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SP7661 数据表(PDF) 5 Page - Sipex Corporation

部件名 SP7661
功能描述  Wide Input Voltage Range 3A, 600kHz, Buck Regulator
PDF  20 Pages
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制造商  SIPEX [Sipex Corporation]
网页  http://www.sipex.com
标志 SIPEX - Sipex Corporation

SP7661 数据表(HTML) 5 Page - Sipex Corporation

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5
Nov3-06 Rev I
SP766 Wide Input Voltage Range 3A, 600kHz Buck Regulator
© 2006 Sipex Corporation
PIN DESCRIPTION
Pin #
Pin
Name
Description
1-4
PGND Groundconnectionforthesynchronousrectifier.
5,9,
19,20 GND
GroundPin.ThecontrolcircuitryoftheICandlowerpowerdriverarereferencedtothis
pin.Returnseparatelyfromothergroundtracestothe(-)terminalofCOut.
6
VFB
FeedbackVoltageandShortCircuitDetectionpin.Itistheinvertinginputofthe
Error Amplifier and serves as the output voltage feedback point for the Buck
Converter.Theoutputvoltageissensedandcanbeadjustedthroughanexternal
resistordivider.WheneverVFBdrops0.25Vbelowthepositivereference,ashort
circuitfaultisdetectedandtheICentershiccupmode.
7
COMP
OutputoftheErrorAmplifier.Itisinternallyconnectedtotheinvertinginputofthe
PWMcomparator.Anoptimalfiltercombinationischosenandconnectedtothis
pinandeithergroundorVFBtostabilizethevoltagemodeloop.
8
SS
SoftStart.ConnectanexternalcapacitorbetweenSSandGNDtosetthesoftstart
ratebasedonthe10µAsourcecurrent.TheSSpinisheldlowviaa1mA(min)
currentduringallfaultconditions.
0
ISN
Currentsensenegativeinput.Rail-to-railinputforovercurrentdetection.

ISP
Currentsensepositiveinput.Rail-to-railinputforovercurrentdetection.
2
SWN LowersupplyrailfortheGHhigh-sidegatedriver.Connectthispintotheswitching
nodeascloseaspossibletopins23-27.Donotconnectthispintopins14–16.
3
VINP InputconnectiontothehighsideN-channelMOSFET.
14-16,
23-26
LX
ConnectaninductorbetweenthispinandVOut.
7
BST
Highsidedriversupplypin.ConnectBSTtotheexternalboostdiodeandcapacitor
as shown in the TypicalApplication Circuit on page 1.The high side driver is
connectedbetweenBSTpinandSWNpin.
18
VIN
ViNconnectionforinternalLDOandPWMController.
2
UVIN
UVLOinputforViNvoltage.ConnectaresistordividerbetweenViNandUVIN
tosetminimumoperatingvoltage.Useresistorvaluesbelow20kΩtooverride
internalresistordivider.
22
VCC Outputofinternalregulator.MaybeexterinallybiasedifVin<5V.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
BOTTOM VIEW
Heatsink Pad 1
Connect to Lx
Heatsink Pad 2
Connect to GND
Heatsink Pad 3
Connect to VIN
PGND
PGND
GND
VFB
COMP
UVIN
SWN
VIN
LX
LX
LX
LX
VCC
BST
LX
LX
LX
DFN PACKAGE
7mm x 4mm (Option 2)
SP7661
PGND
VINP
SS
ISN
ISP
PGND
GND
GND
GND
Pin 27
Pin 28
Pin 29



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