MB39A107PFT - Fujitsu Limited

(1/18)

*This document summarizes major features of the device. The contents of this document are

preliminary. A formal specification is separately provided by “DATA SHEET”.

FUJITSU ASSP PRODUCTS

Power Management ICs

Version 1.0

March ,2002

DC/DC Converter IC for Charging Li-ion battery

with Synchronous Rectification

MB39A107

•

DESCRIPTION

The MB39A107 is a DC/DC converter IC for charging suitable for down-conversion, using pulse-width

modulation (PWM) type and enabling output voltage to be set to any desired level from one cell to four

cells. The output for the Nch MOS drive of the synchronous rectification type is adopted.

The current amp which can set the offset voltage is built-in. As a result, it can be used for the current

watch of the AC adapter and the battery. Moreover, this IC can also dynamically control the secondary

battery’s charge current by detecting a voltage drop in an AC adapter in order to keep its power constant

(dynamically-controlled charging).

The MB39A107 provides a broad power supply voltage range and low standby current as well as high

efficiency, making it ideal for use as a built-in charging device in products such as notebook PC.

•

FEATURES

•

Built-in current detection amplifier by which offset voltage can be adjusted

•

Output voltage setting accuracy : 4.2V

±

0.74%(Ta=-10

°

C to +85

°

C)

•

Output voltage setting using external resistor : 1 cell to 4 cells

•

Power supply voltage range : 7 V to 25 V

•

Oscillation frequency range : 100kHz to (1MHz)

•

In standby mode, leave output voltage setting resistor open to prevent inefficient current loss

•

Built-in standby current function : 0

µ

A(Typ)

•

Built-in circuit for load-independent soft-start

•

Built-in output off function at low input voltage

•

Totem-pole type output for Nch MOS FET

•

(2/18)

•

PIN DISCRIPTIONS

Pin No. Pin Name I/O Description

1 VCC - Power supply terminal for reference voltage and control circuit.

2 +INUV I Under voltage detection comparator (UV Comp.) input terminal.

3 OUTC1 O Current detection amplifier (Current Amp1) output terminal.

4 -INC1 I Current detection amplifier (Current Amp1) input terminal.

5 +INC1 I Current detection amplifier (Current Amp1) input terminal.

6 IOFA1 I Current detection amplifier (Current Amp1) offset voltage input terminal.

7 +INE1 I Error amplifier (Error Amp1) non-inverted input terminal.

8 -INE1 I Error amplifier (Error Amp1) inverted input terminal.

9 FB1 O Error amplifier (Error Amp1) output terminal.

10 OUTC2 O Current detection amplifier (Current Amp2) output terminal.

11 -INC2 I Current detection amplifier (Current Amp2) input terminal.

12 +INC2 I Current detection amplifier (Current Amp2) input terminal.

13 +INE2 I Error amplifier (Error Amp2) non-inverted input terminal.

14 -INE2 I Error amplifier (Error Amp2) inverted input terminal.

15 FB2 O Error amplifier (Error Amp2) output terminal.

16 -INE3 I Error amplifier (Error Amp3) inverted input terminal.

17 FB3 O Error amplifier (Error Amp3) output terminal.

18 OUTD O With IC in standby mode, this terminal is set to “Hi-Z” to prevent loss

of current through output voltage setting resistance.

Set CTL terminal to “H” level to output “L” level.

19 CS - Soft-start setting capacitor terminal.

20 RT - Triangular wave oscillation frequency setting resistor connection terminal.

21 VREF O Reference voltage output terminal.

22 GND - Ground terminal.

23 CTL-1 I DC/DC converter block power supply control terminal.

24 CTL-2 I Current detection amplifier (Current Amp2) power supply control terminal.

25 PGND - Ground terminal.

26 OUT-2 O External synchronous rectification side FET gate drive terminal.

27 VS - External main side FET source connection terminal.

28 OUT-1 O External main side FET gate drive terminal.

29 CB - Boot capacitor connection terminal.

Connect a capacitor between the CB and VS terminals.

