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| MITSUBISHI 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 GND 1 2 3 5 CLM IN 4 Vcc FEATURES Wide operation power supply voltage range -- 6V to 15V(Vcc=12V typ.) Low power consumption -- 570A 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 OP Amp 24k 5 CURRENT LIMIT CIRCUIT PWM Comp 1 Collector IN 3 8.25k 1.25V OSC. (120KHz) 2 GND ( 1 /3) Jan. 2000 MITSUBISHI M62291GP 5-PIN SOT-23 5.0V SYSTEM FIXED OUTPUT VOLTAGE DC-DC CONVERTER ABSOLUTE MAXIMUM RATINGS (Ta=25C, unless otherwise noted) Symbol Vcc Io Pd Parameter Supply Voltage Output Current Power Dissipation Ta=25C Ta>25C Conditions Ratings 16 100 200 2.0 -20 to +85 -40 to +125 Unit V mA mW mW/C C C KTHETA Thermal Derating Ratio Topr Tstg Operating Ambient Temperature Storage Temperature ELECTRICAL CHARACTERISTICS (Ta=25C, Vcc=12V, unless otherwise noted) Block Symbol Vcc Icc Vo Vreg-L Error Amp. Parameter Supply Voltage Supply Current Output Voltage REF Line Regulation No load Vcc= 4 to 12V Conditions Limits Min 6.0 4.75 Typ 570 5.0 5 Max 15 800 5.25 30 Units V A V mV Iin IN Input Current Vcc - CLM Vcc = 15V, Vc = 15V Io = 100mA 70 110 -1 - 160 120 140 90 1.2 300 175 170 1 2.0 A KHz mV % A V Oscillator fosc Oscillator Frequency CLM VTHCLM Current Limit Voltage Output TDUTY Maximum ON Duty Output Leakage Current ICL Vsat Output Saturation Voltage ( 2 /3) Jan. 2000 MITSUBISHI M62291GP 5-PIN SOT-23 5.0V SYSTEM FIXED OUTPUT VOLTAGE DC-DC CONVERTER 1. Application Circuit (5.0V Output DC-DC Converter; M62291GP) VIN (12V) + RCLM 0.09ohm 100F 4 Vcc VOUT(5.0V,1A) 3 IN 100F + 5 CLM 1Kohm M62291 Collector 1 1Kohm GND 2 150H 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 + 1 Io 2 0.15 Ipk VCLM:150mV(Vcc=5V) 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 |
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