ST ST7LIT15BY0 User manual

February 2008 Rev 1 1/21
UM0497
User manual
USB Li-Ion battery charger evaluation board
Introduction
This document explains the functioning of the USB-based single cell Li-Ion battery charger
evaluation board which consists of a ST7260E2-based low-speed USB controller and a
battery charger based on the ST7LIT15BY0.
The evaluation 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 the TL1431programmable voltage reference, 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 evaluation board such that any external low-speed USB controller
can control the operation of the charger, hence this system can be used with any low-speed
USB controller.
The charger used in the board utilizes a modified form of non-inverting buck-boost converter
to support the charging voltage requirement for single cell Li-Ion battery. This converter is
explained in more detail in AN2390.
This evaluation board represents a complete USB-based portable battery charging system
for a single cell Li-Ion battery, such as those used in MP3 players.
There are separate ICP connectors provided on the board to reprogram the USB controller
and charger controller.
www.st.com

Contents UM0497
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Contents
1 Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1 Package contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Hardware description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2.1 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2.2 Current limiter (ST890B) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2.3 Precision supply for the charger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2.4 Preferential power selector circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2.5 Supply generation circuit for the USB controller . . . . . . . . . . . . . . . . . . . 6
1.2.6 Supply shutdown control circuit for the USB controller . . . . . . . . . . . . . . 6
1.2.7 Jumpers and connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2.8 DC-DC converter circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2 Running the evaluation board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1 Connecting to the PC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2 Connecting the Li-Ion battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.3 Battery charging status monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.4 Controlling/changing the charging parameters . . . . . . . . . . . . . . . . . . . . . 11
3 Using the external USB controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4 Using the charger in standalone mode . . . . . . . . . . . . . . . . . . . . . . . . . 14
5 Warning/limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6 Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Appendix A Schematic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.1 USB battery charger BOM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

UM0497 List of figures
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List of figures
Figure 1. USB Li-Ion evaluation board (STEVAL-ISB003V1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Figure 2. Reference voltage generation for the charger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 3. Power selector circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 4. Supply generation circuit for the USB controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 5. Connector J2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 6. Clock selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 7. DC-DC converter circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 8. Enumeration result . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 9. USB Li-Ion evaluation board HID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 10. Li-Ion battery 3-pin connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 11. Schematic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Getting started UM0497
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1 Getting started
1.1 Package contents
The USB Li-Ion battery charger evaluation board includes the following items:
●Hardware content:
– One evaluation board
●Documentation:
–Usermanual
1.2 Hardware description
Figure 1 below shows the snapshot of the evaluation board.
Figure 1. USB Li-Ion evaluation board (STEVAL-ISB003V1)
1.2.1 Power supply
The evaluation board is powered by a USB bus directly. As only 100 mA current is available
by default from the USB bus, the charger is inititally kept in shutdown mode. After proper
enumeration is done by the USB controller to increase the supply current limit to 500 mA,
the charger switches to ON to start charging the battery.
1.2.2 Current limiter (ST890B)
To provide additional information about the USB supply current, a current limiter (ST890B) is
kept in series of the USB supply. There is a STATUS LED (D3) connected with the FAULT
pin of this current limiter.

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This LED glows HIGH whenever the supply current increases from 500 mA. In the
evaluation board, the current limiter is used only to show the status of whether the current
limit is crossed or not, but it is not used to cut off the power supply.
1.2.3 Precision supply for the charger
Figure 2 shows circuit for the precision supply for the charger system. Here TL1431AI,
which provides 0.25% accurate reference voltage, is used to generate a precise voltage
supply for the charger system.
Figure 2. Reference voltage generation for the charger
With the help of this precision supply, we can easily achieve the 1% accuracy target which is
mandatory for Li-Ion charger systems.
1.2.4 Preferential power selector circuit
Figure 3 shows a preferential power selector circuit which is used to select the source power
supply for the USB controller.
Figure 3. Power selector circuit
This selector circuit works as follows. Whenever the USB supply (VBUS) is available, it is
used as the source supply. Battery power is only used when the USB supply is not available.

