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SP7653ER/TR Datasheet

  • SP7653ER/TR

  • Wide Input Voltage Range, 1.3MHz,Buck Regulator

  • 206.61KB

  • 12頁(yè)

  • SIPEX

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廬
Preliminary
SP7653
PowerBlox
Blox
FEATURES
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TM
Wide Input Voltage Range, 1.3MHz,
Buck Regulator
SP7653
DFN PACKAGE
7mm x 4mm
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 to VIN
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
2.5V to 20V Step Down Achieved Using Dual Input
Output Voltage down to 0.8V
3A Output Capability
Built in Low R
DSON
Power Switches (40 m鈩?typical)
Highly Integrated Design, Minimal Components
1.3MHz 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
Now Available in Lead Free Packaging
DESCRIPTION
The SP7653 is a synchronous step-down switching regulator optimized for high efficiency. The part is designed to be
especially attractive for dual supply, 12V to 20V 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 SP7653
is designed to provide a fully integrated buck regulator solution using a fixed 1.3MHz frequency, PWM voltage mode
architecture. Protection features include Under Voltage Lock Out (UVLO), thermal shutdown and output short circuit
protection. The SP7653 is available in the space saving DFN package
.
TYPICAL APPLICATION CIRCUIT
U1
SP7653
1
P GND
P GND
P GND
GND
V FB
COMP
UV IN
GND
SS
V IN
V IN
V IN
V IN
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
2
3
L1: IHLP2525CZER2R2M01
2.2uH, Irate =8A
DCR=18mOhm
C3
CERAMIC
X5R
C3
47uF
6.3 V
CZ2
1.5nF
C P1
RZ2
38.3k, 1%
4
5
6
7
8
9
RZ3
158,1%
CZ3
820pF
VOUT
3.30V
0-3A
R1
68.1k,1%
3.3pF
CF1
100pF
CSS
22nF
C VCC
2.2uF
GND2
R BST
5.11, 1%
C BST
1uF
D BST
SD101AWS
R2
21.5k,1%
10
11
12
VIN
12V
C1,C5
CERAMIC
X5R
C1
22uF
16V
C5
22uF
16V
13
R3
200k,1%
fs=1.3MHz
1
2
3
U2
SPX5205
VIN
GND
EN
BYP
4
VOUT
5
Notes:
U1 Bottom-Side Layout should have three
Contacts which are isolated from one
another: QT Contact, QB Drain Contact, and
Controller GND Contact.
ALL RESISTORS & CAPACITORS SIZE 0603 UNLESS
OTHERWISE SPECIFIED.
GND
R4
100k,1%
C2
0.1uF
Date: 03/25/05
SP7653 Wide Input Voltage Range, 1.3MHz, Buck Regulator
漏 Copyright 2005 Sipex Corporation
1

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