Fujitsu MB3887 manual PIN Description, Pin No Symbol Descriptions

Page 4

MB3887

■PIN DESCRIPTION

Pin No.

Symbol

I/O

Descriptions

 

 

 

 

1

−INC2

I

Current detection amplifier (Current Amp2) input terminal.

 

 

 

 

2

OUTC2

O

Current detection amplifier (Current Amp2) output terminal.

 

 

 

 

3

+INE2

I

Error amplifier (Error Amp2) non-inverted input terminal.

 

 

 

 

4

−INE2

I

Error amplifier (Error Amp2) inverted input terminal.

 

 

 

 

5

FB2

O

Error amplifier (Error Amp2) output terminal.

 

 

 

 

6

VREF

O

Reference voltage output terminal.

 

 

 

 

7

FB1

O

Error amplifier (Error Amp1) output terminal.

 

 

 

 

8

−INE1

I

Error amplifier (Error Amp1) inverted input terminal

 

 

 

 

9

+INE1

I

Error amplifier (Error Amp1) non-inverted input terminal.

 

 

 

 

10

OUTC1

O

Current detection amplifier (Current Amp1) output terminal.

 

 

 

 

 

 

 

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

11

OUTD

O

of current through output voltage setting resistance.

 

 

 

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

 

 

 

 

12

−INC1

I

Current detection amplifier (Current Amp1) input terminal.

 

 

 

 

13

+INC1

I

Current detection amplifier (Current Amp1) input terminal.

 

 

 

 

 

 

 

Power supply control terminal.

14

CTL

I

Setting the CTL terminal at “L” level places the IC in the standby

 

 

 

mode.

 

 

 

 

15

FB3

O

Error amplifier (Error Amp3) output terminal.

 

 

 

 

16

−INE3

I

Error amplifier (Error Amp3) inverted input terminal.

 

 

 

 

17

RT

Triangular-wave oscillation frequency setting resistor connection

terminal.

 

 

 

 

 

 

 

18

VCC

Power supply terminal for reference power supply and control circuit.

 

 

 

 

19

VH

O

Power supply terminal for FET drive circuit (VH = VCC − 6 V) .

 

 

 

 

20

OUT

O

External FET gate drive terminal.

 

 

 

 

21

VCC (O)

Output circuit power supply terminal.

 

 

 

 

22

CS

Soft-start capacitor connection terminal.

 

 

 

 

23

GND

Ground terminal.

 

 

 

 

24

+INC2

I

Current detection amplifier (Current Amp2) input terminal.

 

 

 

 

4

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Contents Description FeaturesPackage MB3887 PIN Assignment TOP ViewPin No Symbol Descriptions PIN DescriptionBlock Diagram Parameter Symbol Conditions Rating Unit Min Max Absolute Maximum RatingsParameter Symbol Conditions Value Unit Min Typ Recommended Operating ConditionsParameter Sym Pin Conditions Electrical CharacteristicsBol Min Typ Parameter Sym Pin Conditions Value Unit Bol Min Typ Max Parameter Sym Pin Conditions Value Unit Bol Min Typ OUT = −45 mA Output block Resistor Typical Characteristics Triangular wave oscillation frequency fOSC kHz Error amplifier gain and phase vs. Frequency Gain a Power dissipation vs. Ambient temperature Functional Description Power PWM comparator block PWM CompOutput block OUT Control block CTLSetting the Charging Voltage Method of Setting the Charging CurrentMethod of Setting the Triangular Wave Oscillation Frequency Soft-start block SoftMethod of Setting the SOFT-START Time Operation Timing Diagram AC Adaptor Voltage DetectionProcessing Without Using the Current AMP Connection when Current Amp is not usedProcessing Without Using of the Error AMP Connection when Error Amp is not usedProcessing Without Using of the CS Terminal Connection when soft-start time is not specifiedApplication Example At 4 cellParts List Parts NoReference Data Batt Vbatt mV Ta = +25 C, VIN = 19 Batt = 12 Ω Ordering Information Usage PrecautionsPart number Package Remarks Package Dimension IndexFujitsu Limited
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