Getting started UM0497
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1.2.5 Supply generation circuit for the USB controller
Figure 4 shows L6920-based supply generation circuit for the USB controller. USB_SUPPLY
is the output voltage and VREG (output voltage of the power selector circuit as in
Section 1.2.4) is the input voltage of this circuit. The output voltage USB_SUPPLY is
programmable. In the evaluation board it is set at 4.5 voltage and depends on the ratio
R4/R9. Please refer to the L6920 datasheet for more details.
Figure 4. Supply generation circuit for the USB controller
LED (D4) is used to show the status of the input supply availability which glows whenever
the input supply falls below a certain threshold (determined by the voltage at LBI).
1.2.6 Supply shutdown control circuit for the USB controller
The STM1061 as shown in Figure 4 is used to control the shutdown operation of the L6920.
It puts the L6920 in shutdown mode whenever the input supply voltage falls below 2.5 V.
1.2.7 Jumpers and connectors
The following important jumpers control the operation of the evaluation board and are
explained according to their applications:
J2, JP1, JP3, JP12, JP13, JP14 and JP16 are used to select between the USB controller
available on the evaluation board and the external USB controller.

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The role of each individual jumpers is as follows:
●JP1: to connect USB_SUPPLY to the VDD pin of the USB controller
●JP3: to connect USBVCC to USBDM through a 1.5 kΩresistor.
●JP12: to monitor the availability of the VBUS signal.
●JP15: to connect to the SHDN_CHG pin of the charger. This is used to put the charger
in shutdown mode until proper enumeration is done.
●JP13, JP14: These are used to connect to the status pin
●JP16: to connect the USB supply pin to the demonstration board supply pin. Pin 1 of
this jumper is the USB supply pin (USB_VDD) and pin 2 is the demonstration supply pin
(VBUS). For the standalone charger, please connect the external supply to pin 2 of
JP16.
●J2: As shown in Figure 5, this is a 7-pin connector and can be used to connect to the
external USB controller.
Figure 5. Connector J2
Warning: You can connect to only one USB controller at a time. If you
want to use an external USB controller, you must open all the
jumpers (JP1, JP3, JP12, JP13, JP14 and JP15) required by
the USB controller.
J5 and J7: These are 3-pin connectors and are used to select between the ICC clock and
resonator clock. J5 is used for selecting the clock source for the USB controller (ST7260E2)
available in the evaluation board and J7 is used to select the clock source of the charger IC
(ST7LIT15BY0). As shown in Figure 6, if we short pin 1 and 2 then the external resonator is
used as the clock source and if we short pin 2 and pin 3, ICC clock is used as the clock
source. In general we short pin 1 and pin 2.
Figure 6. Clock selector

Getting started UM0497
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1.2.8 DC-DC converter circuit
Figure 7 shows the circuit diagram of the DC-DC converter circuit which is controlled by the
two PWM signals coming from the charger controller ST7LIT15BY0.
Figure 7. DC-DC converter circuit
This DC-DC converter provides power to the single cell Li-Ion (3-pin battery pack) based on
the battery voltage, current and temperature measurements. Please refer to AN2390 for
more details regarding this DC-DC converter circuit.

UM0497 Running the evaluation board
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2 Running the evaluation board
After ensuring that all the jumpers are connected correctly as explained in the previous
section, the evaluation board is ready to be used.
2.1 Connecting to the PC
As soon as you connect the USB connector to the evaluation board, you should find the
evaluation board enumerated as an HID device as shown Figure 8.
Figure 8. Enumeration result
And if you check the properties of all these HID devices, you should find the property of one
HID device as shown in Figure 9.

Running the evaluation board UM0497
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Figure 9. USB Li-Ion evaluation board HID
This ensures that the evaluation board is connected properly to the USB and now ready to
be used. Now we can proceed to the next steps.
2.2 Connecting the Li-Ion battery
The evaluation board is not provided with any specific slot in order to avoid making it
package specific. Instead a 3-pin connector is provided on the evaluation board as shown in
Figure 10.
Figure 10. Li-Ion battery 3-pin connector
You can either solder a particular slot to this connector and then connect the battery in that
slot, or if you are directly connecting the battery to the connector, please ensure that the
battery is properly connected as improper connection may affect the accuracy of the analog
measurement,thus affecting the overall accuracy of the charging.