30 VB O Output circuit bias output terminal.

(3/18)

•

••

• BLOCKDIAGRAM

-INE1

OUTC1

-INC1

+INE1

<ErrorAmp1> VREF

OUTC2

+INC2

-INC2

+INE2

VREF

4.2V

VREF

< SOFT>

bias

VREF

5.0V

+INC1

FB1

-INE2

FB2

-INE3

OUTD

FB3

CS

Cs

10uA

R

T

VREF GND

4.2V

Vcc

CTL-1

Out put volt age (Bat t ery

volt age) i s adj ust abl e.

Battery

Ichg

RS1

R

T

V

O

8

2

5

4

7

9

14

10

12

11

13

15

16

18

17

19

20 21 22

23

A

B×25

A B

VREF

Vcc

UVLO

VREF

UVLO

2.5V

1.5V

CB

VB Reg. VB

VCC

Drv-1

Drv-2

VS

PGND

29

28

27

26

25

(6.0V)

OUT-1

OUT-2

30

Dead Tim e

Modulation

H:UV LO rel ease

6

7V to 25V

4.2V

C

T

To Microprocessor

24

CurrentAmp1

ON/OFF

CTL-2

×25

Offset adjus t m ent

IOFA1

DC/DC

ON/OFF

Chg_ctr

4.05V

+INUV

45pF

RS2

3 1

(4/18)

•

PIN ASSIGNMENT

(TOP VIEW)

VCC 130 VB

+INUV 229 CB

OUTC1 328 OUT-1

-INC1 427 VS

+INC1 526 OUT-2

IOFA1 625 PGND

+INE1 724 CTL-2

-INE1 823 CTL-1

FB1 922 GND

OUTC2 10 21 VREF

-INC2 11 20 RT

+INC2 12 19 CS

+INE2 13 18 OUTD

-INE2 14 17 FB3

FB2 15 16 -INE3

(FPT-30P-M04)

(5/18)

•

ABSOLUTE MAXIMUM RATINGS

Parameter Symbol

Condition Rating Unit

Power supply voltage V

CC

−

27 V

Boot voltage V

CB

CB terminal 32 V

Control input voltage V

CTL

CTL-1,CTL-2 terminal 27 V

Output current I

OUT

−

60 mA

Power dissipation P

D

Ta

<

25

°

C 1390* mW

Storage temperature T

STG

−

-55 to 125

°

C

*

When mounted on a 10cm square epoxy double-sided.

(6/18)

•

RECOMMENDED OPERATION CONDITIONS

Parameter Symbol

Condition MIN TYP MAX Unit

Power supply voltage V

CC

−

7

−

25 V

Boot voltage V

CB

CB terminal

−

30 V

Reference voltage

Output current I

REF

−

-1

−

0 mA

Bias output current I

VB

−

-1

−

0 mA

V

INE

+INE1 to +INE3, -INE1,-

INE2

terminal 0

−

V

CC

-1.8

V

INC

+INC1,+INC2, -INC1,-INC2

terminal 0

−

V

CC

V

Input voltage

V

INUV

+INUV terminal 0

−

V

CC

V

IOFA1 terminal input

voltage V

IOFA1

−

0

−

5 V

OUTD terminal output

voltage V

OUTD

−

0

−

17 V

OUTD terminal output

current I

OUTD

−

0

−

2 mA

CTL terminal input

voltage V

CTL

−

0

−

25 V

Output current I

OUT

−

-45

−

45 mA

I

OUT

Main side,

Duty

≤

5%(t=1/fosc

×

Duty) -600

−

600 mA

Peak output current I

OUT

Synchronous rectification

side,

Duty

≤

5%(t=1/fosc

×

Duty)

-1200

−

1200 mA

Oscillation frequency f

OSC

−

100 (500) (1000) kHz

Timing resistor R

T

−

(22) (47) (200) k

Ω

Soft-start capacitor Cs

−

0.022 1.0

µ

F

Boot capacitor C

B

− −

0.1 1.0

µ

F

Bias output capacitor C

VB

−

(0.47) (1.0) (10)

µ

F

Reference voltage

output capacitor C

REF

- - 0.1 1.0

µ

F

Operating ambient

Temperature Ta - -30 25 85

°

C

Please be advised that this specification might be changed for some reasons such as improvement of performance without any

pre-notice.

