SP7662
Wide Input Voltage Range
TM
12A, 300kHz, Buck Regulator
Power
Blox
SP7662
FEATURES
DFN PACKAGE
7mm x 4mm (Option 2)
■ 4.75V to 22V Input Voltage Range using Single Supply
■ 3V to 22V Input Voltage Range using Dual Supply
■ ±ꢀ% 0.8V Reference
26
25
24
23
22
21
P
P
1
2
3
LX
LX
LX
GND
BOTTOM VIEW
GND
GND
■ ꢀ2A Output Capability
Heatsink Pad 1
Connect to Lx
P
■ Current Limiting using Inductor DCR
■ Built in Low RDS(ON) Power Switches
■ 300 kHz Fixed Frequency Operation
■ Over Temperature Protection
P
4
5
LX
GND
Pin 27
GND
V
CC
6
7
UV
V
FB
IN
GND
GND
■ Short Circuit Protection with Auto-Restart
■ Wide BW Amp Allows Type II or III Compensation
■ Programmable Soft Start
COMP
SS
20
19
18
17
Heatsink Pad 2
Connect to GND
8
9
GND
ISN
V
IN
■ Fast Transient Response
Pin 28
10
BST
LX
■ꢀ HighꢀEfficiency:ꢀGreaterꢀthanꢀ95% Possible
■ꢀ Nonsynchronous Start-Up into a Pre-Charged Output
■ꢀ AvailableꢀinꢀRoHSꢀCompliant,ꢀLeadꢀFreeꢀPackaging:
Small 7mm x 4mm DFN
Heatsink Pad 3
Connect to VINP
16
11 ISP
12
13
SWN
VINP
LX 15
14
Pin 29
LX
■ U.S. Patent #6,922,04ꢀ
DESCRIPTION
TheꢀSP7662ꢀisꢀaꢀsynchronousꢀstep-downꢀswitchingꢀregulatorꢀꢀoptimizedꢀforꢀhighꢀefficiency.ꢀꢀTheꢀpartꢀisꢀdesignedꢀ
for use with a single 4.75V to 22V single supply or 3V to 22V input if an external Vcc is provided. The SP7662 pro-
videsꢀaꢀfullyꢀintegratedꢀbuckꢀregulatorꢀsolutionꢀusingꢀaꢀfixedꢀ300ꢀkHzꢀfrequency,ꢀPWMꢀvoltageꢀmodeꢀarchitecture.ꢀ
Protection features include UVLO, thermal shutdown, output current limit and short circuit protection. The SP7662
is available in the space saving DFN package.
TYPICAL APPLICATION CIRCUIT
VIN
ꢀ
12Vin (9.6V - 16V)
VOUT
ꢀ
3.30V, 0-12A
Lꢀ, SC50ꢀ8-2R7M
2.7uH, 4.ꢀ mOhm
C3
22uF
C2
Cꢀ
LX
22uF 22uF
ꢀ
3
R3
5.ꢀꢀk
R4
5.ꢀꢀk
ꢀ
RZ3
453
Rꢀ
ꢀ0k
2
C4
R9
ISP
0.ꢀuF
6ꢀ.9k
ISN
C5
C6
GND
ꢀ
2
26
25
24
23
22
2ꢀ
20
ꢀ9
ꢀ8
ꢀ7
ꢀ6
ꢀ5
ꢀ4
PGND
PGND
PGND
PGND
GND
VFB
LX
ꢀ00uF ꢀ00uF
LX
LX
CZ3
2200pF
VFB
RZ2
3
ꢀ
4
CZ2
Uꢀ
4
CVCC
4.7uF
SP7662
VFB
LX
ꢀ0nF
4.02k
GND
R2
3.ꢀ6k
5
VCC
UVIN
GND
GND
VIN
BST
LX
ꢀ00pF
CPꢀ
6
NC
7
COMP
SS
CSS 47nF
CFꢀ
ꢀ00pF
8
9
GND
ISN
ꢀ0
ꢀꢀ
ꢀ2
ꢀ3
RBST
5.ꢀ
ISP
C9 6.8nF
SDꢀ0ꢀAWS
DBST
SWN
VIN
LX
22nF
CBST
LX
ISN
ISP
LX
LX
Rs2
Cs2
Rsꢀ
ꢀ Ohm
Csꢀ
2.2nF
ꢀ Ohm
2.2nF
Mar ꢀ-07 Rev AJ
SP7662 Wide Input Voltage Range ꢀ2A, 300kHz Buck Regulator
© 2007 Sipex Corporation
ꢀ