MITSUBISHI <Dig./Ana. INTERFACE> M62221L/FP 3.0V FIXED OUTPUT VOLTAGE DC-DC CONVERTER GENERAL DESCRIPTION PIN CONFIGURATION (TOP VIEW) M62221L The M62221 is a general purpose DC-DC converter which provides a 3.0V 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 3.0V . 5 IN 4 VCC 3 CLM 2 GND 1 COLLECTOR Outline 5P5T FEATURES COLLECTOR 1 GND 2 CLM 3 VCC 4 M62221FP • Wide operation supply voltage range ·········· 4 to 15 V • Low power consumption ·········· 900 µA(max.) • Built-in oscillator without external components (110kHz typ.) • Built-in over current protection circuit • Small size 5-pin SIP and 8-pin SOP packages 8 NC 7 NC 6 NC 5 IN Outline 8P2S-A NC: NO CONNECTION APPLICATIONS CD-ROM, PDA, general purpose electric products BLOCK DIAGRAM OVER CURRENT DETECTION RESISTOR VCC CLM 4 3 CURRENT LIMIT CIRCUIT OP Amp PWM Comp IN 1 Collector 5 1.25V OSC (110KHz) 2 GND OUT (1/3) April. 1997 MITSUBISHI <Dig./Ana. INTERFACE> M62221L/FP 3.0V FIXED OUTPUT VOLTAGE DC-DC CONVERTER ABSOLUTE MAXIMUM RATINGS (Ta=25°C, unless otherwise noted) Symbol Parameter Conditions Ratings Unit Vcc Supply voltage 16 V Io Output current 100 mA 450 mW Power dissipation Ta=25°C 5-pin SIP Pd 8-pin SOP 440 mW KTHETA Ta>25°C 5-pin SIP 4.5 mW/ °C Thermal derating 8-pin SOP 4.4 mW/ °C Topr Operating ambient temperature -20 to +85 °C Tstg Storage temperature -40 to +125 °C ELECTRICAL CHARACTERISTICS (Ta=25°C, Vcc=5V, unless otherwise noted) Block Symbol All block Vcc Supply voltage Icc Supply current Error Amp. Vo Vreg-L Iin Oscillator CLM Output fosc TDUTY VTHCLM Parameter Test conditions Min. Typ. 4.0 Without load Output voltage REF line regulation Limits Max. 15 V — 660 900 µA 2.85 3.00 5 3.15 V mV Vcc= 4 to 12V 15 IN input current — 100 300 Oscillator frequency 65 110 155 Maximum on duty Current limit voltage 90 Vcc - CLM Vcc = 12V, Vc = 12V ICL Output leakage current Vsat Output saturation voltage Io = 100mA (2/3) Unit 120 -1 150 — 180 1 — 0.4 0.7 µA kHz % mV µA V April. 1997 MITSUBISHI <Dig./Ana. INTERFACE> M62221L/FP 3.0V FIXED OUTPUT VOLTAGE DC-DC CONVERTER Application Circuit (3.0V Output DC-DC Converter) RCLM 0.1Ω VIN (5V) + 100µF 4 Vcc 3 CLM VOUT(3.0V,1A) 5 IN 100µF 1KΩ M62221 Collector 1 1KΩ + GND 2 68µH Fig.1 Example of the M62221L/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 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 ) 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 between 1/3 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. 1997