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SP7651ER/TR Datasheet

  • SP7651ER/TR

  • Wide Input Voltage Range 3A, 900kHz, Buck Regulator

  • 12頁

  • SIPEX

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廬
Advanced
SP7651
Wide Input Voltage Range 3A, 900kHz, Buck Regulator
FEATURES
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2.5V to 20V Step Down Achieved Using Dual Input
Output Voltage down to 0.8V
3A Output Capability (Up to 5A with Air Flow)
Built in Low R
DSON
Power FETs (40 m鈩?typ)
Highly Integrated Design, Minimal Components
900 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 92% Possible
Asynchronous Start-Up into a Pre-Charged Output
Small 7mm x 4mm DFN Package
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
SP7651
DFN PACKAGE
7mm x 4mm
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
Now Available in Lead Free Packaging
DESCRIPTION
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, 12V step down with 5V used to power the controller. This lower V
CC
voltage minimizes power dissipation in the part. The SP7651 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 SP7651 is available in the space saving 7mm X 4mm DFN package
.
TYPICAL APPLICATION CIRCUIT
U1
SP7651
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
4.7uH, Irate=3.87A
CZ2
RZ2
CP1
22pF
2
3
RZ3
C3
22uF
6.3V
7.15k,1%
1,000pF 15k,1%
VOUT
3.3V
0-3A
R1
68.1k,1%
4
5
6
CZ3
150pF
CVCC
2.2uF
CF1
100pF
ENABLE
7
8
9
DBST
SD101AWS
RSET
21.5k,1%
(note 2)
CSS
15nF
10
11
12
CBST
6800pF
VIN
12V
C1
22uF
16V
13
+5V VCC
fs=900Khz
Notes:
1. U1 Bottom-Side Layout should
has three contacts isolated from
one another Vin SWNODE and GND
2. RSET=54.48/(Vout-0.8V)
(KOhm)
GND
Date: 08/25/04
SP7651 Wide Input Voltage Range 3A, 900kHz, Buck Regulator
漏 Copyright 2004 Sipex Corporation
1

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