M62272GP View Datasheet(PDF) - MITSUBISHI ELECTRIC

Part Name

Description

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M62272GP

5-PIN SOT-23 3V SYSTEM FIXED OUTPUT VOLTAGE DC-DC CONVERTER

MITSUBISHI ELECTRIC  

MITSUBISHI <Standard Linear IC>

M6227XGP

5-PIN SOT-23 3V SYSTEM FIXED OUTPUT VOLTAGE DC-DC CONVERTER

1. Application Circuit (3.3V Output DC-DC Converter; M62270GP)

VIN (5V)

RCLM

0.1ohm

+ 100µF

VOUT(3.3V,1A)

+

100µF

3 IN

4

5

Vcc

CLM

1Kohm

M62270 Collector 1

GND

1Kohm

2

47µH

Fig.1 Example of application circuit of M62270GP

Current Limit Detction:

When the voltage drop between 4pin and 5pin becomes 150mV or more,

Current Limit Detection circuit starts to operate. In the example of application

(fig.1), the current is limited to 1.5A.

2. 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

2

∆Io

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 :Set to 1/3 to 1/5 of maximum output current

• Choose an external transistor, diode and inductor with peak current rating

greater than "Ipk".

( 3 /3)

Jan. 2000

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