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M62222FP

2.7V FIXED OUTPUT VOLTAGE DC-DC CONVERTER

MITSUBISHI ELECTRIC  

MITSUBISHI <Dig./Ana. INTERFACE>

M62222L/FP

2.7V FIXED OUTPUT VOLTAGE DC-DC CONVERTER

Application Circuit (2.7V Output DC-DC Converter)

VIN (5V)

RCLM

0.1Ω

+ 100µF

VOUT(2.7V,1A)

+

100µF

5 IN

4

3

Vcc

CLM

M62222 Collector 1

GND

2

1KΩ

1KΩ

68µH

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

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

Ipk

∆VCLM:150mV(Vcc=5V)

•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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