UM0497 Running the evaluation board
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2.3 Battery charging status monitoring
There are two LEDS available (D8 and D9) on the evaluation board. Table 1 explains the
behavior of these status LEDs according to the charging status.
Note: An error condition occurs for following reasons:
Temperature (heat or cold condition)
Short-circuit
Bad battery when the impedance of the battery becomes very low.
Note: For the condition due to a bad battery, if impedance of the battery becomes very high, then
current does not flow through the battery. In this case charging is stopped and the status
LED shows that charging is done.
2.4 Controlling/changing the charging parameters
The variables inTable 2 are used to control different charging parameters.
Table 1. Charging LED status
SL NO Charging status Red LED (D8) Green LED (D9)
1 Battery not present / Idle OFF OFF
2 Charging ongoing ON OFF
3 Charging done OFF ON
4 Error in charging ON ON
Table 2. Controlling/ changing the charging parameters
File name: Bc.h
Sl No Parameter
name Function Formulae Comments
1LION_VF_H To define constant voltage threshold to fix the constant
voltage level.
For example:
X = 597 for 4.2 V
threshold.
2 LION_VFAST Voltage to switch from pre-charge
level
For example:
X = 469 for 3.3V pre-
charge threshold.
3 LION_VFAIL Not used
4 LION_VF_L Not used
5LION_VSC
Used along with LION_TFAIL to
define bad battery condition
For example:
X = 213 for 1.5V threshold.
6 LION_VSAT Voltage to switch from pre-charge
level
For example:
X = 469 for 3.3V pre-
charge threshold.
Xthreshold
23.6}⋅{
----------------------------
⎝⎠
⎛⎞
1024⋅=
)
]
Xthreshold
23.6}⋅{
----------------------------
⎝⎠
⎛⎞
1024⋅=
)
]
Xthreshold
23.6}⋅{
----------------------------
⎝⎠
⎛⎞
1024⋅=
)
]
Xthreshold
23.6}⋅{
----------------------------
⎝⎠
⎛⎞
1024⋅=
)
]

Running the evaluation board UM0497
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7 LION_ICONST Current level during constant
current charging
For example:
Y = 120 for 300 mA
charging current.
8 LION_ITRI_1 Constant current level during pre-
charging phase
For example:
Y = 20 for 50 mA pre-
charging current.
9 LION_ITRI_2 Not used
10 LION_IFAIL Short-circuit current threshold
For example:
Y = 140 for 350 mA short
circuit current.
11 LION_ISAT Current threshold to end charging
For example:
Y = 18 for 45 mA short
circuit current.
12 LION_VHEAT_
UP Heat indicator threshold
For example:
Z = 80 for 45 Celsius
degree temperature (Here
R1 is in kΩ).
13 LION_VHEAT_
DOWN Cold indicator threshold
For example:
Z = 195 for 0 Celsius
degree temperature (Here
R1 is in kΩ).
14 LION_TFAIL Used with LION_VSC
15 LION_TEXP Expiration in minutes
For example:
W = 150 for a 5-hour time
expiration.
Table 2. Controlling/ changing the charging parameters (continued)
File name: Bc.h
YCurrentThre
2.5
-----------------------------------
=-
YCurrentThre
2.5
-----------------------------------
=-
YCurrentThre
2.5
-----------------------------------
=-
YCurrentThre
2.5
-----------------------------------
=-
ZR1
10kΩR1+()}
-----------------------------------
⎩
⎨
⎧
=.256
ZR1
10kΩR1+()}
-----------------------------------
⎩
⎨
⎧
=.256
W = value in minutes)
(expected time expiration
2

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3 Using the external USB controller
Before using the external USB controller, you must remove all jumpers (JP1, JP3, JP12,
JP13, JP14 and JP15). After that you need to do the connections as mentioned in
Section 1.2.7. To use the external USB controller in order to control the charging operation,
you must do the following steps:
1. First disable the SHDN_CHG pin by making it low to switch off the charger.
2. Do the proper enumeration of the USB cell to increase the current limit up to 500 mA.
3. During battery charging, as the USB controller is also being powered by a USB, the
power consumption of the system should be kept at less than 150 mA, otherwise we
may not achieve the targeted 250 mA charging current.
4. After completing steps 1, 2 and 3, enable the SHDN_CHG pin to high to enable
charging operation.
5. Connect the battery.
6. Start monitoring the status of the battery charging by monitoring the status pin ST1 and
ST2. Using these status pins, you can control the activity of the external USB controller
to minimize the current consumption while the battery is being charged.
7. Disable the SHDN_CHG pin again by making it low to reduce any consumption by the
charger.
8. Follow steps 1 to 7 to charge another battery.

