MITSUBISHI <Standard Linear IC> M62291GP 5-PIN SOT-23 5.0V SYSTEM FIXED OUTPUT VOLTAGE DC-DC CONVERTER DESCRIPTION M62291GP is an integrated circuit designed as 5V fixed output voltage general purpose DC-DC converter. Integrating peripheral components in ultrasmall 5-pin SOT23 package allows for simplified external circuit and compact low cost design. This IC is applicable to portable equipments due to low circuit current 570uA(typ.) Especially this is most suitable for localized power source such as audio equipments, and so on as converter from 12 to 5V system. PIN CONFIGURATION (TOP VIEW) COLLECTOR OUTPUT 1 GND 2 IN 3 5 CLM 4 Vcc FEATURES Wide operation power supply voltage range -- 6V to 15V(Vcc=12V typ.) Low power consumption -- 570µA max.(Vcc=12V typ., at no load) Built-in oscillator without peripheral components (110KHz typ.) Built-in overcurrent protection circuit Ultrasmall 5-pin SOT23 package Outline 5P2X-A (SOT-23) APPLICATIONS Localized power supply for audio, portable equipments, and general electric products BLOCK DIAGRAM VCC CLM 4 5 CURRENT LIMIT CIRCUIT OP Amp PWM Comp 24k IN 1 Collector 3 8.25k 1.25V OSC. (120KHz) 2 GND ( 1 /3) Jan. 2000 MITSUBISHI <Standard Linear IC> M62291GP 5-PIN SOT-23 5.0V SYSTEM FIXED OUTPUT VOLTAGE DC-DC CONVERTER ABSOLUTE MAXIMUM RATINGS (Ta=25C, unless otherwise noted) Symbol Parameter Conditions Ratings Unit Vcc Supply Voltage 16 V Io Output Current 100 mA Pd Power Dissipation Ta=25C 200 mW Ta>25C 2.0 mW/C KTHETA Thermal Derating Ratio Topr Operating Ambient Temperature -20 to +85 C Tstg Storage Temperature -40 to +125 C ELECTRICAL CHARACTERISTICS (Ta=25C, Vcc=12V, unless otherwise noted) Block Symbol Vcc Icc Vo Vreg-L Parameter Conditions Max 570 15 800 4.75 5.0 5 5.25 30 µA V mV - 160 300 µA 70 120 175 110 140 170 KHz mV Vcc = 15V, Vc = 15V -1 90 - 1 µA Io = 100mA - 1.2 2.0 V No load Min Units Typ Supply Voltage Supply Current Output Voltage REF Line Regulation Limits 6.0 - Vcc= 4 to 12V V Error Amp. Iin IN Input Current Oscillator fosc Oscillator Frequency CLM VTHCLM Current Limit Voltage Output TDUTY Maximum ON Duty Output Leakage Current ICL Vsat Output Saturation Voltage Vcc - CLM ( 2 /3) % Jan. 2000 MITSUBISHI <Standard Linear IC> M62291GP 5-PIN SOT-23 5.0V SYSTEM FIXED OUTPUT VOLTAGE DC-DC CONVERTER 1. Application Circuit (5.0V Output DC-DC Converter; M62291GP) RCLM 0.09ohm VIN (12V) + 100µF 5 CLM 4 Vcc 1Kohm VOUT(5.0V,1A) 3 IN M62291 Collector 1 + 100µF 1Kohm GND 2 150µH Fig.1 Example of application circuit of M62270GP Current Limit Detction: When the voltage drop between 4pin and 5pin becomes 140mV or more, Current Limit Detection circuit starts to operate. In the example of application (fig.1), the current is limited to 1.5A. 2. THE EXPRESSION OF CIRCUIT CONSTANTS CONSTANTS TON TOFF (TON+TOFF)MAX TOFF(MIN) TON(MAX) L(MIN) Ipk RCLM • • • • EXPRESSIONS VO+VF VIN - VCE(sat) - VO 1 fosc fosc:110KHz(Vcc=5V) ( TON + TOFF ) / ( 1 + TON ) TOFF 1 fosc - TOFF ( VIN - VCE(sat) - VO ) TON(MAX) ∆Io ∆Io Io + 1 2 0.15 ∆VCLM:150mV(Vcc=5V) Ipk VF : Forward voltage drop of an external diode. Vsat : Output saturation voltage of an external switching transistor. ∆Io :Set to 1/3 to 1/5 of maximum output current Choose an external transistor, diode and inductor with peak current rating greater than "Ipk". ( 3 /3 ) Jan. 2000