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PDF WS4518D Data sheet ( Hoja de datos )
| Número de pieza | WS4518D | |
| Descripción | Single Li-ion Battery Charger | |
| Fabricantes | WillSEMI | |
| Logotipo |  |
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WS4518D
300mA, Single Li-ion Battery Charger
WS4518D
www.sh-willsemi.com
Descriptions
The WS4518D 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.
The WS4518D automatically terminates the charge
cycle when the charge current drops to 3/10 the
programmed value after the final float voltage is
reached.
DFN2X2-6L
PROG 1
GND
6 TEMP
GND 2
WS4518D
5 CHRGb
VCC 3
Expose Pad
4 BAT
Pin configuration (Top view)
When the input supply (wall adapter or USB supply) is
removed, the WS4518D automatically enters a low
current state, dropping the battery drain current to less
than 0.5uA. The WS4518D can be put into shutdown
mode, reducing supply current to 40uA (Typ.).
4518
WDYW
The WS4518D is available in a small package with
DFN2X2-6L. Standard product is Pb-Free.
Features
Programmable Charge Current Up to 300mA
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
4518 = Device Code
WD = Package Code
Y = Year
W = Week
Marking
Order information
Device
Package
Shipping
WS4518D-6/TR DFN2X2-6L 3000/Reel&Tape
Applications
Wireless phone
MP3/MP4 Player
Bluetooth device
Will Semiconductor Ltd.
1 Apr, 2016 - Rev. 1.3
1 page  
Electronics Characteristics (VCC=5V, Ta=25oC, unless otherwise noted)
Symbol
ISPLYCHRG
IBATCHRG
VPROGCHRG
ISPLYSTBY
IBATSTBY
ISPLYASD
IBATASD
ISPLYUVLO
IBATUVLO
ISPLYSHUT
IBATSHUT
IBATMSD
IBATSLEEP
VFLOAT
ITRIKL
VTRIKL
VTRIKL, HYS
VUVLO
VUVLO, HYS
VMSD
Parameter
Charge Mode Supply Current
Charge Mode Battery Current
PROG Pin Voltage
Standby Mode Supply Current
Standby Mode Battery Current
Shutdown Mode Supply Current
Shutdown Mode BAT Pin Current
UVLO Mode Supply Current
UVLO Mode BAT Pin Current
Shutdown Mode Supply Current
Shutdown Mode BAT Pin Current
Manual Shutdown BAT Pin Current
Sleep Mode BAT Pin Current
Float Voltage
Trickle Charge Current
Trickle Charge Voltage Threshold
Trickle Charge Voltage Hysteresis
UVLO Threshold
UVLO Hysteresis
Manual Shutdown Threshold Voltage
Condition
RPROG=10kΩ
RPROG=20kΩ
RPROG=10kΩ
RPROG=20kΩ
RPROG=33.3kΩ
RPROG=10kΩ
RPROG=20kΩ
Charge Terminated
Charge Terminated
VCC<VBAT
VCC<VBAT
VCC<VUV
VCC<VUV
RPROG not Connected
RPROG not Connected
VPROG=1.3V
VCC=0V
RPROG=10kΩ
RPROG=10kΩ
RPROG=10kΩ
From VCC Low to High
PROG Pin Rising
PROG Pin Falling
Min.
90
44
25
0.93
0.93
0
20
20
20
4.158
19
2.8
3.6
VASD
ΔVRECHRG
VCHRGb
TLIM
RON
TSS
TRECHRG
TTERM
IPROG
VTEMP_EN
Vcc-VBAT Lockout Threshold Voltage
Auto Recharge Battery Voltage
CHRGb Pin Output Low Voltage
Junction Temperature In CT Mode
Power FET ON Resistance
Soft-Start Time
Recharge Comparator Filter Time
Termination Comparator Filter Time
PROG Pin Pull-up Current
Battery Temperature Detect Function
Threshold Voltage
VCC from Low to High
VCC from High to Low
ICHRGb=5mA
RPROG=2kΩ
TEMP Pin Rising
TEMP Pin Falling
5
100
0.7
0.18
VTEMP_H
TEMP Pin High Threshold Voltage
TEMP Pin Rising
TEMP Pin Falling
72
VTEMP_L
TEMP Pin Low Threshold Voltage
TEMP Pin Rising
TEMP Pin Falling
43
WS4518D
Typ.
250
200
100
49
28.5
1.00
1.00
136
-2.5
42
±0.05
42
±0.05
42
±0.05
±0.05
±0.05
4.2
29
2.9
100
3.8
250
1.2
1.0
120
50
150
0.3
165
200
100
2
1
1.1
0.29
0.2
80
73.5
48.5
45
Max.
2000
2000
110
54
32
1.07
1.07
500
-6
90
±1
90
±1
70
±1
±1
±1
4.242
39
3.0
4.0
1.3
200
0.6
1.5
0.32
82
50
Unit
uA
uA
mA
mA
mA
V
V
uA
uA
uA
uA
uA
uA
uA
uA
uA
uA
V
mA
V
mV
V
mV
V
V
mV
mV
mV
V
oC
mΩ
us
ms
ms
uA
V
V
%Vcc
%Vcc
%Vcc
%Vcc
Will Semiconductor Ltd.
5 Apr, 2016 - Rev. 1.3
5 Page 
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.
WS4518D
impedance state if the WS4518D 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
WS4518D 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. CHRGb output
enters a pull-down state during recharge cycles.
VCC
10uF
uP
3 VCC
TEMP 6
R1
5
WS4518D
BAT
CHRGb
4
10uF
PROG 1
Li-Lon
BAT
GND
RPROG
2
Figure4. Manual Shutdown Mode Application Circuit
Manual Shutdown
At any point in the charge cycle, the WS4518D 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
initiated by reconnecting the program resistor.
In manual shutdown, The CHRGb pin is in a high
Will Semiconductor Ltd.
11 Apr, 2016 - Rev. 1.3
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet WS4518D.PDF ] | |
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