STC4054 [STMICROELECTRONICS]
800mA Standalone linear Li-Ion Battery charger with thermal regulation; 800毫安独立线性锂离子电池充电器与热调节
| 型号： | STC4054 |
| 厂家： | 
ST |
| 描述： | 800mA Standalone linear Li-Ion Battery charger with thermal regulation |
| 文件： | 总17页 (文件大小：300K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
STC4054
800mA Standalone linear Li-Ion
Battery charger with thermal regulation
Feature summary
■ Programmable charge current up to 800mA
■ No external MOSFET, sense resistors or
blocking diode required
■ Constant current / constant voltage operation
with thermal regulation to maximize charge
rate without risk of overheating
■ Charges single cell li-ion batteries directly from
USB port
TSOT23-5L
■ Preset 4.2V charge voltage with 1% accuracy
■ Automatic recharge
■ Single charge status output pin
■ Charge current monitor output for gas gauging
■ C/10 Charge termination
required and its ThinSOT package make it ideally
suited for portable applications.
■ 25µA supply current in shutdown mode
The STC4054 is designed to work within USB
power specifications. An internal block regulates
the current when the junction temperature
increases, in order to protect the device when it
operates in high power or high ambient
temperature.
■ Low battery voltage detect for precharge
setting
■ Soft-start limits inrush current
■ TSOT23-5L package
Applications
The charge voltage is fixed at 4.2V, and the
charge current limitation can be programmed
using a single resistor connectd between PROG
pin and GND. The charge cycle is automatically
terminated when the current flowing to the battery
is 1/10 of the programmed value. If the external
adaptor is removed, the STC4054 turns off and a
2µA current can flow from the battery to the
device. The device can be put into Shutdown
Mode, reducing the supply current to 25µA. The
device also has a charge current monitor, under
voltage lockout, automatic recharge. The device is
packaged in TSOT23-5L.
■ Cellular telephones
■ PDAs
■ Bluetooth applications
■ Battery-powered devices
Description
The STC4054 is a constant current/constant
voltage charger for single cell Li-Ion batteries. No
external sense resistor or blocking diode is
Order code
Part number
Package
TSOT23-5L
Packaging
STC4054GR
3000 parts per reel
September 2006
Rev. 1
1/17
www.st.com
17
STC4054
Contents
1
2
3
4
5
6
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6.9
Charge cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
V
CC
Power ON pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
CHRG pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
PROG pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Programming charge current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
BAT pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Charge termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Automatic recharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.10 Soft start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.11 Thermal regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.12 Power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.13 Stability considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7
8
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2/17
STC4054
1
Block diagram
Block diagram
Figure 1.
Block diagram
3/17
Pin configuration
STC4054
2
Pin configuration
Figure 2.
Pin connections (top view)
Table 1.
Pln N°
Pin description
Symbol
Note
Open Drain. This pin goes in low impedance when the STC4054 is in precharge or
charge mode
1
2
3
CHRG
GND
BAT
Ground pin
This pin provides an accurate 4.2V output voltage and the charge current to the battery.
Only 2µA reverse current can flow in to the device when in Shutdown mode
Input Supply voltage. The input range is from 4.25V to 6.5V. If VCC<VBAT+30mV the
device enters Shutdown mode and the sinked IBAT is less than 2µA
4
VCC
5
PROG
Charge current program. Charge Current monitor and Shutdown pin
Figure 3.
Application circuit
4/17
STC4054
Maximum ratings
3
Maximum ratings
Table 2.
Symbol
Absolute maximum ratings
Parameter
Value
Unit
VCC
VBAT
Input supply voltage
BAT pin voltage
From -0.3 to 10
From -0.3 to 7
From -0.3 to VCC+0.3
From -0.3 to 7
800
V
V
VPROG
VCHRG
IBAT
PROG pin voltage
V
CHRG pin voltage
V
BAT pin current
mA
µA
IPROG
PROG pin current
800
BAT short circuit duration
Power dissipation
Continuous
Internally Limited
125
PD
TJ
mW
°C
Max junction temperature
Storage temperature range
Operating junction temperature range
TSTG
TOP
-65 to 125
°C
-40 to 85
°C
Table 3.
