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SP7651ER Datasheet

  • SP7651ER

  • Wide Input Voltage Range 3Amp 900kHz Buck Regulator

  • 15頁

  • SIPEX

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Solved by
SP7651
Wide Input Voltage Range 3Amp
900kHz Buck Regulator
TM
FEATURES
鈥?/div>
2.5V to 20V Step Down Achieved Using Dual Input
鈥?/div>
Output Voltage down to 0.8V
鈥?/div>
3A Output Capability (Up to 5A with Air Flow)
鈥?/div>
Built in Low R
DSON
Power FETs (40 m鈩?typ)
鈥?/div>
Highly Integrated Design, Minimal Components
鈥?/div>
900 kHz Fixed Frequency Operation
鈥?/div>
UVLO Detects Both V
CC
and V
IN
鈥?/div>
Over Temperature Protection
鈥?/div>
Short Circuit Protection with Auto-Restart
鈥?/div>
Wide BW Amp Allows Type II or III Compensation
鈥?/div>
Programmable Soft Start
鈥?/div>
Fast Transient Response
鈥?/div>
High Efficiency: Greater than 92% Possible
鈥?/div>
Asynchronous Start-Up into a Pre-Charged Output
鈥?/div>
Small 7mm x 4mm DFN Package
鈥?/div>
U.S. Patent #6,922,04
SP7651
DFN PACKAGE
7mm x 4mm
LX
LX
LX
LX
V
CC
GND
GND
GND
BST
NC
LX
LX
LX
26
25
24
23
22
21
20
19
18
17
16
15
14
BOTTOM VIEW
Heatsink Pad 1
Connect to Lx
1
2
3
4
5
6
7
8
9
10
P
GND
P
GND
P
GND
GND
V
FB
COMP
UVIN
GND
SS
V
IN
V
IN
V
IN
V
IN
Pin 27
Heatsink Pad 2
Connect to GND
Pin 28
So
Heatsink Pad 3
Connect to V
IN
11
12
13
Pin 29
The SP7651 is a high voltage synchronous step-down switching regulator optimized for high efficiency. The part
is designed to be especially attractive for dual supply, 2V step down with 5V used to power the controller. This
lower V
CC
voltage minimizes power dissipation in the part. The SP765 is designed to provide a fully integrated
buck regulator solution using a fixed 900kHz frequency, PWM voltage mode architecture. Protection features
include UVLO, thermal shutdown and output short circuit protection. The SP765 is available in the space saving
7mm X 4mm DFN package
.
DESCRIPTION
TYPICAL APPLICATION CIRCUIT
U
SP7651

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
2
20
9
8
7
6
5
4
L
4.7uH, Irate=3.87A
Cz2
Rz2
CP
2
3
4
5
6
Rz3
22uF
6.3V
,000pF 5k,1%
22pF
00pF
+5V
VCC
CVCC
2.2uF
C3
7.5k鈩?
1%
Cz3
68.k鈩?%
R
VOUT
3.3V
0-3A
50pF
CF
ENABLE
CSS
5nF
7
8
9
0

2
DBST
SD101AWS
CBST
2.5k鈩?%
(note 2)
RSET
VIN
12V
C
3
6800pF
fs=900Khz
22uF
16V
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)
Notes:
GND
Rev J: 3/4/07
SP765 Wide Input Voltage Range 3A, 900kHz, Buck Regulator
漏 Copyright 2007 Sipex Corporation


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