(7/18)

•

ELECTRICAL CHARACTERISTICS

(Ta = 25

°

C, VCC =19V, VB=0mA, VREF=0mA)

Parameter Symbol

No. Condition

Min. Typ. Max. Unit

1. Reference Voltage [REF]

V

REF1

Ta=+25

°

C (4.967)

5.000 (5.041) V

Output voltage V

REF2

Ta=-10

°

C to +85

°

C (4.95 5.00 (5.05) V

Input stability Line VCC=7V to 25V

−

3 10 mV

Load stability Load VREF=0mA to –1mA

−

1 10 mV

Short-circuit

output current

I

OS

VREF=1V -50 -25 -12 mA

2. Under Voltage Lockout Protection Circuit Block [UVLO]

V

TLH

VCC = 6.2 6.4 6.6 V

Threshold voltage V

THL

VCC =

5.2 5.4 5.6 V

Hysteresis width V

H

−

0.7 1.0 1.3 V

V

TLH

VREF =

2.6 2.8 3.0 V

Threshold voltage V

THL

VREF =

2.4 2.6 2.8 V

Hysteresis width V

H

−

0.05 0.20 0.35 V

3. Soft-Start Block [SOFT]

Charge Current I

CS

−

-14 -10 -6

µ

A

4. Triangular Wave Oscillator Block [OSC]

Oscillation frequency fosc (RT=47k

Ω

) (450) 500 (550) kHz

Frequency

temperature stability

∆

f/fdt Ta=-30

°

C to +85

°

C

−

1*

−

%

5-1. Error Amplifier Block [Error Amp1]

V

TH1

FB1=2V, Ta=+25

°

C (4.179)

4.200 (4.221) V

Threshold voltage V

TH2

FB1=2V,

Ta=-10

°

C to +85

°

C 4.169 4.200 4.231 V

Input offset voltage V

IO

FB1=2V

−

1 5 mV

Input bias voltage I

B

−

-100 -30

−

nA

Voltage gain A

V

DC

−

100*

−

dB

Frequency band width BW AV=0dB

−

2*

−

MHz

V

FBH

−

4.7 4.9

−

V

Output voltage V

FBL

−

20 200 mV

*

Standard design value

(8/18)

(Ta = 25

°

C, VCC =19V, VB=0mA, VREF=0mA)

Parameter Symbol

No. Condition

Min. Typ. Max. Unit

Output source current I

SOURCE

FB1=2V

−

-2 -1 mA

Output sink current I

SINK

FB1=2V 150 300

−

µ

A

5-2. Error Amplifier Block [Error Amp2]

Input offset voltage V

IO

FB2=2V

−

1 5 mV

Input bias voltage I

B

−

-100 -30

−

nA

Voltage gain A

V

DC

−

100*

−

dB

Frequency band width BW AV=0dB

−

2*

−

MHz

V

FBH

−

4.7 4.9

−

V

Output voltage V

FBL

−

20 200 mV

Output source current I

SOURCE

FB2=2V

−

-2 -1 mA

Output sink current I

SINK

FB2=2V 150 300

−

µ

A

5-3. Error Amplifier Block [Error Amp3]

V

TH1

FB1=2V, Ta=+25

°

C (4.179)

4.200 (4.221) V

Threshold voltage V

TH2

FB1=2V,

Ta=-10

°

C to +85

°

C 4.169 4.200 4.231 V

Voltage gain A

V

DC

−

100*

−

dB

Frequency band width BW AV=0dB

−

2*

−

MHz

V

FBH

−

4.7 4.9

−

V

Output voltage V

FBL

−

20 200 mV

Output source current I

SOURCE

FB1=FB2=2V

−

-2 -1 mA

Output sink current I

SINK

FB1=FB2=2V 150 300

−

µ

A

OUTD terminal output

leak current I

LEAK

OUTD=17V

−

0 1

µ

A

OUTD terminal output

ON resistance R

ON

OUTD=1mA

−

35 50

Ω

6-1. Current Amplifier Block [Current Amp1]

Input offset voltage V

IO

+INC=-INC=

3V to Vcc,

IOFA1=2.5V (-1)

−

(1) mV

Voltage gain A

V

+INC=3V to Vcc

∆

Vin=-100mV,

IOFA1=2.5V (24.25)

