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PDF BP13504 Data sheet ( Hoja de datos )
| Número de pieza | BP13504 | |
| Descripción | Standalone Linear Li-Ion Charger | |
| Fabricantes | BPSEMI | |
| Logotipo |  |
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BPSEMI
BP13504
Standalone Linear Li-Ion Charger with
Thermal Regulation
General Description
The BP13504 is a comp lete linear charger for single
cell lithium-ion bat teries. With small TDFN- 10
package and few external components, BP13504 is
well suited for portable applications. In addition, the
BP13504 is specific ally designed t o work within USB
power specifications.
No ext ernal s ense resist or and bl ocking d iode are
required. Charging cu rrent can be programmed
externally wi th a sin gle r esistor. T he b uilt-in th ermal
regulation facilitates charging with maximum power
without risk of overheating.
The BP13504 always preconditions the battery with
1/10 of t he program med charge cu rrent at the
beginning of a charge cycle, after it verifies that the
battery can be fast
-charged. The BP13504
automatically te rminates the c harge c ycle w hen
the charge current drops to 1/10th the programmed
value after the final float voltage is reached.
The BP13504 feat ures 13. 5V maximum rat ing
voltage for AC adapter, and it pro vides the charge
current up to 1.2A. Ot her feat ures incl ude batt ery
temperature monitoring, reverse current protection,
shutdown mode, charging current monit or, under
voltage lockout, aut omatic recha rge a nd st atus
indicator.
Features
Programmable charge current up to 1.2A
No MOSFET, sense resistor or blocking diode
required
Complete linear charger in TDFN-10 for single
cell li-ion batteries
Thermal regulation maximizes charge rate
without risk of overheating
Thermistor input for temperature qualified
charging
Charges single cell Li-ion batteries directly
from USB port.
Preset 4.2V charge voltage with ̈́1%
accuracy
Automatic recharge
Charge status indicator
C/10 charge termination
Battery reverse leakage current less than 1uA
Applications
Wireless handsets
Hand-held instruments
Portable information appliances
1
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1 page  
Functional Block Diagram
BP13504
ACIN
CHG_SB
ACIN
BAT
Body
Switch
BS BS
Regulation
Controller
-+
BS
BATT
PGOODB
GND
-+
1.2V
2.9V
BAT
Temperature
Controller
1.5V
0.15V
UVLO/OVP
BAT
4.05V
Logic
Controller
0.15V
Disable
COLD
2.15V
2.5V
HOT
0.5V
FIG.1. Functional Block Diagram of BP13504
ISETA
ENB
TS
5
5 Page 
BP13504
The BP13504 constantly monitors the BATT pin voltage in standby mode. If this voltage drops below the 4.05V
recharge threshold (VRECHRG), another charge cycle begins and current is once again s upplied to the battery.
To manually restart a charge cycle when in standby mode, the input voltage must be removed and reapplied,
or the charger must be shut down and restarted using the ISETA pin.
Charge Status Indicator (CHG_SB)
The charge st atus output has t hree different s tates: s trong pull-down (~10mA), weak pu ll-down (~25uA) and
high impedance. The strong pull-down state indicates that the BP13504 is in a charge cycle. Once the charge
cycle has t erminated, the pin st ate is det ermined by under- voltage lockout condit ions. A weak pu ll-down
indicates t hat ACIN meet s the UVLO co nditions and t he BP13504 is ready t o charge. High im pedance
indicates that the BP13504 is i n under-voltage lockout mode: either VIN is less than 60mV above the BATT pin
voltage or insufficient voltage is applied to the ACIN pin. A microprocessor can be used to distinguish between
these three states. This method is discussed in the Applications Information section.
Thermal Limiting
An internal thermal feedback loop reduces the programmed charge current if the die temperature attempts
to rise abov e a preset v alue of approx imately 120°C. This feature protects the BP13504 from excessive
temperature and allows the user t o push the limits of t he power handling capability of a given circuit board
without risk of damaging the BP13504. The charge curr ent can be set accor ding to typi cal (not worst-case)
ambient temperature with the assurance that the charger will automatically reduce the current in worst-case
conditions. TDFN-10 power considerations are discussed further in the Applications Information section.
Under-voltage Lockout (UVLO)
An internal under-voltage lockout circuit monitors the input voltage and keeps the charger in shutdown mode
until ACIN rises above the under-voltage lockout threshold. The UVLO circuit has a built-in hysteresis of 150mV.
Furthermore, to prot ect aga inst re verse cu rrent in t he po wer MOSFET, the U VLO c ircuit keeps t he charger in
shutdown mo de if ACIN falls t o wit hin 3 0mV of t he bat tery v oltage. If t he UVLO comparat or is t ripped, the
charger will not come out of shutdown mode until ACIN rises 60mV above the battery voltage.
Manual Shutdown
At any point in the charge cycle, the BP13504 can be put into shutdown mode by removing RSET thus floating
the ISETA pin. This reduces the battery drain current to about to 0uA and the supply current to less than 150uA.
A new charge cycle can be initiated by reconnecting the program resistor.
In manual shutdown, the CHG_SB pin is in a weak pull- down state as long as ACIN is high enough to exceed
the UVLO conditions. The CHG_SB pin is in a high impedance state if the BP13504 is in under-voltage lockout
mode: either ACIN is within 60mV of the BATT pin voltage or insufficient voltage is applied to the ACIN pin.
Automatic Recharge
Once the charge cycle is terminated, the BP13504 continuously monitors the voltage on the BATT pin using a
comparator with a 2ms filter time (TRECHARGE). A charge cycle restarts when the battery voltage falls below 4.05V
(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. CHG_SB output
enters a strong pull-down state during recharge cycles.
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet BP13504.PDF ] | |
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