SP7655
Wide Input Voltage Range, 8Amp
300kHz, Buck Regulator
TM
Power
Blox
SP7655
DFN PACKAGE
7mm x 4mm
FEATURES
■ 2.5Vto28VStepDownAchievedUsingDualInput
■ OutputVoltagedownto0.8V
■ 8AOutputCapability
P
GND
1
2
3
26
25
24
23
LX
LX
LX
TOP VIEW
P
GND
Heatsink Pad 1
Connect to Lx
P
GND
■ BuiltinLowR PowerSwitches(15m 1 typ)
DSON
■ HighlyIntegratedDesign,MinimalComponents
■ 300kHzFixedFrequencyOperation
■ UVLODetectsBothV andV
GND
4
5
LX
V
FB
22 V
CC
COMP
UVIN
GND
SS
CC
IN
21 GND
20 GND
6
7
Heatsink Pad 2
Connect to GND
■ OverTemperatureProtection
■ ShortCircuitProtectionwithAuto-Restart
■ WideBWAmpAllowsTypeIIorIIICompensation
■ ProgrammableSoftStart
8
9
19
18
GND
BST
V
IN 10
17
16
NC
LX
Heatsink Pad 3
■ FastTransientResponse
V
IN 11
Connect toV
IN
■ HighEfficiency:Greaterthan95%Possible
■ Non-synchronousStart-UpintoaPre-ChargedOutput
■ Lead Free, RoHS Compliant Package: Small7mmx4mmDFN
■ U.S.Patent#6,922,041
V
IN 12
15 LX
14
V
IN 13
LX
DESCRIPTION
TheSP7655isasynchronousstep-downswitchingregulator optimizedforhighefficiency. Thepartisdesignedtobe
especiallyattractivefordualsupply,12Vor24Vdistributedpowersystemssteppeddownwith5Vusedtopowerthe
controller. This lower V voltageminimizespowerdissipationinthepartandisusedtodrivethetopswitch.The
CC
SP7655isdesignedtoprovideafullyintegratedbuckregulatorsolutionusingafixed300kHzfrequency,PWMvoltage
mode architecture. Protection features include UVLO, thermal shutdown and output short circuit protection. The
SP7655isavailableinthespacesavingDFNpackage
.
TYPICAL APPLICATION CIRCUIT
U1
SP7655
L1
VOUT
3.30V
0-8A
1
2
26
25
24
23
22
21
20
19
18
17
16
15
14
PGND
PGND
PGND
GND
VFB
LX
LX
2.2uH, Irate=8A
RZ3
7.15k1
1%
RZ2
CZ2
C3
47uF
6.3V
3
LX
+5V
VCC
15k1,1%
1,000pF
4
LX
R1
CP1
22pF
CZ3
150pF
5
68.1k1,1%
VCC
GND
GND
GND
BST
NC
6
CVCC
2.2uF
COMP
UVIN
GND
SS
7
CF1
ENABLE
8
RSET
21.5k1,1%
(note 2)
100pF
DBST
9
10
11
12
13
SD101AWS
VIN
CSS
47nF
VIN
LX
CBST
6,800pF
VIN
LX
VIN
LX
VIN
12V
fs=300Khz
C1
C4
Notes:
22uF
22uF
16V
16V
1. U1 Bottom side layout should
have three contacts isolated from
one another: Vin, SWNODE, and GND.
GND
2. RSET=54.48/(Vout-0.8V) KOhms
Rev E: 3/2ꢀ/07
SP7655 Wide Input Voltage Range 8A, 300kHz, Buck Regulator
© 2007 Sipex Corporation
ꢀ