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SP7655ERL/TR Datasheet

  • SP7655ERL/TR

  • Wide Input Voltage Range, 8Amp 300kHz, Buck Regulator

  • 1791.50KB

  • 16頁

  • SIPEX

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Wide Input Voltage Range, 8Amp
300kHz, Buck Regulator
FEATURES
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SP7655
TM
Power
Blox
DFN PACKAGE
7mm x 4m
m
SP7655
2.5V to 28V Step Down Achieved Using Dual Input
Output Voltage down to 0.8V
8A Output Capability
Built in Low R
DSON
Power Switches (15m typ)
Highly Integrated Design, Minimal Components
300 kHz Fixed Frequency Operation
UVLO Detects Both V
CC
and V
IN
Over Temperature Protection
Short Circuit Protection with Auto-Restart
Wide BW Amp Allows Type II or III Compensation
Programmable Soft Start
Fast Transient Response
High Efficiency: Greater than
95%Possible
Non-synchronous
Start-Up into a Pre-Charged Output
Lead Free, RoHS Compliant Package:
Small 7mm x 4mm DFN
U.S. Patent #6,922,041
P
GND
1
P
GND
2
P
GND
3
GND 4
V
FB
5
COMP 6
UVIN 7
GND 8
SS 9
V
IN
10
V
IN
11
V
IN
12
V
IN
13
Heatsink Pad 3
Connect toVIN
Heatsink Pad 2
Connect to GND
TOP VIEW
Heatsink Pad 1
Connect to Lx
26 LX
25 LX
24 LX
23 LX
2 2 V
CC
21 GND
20 GND
19 GND
18 BST
17 NC
16 LX
15 LX
14 LX
The SP7655 is a synchronous step-down switching regulator optimized for high efficiency. The part is designed to be
especially attractive for dual supply, 12V or 24V distributed power systems stepped down with 5V used to power the
controller. This lower V
CC
voltage minimizes power dissipation in the part and is used to drive the top switch. The
SP7655 is designed to provide a fully integrated buck regulator solution using a fixed 300kHz frequency, PWM voltage
mode architecture. Protection features include UVLO, thermal shutdown and output short circuit protection. The
SP7655 is available in the space saving DFN package
.
DESCRIPTION
TYPICAL APPLICATION CIRCUIT
U1
SP7655
1
PGND
PGND
PGND
GND
VFB
COMP
UVIN
GND
SS
VIN
VIN
VIN
VIN
LX
LX
LX
LX
VCC
GND
GND
GND
BST
NC
LX
LX
LX
26
25
24
23
22
21
20
19
18
17
16
15
14
L1
2.2uH, Irate=8A
CZ2
RZ2
CP1
22pF
2
3
1,000pF 15k ,1%
4
5
6
+5V
VCC
CVCC
2.2uF
C3
47uF
6.3V
RZ3
7.15k
1%
VOUT
3.30V
0-8A
68.1k ,1%
CZ3
150pF
R1
100pF
CF1
ENABLE
7
8
9
DBST
SD101AWS
6,800pF
RSET
21.5k ,1%
(note 2)
CSS
47nF
10
11
12
CBST
VIN
12V
22uF
16V
13
C1
f
s=300Khz
22uF
16V
C4
Notes:
1. U1 Bottom side layout should
have three contacts isolated from
one another: Vin, SWNODE, and GND.
2. RSET=54.48/(Vout-0.8V) KOhms
GND
Rev E: 3/2/07
SP7655 Wide Input Voltage Range 8A, 300kHz, Buck Regulator
漏 2007 Sipex Corporation


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