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| MITSUBISHI(Standard Linear ICs) M62293FP 3.3V, 2.5V FIXED 2-OUTPUT VOLTAGE DC-DC CONVERTER DESCRIPTION M62293FP is 3.3V and 2.5V fixed stable 2-output step-down DC-DC converter. It is possible to simplify peripheral circuit and to design compact and low cost sets because this device includes peripheral devices in small size 8pin package. The IC also has Reset circuit with time delay that monitors power supply(Vcc=5V) and one regulator output(Vout1=3.3V;IN1 terminal), therefore an application system is protected system errors. Especially this is most suitable for application sysytem with microprocessor and ASIC. PIN CONFIGURATION(TOP VIEW) Cout1 GND Cout2 Vcc 1 2 3 4 8 7 6 5 IN1 RESET Cd IN2 FEATURES q 3.3V and 2.5V step-down converter q 4 to 15V wide input supply voltage (Vcc=5V typ.) q Reset circuit with time delay monitors supply voltage(Vcc=5V)and regulator output (3.3V) q 110kHz fixed frequency oscillator without peripheral devices q 8pin SOP package Outline 8P2S-A APPLICATION application system with microprocessor and ASIC BLOCK DIAGRAM Vcc Cd IN1;3.3V 25A Vref 1.25V 0.6A comparator (3.3V detect) comparator (Vcc detect) RESET Vcc oscillator (110kHz) Cout1 Cout2 PWM comp. op amp op amp PWM comp. IN1(3.3V) IN2(2.5V) GND ( 1 /4) 000131 MITSUBISHI(Standard Linear ICs) M62293FP 3.3V, 2.5V FIXED 2-OUTPUT VOLTAGE DC-DC CONVERTER ABSOLUTE MAXIMUM RATINGS(Ta=25C,unless otherwise noted) Symbol Vcc Io IoRESET Pd K Topr Tstg Supply voltage Output current(DC-DC converter block) Output current(Reset block) Power dissipation Thermal derating Operating temperature Storage temperature Ta=25C Ta>25C ch1,ch2 Parameter Conditions Ratings 16 30 6 440 4.4 -20~+85 -40~+125 Unit V mA mA mW mW/C C C ELECTRICAL CHARACTERISTICS(Ta=25C,Vcc=5V,unless otherwise noted) Block All Blocks Symbol Vcc Icc Vo1 Vo2 Error Amp. Vreg-L Iin Iin Oscillator Output fosc TDUTY ICL Vsat Reset circuit Block Vs1 Vs1 Vs2 Vs2 IPD tpd IOC VOL VOH Detecting voltage 1 hysterisys voltage 1 Detecting voltage 2 Hysterisys voltage 2 Cd output current Delay time RESET output current RESET LOW voltage RESET High voltage Cd=4700pF Vcc=5V, Vo=1/2 x Vcc IoRESET=4mA ch1output(3.3V)detection Vcc=5V detection 3.6 30 2.46 30 -1.1 5 -40 0.8Vo1 3.8 50 2.58 50 -0.6 10 -25 4.0 80 2.70 80 -0.3 20 -17 0.2Vo1 V mV V mV A msec A V V Parameter Supply voltage Supply current Without load ch1 output ch2 output Vcc=4~12V ch1 ch2 Test condition Limits Min. 4.0 3.15 2.37 65 Vcc=12V, Vc=12V Io=10mA,Darlington connection -1 Typ. 5.0 1.5 3.30 2.50 5 150 100 110 90 1.2 Max. 15 2.8 3.45 2.63 15 450 300 160 1 2.0 Unit V mA DC-DC Converter Block Output voltage Line regulation Input current 1 Input current 2 Oscillator frequency Maximum ON duty Output leakage current Output saturation voltage V mV A A KHz % V V Reset Circuit ( 2 /4) 000131 MITSUBISHI(Standard Linear ICs) M62293FP 3.3V, 2.5V FIXED 2-OUTPUT VOLTAGE DC-DC CONVERTER RESET BLOCK timing chart 5V 3.85V 3.80V 0V t 3.3V 2.63V 2.58V 0V t Vo1 td 0V td td t td : RESET Delay Time *** td(msec) = 2.13 x 10 x Cd(pF) -3 ( 3 / 4) 000131 MITSUBISHI(Standard Linear ICs) M62293FP 3.3V, 2.5V FIXED 2-OUTPUT VOLTAGE DC-DC CONVERTER APPLICATION CIRCUIT (3.3V and 2.5V 2-output voltage DC-DC converter VIN(5V) + Cin VOUT1(3.3V) + Vcc IN1 Cout1 R2 Q1 R1 L1 R4 D1 Co1 M62293FP + VOUT2(2.5V) Co2 IN2 RESET Cd Cout2 GND R3 L2 Q2 D2 3.3V LINE 2.5V LINE MCU etc. THE EXPRESSION OF CIRCUIT CONSTANTS Constants TON TOFF (TON+TOFF)MAX TOFF(MIN) TON(MAX) L(MIN) Ipk 1 fosc Expressions VO+VF VIN - VCE(sat) - VO fosc:110KHz(Vcc=5V) ( 1+ TON ) TOFF ( TON + TOFF) / 1 fosc - TOFF ( VIN - VCE(sat) - VO ) x TON(MAX) Io Io + 1 Io 2 note: * 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 approximately greater than "Ipk". ( 4 /4 ) 000131 |
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