Symbol
Thermal Data
Parameter
Value
Unit
RthJC
RthJA
Thermal resistance junction-case
Thermal resistance junction-ambient
81
°C/W
°C/W
255
5/17
Electrical characteristics
STC4054
4
Electrical characteristics
Table 4.
Electrical characteristics
(VCC = 5V, CI = 1µF, TJ = -40 to 85° unless otherwise specified) (Note 1).
Symbol
Parameter
Supply voltage
Test
Min.
Typ. Max.
Unit
VCC
4.25
6.5
V
Charge mode, RPROG =10KΩ,
150
150
21
500
300
40
VBAT = 3.5V
Standby mode (charge terminated)
ICC
Supply current (Note 2)
RPROG not
connected
µA
Shutdown mode
VCC < VBAT
17
17
50
40
VCC < VUV
VBAT
Termination output voltage
BAT pin current
VCC = 4.3V to 6.5V, RPROG =10KΩ
Current mode RPROG=10KΩ
Current mode RPROG=2KΩ
Standby mode VBAT=4.2V
4.158
90
4.2
100
500
-2.5
4.242
110
535
-6
V
mA
mA
µA
465
0
IBAT
Shutdown mode (RPROG not
connected), TJ=25°C
1
2
µA
Sleep mode, VCC=0V, TJ=25°C
1
45
2
70
µA
mA
V
IPRE
Pre-charge current
VBAT<2.8V RPROG =2KΩ TJ=25°C
20
2.8
70
R
PROG =10KΩ VBAT falling
Hysteresis RPROG =10KΩ
CC Low to High RPROG =10KΩ
2.9
3.0
VPRE
Pre-charge threshold
100
3.8
130
3.9
mV
V
V
3.7
50
VUV
VCC Undervoltage lockout
Manual shutdown threshold
Hysteresis RPROG =10KΩ
PROG Pin Rising
180
1.21
0.95
300
1.30
1.05
mV
1.15
0.85
VMSD
V
PROG Pin Falling
VCC Low to High TJ=25°C
RPROG =10KΩ
50
5
85
30
120
50
VASD
VCC-VBAT Lockout threshold
C/10 Termination current
mV
VCC High to Low TJ=25°C
RPROG =10KΩ
RPROG =10KΩ
0.1
0.1
1.0
ITERM
threshold (IBAT/IBATC10
)
mA/mA
RPROG =2KΩ
(Note 3)
VPROG
ICHRG
PROG pin voltage
Current Mode RPROG =10KΩ
0.93
8
1.07
35
V
CHRG Pin current weak
pull-down
VCHRG=5V, VBAT=4.3V,
RPROG =10KΩ
20
µA
CHRG Pin pull-down
voltage
VCHRG
I
CHRG=5mA
0.35
200
0.6
V
Recharger battery threshold VFLOAT-VRECHRG, TJ=25°C
voltage
∆VRECHRG
mV
RPROG =10KΩ
6/17
STC4054
Table 4.
Electrical characteristics
Electrical characteristics
(VCC = 5V, CI = 1µF, TJ = -40 to 85° unless otherwise specified) (Note 1).
Symbol
Parameter
Test
Min.
Typ. Max.
Unit
Junction temperature in
constant current mode
TLIM
120
°C
Power Fet “ON” resistance
(Between VCC and BAT)
RON
tSS
600
100
mΩ
µs
Soft-start time
IBAT=0 to IBAT=1000V/RPROG
VBAT High to Low
Recharge comparator filter
time Note 4
TRECHARGE
0.75
400
2
4.5
ms
Termination comparator
filter time Note 4
tTERM
IPROG
Note:
IBAT Falling Below ICHG/10
1000 2500
1
µs
PROG pin pull-up current
µA
1
2
3
4
The STC4054 was tested using a battery simulator and an output capacitor value about
4.7µF
Supply current includes PROG pin current but not include any current delivered to the
battery through the VBAT pin
ITERM is expressed as a fraction of measured full charge current with indicated PROG
resistor
Guaranteed by design
7/17
Typical performance characteristics
STC4054
5
Typical performance characteristics
Figure 4. IBAT vs Supply voltage
Figure 5. VBAT vs VCC
Figure 6. IBAT vs temperature
Figure 7. VPROG vs temperature
Figure 8.
