ST ISB002V1 User Manual
Data brief
For further information contact your local STMicroelectronics sales office.
November 2010 Doc ID 18257 Rev 1 1/4
4
STEVAL-ISB002V1
High efficiency step-down controller demonstration board with
embedded 2 A LDO regulator based on the ST72F324L
Features
■ 1 % measurement accuracy
■ Firmware easily upgradeable
■ Li-ion battery or 2-cell NiMH batteries
■ 5 V supply
■ RoHS compliant
Description
The STEVAL-ISB002V1 is a universal battery
charger (UBC) demonstration board based on the
ST72F324L microcontroller.
The charger used in this demonstration board
uses a modified form of a non-inverting buck-
boost converter to support the charging voltage
requirement for single-cell Li-ion batteries.
The board includes a 3.3 V power supply
generated from a KF33 regulator and a precision
reference voltage generated from the TL1431,
bearing in mind the accuracy requirement for
charging. A status LED is used to show the
charging status.
This demonstration board is capable of charging
single cell Li-ion batteries with in-built NTC or a 2-
cell NiMH battery from a 5 V supply. The firmware
is easily upgradeable and can be modified for
other ST7 microcontrollers depending on
application requirements.
STEVAL-ISB002V1
www.st.com
Circuit schematic STEVAL-ISB002V1
2/4 Doc ID 18257 Rev 1
1 Circuit schematic
Figure 1. Circuit schematic
S
T
M
icroelectro
n
icsP
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tLtd
Plo t no . 1, Kno wl ed ge ParkI II,
G
reater Noida-201308,UP
I
ND
IA
UNIVERSAL_BA TT_CHARGER
L1
75
uH/
1000
m
A
C6
2.2 uF/16V
C5
10
n
F
R19
5k (0. 5%
)
R20
5k
(
0
.
5%)
R8
1k
R22
3.3
k
(0
.
5
%
)
R21
4.7k
R9
470
R24
13
.32
k(
0.
5%
)
C1
470uF
/
16V
VDD
BT2
R2
3
0.5
,1
W
(0
.5%
)
t
RT
1
4.7k/
N
TC
E_FRONT
D5
LED
D6
L
ED
D7
L
ED
D
8
LE
D
R
1
0
47
0
R
1
1
47
0
R12
470
AIN
1
E_FRONT
PWM -1
PW
M
-1
LED1
LED2
LED3
LED
4
AIN8
AIN
1
4
VDD
S1
VD
D
A
I
N
0
2
31
Q
1
2S
T
R1215
R2
100
R
1
33
0
Vsupply
R5
47
0
D1
1
N
582
1
Vin
PWM-2
R4
100
R
6
1k
LED1
PW
M
-2
R3
100(1%)
R17
15k
(
0
.
1
%
)
R
1
6
4.7
k
(
0
.1%)
12
3
D4
TL1431A I Z
V
A
REF
D2
1N5821
1
2
3 4
5 6
7 8
9
1
0
CON1
HEADER5X2
GND
OSC1
VDD
ICCSEL
ICCDATA
I
CCCL
K
RESET
R25
10k
ICC
V+
A
IN
8
V
-
V+
V-
Y1
16MH
z
C
3
33pF
C4
33pF
OSC_
EX
T
OSC
2
1
2
3
J1
OSC
_
E
XT
V+
V
-
V-
Li-IONBATTERY
Ni-MH B
ATT
E
R
Y
Li-IONBATTER
Y
Ni-MH BATTERY
th
BT1
VD
D
AIN8
LED2
LED3
LED
4
AIN0
AIN14
GND
DDV
GN
D
VAREF
RESET
OSC1
OSC
2
R14
10
k(1
%
)
R1
8
4.7
k(
1
%)
ICCSE
L
ICCDATA
ICCCLK
1
23
Q4
2STF1360
C
1
C
2
B
3
E
4
C
5
C
6
Q3
STT
8
18
B
O
1
1
1-
2
1
+
3
GND
4
2
+
5
2
-
6
O2
7
VCC
8
U3
LM258AD
Vo
ut
1
GN
D
2
GN
D
3
NC
4
INH
I
BI
T
5
GN
D
6
GN
D
7
Vi
n
8
U1
KF33
B
DT
R
(HS)/
PB4
30
PDO
31
PD1
32
PB0
28
PF
7
7
PB3
29
PE0
26
DDV
25
OSC1
2
4
OSC2
23
VSS
22
RESET
21
ICCSE
L
20
PA7
19
PA6
18
PA4
17
PE1
27
PC0
8
PC
1
9
PC
2
10
PC
3
11
PC
4
12
PC
5
13
PA
3
16
VAREF
1
VSS
2
AIN8/PF0
3
PF1
4
AI
N
10/
P
F4
5
PF6
6
PC
7
15
PC
6
14
U
2
ST72F324LK2T6
R15
10
k
13
2
Q5
2STR2215
R
7
1k
1
2
3
J2
1
2
J
3
D3
IN4148
Vin
Vin
2
31
Q2
2ST
R
1
21
5
R
1
3
68
Vsuppl
y
C2
100nF (N
ot
To B
e
Mo
un
t
ed
)
AIN1
VDD
F
1
F
U
S
E
2
C7
100nF
A
IN0
C8
100n
F
AIN1
C9
100nF
AIN8
C
1
0
100nF
AIN1
4
2
31
Q6
2STR1215
R26
470
R
2
7
470
1
2
X
1
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