Using the charger in standalone mode UM0497
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4 Using the charger in standalone mode
You can use the charger available in this evaluation board in standalone mode as well. In
standalone, it provides an option of developing a low-cost battery charger which is capable
of charging a single cell Li-ion battery from a 5 V power supply.
To use this evaluation board in standalone mode, do the following steps:
1. Select the external power supply (5 V, 1 A) by connecting the positive pin of this supply
to pin 2 of jumper JP16 (see Section 1.2.7) and the negative pin to ground (see
Figure 11: Schematic).
2. Remove jumpers JP1, JP3, JP12, JP13, JP14 and JP15 to isolate the USB controller.
3. Connect the SHDN_CHG pin (pin 2 of JP15) to VBUS (pin 2 of JP16) to enable the
charger operation (see Figure 11: Schematic).
The charger is now enabled and ready to be used in standalone mode.
If you connect the battery as mentioned in Section 2.2, then its presence is detected within a
few seconds and the charging operation starts.
Again as mentioned in Section 2.3, LED8 and LED9 are used to show the charging status.

UM0497 Warning/limitation
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5 Warning/limitation
The limitations/warnings in using this evaluation board are as follows:
1. The charging current is limited to 300 mA value using the USB supply. You can use an
external supply for increasing the charging current by using it in standalone mode as
mentioned in Section 4.
2. There is no protection for reverse battery polarity connection, but it can be provided
according to customer requirements.
6 Reference
1. AN2390: A Flexible Universal Battery Charger.

