RCR2562

® RCR2562 PFM Step-up DC/DC Converter Features • Low Start-up Voltage, 1.1V at 1mA • Minimal Number of External Components ( Only an Inductor, a Diode, a MOSFET and two Capacitors ) •Adjustable version ( VREF = 1.25V VREF = 2.7V or VREF = 3.3V ) • Ultra Low Input Current ( 12μA at Switch Off ) • ±2% High Output Voltage Accuracy • Low Ripple and Low Noise • 75% Efficiency with Low Cost Inductor • SOT23-5L Small Packages battery-powered instruments. Consists of an oscillator, a PFM control circuit, a driver Pin EXT to external MOSFET, a reference voltage unit, an error amplifier. A low ripple and high efficiency step-up DC/DC converter can be constructed of this RCR2562 IC with only six external components. The RCR2562 works on ultra low start-up voltage, typically max start-up voltage less than 1.1V at 1mA load current Applications • Battery-powered equipment • Cameras, Camcorders, VCRs, PDAs, pagers, electronic data banks, and hand-held communication equipment General Description The RCR2562 Series are PFM Step-up DC/DC ICs with ultra low supply current by CMOS process and suitable for use with Package Information ③ ② ① ④ ⑤ Units:mm 1 /7 ISPD-V3.1 ® RCR2562 Pin Configurations Pin Port ① ② ③ ④ ⑤ SOT23-5L FB VIN NC GND EXT Functional Block Diagram Ordering Information RCR2562 - □□□ □□ Package Type SK: SOT23-5L Reference Voltage 125= 1.25V; 270= 2.70V; 330= 3.30V Indicate The Product Number Absolute Maximum Ratings Parameter Output Voltage EXT Pin Voltage EXT Pin Current ( 2 ) Power Dissipation ( TA = 25℃ ) Operating Temperature Range Storage Temperature Range Symbol VOUT VEXT IEXT PD TOPR TSTG Ratings -0.3 to 10 -0.3 to 10 ±30 250 Unit V V mA mW ℃ ℃ -40 to +125 -65 to +150 2 /7 ISPD-V3.1 ® RCR2562 Electrical Characteristics TA = 25℃, unless otherwise specified Parameter Output Voltage Accuracy Input Voltage Symbol ΔVOUT VIN Test Conditions Min -2 -- Typ --1.25 2.70 3.3 1.0 75 85 30 50 6 ----120 78 Max +2 10 1.28 2.75 3.36 1.1 --40 60 12 ----160 85 Unit % V V V V V % RCR2562 - 125SK VFB Voltage VFB RCR2562 - 270SK RCR2562 - 330SK Start-up Voltage Efficiency VOUT ≤ 3.5V VOUT ＞ 3.5V VOUT ≤3.5V VOUT ＞ 3.5V VOUT ≤ 3.5V VOUT ＞ 3. 5V VOUT ≤3.5V VOUT ＞ 3. 5V VOUT ≤ 3.5V VOUT ＞ 3. 5V VST EFFI To be measured at VIN at no load To be measured at VOUT in switch off condition VEXT = VOUT - 0.4V IOUT = 1mA, VIN : 0 to 2V 1.22 2.65 3.24 -------1.5 -2 Input Current1 ISS μA Input Current2 EXT“H”Output Current EXT“L”Output Current Maximum Oscillator Oscillator Duty Cycle ISWITCHING μA ISH mA ISL FMAX DOSC VEXT = 0.4V 1.5 2 80 mA kHz % On (VLX ”L” ) side 70 Note1 Vout（T）= Specified output Voltage. Note2 Unless otherwise provided, VSS = GND, IOUT = 10mA, Note3 MOSFET: RCR1516 Typical Application Circuit ( VOUT = 5V ) Components : Inductor : 47uH, Diode : 1N5818, NMOS : RCR1516 Output Capacitor : 47uF/16V ( Tantalum ) Input Capacitor : 1uF/10V ( Tantalum ) 3 /7 ISPD-V3.1 ® RCR2562 Typical Performance Characteristics 1、 RCR2562 ( When VOUT = 5V ) : 2.0 START-UP Voltage (v) 1.8 1.6 1.4 1.2 1.0 0.8 0 20 RCR1513SI xx151 RCR1516 40 60 80 100 120 Output Current(mA) Figure1.Start-up Voltage VS Output Current 2、 RCR2562-125、RCR2562-27 ( VOUT = 3.0V ) : Figure2. Output Voltage VS Output Current Figure3. Efficiency VS Output current 3、 RCR2562 ( VOUT = 3.3V ) ： 4 /7 ISPD-V3.1 ® RCR2562 Figure4. Output Voltage VS Output current Figure5. Efficiency VS Output current 4、 RCR2562 ( VOUT = 5.0V ) ： Figure6. Output Voltage VS Output current 5 /7 ISPD-V3.1 ® RCR2562 5、Efficiency VS. Output Current: Figure7. Efficiency VS Output current 6 /7 ISPD-V3.1 ® RCR2562 DISCLAIMER INNOVA SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. INNOVA DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICIENCE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. 7 /7 ISPD-V3.1