Data brief
For further information contact your local STMicroelectronics sales office.
May 2011 Doc ID 14769 Rev 2 1/4
4
STEVAL-ISB003V1
Demonstration board on USB Li-Ion battery charger
based on the microcontroller ST7260E2
Features
■Can be powered from USB connector
■Available to work stand alone powered from
external power supply (5 V, 1 A)
■Max. charging current 250 mA
Description
This demonstration board is an USB based single
cell Li-Ion battery charger which consists of the
ST7260E2-based low-speed USB controller and
the ST7LIT15BY0-based battery charger.
This board includes a power selector circuit to
select the appropriate power supply source and a
step-up converter circuit based on the L6920
device to provide a fixed output voltage to the
USB controller. The power supply for the battery
charger controller is generated from TL1431
keeping in mind the accuracy requirement for
charging. An additional current-limiter is also
included in series with a USB power supply to
show any incorrect behavior using a status LED.
A provision is provided on demonstration board
such that any external low-speed USB controller
can control the charger operation, hence this
system can be used with any low-speed USB
controller.
The charger used in this demonstration board
utilizes a modified form of non-inverting
buckboost converter to support the charging
voltage requirement for single cell Li-Ion battery.
This converter is explained in more detail in
AN2390.
This demonstration board system is a complete
USB-based portable system which uses a single
cell Li-Ion in MP3 players for example.
There are separate ICP connectors provided on
the evaluation board to reprogram the USB
controller and charger controller.
STEVAL-ISB003V1
www.st.com
Block diagram STEVAL-ISB003V1
2/4 Doc ID 14769 Rev 2
1 Block diagram
Figure 1. USB battery charger
4
USBDP
BATTOUT
I_A IN3
V_AIN1
SW1_PWM
SW2_PWM
RESET_LITE1BX
ST1
V_AIN1
T_AIN2
I_A IN3
ST2
SW1_PWM
SW2_PWM
OSC1_LITE
OSC2_LITE
ICCDATA_LITE
ICCCLK_LITE
RESET_LITE1BX
OSC1_LITE
OSC2_LITE
OSCEXT_LITE
BATTOUT
ICC_DATA
OSC_IN
RESET_ST7260
VPP_7260
USBDM
USBDP
ICC _CLK
OSCOUT
ICC_DATA
ICC_CLK
VPP_7260
OSC_EXT OSC_IN
RESET_ST7260
VPP_7260
OSCOUT
OSC_EXT
RESET_LITE1BX
USBDM
USBDP
ST2
ST1
USBDM
OSCEXT_LITE
ICCDATA_LITE
ICCCLK_LITE
RESET_ST7260
SHDN_CHG
SHDN_CHG
VBUS_MON
VBUS_MON
ST2
ST1
SHDN_CHG
T_AIN2
USBDM
USB VDD
VDD_LITE
VBUS
VBUS
VDD_LITE
VBUS
VBUS
USB_SUPPLY
VBUS
USB_SUPPLY
USB_SUPPLY
VDD_LITE
VREG
USB_SUPPLY
VREG
VREG
USB_SUPPLY
VBUS
VDD_LITE
VBUS
VDD_LITE
VDD_LITE
3 PIN BATTERY
FOOTPRINT
FOR 1A TRACK
500mA
DC TO DC
pwr select
USB-B
OPTIONAL
OPTIONAL
D3
LED
D3
LED
D1
1N5817
D1
1N5817
Q4
2STR1215
Q4
2STR1215
J10
CON1
J10
CON1
1
BT1
BATTERY
BT1
BATTERY
1
2
3
C16
33pF
C16
33pF
J8
CON10A
J8
CON10A
1
2
34
5
6
7
8
9
10
R14
1k
R14
1k
C3
4.7uF/25V
C3
4.7uF/25V
C19 10nF
C19 10nF
1
2
U1
ST890BDR
U1
ST890BDR
IN
1
IN
2
ON
3
GND
4
SET 5
OUT 6
OUT 7
FAULT 8
R9
0
R9
0
Q2
2STR2215
Q2
2STR2215
Q1
2STR2215
Q1
2STR2215