Schematic UM0497
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Appendix A Schematic
Figure 11. Schematic
5 5
4 4
3 3
2 2
1 1
D D C C B B A A
USBDP
BATTOUT
I_AIN3
V_AIN1
SW1_PWM
SW2_PWM
RESET_LITE1BX
ST1
V_AIN1 T_AIN2 I_AIN3
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
Title Size Document Number Rev Date: Sheet of
USB BATTERY CHARGER _V1 1
USB BATTERY CHARGER
11Monday, January 07, 2008
Title Size Document Number Rev Date: Sheet of
USB BATTERY CHARGER _V1 1
USB BATTERY CHARGER
11Monday, January 07, 2008
Title Size Document Number Rev Date: Sheet of
USB BATTERY CHARGER _V1 1
USB BATTERY CHARGER
11Monday, January 07, 2008
3 PIN BATTERY FOOTPRINT
IMS SYATEM LAB
FOR 1A TRACK
500mA
DC TO DC
pwr select
USB-B
OPTIONAL OPTIONAL
R31 100k R31 100k
C15 100nF C15 100nF
1 2
R13 10k R13 10k
C8 100nF C8 100nF
1 2
C9 100nF C9 100nF
1 2
R29 56 R29 56
J9 CON1 J9 CON1
1
C24 100nF C24 100nF
C13 100nF C13 100nF
1 2
SW1
RESET
SW1
RESET
1 2
R19 10k(0.1%) R19 10k(0.1%)
C20 33pF C20 33pF
Q6 2STR1215 Q6 2STR1215
R26
0.5/1W(1%)
R26
0.5/1W(1%)
R10 10k R10 10k
R6 16k R6 16k
D8LED D8LED
C18 33pF C18 33pF
C23 200uF C23 200uF
C4 100nF C4 100nF
Q7
2STR1215
Q7
2STR1215
R24 82 R24 82
Y1
16MHZ
Y1
16MHZ
J3 CON12 J3 CON12
1
2
3
4
5
6
7
8
9
10
11
12
R4 0 R4 0
SW2
RESET
SW2
RESET
1 2
D9 LED D9 LED
J4 CON12 J4 CON12
1
2
3
4
5
6
7
8
9
10
11
12
Q5 2STR1215 Q5 2STR1215
R20 100 R20 100
J12 CON1 J12 CON1
1
C3 4.7uF/25V C3 4.7uF/25V
C7
100nF
C7
100nF
1 2
C21 33pF C21 33pF
R18 330 R18 330
JP16JP16
1 2
Q9
2STR1215
Q9
2STR1215
R11 1k R11 1k
J6 CON10A J6 CON10A
1 2 3 4 5 6 7 8 910
C5 100nF C5 100nF
1 2
R41 100k R41 100k
R25 5k(0.5%) R25 5k(0.5%)
C6 1uF/16V C6 1uF/16V
R38 10k R38 10k
Q8
2STR1215
Q8
2STR1215
J7 CON3 J7 CON3
1
2
3
C17 100nF C17 100nF
1 2
R33 10k R33 10k
R42 10k R42 10k
JP13JP13
1 2
R3 18k R3 18k
R404k7 R404k7
C11 100nF C11 100nF
1 2
D5
TL1431AIZ
D5
TL1431AIZ
C12
470uF/16V
C12
470uF/16V
TP1TP1
1
J10 CON1 J10 CON1
1
D1 1N5817 D1 1N5817
R36 10k R36 10k
JP15JP15
1 2
Y2
12MHZ
Y2
12MHZ
L1
10uH
L1
10uH
1 2
JP12JP12
1 2
C19 10nF C19 10nF
12
R321k R321k
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
8PA7(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
L2 33uH L2 33uH
C2 47uF/16V C2 47uF/16V
R16 50 R16 50
R43 POT R43 POT
13
2
R37 1M R37 1M
R17 4k4(0.1%) R17 4k4(0.1%)
R9 0 R9 0
R341kR341k
J5 CON3 J5 CON3
1
2
3
R28 10k R28 10k
C22 10nF C22 10nF
12
Q2 2STR2215 Q2 2STR2215
J8 CON10A J8 CON10A
1 2 3 4 5 6 7 8 910
D3 LED D3 LED
JP1JP1
1 2
JP3JP3
1 2
C1 47uF/16V C1 47uF/16V
D7 1N5819 D7 1N5819
J1 CON4 J1 CON4
4 3 2 1
56
C10 100nF C10 100nF
R7 10k R7 10k
C16 33pF C16 33pF
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
R30
4k7
R30
4k7
D4 LED D4 LED
R23 470 R23 470
U2 L6920D U2 L6920D
FB 1
LBI
2
LBO 3
REF
4
SHDN 5
GND
6
LX 7
OUT 8
Q3 2STR2215 Q3 2STR2215
R8 100k R8 100k
JP14JP14
1 2
R27 1KR27 1K
R15 1k R15 1k
R2
100k
R2
100k
Q4
2STR1215
Q4
2STR1215
R35 4k7 R35 4k7
J11 CON1 J11 CON1
1
D6 1N5819 D6 1N5819
R39
4k7
R39
4k7
Q1 2STR2215 Q1 2STR2215
U1
ST890BDR
U1
ST890BDR
IN
1
IN
2
ON
3
GND
4SET 5
OUT 6 OUT 7
FAULT 8
R14 1k R14 1k
M1 STT3PF30L M1 STT3PF30L
U3 STM1061N25WX6F U3 STM1061N25WX6F
OUT 1
VSS 2
VCC 3
R21 1k5 R21 1k5
BT1 BATTERY BT1 BATTERY
12
3
C14 100nF C14 100nF
1 2
R22 5k(0.5%) R22 5k(0.5%)
J2 CON8 J2 CON8
1 2 3 4 5 6 7 8
D2 1N5817 D2 1N5817
R5 200k R5 200k