IBAT/IPROG vs temperature
Figure 9. IBAT vs VPROG
8/17
STC4054
Typical performance characteristics
Figure 10. IBAT PROG
/I
vs VCC
Figure 11. VCHRG vs temperature (CHRG pin
output low voltage)
Figure 12. ICHRG vs temperature (CHRG pin
weak pull down current)
Figure 13. Power FET “ON” resistance
Figure 14. IBAT vs VBAT
Figure 15. Recharge battery threshold voltage
vs. temperature
9/17
Application information
STC4054
6
Application information
The STC4054 uses an internal P-Channel MOSFET to work in constant current and
constant voltage method. It is able to provide up to 800mA with a final regulated output
voltage of 4.2V 1% in full temperature range. No blocking diode and sensing resistor are
required. It is also possible to use an USB port as power supply voltage.
6.1
Charge cycle
A charge cycle begins when the voltage at the VCC pin rises above the UVLO threshold
level, the RPROG program resistor of 1% is connected between the PROG pin to GND pin
and when a battery is connected to the charger output. If the battery voltage is below 2.9V,
the charger enters in Trickle Charge mode. In this condition, the device supplies 1/10 of the
programmed charge current to bring the battery voltage up to safe level otherwise the life of
a battery is reduced. If the BAT pin voltage is higher than 2.9V the charger enters in
Constant Current Mode. When the BAT pin voltage is close to the final float voltage (4.2V)
the device enters in Constant Voltage Mode and the charge current begins to decrease. The
charge cycle is terminated when the current drops to 1/10 of the programmed value.
6.2
6.3
6.4
V
Pin
CC
Input Supply Voltage. This pin is used to supplie the device in the range from 4.25V to 6.5V
voltage. A bypass capacitor of 1µF is recommended for use. When VCC value drops of
30mV of the BAT pin voltage, the device enters in Shutdown Mode, dropping IBAT to less
than 2µA.
CHRG pin
This is a flag open drain. It indicates three different status of the output. When the charge is
in progress this pin is pulled low instead at the end of the charge cycle, a weak pull down of
approximately 20µA is connected to the CHRG pin, indicating a present supply power; if the
flag is forced high impedance an under voltage condition is detected.
PROG pin
Charge Current Program, Charge Current Monitor and Shutdown Pin. The charge current is
programmed by connecting a 1% resistor, RPROG, to ground. When the device is charging in
constant current, the value of voltage on this pin is 1.0V. In other conditions, the voltage on
this pin can be used to measure the charge current using the following formula:
IBAT = (VPROG/RPROG)*1000
The PROG pin is used to shut down the device, disconnecting the program resistor from
ground a 1µA current flows to pull the PROG pin high. If the value of this Pin is 1.21V
(shutdown threshold voltage), the device enters Shutdown mode and the input supply
current drops to 25µA. Driving this pin to voltage beyond 2.4V a current of 35µA flows into
the device from PROG pin.
10/17
STC4054
Application information
6.5
Programming charge current
The RPROG resistor is used to set the charge current value. The battery charge current is
1000 times the Prog pin current value. The program resistor and the charge current are
calculated using the following formula:
R
PROG=1000*VPROG/IBAT;
The charge current out of the BAT pin can be monitored through the PROG pin voltage
using the following equation:
IBAT=(VPROG/RPROG)x1000
6.6
Charge status indicator (CHRG)
The charge status output has three different states: Strong pull-down (~10mA), weak pull-
down (20µA) and high impedance. The strong pull-down indicates that the device is
charging the battery. Weak pull-down indicates that VCC meets the UVLO conditions and the
device is ready to charge. The last status high impedance indicates an insufficient voltage is
applied to the VCC pin or the voltage on VCC is less than 100mV above the BAT pin voltage.
