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TPS65162

SLVS771 – MAY 2007

TERMINAL FUNCTIONS (continued)

TERMINAL

I/O

DESCRIPTION

NAME

NO.

Internal reference output. Connect 220-nF capacitor directly from this pin to AGND to minimize possible noise

REF

17

O

coupling into the reference of the IC.

Connecting a capacitor from this pin to GND allows setting the delay time between the step down converter

DLY1

18

O

and negative charge pump VGL

19, 20,

NC

Not connected.

40

FBB

21

I

Feedback of the buck converter.

CBOOT

22

I

N-channel MOSFET gate drive voltage for the buck converter. Connect a capacitor from this pin to SWB.

SWB

23, 24

O

Switch pin of the buck converter

PVIN

25, 26

I

Power input for the buck converter.

VIN

27

I

Analog input voltage of the device. This pin should be bypassed with a 1-

µF capacitor for good filtering.

Frequency selection pin. With FREQ=high, the device operates with 750 kHz. With FREQ=low, the device

FREQ

28

I

operates with 500kHz.

Connecting a capacitor from this pin to GND allows setting the delay time between the step down converter

DLY2

29

O

and positive charge pump VGH.

SS

30

O

soft-start of the boost converter. Connect a capacitor from this pin to GND.

VC

31

O

Compensation pin of the boost converter.

EN2

32

I

Enable pin of the boost converter block.

Enable pin of the buck converter and negative charge pump. When this pin is pulled high, the buck converter

EN1

33

I

starts up, and after a delay time set by DLY1, the negative charge pump starts up. A logic high enables the

device and a logic low shut down the device.

PGND1

34

Power ground.

PGND2

35

Ground for boost converter.

PGND3

36

SW

37, 38

I

Switch pin of the boost converter

SWI

39

I

Input of the isolation switch. The SWI pin is connected to internal overvoltage protection comparator.

FB

41

I

Feedback of the boost converter generating Vs

SWO

42

O

Output of the isolation switch

AVIN

43

I

Power input voltage pin for Operational Amplifier. Bypass this pin with a 1-

µF bypass capacitor

NEG2

44

I

Inverting input of Operational Amplifier 2

POS2

45

I

Non inverting input of Operational Amplifier 2

OUT2

46

O

Output of Operational Amplifier 2

OGND

47

Ground for Operational Amplifier.

NEG1

48

I

Inverting input of Operational Amplifier 1

6

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