MITSUBISHI <Dig./Ana. INTERFACE> M62220L/FP 3.3V FIXED OUTPUT VOLTAGE DC-DC CONVERTER GENERAL DESCRIPTION PIN CONFIGURATION (TOP VIEW) M62220L The M62220 is a general purpose DC-DC converter which provides a 3.3V 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 3.3V . 5 IN 4 VCC 3 CLM 2 GND 1 COLLECTOR Outline 5P5T FEATURES COLLECTOR 1 GND 2 CLM 3 VCC 4 M62220FP · Wide operation supply voltage range ·········· 4 to 15V · Low power consumption ·········· 900µA(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> M62220L/FP 3.3V 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 4.5 Thermal derating Ta=25°C 5-pin SIP mW/°C KTHETA 8-pin SOP 4.4 mW/°C Topr Operating 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 Vo Output voltage Error Amp. Vreg-L Iin Oscillator CLM Output fosc TDUTY VTHCLM Parameter REF line regulation Test Conditions Limits Min. 4.0 Without load 15 V 900 µA 3.15 3.30 5 3.45 100 300 V mV µA 110 155 KHz Maximum on duty 15 90 Vcc - CLM Vcc = 12V, Vc = 12V ICL Output leakage current Vsat Output saturation voltage Io = 100mA (2/3) Unit 660 65 Oscillator frequency Max. - Vcc = 4 to 12V IN input current Current limit voltage Typ. 120 -1 - 150 0.4 180 1 0.7 % mV µA V April. 1997 MITSUBISHI <Dig./Ana. INTERFACE> M62220L/FP 3.3V FIXED OUTPUT VOLTAGE DC-DC CONVERTER Application Circuit (3.3V Output DC-DC Converter) RCLM 0.1Ω VIN (5V) + 100µF 3 CLM 4 Vcc 1KΩ VOUT(3.3V,1A) 5 IN 100µF M62220 Collector 1 + 1KΩ GND 2 47µ H Fig.1 Example of the M62220L/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 ) · 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