FREQ datasheet(21/56 Pages) FUJITSU

21 / 56 page

MB39A214A

Limitation : development tool vendor use only

FUJITSU SEMICONDUCTOR CONFIDENTIAL

DS405-00007-1v0-E

Enable function table

EN1 pin

EN2 pin

DC/DC converter (CH1)

DC/DC converter (CH2)

OFF

DC/DC Control mode function table

MODE pin

DC/DC control

GND connection

Automatic PFM/PWM selection mode

OPEN

Automatic PFM/PWM selection mode with PAF function

VB connection

PWM-fixed mode

Switching frequency control function table

FREQ pin

Switching frequency

GND connection

fOSC1

230 kHz, fOSC2

310 kHz

OPEN

fOSC1

460 kHz, fOSC2

620 kHz

VB connection

fOSC1

750 kHz, fOSC2

1000 kHz

Protection function table

The following table shows the state of the VB pin (pin 18), the DRVH1 pin (pin 24), the DRVH2 pin (pin

13), the DRVL1 pin (pin 22), the DRVL2 pin (pin 15) when each protection function operates.

Output of each pin

after detection

Protection

function

Detection condition

DRVH1,

DRVH2

DRVL1,

DRVL2

DC/DC output

dropping operation

Under Voltage

Lockout Protection

(UVLO)

VB < 4.0 V

—

Natural electric

discharge

Over-current

limitation

(ILIM)

VPGND - VLX1, VLX2 >

VILIM1, VILIM2

5.2 V Switching Switching

The voltage is dropped

by the constant current

Over Voltage

Protection

(OVP)

VFB1, VFB2 >

INTREF1, INTREF2 1.15

(15 µs or higher)

5.2 V

0 V clamping

Under Voltage

Protection

(UVP)

VFB1, VFB2 >

INTREF1, INTREF2 0.7

(150 µs or higher)

5.2 V

Electrical discharge by

discharge function

Over Temperature

Protection

(OTP)

Tj > + 150 °C

5.2 V

Electrical discharge by

discharge function

Enable

(EN)

EN1, EN2: H

→ L

(VOUT1, VOUT2 > 0.2 V)

5.2 V

Electrical discharge by

discharge function

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