25 (27.25) V/V

*

: Standard design value

(9/18)

(Ta = 25

°

C, VCC =19V, VB=0mA, VREF=0mA)

Parameter Symbol

No. Condition

Min. Typ. Max. Unit

I

INC1

+INC=-INC=19V

−

(50)

−

µ

A

Input current

I

INC2

CTL-2=0V,

+INC=-INC=19V

−

(0)

−

µ

A

Frequency band width BW AV=0dB

−

(2)*

−

MHz

IOFA1 terminal

Input current I

-INCL

IOFA1=2.5V -100 -30

−

nA

V

OUTCH

−

(5.3) 5.6

−

V

Output voltage V

OUTCL

−

(0) (50) mV

Output source current I

SOURCE

OUTC=2V

−

-2 -1 mA

Output sink current I

SINK

OUTC=2V 150 300

−

µ

A

6-2. Current Amplifier Block [Current Amp2]

Input offset voltage V

IO

+INC=-INC=

3V to Vcc (-2)

−

(2) mV

Voltage gain A

V

+INC=3V to Vcc

∆

Vin=-100mV (24.25)

25 (27.25) V/V

I

INC1

+INC=-INC=19V

−

(50)

−

µ

A

Input current

I

INC2

CTL-1=0V,

+INC=-INC=19V

−

(0)

−

µ

A

Frequency band width BW AV=0dB

−

(2)*

−

MHz

V

OUTCH

−

(5.3) 5.6

−

V

Output voltage V

OUTCL

−

(0) (50) mV

Output source current I

SOURCE

OUTC=2V

−

-2 -1 mA

Output sink current I

SINK

OUTC=2V 150 300

−

µ

A

7. PWM Comp. Block [PWM Comp.1]

V

TL

Duty cycle = 0% 1.4 1.5

−

V

Threshold voltage V

TH

Duty cycle = 100%

−

2.5 2.6 V

Maximum duty cycle Dtr (RT=47k

Ω

) (95) (97) (99)

%

*

: Standard design value

(10/18)

(Ta = 25

°

C, VCC =19V, VB=0mA, VREF=0mA)

Parameter Symbol

No. Condition

Min. Typ. Max. Unit

8. Output block [OUT]

I

SOURCE

Main side,

Duty

≤

5%,

(t=1/fosc

×

Duty)

−

-400*

−

mA

Output source current

I

SOURCE

Synchronous side,

Duty

≤

5%,

(t=1/fosc

×

Duty)

−

-800*

−

mA

I

SINK

Main side,

Duty

≤

5%,

(t=1/fosc

×

Duty)

−

-400*

−

mA

Output sink current

I

SINK

Synchronous side,

Duty

≤

5%,

(t=1/fosc

×

Duty)

−

-800*

−

mA

R

OH

OUT=-45mA

−

6.5 9.8

Ω

Output ON resistance R

OL

OUT=45mA

−

5 7.5

Ω

t

D1

−

(50)*

−

ns

Dead time t

D2

−

(50)*

−

ns

9. Under Voltage Detection Comparator Block [UV Comp.]

V

TLH

+INUV1=

−

(4.2)

−

V

Threshold Voltage V

THL

+INUV1= (3.97) (4.05) (4.13) V

Hysteresis width V

H

−

(0.15)

−

V

Input bias current I

INUV

+INUV=0V

−

(-100)

−

nA

10. Bias Voltage Block [VB]

Threshold Voltage V

B

−

5.9 6 6.1 V

11. Control Block [CTL]

ON condition V

ON

CTL-1,

CTL-2 terminal 2

−

25 V

OFF condition V

OFF

CTL-1,

CTL-2 terminal 0

−

0.8 V

I

CTLH

CTL -1=CTL-2=5V

−

100 150

µ

A

Input current I

CTLL

CTL -1=CTL-2=0V

−

0 1

µ

A

12. General

Standby current I

CCS

CTL-1=CTL-2=0V

−

0 10

µ

A

I

CC1

CTL-1=CTL-2=5V

−

(5.5) (8.3) mA

I

CC2

CTL-1=5V,

CTL-2=0V

−

(4.0) (6.0) mA

Power supply current

I

CC3

CTL-1=0V,

CTL-2=5V

−

(1.5) (2.3) mA

*

: Standard design value

(11/18)

•

FUNCTIONAL DESCRIPTION

1. DC/DC Converter Unit

(1) Reference voltage block (REF)

The reference voltage generator uses the voltage supplied from the VCC terminal (pin 1) to generate a

temperature compensated, stable voltage (5.0V Typ) used as the reference supply voltage for the IC’s internal

circuitry.

