SP7653
Wide Input Voltage Range,
1.3MHz, Buck Regulator
TM
Power
Blox
SP7653
SP7653
FEATURES
DFN PACKAGE
DFNPACKAGE
7mm x 4mm
7mmx4mm
■ 2.5Vto20VStepDownAchievedUsingDualInput
26
P
1
2
3
LX
GND
P
■ OutputVoltagedownto0.8V
GND
1
26
LX
BOTTOM VIEW
P
25
BOTTOMVIEW
GND
LX
■ 3AOutputCapability
P
GND
2
LX
25
Heatsink Pad 1
HeatsinkPad1
P
24
LX
GND
Connect to Lx
■ BuiltinLowRDSON PowerSwitches(40m1 typical)
■ HighlyIntegratedDesign,MinimalComponents
■ 1.3MHzFixedFrequencyOperation
■ UVLODetectsBothV andV
P
GND
3
LX
ConnecttoLx
24
23
GND
4
LX
GND
4
23
LX
5
V
22
FB
V
CC
V
FB
5
22V
CC
6
COMP
21
GND
CC
IN
COMP
21GND
6
Heatsink Pad 2
Co
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ts
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k
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p
G
a
N
d
D
2
UV
7
IN
20
■ OverTemperatureProtection
GND
UVIN 7
ConnecttoGND
20GND
GND
8
19
■ ShortCircuitProtectionwithAuto-Restart
■ WideBWAmpAllowsTypeIIorIIICompensation
■ ProgrammableSoftStart
■ HighEfficiency:Greaterthan95% Possible
■ AsynchronousStart-UpintoaPre-ChargedOutput
■ Small7mmx4mmDFNPackage
■ U.S.Patent#6,922,041
GND
GND
8
19
GND
SS
9
18
BST
SS
18
9
BST
V
10
NC
17
IN
Heatsink Pad 3
Connect to VIN
Heatsinkpad3
V
IN 10
17
NC
V
■ FastTransientResponse
11
IN
LX
16
V
LX
16
IN 11
ConnecttoV
IN
V
12
IN
LX 15
V
15 LX
IN 12
13
V
14
LX
IN
V
14
LX
IN 13
Now Available in Lead Free Packaging
DESCRIPTION
TheSP7653isasynchronousstep-downswitchingregulator optimizedforhighefficiency. Thepartisdesignedtobe
especiallyattractivefordualsupply,12Vto20Vdistributedpowersystemssteppeddownwith5Vusedtopowerthe
controller.ThislowerV voltageminimizespowerdissipationinthepartandisusedtodrivethetopswitch.TheSP7653
CC
isdesignedtoprovideafullyintegratedbuckregulatorsolutionusingafixed1.3MHzfrequency,PWMvoltagemode
architecture.ProtectionfeaturesincludeUnderVoltageLockOut(UVLO),thermalshutdownandoutputshortcircuit
protection.TheSP7653isavailableinthespacesavingDFNpackage.
TYPICAL APPLICATION CIRCUIT
L1 IHLP2525CZER2R2M01
U1
2.2uH, Irate=8A
SP7653
DCR=18m1
1
2
26
25
24
23
22
21
20
19
18
17
16
15
14
PGND
PGND
PGND
GND
VFB
LX
LX
VOUT
3.30V
0-3A
RZ2
CZ2
C3:X5R
CERAMIC
C3
RZ3
1581 ,1%
3
LX
38.3k1 , 1%
1.5nF
4
47uF
6.3V
LX
R1
CP1
5
68.1k1 ,1%
CZ3
820pF
VCC
GND
GND
GND
BST
NC
3.3pF
6
COMP
UVIN
GND
SS
CVCC
2.2uF
7
CF1
100pF
GND2
8
9
R2
21.5k1 ,1%
RBST
10
11
12
13
CSS
22nF
VIN
5.111 ,
DBST
SD101AWS
1%
VIN
LX
VIN
LX
CBST
1uF
VIN
LX
VIN
12V
U2
Fs=1.3MHz
R3
SPX5205
VIN VOUT
GND
200k1 ,1%
C1,C5:
CERAMIC
X5R
1
5
4
Notes:
C1
22uF
16V
C5
22uF
16V
2
3
U1 Bottom-Side Layout should have
three Contacts which are
EN
BYP
isolated from one another: QT-
Drain Contact, QB-Drain Contact and
Controller-GND Contact.
R4
100k1 ,1%
C2
0.1uF
GND
ALL RESISTORS & CAPACITORS ARE SIZE
0603 UNLESS OTHERWISE SPECIFIED.
SP
7
65
3
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Date: ꢀꢀ/20/06
SP7653 Wide Input Voltage Range, ꢀ.3MHz, Buck Regulator
© Copyright 2006 Sipex Corporation
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