6.7
6.8
BAT pin
Charge Current Output pin. It provides charge current to the battery and regulates the final
float voltage to 4.2V. An internal precision resistor is used as a feedback loop to compare
the VO with the reference.
Charge termination
A charge cycle is terminated when the final float voltage is reached consequently the charge
current falls to 1/10th of the programmed value. The charge is over when the PROG pin
voltage falls below 100mV for longer time than tTERM (~1ms). The charge current is latched
off, the device enters in standby mode and the input supply current drops to 200µA.
6.9
Automatic recharge
The device restarts the charge cycle when the battery voltage falls below 4.05V to maintain
the battery capacity value higher than 80%. During the recharge time, the CHRG pin goes
low state.
6.10
Soft start
When a charge cycle starts, a internal soft start circuit minimizes the inrush current. At
starting phase, the charge current ramps from zero to the full scale in a 100µs period time.
11/17
Application information
STC4054
6.11
Thermal regulation
An internal thermal feedback loop reduces the output current if the die temperature attempts
to rise above a present value of approximately 120°C. This feature protects the device from
excessive temperature and allows the user to push the limits of the power handling
capability of a given circuit board without risk of damaging the device.
6.12
Power dissipation
It is very important to use a good thermal PC board layout to maximize the available output
current. The thermal path for the heat generated by the IC is from the die to the copper lead
frame through the package leads and exposed pad to the PC board copper. The PC board
copper is the heat sink. The footprint copper pads should be as wide as possible and
expand out to larger copper areas to spread and dissipate the heat to the surrounding
ambient. Feed through vias to inner or backside copper layers are also useful in improving
the overall thermal performance of the device. Other heat sources on the board, not related
to the device, must also be considered when designing a PC board layout because they will
affect overall temperature rise and the maximum output current.
6.13
Stability considerations
The STC4054 contains two control loops: constant voltage and constant current. The
constant-voltage loop is stable without any compensation when a battery is connected with
low impedance leads. Excessive lead length, however, may add enough series inductance
to require a bypass capacitor of at least 1µF from BAT to GND. Furthermore, a 4.7µF
capacitor with a 0.2Ωto 1Ω series resistor from BAT to GND is required to keep ripple
voltage low when the battery is disconnected.
12/17
STC4054
Package mechanical data
7
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK®
packages. These packages have a Lead-free second level interconnect. The category of
second Level Interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at: www.st.com.
13/17
Package mechanical data
STC4054
TSOT23-5L MECHANICAL DATA
mm.
mils
DIM.
MIN.
TYP
MAX.
1.1
MIN.
TYP.
MAX.
43.3
3.9
A
A1
A2
b
0
0.1
0.7
0.3
0.08
1.0
27.6
11.8
3.1
39.4
19.7
7.9
0.5
C
0.2
D
2.9
2.8
114.2
110.2
63.0
E
E1
e
1.6
0.95
1.9
37.4
e1
L
74.8
0.3
0.6
11.8
23.6
7282780B
14/17
STC4054
Package mechanical data
Tape & Reel SOT23-xL MECHANICAL DATA
mm.
TYP
inch
TYP.
DIM.
MIN.
MAX.
180
MIN.
MAX.
7.086
0.519
A
C
12.8
20.2
60
13.0
13.2
0.504
0.795
2.362
0.512
D
N
T
14.4
3.33
3.27
1.47
4.1
0.567
0.131
0.128
0.0.58
0.161
0.161
Ao
Bo
Ko
Po
P
3.13
3.07
1.27
3.9
3.23
3.17
1.37
4.0
0.123
0.120
0.050
0.153
0.153
0.127
0.124
0.054
0.157
0.157
3.9
4.0
4.1
15/17
Revision history
STC4054
8
Revision history
Table 5.
Revision history
Revision
Date
04-Sep-2006
Changes
1
Initial release.
16/17
STC4054
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