UM0497 Schematic
17/21
6.1 USB battery charger BOM
Table 3. Bill of materials
Index Qty Reference Value/generic part
number Package Manufact.
Manufacturer’s
ordering code/
orderable part
number
Suppl. Supplier‘s ordering
code
1 2 C1,C2 47 µF/16 V Electrolytic
cylindrical Any
2 1 C3 4.7 µF/25 V Electrolytic
cylindrical Any
312
C4,C5,C7,
C8,C9,C1
0,C11,C1
3,C14,C1
5,C17,C2
4
100 nF 805 Any
4 1 C6 1 µF/16 V Electrolytic
cylindrical
5 1 C12 470 µF/16 V Electrolytic
cylindrical Any
64
C16,C18,
C20,C21 33 pF 805 Any
7 2 C19,C22 10 nF 805 Any
8 1 C23 200 µF Electrolytic
cylindrical Any
9 2 D1,D2 1N5817 DO41 ST 1N5817
10 4 D3,D4,D8,
D9 LED Axial LED Any
11 1 D5 TL1431AIZ TO-92 ST TL1431AIZ
12 2 D6,D7 1N5819 DO41 ST 1N5819
13 7
JP1,JP3,
JP12,
JP13,
JP14,
JP15,
JP16
Jumper SIP-2 Any
14 1 J1 CON4 SIP-4 Any
15 1 J2 CON8 SIP-8 Any
16 2 J3,J4 CON12 SIP-12 Any
17 2 J5,J7 CON3 SIP-3 Any
18 2 J6,J8 CON10A Box
header Any
19 4 J9,J10,
J11, J12 CON1 Mounting holes Any

Schematic UM0497
18/21
20 1 L1 10 µH Axial
inductor Any
21 1 L2 33 µH Axial
inductor Any
22 1 M1 STT3PF30L SOT23-6L ST STT3PF30L
23 3 Q1,Q2,Q3 2STR2215 SOT-23 ST 2STR2215
24 6 Q4,Q5,Q6 ,Q7,Q8,
Q9 2STR1215 SOT-24 ST 2STR1215
25 4 R2,R8,
R31,R41 100 kΩ805 Any
26 1 R3 18 kΩ805 Any
27 2 R4,R9 0 (optional) 805 Any
28 1 R5 200 kΩ805 Any
29 1 R6 16 kΩ805 Any
30 8
R7,R10,
R13,R28,
R33,R36,
R38,R42
10 kΩ805 Any
31 6 R11,R14, R15,R27,
R32,R34 1 kΩ805 Any
32 1 R16 50 805 Any
33 1 R17 4k4(0.1%) 805 RS
Components 215-3112
34 1 R18 330 805 Any
35 1 R19 10 kΩ(0.1%) 805 RS
Components 215-3493
36 1 R20 100 805 Any
37 1 R21 1k5 805 Any
38 2 R22,R25 5 kΩ(0.5%) 805 RS
Components 215-3162
39 1 R23 470 805 Any
40 1 R24 82 805 Any
41 1 R26 0.5/1 W(1%) RES Axial Vishay CPF1R500000FL
42 1 R29 56 805 Any
43 4 R30,R35,
R39,R40 4k7 805 Any
Table 3. Bill of materials (continued)
Index Qty Reference Value/generic part
number Package Manufact.
Manufacturer’s
ordering code/
orderable part
number
Suppl. Supplier‘s ordering
code

UM0497 Schematic
19/21
44 1 R37 1M 805 Any
45 1 R43 POT Top notch
3296 Any
46 2 SW1,SW2 Reset Push
button Any
47 1 TP1 Test point Single
berg pin Any
48 1 U1 ST890BDR SO-8 ST ST890BDR
49 1 U2 L6920D TSSOP8 ST L6920D
50 1 U3 STM1061N25WX6F SOT23-3 ST STM1061N25WX6F
51 1 U4 ST72F60E2M1 SO24 ST ST72F60E2M1
52 1 U5 ST7FLIT15BY0M6 SO16 ST ST7FLIT15BY0M6
53 1 Y1 16 MHz Crystal
oscillator Any
54 1 Y2 12 MHz Crystal
oscillator Any
Table 3. Bill of materials (continued)
Index Qty Reference Value/generic part
number Package Manufact.
Manufacturer’s
ordering code/
orderable part
number
Suppl. Supplier‘s ordering
code

Revision history UM0497
20/21
7 Revision history
Table 4. Document revision history
Date Revision Changes
07-Feb-2008 1 Initial release