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| MITSUBISHI M62222L/FP 2.7V FIXED OUTPUT VOLTAGE DC-DC CONVERTER GENERAL DESCRIPTION M62222 is a general purpose DC-DC converter which provides a 2.7V fixed output voltage. It is possible to simplify the peripheral circuit and to design compact and low cost sets because this IC, housed in a small 5- or 8-pin package includes necessary peripheral components. Especially this is most suitable for CD-ROM, Disk Drive sets and PDA as a converter from 5V to 2.7V . PIN CONFIGURATION (TOP VIEW) M62222L COLLECTOR 1 GND 2 CLM 3 VCC 4 5 IN 4 VCC 3 CLM 2 GND 1 COLLECTOR FEATURES * Wide operation supply voltage range ********** 4 to 15 V * Low power consumption ********** 900 A(max.) * Built-in oscillator without external components (110KHz typ.) * Built-in over current protection circuit * Small 5-pin SIP and 8-pin SOP packages Outline 5P5T 8 NC 7 NC 6 NC 5 IN Outline 8P2S-A APPLICATIONS CD-ROM, PDA, general purpose electric products NC: NO CONNECTION M62222FP BLOCK DIAGRAM VCC OVER CURRENT DETECTION RESISTOR CLM 4 OP Amp 3 CURRENT LIMIT CIRCUIT IN PWM Comp 1 Collector 5 1.25V OSC. (110KHz) 2 GND OUT (1/3) April 1996 MITSUBISHI M62222L/FP 2.7V 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 5-pin SIP 8-pin SOP Ta>25C 5-pin SIP 8-pin SOP Conditions Ratings 16 100 450 440 4.5 4.4 -20 - +85 -40 - +125 Unit V mA mW mW mW/ C mW/ C C C KTHETA Topr Tstg Thermal derating Operating temperature Storage temperature ELECTRICAL CHARACTERISTICS (Ta=25C, Vcc=5V, unless otherwise noted) Block All block Error Amp. Oscillator CLM Output Symbol Vcc Icc Vo Vreg-L Iin fosc TDUTY VTHCLM ICL Vsat Parameter Supply voltage Supply current Output voltage REF line regulation IN input current Oscillator frequency Maximum on duty Current limit voltage Output leakage current Vcc - CLM Vcc = 12V, Vc = 12V 120 -1 -- Vcc= 4 to 12V -- 65 Whthout load Test conditions Limits Min. 4.0 -- 2.57 Typ. 660 2.70 5 100 110 90 150 -- 0.4 180 1 0.7 Max. 15 900 2.83 15 300 155 Unit V A V mV A kHz % mV A V Output saturation voltage Io = 100mA (2/3) April 1996 MITSUBISHI M62222L/FP 2.7V FIXED OUTPUT VOLTAGE DC-DC CONVERTER Application Circuit (2.7V Output DC-DC Converter) VIN (5V) + RCLM 0.1 100F 4 Vcc VOUT(2.7V,1A) 5 IN 100F + 3 CLM Collector 1 1K M62222 1K GND 2 68H Fig.1 Example of the M62222L/FP application circuit * Current Limit Detection: When the voltage drop between pin 3 and pin 4 becomes more than 150mV, the Current Limit Detection circuit begins operating. The peak switch current "Ipk" is limited to 150mV / RCLM. In the example of application (fig.1), the current is limited to 1.5A. THE EXPRESSION OF CIRCUIT CONSTANTS CONSTANTS TON TOFF (TON+TOFF)MAX TOFF(MIN) TON(MAX) L(MIN) Ipk RCLM 1 fosc EXPRESSIONS VO+VF VIN - VCE(sat) - VO fosc:110KHz(Vcc=5V) TON ) TOFF ( TON + TOFF ) / ( 1 + 1 fosc - TOFF ( VIN - VCE(sat) - VO ) x TON(MAX) Io Io + 1 Io 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 : It should be set between1/3 and 1/5 of maximum output current. *An external transistor, diode and inductor should have a peak current capability of greater than "Ipk". (3/3) April 1996 |
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