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MC33680

Dual DC−DC Regulator for Electronic Organizer

ON Semiconductor 

MC33680

VBAT

VBAT

CMAINb

100 pF

L1

33 mH

RIref

480 kW

CPOR +

80 nF

CVDD +

20 mF

RMAINb

MBRA130LT1

8 IREF 7 AGND 6 VREF 5 PDELAY 4 VDD 3 VBAT 2 VBAT 1 VMAINFB 1000 kW

VBAT

5

300 kW

RLBa

LOBAT−

SEN

9

900 kW

RLBb

DGND

10

PORB

11

Power−On

Reset

x2

ZLC

COMP3

+ve Edge Delay

VDD

for Max. ON Time

RQ

senseFET

M2

M1

S Qb

DGND

1−SHOT

for Min. OFF Time

VDD

RQ

S

ILIM

DGND

COMP2

31

VMAINSW

32 VMAIN

CMAIN +

100 mF

VMAINGND

30

LIBATOUT

28

LIBATIN

27

VBAT

Voltage 1.22 V

Reference

0.5 V

COMP1

VCOMP

Main Regulator

with Synchronous Rectifier

LOWBATB

12

LIBATON

13

LIBATCL

14

DGND

15

AGND

0.85 V,

1.1 V

Lithium

Battery

Backup

Voltage Reference

Current Bias

& Supervisory

+ve Edge Delay

for Max. ON Time

VCOMP

COMP1

RQ

S Qb

1−SHOT

for Min. OFF Time

Auxiliary Regulator

AGND

senseBJT

Q1

ILIM

COMP2

AGND

L2

33 mH

MBRA140T3

25

VAUXSW

+

CAUX

30 mF

VAUXEMR

26

17

VAUXEN

18

VAUXFBP

20

VAUXFBN

2200 kW

RAUXb

21

VAUXBDV

VBAT

22

VAUXCHG

23

VAUXBASE

200 kW

RAUXa

Figure 1. Detailed Application Block Diagram

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