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| MITSUBISHI(Standard Linear ICs) M62294FP 3.3V, 2.0V FIXED 2-OUTPUT VOLTAGE DC-DC CONVERTER DESCRIPTION M62293FP is 3.3V and 2.5V f ixed stable 2-output step-down DC-DC conv erter. It is possible to simplif y peripheral circuit and to design compact and low cost sets because this dev ice includes peripheral dev ices 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), theref ore an application sy s t em is protected system errors. Especially this is most suitable f or application sy s y t em 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 *3.3V and 2.0V step-down conv erter *4 to 15V wide input supply v oltage (Vcc=5V ty p.) *Reset circuit with time delay monitors supply v oltage(Vcc=5V)and regulator output (3.3V) *110kHz f ixed f requency oscillator without peripheral dev ices *8pin SOP package Outline 8P2S-A APPLICATION application sy s t em 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(2.0V) GND ( 1 / 4) 000131 MITSUBISHI(Standard Linear ICs) M62294FP 3.3V, 2.0V FIXED 2-OUTPUT VOLTAGE DC-DC CONVERTER ABSOLUTE MAXIMUM RATINGS(Ta=25C,unless otherwise noted) Symbol Vcc Io IoRESET Pd K Topr Tstg Supply v oltage Output current(DC-DC conv erter 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) Limits Block All Blocks Symbol Vcc Icc Vo1 Vo2 Error Amp. Vreg-L Iin Iin Oscillator Output f osc TDUTY ICL Vsat Reset circuit Block Vs1 Vs1 Vs2 Reset Circuit Vs2 IPD tpd IOC VOL VOH Detecting v oltage 1 hysterisy s v oltage 1 Detecting v oltage 2 Hysterisy s v oltage 2 Cd output current Delay t ime RESET output current RESET LOW v oltage RESET High v oltage 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 v oltage Supply c urrent Without load ch1 output ch2 output Vcc=4~12V ch1 ch2 Test condition Min. 4.0 3.15 1.90 65 Vcc=12V, Vc=12V Io=10mA,Darlington connection -1 Ty p. 5.0 1.5 3.30 2.00 5 150 100 110 90 1.2 Max. 15 2.8 3.45 2.10 15 450 300 160 1 2.0 Unit V mA DC-DC Conv erter Block Output v oltage Line regulation Input current 1 Input current 2 Oscillator f requency Maximum ON duty Output leakage current Output saturation v oltage V mV A A KHz % V V ( 2 / 4) 000131 MITSUBISHI(Standard Linear ICs) M62294FP 3.3V, 2.0V 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) M62294FP 3.3V, 2.0V FIXED 2-OUTPUT VOLTAGE DC-DC CONVERTER APPLICATION CIRCUIT (3.3V and 2.0V 2-output voltage DC-DC converter VIN(5V) + Cin VOUT1(3.3V) + Vcc IN1 Cout1 R2 Q1 R1 L1 R4 D1 Co1 M62294FP + VOUT2(2.0V) Co2 IN2 RESET Cd Cout2 R3 Q2 L2 D2 GND 3.3V LINE 2.0V LINE MCU etc. THE EXPRESSION OF CIRCUIT CONSTANTS Constants T ON T OFF (T ON+T OFF)MAX T OFF(MIN) T ON(MAX) L(MIN) Ipk 1 fosc Expressions VO+VF VIN - VCE(sat) - VO fosc:110KHz(Vcc=5V) T ON ) T OFF ( TON + T OFF ) / ( 1 + 1 fosc - TOFF ( VIN - VCE(sat) - VO ) X TON(MAX) Io 1 Io 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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