R5
200k
R5
200k
J4
CON12
J4
CON12
1
2
3
4
5
6
7
8
9
10
11
12
TP1
TP1
1
R26
0.5/1W(1%)
R26
0.5/1W(1%)
Q6
2STR1215
Q6
2STR1215
J9
CON1
J9
CON1
1
D2
1N5817
D2
1N5817
Q7
2STR1215
Q7
2STR1215
J2
J2
1
2
3
4
5
6
7
8
R2
100k
R2
100k
C5
100nF
C5
100nF
1
2
C20
33pF
C20
33pF
C12
470uF/16V
C12
470uF/16V
D9
LED
D9
LED
R19
10k(0.1%)
R19
10k(0.1%)
C22 10nF
C22 10nF
1
2
J6
CON10A
J6
CON10A
12
3
4
5
6
78
9
10
R11
1k
R11
1k
21P
J2
1P
J
1
2
D5
TL1431AIZ
D5
TL1431AIZ
C17
100nF
C17
100nF
12
J7
CON3
J7
CON3
1
2
3
R15
1k
R15
1k
C4
100nF
C4
100nF
R21 1k5
R21 1k5
R27 1K
R27 1K
C23
200uF
C23
200uF
41PJ41PJ
12
R29
56
R29
56
Q9
2STR1215
Q9
2STR1215
C18
33pF
C18
33pF
R7
10k
R7
10k
D8
LED D8
LED
C9
100nF
C9
100nF
1
2
C11
100nF
C11
100nF
12
R404k7
R404k7
L1
10uH
L1
10uH
1
2
C8
100nF
C8
100nF
1
2
R39
4k7
R39
4k7
C10
100nF
C10
100nF
R28
10k
R28
10k
R13 10k
R13 10k
Y2
12MHZ
Y2
12MHZ
R23
470
R23
470
D4
LED
D4
LED
J5
CON3
J5
CON3
1
2
3
R8
100k
R8
100k
Q8
2STR1215
Q8
2STR1215
SW1
RESET
SW1
RESET
1
2
D6
1N5819
D6
1N5819
R17
4k4(0.1%)
R17
4k4(0.1%)
R22
5k(0.5%)
R22
5k(0.5%)
J1
CON4
J1
CON4
4
3
2
1
5
6
61PJ61P
J
12
J12
CON1
J12
CON1
1
C13
100nF
C13
100nF
1
2
R38
10k
R38
10k
R18
330
R18
330
D7
1N5819
D7
1N5819
C21
33pF
C21
33pF
R3
18k
R3
18k
R6
16k
R6
16k
31P
J31P
J
1
2
R37
1M
R37
1M
C1
47uF/16V
C1
47uF/16V
3
PJ 3
P
J
1
2
U3
STM1061N25WX6F
U3
STM1061N25WX6F
OUT 1
VSS 2
VCC 3
C6
1uF/16V
C6
1uF/16V
Q3
2STR2215
Q3
2STR2215
SW2
RESET
SW2
RESET
1
2
R10
10k
R10
10k
C15
100nF
C15
100nF
1
2
R20
100
R20
100
R25
5k(0.5%)
R25
5k(0.5%)
C24
100nF
C24
100nF
Q5
2STR1215
Q5
2STR1215
R4
0
R4
0
M1
STT3PF30L
M1
STT3PF30L
J11
CON1
J11
CON1
1
R30
4k7
R30
4k7
51PJ51PJ
12
U4 ST72F60E2M1
U4 ST72F60E2M1
VDD
1
OSCOUT
2
OSCIN
3
VSS
4
TDO/PC1
5
RDI/PC0
6
RESET
7
IT7/PB6(10mA)
8
Vpp/TEST
9
PB3/(10mA)
10
PB2/10(mA)
11
USBOE/PB1(10mA)
12
PB0(10mA) 13
PA7/OCMP2/IT4 14
PA5/ICAP2/IT2 15
PA4/ICAP1/IT1 16
PA3/EXTCLK 17
PA2(25mA)/SCL/ICCCLK 18
PA1(25mA)/SDA/ICCDATA 19
PA0/MCO 20
Vssa 21
USBDP 22
USBDM 23
USBVcc 24
R42
10k
R42
10k
R43
POT
R43
POT
1
3
2
R36
10k
R36
10k
R341k R34
1k
C7
100nF
C7
100nF
1
2
R41
100k
R41
100k
R16 50
R16 50
C14
100nF
C14
100nF
1
2
J3
CON12
J3
CON12
1
2
3
4
5
6
7
8
9
10
11
12
Y1
16MHZ
Y1
16MHZ
R24
82
R24
82
1PJ1PJ
1
2
C2
47uF/16V
C2
47uF/16V
R33
10k
R33
10k
R35
4k7
R35
4k7
L2
33uH
L2
33uH
U5 ST7FLIT15BY0M6
U5 ST7FLIT15BY0M6
VSS
1
VDD
2
RESET
3
COMPIN+SS/AIN0/PB0
4
SCK/AIN1/PB1
5
MISO/AIN2/PB2
6
MOSI/AIN3/PB3
7
COMPIN-/CLKIN/AIN4/PB4
8
PA7(HS)COMPOUT 9
PA6/MCO/ICCCLK/BREAK 10
PA5(HS)/ATPWM3/ICCDATA 11
PA4(HS)/ATPWM2 12
PA2(HS)ATPWM0 13
PA0(HS)/LTIC 14
OSC2/PC1 15
OSC1/CLKIN/PC0 16
R31
100k
R31
100k
U2
L6920D
U2
L6920D
FB 1
LBI
2
LBO
3
REF
4
SHDN
5
GND
6
LX 7
OUT 8
R321k R321k
AM00615v1
STEVAL-ISB003V1 Revision history
Doc ID 14769 Rev 2 3/4
2 Revision history
Table 1. Document revision history
Date Revision Changes
04-Jun-2008 1 Initial release.
20-May-2011 2 Updated cover page.
STEVAL-ISB003V1
4/4 Doc ID 14769 Rev 2
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