Fujitsu MB3878 manual PIN Description, Pin No Symbol Descriptions

Page 3

MB3878

PIN DESCRIPTION

Pin No.

Symbol

I/O

Descriptions

 

 

 

 

1

INC2

I

Current detection amplifier (Current Amp. 2) input pin.

 

 

 

 

2

OUTC2

O

Current detection amplifier (Current Amp. 2) output pin.

 

 

 

 

3

+INE2

I

Error amplifier (Error Amp. 2) non-inverted input pin.

 

 

 

 

4

INE2

I

Error amplifier (Error Amp. 2) inverted input pin.

 

 

 

 

5

FB2

O

Error amplifier (Error Amp. 2) output pin.

 

 

 

 

6

VREF

O

Reference voltage output pin.

 

 

 

 

7

FB1

O

Error amplifier (Error Amp. 1) output pin.

 

 

 

 

8

INE1

I

Error amplifier (Error Amp. 1) inverted input pin

 

 

 

 

9

+INE1

I

Error amplifier (Error Amp. 3) non-inverted input pin.

 

 

 

 

10

OUTC1

O

Current detection amplifier (Current Amp. 1) output pin.

 

 

 

 

 

 

 

With IC in standby mode, this pin is left open to prevent loss of current

11

OUTD

O

through output voltage setting resistance. Set CTL pin to “H” level and

 

 

 

OUTD pin to “L” level.

 

 

 

 

12

INC1

I

Current detector amplifier (Current Amp. 1) input pin.

 

 

 

 

13

+INC1

I

Current detector amplifier (Current Amp. 1) input pin.

 

 

 

 

14

CTL

I

Power supply control pin.

Setting the CTL pin low places the IC in the standby mode.

 

 

 

 

 

 

 

15

FB3

O

Error amplifier (Error Amp. 3) output pin.

 

 

 

 

16

INE3

I

Error amplifier (Error Amp. 3) inverted input pin.

 

 

 

 

17

RT

Triangular-wave oscillation frequency setting resistor connection pin.

 

 

 

 

18

VCC

Power supply pin for reference power supply and control circuit.

 

 

 

 

19

VH

O

Power supply pin for FET drive circuit (VH = Vcc 5 V).

 

 

 

 

20

OUT

O

High-side FET gate drive pin.

 

 

 

 

21

VCC (O)

Output circuit power supply pin.

 

 

 

 

22

CS

Soft-start capacitor connection pin.

 

 

 

 

23

GND

Ground pin.

 

 

 

 

24

+INC2

I

Current detection amplifier (Current Amp. 2) input pin.

 

 

 

 

3

Image 3
Contents Features DescriptionPackage TOP View PIN AssignmentPIN Description Pin No Symbol DescriptionsBlock Diagram Parameter Parameter Symbol Conditions Rating Unit Min MaxAbsolute Maximum Ragings Recommended Operating ConditionsParameter Symbol Pin Conditions Value Unit Min Typ Electrical CharacteristicsOutd = 1 mA 100 On resistor Parameter Symbol Pin Conditions Value Unit Min Typ Max200 Amplifier block Output source Typical Characteristics Triangular wave oscillator Deg Functional Description Bias voltage block VH PWM comparator block PWM CompOutput block OUT Control block CTLMethod of Setting the Triangular Wave Oscillator Frequency Setting the Charging VoltageMethod of Setting the Charging Current Method of Setting the SOFT-START TimeAC Adaptor Voltage Detection Operation Timing DiagramVcco OUT VIN Batt Processing Without USE of the CS PINOUTC2 Application ExampleParts No Batt Reference DataVCC Vishay Siliconix MB3878PFV Usage PrecautionsOrdering Information Part number Package RemarksIndex Package DimensionFujitsu Limited