This terminal can also be used to obtain a load current to a maximum of 1 mA from the reference voltage VREF

terminal (pin 21) .

(2) Triangular wave oscillator block (OSC)

The triangular wave oscillator builds the capacitor for frequency setting into, and generates the triangular wave

oscillation waveform by connecting the frequency setting resistor with the RT termi nal (pin 20) .

The triangular wave is input to the PWM comparator on the IC.

(3) Error amplifier block (Error Amp1)

This amplifier detects the output signal from the current detection amplifier (Current Amp2) , compares this to

the +INE1 terminal (pin 7) , and outputs a PWM control signal to be used in controlling the charging current.

A double constant current value can be set together with the charging current control with error amplifier (Error

Amp.2). Therefore, the fail safe control with high safety or more can be achieved.

In addition, an arbitrary loop gain can be set up by connecting a feedback resistor and capacitor between the

FB1 terminal (pin 9) and -INE1 terminal (pin 8) , providing stable phase compensation to the system.

Connecting a soft-start capacitor to the CS terminal (pin 19) prevents rush currents when the IC is turned on.

Using an error amplifier for soft-start detection makes the soft-start time constant, independent of the output

load.

It is possible to correspond also to dynamic control charge (Dynamically-controlled charging) by which the

constant current control and the voltage drop of AC adaptor is detected by combining with current detection

amplifier (Current Amp1).

(4) Error amplifier block (Error Amp2)

This amplifier detects the output signal from the current detection amplifier (Current Amp2) , compares this to

the +INE2 terminal (pin 13) , and outputs a PWM control signal to be used in controlling the charging current.

In addition, an arbitrary loop gain can be set up by connecting a feedback resistor and capacitor between the

FB2 terminal (pin 15) and –INE2 terminal (pin 14) , providing stable phase compensation to the system.

Connecting a soft-start capacitor to the CS terminal (pin 19) prevents rush currents when the IC is turned on.

Using an error amplifier for soft-start detection makes the soft-start time constant, independent of the output

load.

(5) Error amplifier block (Error Amp3)

This error amplifier (Error Amp3) detects the output voltage from the DC/DC converter and outputs the PWM

control signal. External output voltage setting resistors can be connected to the error amplifier inverted input

terminal to set the desired level of output voltage from 1 cell to 4 cells.

In addition, an arbitrary loop gain can be set by connecting a feedback resistor and capacitor from the FB3

terminal (pin 17) to the -INE3 terminal (pin 16) of the error amplifier, enabling stable phase compensation to

the system.

Connecting a soft-start capacitor to the CS terminal (pin 19) prevents rush currents when the IC is turned on.

Using an error amplifier for soft-start detection makes the soft-start time constant, independent of the output

load.

(6) Current detection amplifier block (Current Amp1)

The current detection amplifier (Current Amp1) detects a voltage drop which occurs between both ends of the

output sense resistor (R

S2

) due to the flow of the AC adapter current, using the +INC1 terminal (pin 5) and

-INC1 terminal (pin 4) . Then it outputs the signal amplified by 25 times to the OUTC1 terminal (pin 3).

Moreover, an equal offset voltage to the voltage impressed to the IOFA1 terminal (pin 6) can be set.

(7) Current detection amplifier block (Current Amp2)

The current detection amplifier (Current Amp2) detects a voltage drop which occurs between both ends of the

output sense resistor (R

S1

) due to the flow of the AC adapter current, using the +INC2 terminal (pin 12) and

–INC2 terminal (pin 11) . Then it outputs the signal amplified by 25 times to the OUTC2 terminal (pin 10).

(12/18)

(8) PWM comparator block (PWM Comp.)

