MC34280FTBR2 datasheet(2/20 Pages) ONSEMI

Part #	MC34280FTBR2

Description	Power Supply & Management IC for Handheld Electronic Products

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Manufacturer	ONSEMI [ON Semiconductor]

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MC34280

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2

Power

ON

Reset

Lithium

Battery

Backup

Voltage

Reference

Low

Battery

Detect

Current

Bias

Control and

Gate Drive

Startup

Current

Limit

Main Regulator with

Synchronous Rectifier

LIBATCL

LIBATON

LOWBATB

PORB

DGND

LOWBATSEN

14

13

12

11

10

9

GND

RLBb

r = 900 k

RLBa

r = 300 k

LIBATIN

27

28

29

30

31

32

GND

N/C

LIBATOUT

VMAINGND

VMAINSW

1N5817

M2

M1

IREF

AGND

87

VREF

VBAT

GND

RMAINb

r = 1000 k

CMAINb

c = 100p

VBAT

VMAIN

PDELAY

VDD

VMAINFB

VBAT

65

4

VREF

GND

Ren

r = 1000 k

VBAT

Battery

Lock

Switch

VMAIN

GND

CVDD

c = 20u

32

1

ENABLE

Riref

r = 480 k

R123

r = 5

CMAIN

c = 100u

10 V SMT

tantalum

LMAIN

L = 33u

(Rs < 60 mOhm)

GND

Optional

CMAINbp

c = 100u

10 V SMT

tantalum

M3

d

s

d

s

d

s

GND

Figure 1. Typical Application Block Diagram

Cpor

c = 80n

VAUXADJ

15

VAUXCON

16

VAUXEN

17

VBAT

LIBATCL

LIBATON

LOWBAT

PORB

VAUXADJ

VAUXCON

VAUXEN

VAUXFBP

GND

Optional

CAUXbp

c = 100u

10 V SMT

tantalum

VBAT

18

20

21

19

22

23

24

Level

Control

Current

Limit

Auxiliary Regulator

Control and

Base Drive

LAUX

L = 22u

(Rs < 60 mOhm)

VAUXFBN

GND

Caux

c = 30u

30 V SMT

tantalum

VAUX

1N5818

GND

VAUXREF

(1.1 V to 2.2 V)

VAUXBDV

VAUXCHG

VAUXBASE

N/C

Rauxb

r = 2.2 M

Rauxa

r = 200 k

GND

CAUXb

c = 2n

CAUXa

c = 33n

Q1

VAUXEMR

26

VAUXSW

25

Optional

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MC34280FTBR2 Datasheet(PDF) 2 Page - ON Semiconductor

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