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SP7650_06 Datasheet

  • SP7650_06

  • Wide Input Voltage Range 3A, 300kHz, Buck Regulator

  • 16頁

  • SIPEX

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Wide Input Voltage Range 3A,
300kHz, Buck Regulator
FEATURES
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SP7650
Power
Blox
1
P
GND
TM
SP7650
2.5V to 28V Step Down Achieved Using Dual Input
Output Voltage down to 0.8V
3A Output Capability
Built in Low R
DSON
Power Switches (40 m 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
Asynchronous Start-Up into a Pre-Charged Output
Small 7mm x 4mm DFN Package
U.S. Patent #6,922,041
LX 26
25
LX
P
GND
1
24
LX
P
GND
2
P
GND
3
LX 23
V
FB
GND 21
COMP
GND 20
UVIN
GND 19
GND
BST 18
SS
NC 17
V
IN
LX 16
V
IN
LX 15
V
IN
LX 14
V
IN
DFN PACKAGE
7mm
SP7650
x 4mm
DFN PACKAGE
7mm x 4mm
BOTTOM VIEW
P
LX
2
26
GND
BOTTOM
1
Heatsink Pad
VIEW
P
LX
3
25
GND
Connect to Lx
Heatsink Pad 1
Connect to Lx
Pin 27
GND
4
24 LX
5
23
FB
V
LX
6
2 2 V
CC
COMP
UV
IN
7
21 GND
GND
GND
8
20
19 GND
SS
V
CC
GND 4
22
5
Heatsink Pad 2
6
Connect to GND
Heatsink pad 2
Connect to GND
7
Pin 28
8
9
9
Heatsink Pad 3
10
Connect to V
IN
11
12
13
Heatsink pad 3
Connect to V
IN
Pin 29
18 BST
10 V
IN
17 NC
11 V
IN
16 LX
12 V
IN
15 LX
13 V
IN
14 LX
Now Available in Lead Free Packaging
DESCRIPTION
The SP7650 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
SP7650 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
SP7650 is available in the space saving DFN package
.
TYPICAL APPLICATION CIRCUIT
U1
SP7650
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=4.78A
CZ2
1,000pF
RZ2
15k ,1%
2
3
4
5
6
7
8
9
RZ3
47uF
6.3V
CP1
22pF
100pF
+5V VCC
CVCC
2.2uF
C3
7.15k ,1%
VOUT
3.3V
0-3A
68.1k ,1%
CZ3
R1
150pF
CF1
ENABLE
DBST
SD101AWS
RSET
21.5k ,1%
(note 2)
CSS
47nF
10
11
12
CBST
VIN
12V
C1
13
6800pF
fs=300Khz
22uF
16V
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)
(KOhm)
GND
Date: 2/16/06
Date: /5/06
SP7650 Wide Input Voltage Range 3A, 300kHz, Buck Regulator
SP7650 Wide Input Voltage Range 3A, 300kHz, Buck Regulator
漏 Copyright 2006 Sipex Corporation
漏 Copyright 2006 Sipex Corporation
1


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