The PWM comparator circuit is a voltage-pulse width converter for controlling the output duty of the error

amplifiers (Error Amp1 to Error Amp3) depending on their output voltage.

The PWM comparator circuit compares the triangular wave voltage the lowest generated by the triangular wave

oscillator to the error amplifier output voltage and turns on the external main side output transistor, turns off the

external synchronous rectification side output transistor during the interval

(13/18)

•

SETTING THE CHARGING VOLTAGE

The charging voltage (DC/DC output voltage) can be set by connecting external voltage setting resistors (R1,

R2) to the -INE3 terminal (pin 16). Be sure to select a resistor value that allows you to ignore the on -resistor

(35

Ω

, 1mA) of the internal FET connected to the OUTD terminal (pin 18).

Battery charging voltage : Vo

Vo(V)

=

(R1

+

R2)

/

R2

×

-INE3 (V)

•

METHOD OF SETTING THE CHARGING CURRENT

The charge current (output limit current) value can be set with the voltage at the +INE2 terminal (pin 13).

If a current exceeding the set value attempts to flow, the charge voltage drops according to the set current value.

Battery charge current setting voltage : +INE2

+INE2(V)

=

25

×

Ichg (A)

×

R

S

(Ω

)

•

METHOD OF SETTING THE TRIANGULAR WAVE OSCILLATION FREQUENCY

The triangular wave oscillation frequency can be set by the timing resistor (R

T

) connected the RT terminal (pin

20) .

Triangular wave oscillation frequency : fosc

fosc(kHz)

≅

13500

/

R

T

(k

Ω

)

B

16

18

19

CS

OUTD

-INE3

Vo

R1

R2

4.2V

(14/18)

•

METHOD OF SETTING THE SOFT-START TIME

(1) Setting constant voltage mode soft-start

For preventing rush current upon activation of IC, the IC allows soft-start using the capacitor (C

S

) connected to

the CS terminal (pin 19) .

When CTL-1 terminal (pin 23) is placed under “H” level and IC is activated (VCC

≥

UVLO threshold voltage) , Q2

is turned off and the external soft-start capacitor (CS) connected to the CS terminal is charged at 10

µ

A.

Error Amp3 output (FB3 terminal (pin 17) ) is determined by comparison between the lower voltage of the two

non-inverted input terminals 4.2V and CS terminal voltage) and inverted input terminal voltage

(

-INE3 terminal

(pin 16) voltage). Within the soft-start period (CS terminal voltage < 4.2V), FB3 is determined by comparison

between –INE3 terminal voltage and CS terminal voltage, and DC/DC converter output voltage goes up

proportionately with the increase of CS terminal voltage caused by charging on the soft-start capacitor.

Soft-start time is obtained from the following formula :

Soft-start time : ts (time to output 100 %)

ts

(s)

≅

0.42

×

C

S

(µ

F)

Soft-start circuit

16

19

CS

-INE3

4.2V

Cs

UVLO

Q2

10uA

VREF

≅

4.9V

Soft-start time ts

≅

0V

CS terminal voltage

Error Amp block comparison voltage

to –INE3 voltage

≅

4.2V

(15/18)

(2) Setting constant current mode soft-start

For preventing rush current upon activation of IC, the IC allows soft start using the capacitor (C

S

) connected to

the CS terminal (pin 19) .

When CTL-1 terminal (pin 23) is placed under “H” level and IC is activated (VCC

≥

UVLO threshold voltage), Q2

is turned off and the external soft-start capacitor (C

S

) connected to the CS terminal is charged at 10

µ

A.

Error Amp2 output (FB2 terminal (pin 15) ) is determined by comparison between the lower voltage of the two

non-inverted input terminals

(

+INE2 terminal (pin 13) and CS terminal voltage) and inverted input terminal

voltage

(

-INE2 terminal (pin 14) voltage) . Within the soft start period (CS terminal voltage

<

+INE2), FB2 is

determined by comparison between –INE2 terminal voltage and CS terminal voltage, and DC/DC converter

output voltage goes up proportionately with the increase of CS terminal voltage caused by charging on the

soft-start capacitor. Soft-start time is obtained from the following formula .

