY, LTD. SMALL PACKAGE PFM CONTROL STEP-UP DC/DC CONVERTER LR8301 Series Introduction The LR8301 Series is a CMOS PFM-control step-up switching DC/DC converter that mainly consists of a reference voltage source, an oscillator, and a comparator. The PFM controller allows the duty ratio to be automatically switched according to the load (light load: 50%, high output current: 75%), enabling products with a low ripple over a wide range, high efficiency, and high output current. With the LR8301 Series, a step-up switching DC/DC configured by converter using an can be external coil, capacitor, and diode. The built-in MOS FET is turned off by a protection circuit when the voltage at the LX pin exceeds the limit to prevent it from being damaged. This feature, along with the mini package and low current Features • Low voltage operation: Startup at 0.9 V min. (IOUT = 1 mA) guaranteed • Duty ratio: 66/78%, builtin auto switching type PFM controller • External parts: Coil, capacitor, diode • Output voltage: Settable to between 1.8 to 6.5 V in 0.1 V steps • Accuracy of ±2% • High efficiency：±85%（typ.） • Standard function (product type A) • Shutdown function (product type C、D) • External transistor type available (product type B、D) consumption, makes the LR8301 Series ideal for applications such as the power supply unit of portable equipment. Applications Ordering Information • Power supply for portable equipment such as digital cameras, electronic notebooks, and PDAs • Power supply for audio equipment such as portable CD/MD players • Constant voltage power supply for cameras, video equipment, and communications equipment • Power supply for microcomputers 1/9 LESHAN RADIO COMPANY, LTD. LR8301 Series Block Diagrams Pin Assignment Table 1 LR8301A Series （SOT-23-3 PKG） Pin No. Pin Name Functions 1 VOUT Output voltage pin 2 VSS GND pin 3 LX External inductor connection pin Table 2 LR8301B Series （SOT-23-3 PKG） Pin No. Pin Name Functions 1 VOUT Output voltage pin 2 VSS GND pin 3 EXT External transistor connection pin Table 3 Pin No. Pin Name LR8301C Series （SOT-23-5 PKG） Functions Shutdown pin “H”: Normal operation “L”: Step-up stopped 1 EN 2 VOUT 3 NC (N.C.) 4 VSS GND pin 5 LX External inductor connection pin Output voltage pin Table 4 Pin No. Pin Name LR8301D Series （SOT-23-5 PKG） Functions Shutdown pin “H”: Normal operation “L”: Step-up stopped 1 EN 2 VOUT 3 NC (N.C.) 4 VSS GND pin 5 EXT External transistor connection pin Output voltage pin 2/9 LESHAN RADIO COMPANY, LTD. LR8301 Series Table 5 LR8301A Series （SOT-89-3 PKG） Pin No. Pin Name Functions 1 VSS GND pin 2 VOUT Output voltage pin 3 LX External inductor connection pin Table 6 LR8301B Series （SOT-89-3 PKG） Pin No. Pin Name Functions 1 VSS GND pin 2 VOUT Output voltage pin 3 EXT External transistor connection pin Table 7 Pin No. Pin Name 1 NC 2 VOUT (N.C.) Output voltage pin 3 EN 4 LX External inductor connection pin 5 VSS GND pin Pin No. Pin Name 1 NC 2 VOUT LR8301D Series （SOT-89-5 PKG） Functions (N.C.) Output voltage pin 3 EN Shutdown pin “H”: Normal operation “L”: Step-up stopped 4 EXT External transistor connection pin 5 VSS GND pin Absolute Maximum Ratings VOUT pin voltage Functions Shutdown pin “H”: Normal operation “L”: Step-up stopped Table 8 Parameter LR8301C Series （SOT-89-5 PKG） (Unless otherwise specified, Ta=25 C) Symbol Unit VOUT Ratings VSS－0.3 ~ VSS＋10 V EN pin voltage EN VSS－0.3 ~ VSS＋10 V LX pin voltage VLX VSS－0.3 ~ VSS＋10 V LX pin current ILX 1000 mA 250 mW PD 250 mW 500 mW Operating temperature Topr －40 ~＋85 °C Storage temperature Tstg －40 ~＋125 °C Power dissipation SOT-23-3 SOT-23-5 SOT-89-3 3/9 LESHAN RADIO COMPANY, LTD. LR8301 Series Electrical Characteristics Parameter (Unless otherwise specified, Ta =25 C) Symbol Conditions VOUT － Input voltage VIN － Operation start voltage VST1 Output voltage Min. Max. Unit － VOUT(S) ×1.02 10 V － － 0.9 V － － 0.8 V － 30 40 µA 50 60 µA VOUT(S) ×0.98 － IOUT= 1 mA Typ. VOUT V No external parts, voltage Oscillation start voltage VST2 applied to VOUT LX pulled up to VOUT via 300 resistor VOUT：3.0V Current consumption 1 ISS1 VOUT=0.95 ×VOUT Current consumption 2 ISS2 VOUT=VOUT＋0.5 V － 6 10 µA Current consumption during shutdown ISSS VEN = 0 V － － 0.5 µA Switching current ISW VLX= 0.4 V 100 200 － mA － － 0.5 µA Switching transistor leakage current ISWQ VOUT：5.0V No external parts, VLX＝VOUT =10 V ,VEN = 0 V Line regulation ∆VOUT1 VIN= 0.4×VOUT～ 0.6×VOUT － 20 50 mV Load regulation ∆VOUT2 IOUT= 10 µA ~ 50mA － 20 50 mV Maximum Oscillation frequency fOSC VOUT= 0.95×VOUT， measure Duty ratio 1 Duty1 VOUT= 0.95×VOUT， measure waveform at LX pin Duty ratio 2 Duty2 Measure waveform at LX pin with light load Efficiency EFFI Shutdown pin input voltage Shutdown pin input current VSH VSL1 100 waveform at LX pin kHz 70 78 85 % － 66 － % 85 VOUT=0.95×VOUT， judge oscillation at LX pin VOUT= 0.95×VOUT， judge stop at LX pin % 0.75 － － V － － 0.3 V ISH VEN＝10V －0.1 － 0.1 µA ISL VEN＝0V －0.1 － 0.1 µA Remark： VIN =VOUT(S) ×0.6 applied, IOUT=VOUT(S) / 250 Ω Shutdown function built-in type: EN pin is connected to VOUT VOUT(S) specified above is the set output voltage value, and VOUT is the typical value of the actual output voltage. 4/9 LESHAN RADIO COMPANY, LTD. LR8301 Series Standard Circuits Component: Inductor：47uH(Sumida) Diode：1N5817、1N5819 Capacitor：47uF/16V(Tantalume type) Transistor：2SD1628G、2SD3279 NMOS：XP151、XP161 Base Resistor(Rb)：1K Ω Base Capacitor(Cb)：2200pF RFB：Set up so that RFB1/ B2=Vout-1(Vout=set-up output voltage), Please use with RFB1 +RFB2≤2M Ω CFB：Set up that Fzfb=1/(2×π×CFB×RFB1) is within the Adjustments necessary in respect of L,CL. 1、 LR8301A Circuits： 3、LR8301B Circuits： 2、LR8301C Circuits： 4、LR8301D Circuits： 5/9 LESHAN RADIO COMPANY, LTD. LR8301 Series Characteristics 1. LR8301A30P： a 、VOUT vs. IOUT : b、 Efficiency vs. IOUT : b、 Efficiency vs. IOUT : 2. LR8301A33P： a 、VOUT vs. IOUT : 3. LR8301A50P： a 、VOUT vs. IOUT : b、 Efficiency vs. IOUT : 6/9 LESHAN RADIO COMPANY, LTD. LR8301 Series 4. LR8301B33P： a 、VOUT vs. IOUT : b、 Efficiency vs. IOUT : b、 Efficiency vs. IOUT : 5. LR8301B36P： a 、VOUT vs. IOUT : 6. LR8301B50P： a 、VOUT vs. IOUT : b、 Efficiency vs. IOUT : 7/9 LESHAN RADIO COMPANY, LTD. LR8301 Series SOT-23 DIM A MIN 0.1102 0.0472 0.0350 0.0150 0.0701 0.0005 0.0034 0.0140 0.0350 0.0830 0.0177 L 3 1 V 2 A B C D G H J K L S V B S G C D H K INCHES MAX 0.1197 0.0551 0.0440 0.0200 0.0807 0.0040 0.0070 0.0285 0.0401 0.1039 0.0236 MILLIMETERS MIN MAX 2.80 3.04 1.20 1.40 0.89 1.11 0.37 0.50 1.78 2.04 0.013 0.100 0.085 0.177 0.35 0.69 0.89 1.02 2.10 2.64 0.45 0.60 J SOT-89 Symbols Dimensions in millimeters Min Nom Max A 1.40 1.50 1.60 b 0.36 0.42 0.48 b1 0.41 0.47 0.53 b2 1.40 1.60 1.75 C 0.38 0.40 0.43 D 4.40 4.50 4.60 E － － 4.25 E1 2.40 2.50 2.60 θ 1.40 1.50 1.60 L 1.80 － － L1 － 0.40 － 8/9 LESHAN RADIO COMPANY, LTD. LR8301 Series SOT- 23- 5 SOT- 89- 5 9/9