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PDF WS4508S Data sheet ( Hoja de datos )
| Número de pieza | WS4508S | |
| Descripción | Single Li-ion Battery Charger | |
| Fabricantes | WillSEMI | |
| Logotipo |  |
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WS4508S
1000mA, Single Li-ion Battery Charger
WS4508S
Http//:www.sh-willsemi.com
Descriptions
The WS4508S is a complete constant-current /
constant voltage linear charger for single cell
Lithium-Ion batteries. No external sense resistor is
needed, and no blocking diode is required due to the
internal MOSFET architecture. Thermal feedback
regulates the charge current to limit the die
temperature during high power operation or high
ambient temperature. The charge voltage is fixed at
4.2V, and the charge current can be programmed
externally with a single resistor.
SOP-8L-EP
CE CHGb STDBYb BAT
87 65
The WS4508S automatically terminates the charge
cycle when the charge current drops to 1/10 the
programmed value after the final float voltage is
reached.
When the input supply (wall adapter or USB supply) is
removed, the WS4508S automatically enters a low
current state, dropping the battery drain current to less
than 0.5uA. The WS4508S can be put into shutdown
mode, reducing supply current to 45uA (Typ.).
Expose PAD
GND
1 234
TEMP PROG GND VCC
Pin configuration (Top view)
8765
The WS4508S is available in SOP-8L-EP package.
Standard product is Pb-Free.
WS4508S
YYWW
Features
Programmable Charge Current Up to 1000mA
Over-Temperature Protection
Under Voltage Lockout Protection
Automatic Recharge Threshold 4.05V(Typ.)
Charge Status Output Pin
2.9V Trickle Charge Threshold
Soft-Start Limits Inrush Current
1 234
WS4508S = Device Code
YY = Year
WW = Week
Order information
Device
Package
Shipping
Applications
Wireless phone
MP3/MP4 Player
Bluetooth device
WS4508S-8/TR SOP-8L-EP 2500/Reel&Tape
Will Semiconductor Ltd.
1 May, 2016 - Rev. 1.4
1 page  
WS4508S
Symbol
VTEMP_EN
VTEMP_H
VTEMP_L
Parameter
Battery Temperature Detect
Function Threshold Voltage
TEMP Pin High Threshold
Voltage
TEMP Pin Low Threshold
Voltage
Condition
TEMP Pin Rising(Vcc=5V)
TEMP Pin Falling(Vcc=5V)
TEMP Pin Rising(Vcc=5V)
TEMP Pin Falling(Vcc=5V)
TEMP Pin Rising(Vcc=5V)
TEMP Pin Falling(Vcc=5V)
Min.
0.18
72
43
Typ.
0.29
0.2
80
73.5
48.5
45
Max.
0.32
82
50
Unit
V
V
%Vcc
%Vcc
%Vcc
%Vcc
Absolute Maximum ratings
Parameter
Supply Voltage
PROG Voltage
BAT Voltage
CHGb Voltage
PROG Pin Current
Junction Temperature
Operation Temperature
Storage Temperature
Lead Temperature (Soldering 10s)
Symbol
VCC
VPROG
VBAT
VCHGb
IPROG
Tj
Top
Tsg
Rating
-0.3~8
-0.3~VCC
-0.3~8
-0.3~VCC
1000
150
-45~85
-65~125
260
Unit
V
V
V
V
mA
oC
oC
oC
oC
Will Semiconductor Ltd.
5 May, 2016 - Rev. 1.4
5 Page 
R1
RTL RTH(K2 K1)
(RTL RTH)K1 K 2
R2
RTL(K1
RTL RTH(K2 K1)
K1 K2 ) RTH(K2 K1 K2 )
Likewise, for positive temperature coefficient
thermistor in battery, we have RTH＞RTL and we can
calculate:
R1
RTH RTL(K2 K1)
(RTH RTL )K1 K 2
R2
RTH(K1
RTH RTL(K2 K1)
K1 K2 ) RTL(K2 K1 K2 )
We can conclude that temperature monitor range is
independent of power supply voltage VCC and it only
depends on R1, R2, RTL and RTH: The values of RTH
and RTL can be found in related battery handbook or
deduced from testing data. In actual application, if
only one terminal temperature is concerned
(normally protecting overheating), there is no need
to use R2 but R1. It becomes very simple to
calculate R1 in this case.
Undervoltage Lockout (UVLO)
An internal undervoltage lockout circuit monitors the
input voltage and keeps the charger in shutdown
mode until VCC rises above the undervoltage lockout
threshold. The UVLO circuit has a built-in hysteresis
of 250mV. Furthermore, to protect against reverse
current in the power MOSFET, the UVLO circuit
keeps the charger in shutdown mode if VCC falls to
within 50mV of the battery voltage. If the UVLO
comparator is tripped, the charger will not come out
of shutdown mode until VCC rises 120mV above the
battery voltage.
WS4508S
initiated by reconnecting the program resistor.
The CE pin can also shutdown the charger when the
CE pin voltage is less the 0.4V. To restart the charge
cycle, the CE pin voltage must be larger than 1.2V.
In manual shutdown, The CHGb pin and the
STDBYb pin are in a high impedance state if the
WS4508S is in manual shutdown mode or in the
undervoltage lockout mode: either VCC is within
120mV of the BAT pin voltage or insufficient voltage
is applied to the VCC pin.
Automatic recharge
Once the charge cycle is terminated, the WS4508S
continuously monitors the voltage on the BAT pin
using a comparator with a 2ms filter time (TRECHRG).
A charge cycle restarts when the battery voltage
falls below 4.05V (Typ.) (which corresponds to
approximately 80% to 90% battery capacity). This
ensures that the battery is kept at or near a fully
charged condition and eliminates the need for
periodic charge cycle initiations. CHGb output
enters a pull-down state during recharge cycles.
VCC
10uF
R3
uP
4 VCC
8 CE
TEMP 1
R4
7
WS4508S
BAT
CHGb
5
10uF
6 STDBYb
2
Li-Lon
BAT
GND
RPROG
3
Figure4. Manual Shutdown Mode Application Circuit
Manual Shutdown
At any point in the charge cycle, the WS4508S can
be put into shutdown mode by removing RPROG thus
floating the PROG pin. This reduces the battery
drain current to less than 1uA and the supply current
to less than 50uA. A new charge cycle can be
Will Semiconductor Ltd.
11 May, 2016 - Rev. 1.4
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet WS4508S.PDF ] | |
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