Soft-start time : ts (time to output 100 %)

ts(s)

≅

+INE2

/

10

(µ

A)

×

C

S

(µ

F)

Soft-start circuit

14

19

CS

-INE2

Cs

UVLO

Q2

10uA

VREF

13

+INE2

≅

4.9V

Soft-start time ts

≅

0V

CS terminal voltage

Error Amp block comparison voltage

to –INE2 voltage

+INE2

(16/18)

•

PROCESSING WITHOUT USING OF THE SOFT-START FUNCTION

When soft-start function is not used, the CS terminal (pin 19) should be left open.

When no soft-start function is specified

•

PROCESSING WITHOUT USING OF THE UNDER VOLTAGE DETECTION COMPARATOR

When under voltage detection comparator is not used, the +INUV terminal (pin 2) should be made a short

circuit to VCC.

When no under voltage detection comparator is specified

CS

“Open”

19

VCC

1

+INUV

2

(17/18)

• NOTE ON AN EXTERNAL REVERSE-CURRENT PREVENTIVE DIODE

• Insert a reverse-current preventive diode at one of the three locations marked * to prevent reverse current from

the battery.

• When selecting the reverse current prevention diode, be sure to consider the reverse voltage (VR) and reverse

current (I R) of the diode.

VIN

CB

OUT-1

Ichg BATT

Battery

VS

*

29

28

27

Vcc

1

OUT-2

26

A

B

RS1

*

(18/18)

•

PACKAGE DIMENSIONS

(19/18)

The contents of this document are subject to change

without notice. Customers are advised to consult with

FUJITSU sales representatives before ordering.

The information and circuit diagrams in this document

are presented as examples of semiconductor device

applications, and are not intended to be incorporated in

devices for actual use.

Also, FUJITSU is unable to assume responsibility for

infringement of any patent rights or other rights of third

parties arising from the use of this information or circuit

diagrams.

FUJITSU semiconductor devices are intended for use

in standard applications (computers, office automation

and other office equipment, industrial, communications,

and measurement equipment, personal or household

devices, etc.).

CAUTION

:

Customers considering the use of our products in

special applications where failure or abnormal

operation may directly affect human lives or cause

physical injury or property damage, or where extremely

high levels of reliability are demanded (such as

aerospace systems, atomic energy controls, sea floor

repeaters, vehicle operating controls, medical devices

for life support, etc.) are requested to consult with

FUJITSU sales representatives before such use. The

company will not be responsible for damages arising

from such use without prior approval.

Any semiconductor devices have an inherent chance

of failure. You must protect against injury, damage or

loss from such failures by incorporating safety design

measures into your facility and equipment such as

redundancy, fire protection, and prevention of

over-current levels and other abnormal operating

conditions.

If any products described in this document represent

goods or technologies subject to certain restrictions on

export under the Foreign Exchange and Foreign Trade

Law of Japan, the prior authorization by Japanese

government will be required for export of those

products from Japan.

FUJITSU Limited

FUJITSU LINITED

For further information please contact

Japan

FUJITSU LIMITED

Corporate Global Business Support Division

Electronic Devices

Akiruno Technology Center 50 Fuchigami,

Akiruno, Tokyo, 197-0833, Japan

Tel: 81(42) 532-2132

Fax: 81(42) 532-2414

http://www.fujitsu.co.jp/

Asia Pacific

FUJITSU MICROELECTRONICS ASIA

PTE LTD

#05-08, 151 Lorong Chuan

New Tech Park

Singapore 556741

Tel: (65) 281-0770

Fax: (65) 281-0220

http://www.fmap.com.sg/

North and South America

FUJITSU MICROELECTRONICS, INC.

Semiconductor Division

3545 North First Street

San Jose, CA 95134-1804, USA

Tel: (408) 922-9000

Fax: (408) 922-9179

Customer Response Center

Mon. - Fri.: 7 am - 5 pm (PST)

Tel: (800) 866-8608

Fax: (408) 922-9179

http://www.fujitsumicro.com/

Europe

FUJITSU MIKROELEKTRONIK GmbH

Am Siebenstein 6-10

D-63303 Dreieich-Buchschlag

Germany

Tel: (06103) 690-0

Fax: (06103) 690-122

http://www.fujitsu-ede.com/