SP7655
Evaluation Board Manual
Easy Evaluation for the
SP7655ER 24V Input, 0 to 8A
Output Synchronous Buck
Converter
Built in Low Rds(on) Power FETs
UVLO Detects Both VCC and VIN
High Integrated Design, Minimal
Components
High Efficiency: 85%
Feature Rich: UVIN, Programmable
Softstart, External VCC Supply and
Output Dead Short Circuit Shutdown
SP7655EB SCHEMATIC
U1
SP7655
L1 IHLP-2525CZ-01-2R2MTR
1
26
PGND
LX
VOUT
2.2uH, Irate=8A
2
25
3.30V
0-8A
PGND
LX
LX
RZ2
CZ2
DCR=10.4mOhm
RZ3
3
4
24
23
22
21
20
19
18
17
16
15
14
PGND
GND
VFB
COMP
UVIN
GND
SS
C3
8.66k,1%
7.68k,1%
2,200pF
R1
68.1k,1%
LX
47uF
CP1
5
6.3V
CZ3
120pF
VCC
GND
GND
GND
BST
NC
6
15pF
CVCC
2.2uF
7
fs=300Khz
CF1
GND2
C3
8
100pF
DBST
9
R2
21.5k,1%
10
11
12
13
CERAMIC
1210
CSS
SD101AWS
VIN
47nF
VIN
LX
X5R
VIN
LX
CBST
1uF
VIN
LX
VIN
24V
U2
R3
SPX5205
VIN VOUT
GND
D1
499k,1%
C1,C4
Notes:
1
2
3
5
4
CERAMIC C1
C4
U1 Bottom-Side Layout should
three Contacts which
isolated from one of another,
& QB Drain Contact
MMSZ4678T1
3.3uF
50V
1210
Y5V
3.3uF
50V
Vz=12V
EN
BYP
R4
C2
0.1uF
100k,1%
GND
Controller GND
All resistor & capacitor
0603 unless other wise
Date: 2/01/05
SP7655 Evaluation Manual
Copyright 2004 Sipex Corporation