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參數資料
| 型號： | ADP3510 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Secondary Over-Voltage Protection for 2-4 cell in series Li-Ion/Poly (4.40V) 8-SM8 -40 to 110 |
| 中文描述： | CDMA的電源管理系統 |
| 文件頁數： | 13/16頁 |
| 文件大小： | 283K |
| 代理商： | ADP3510 |
REV. 0
ADP3510
–13–
LOW CURRENT
CHARGE MODE
V
SENSE
= 15mV
NONCHARGING
MODE
CHARGER DETECTED
CHRIN > BATSNS
NO
YES
VBAT > UVLO
BATTERY TYPE
END OF CHARGE
V
SENSE
< 12mV
VBAT > 4.2V
EOC = HIGH
CHGEN = LOW
TERMINATE CHARGE
CHREN = HIGH
GATEIN = HIGH
VBAT > 5.5V
VBAT < 5.5V
NO
YES
NiMH
Li
YES
NO
NO
NO
YES
NO
YES
HIGH CURRENT
CHARGE MODE
V
SENSE
= 172mV
CONSTANT
VOLTAGE MODE
CHGEN = HIGH
NiMH
CHARGING MODE
GATEIN = PULSED
NiMH
CHARGER OFF
GATEIN = HIGH
YES
Figure 6. Battery Charger Flowchart
Trickle Charging
When the battery voltage is below the UVLO threshold, the
charge current is set to the low current limit, or about 10% of
the full charge current. The low current limit is determined by the
voltage developed across the current sense resistor. Therefore,
the trickle charge current can be calculated by:
mV
R
SENSE
Trickle charging is performed for deeply discharged batteries to
prevent undue stress on either the battery or the charger.
Trickle charging will continue until the battery voltage exceeds
the UVLO threshold.
Once the UVLO threshold has been exceeded, the charger will
switch to the high current limit, the LDOs will start up, and the
baseband processor will start to run. The processor must then
I
CHR TRICKLE
(
)
=
15
(3)
poll the battery to determine which chemistry is present and set
the charger to the proper mode.
Lithium Ion Charging
For lithium ion charging, the CHGEN input must be low. This
allows the ADP3510 to continue charging the battery at the full
current. The full charge current can be calculated by using:
I
mV
R
CHR FULL
(
SENSE
)
=
172
(4)
If the voltage at BATSNS is below the charger’s output voltage of
4.2 V, the battery will continue to charge in the constant current
mode. If the battery has reached the final charge voltage, a con-
stant voltage is applied to the battery until the charge current has
reduced to the charge termination threshold. The charge termination
threshold is determined by the voltage across the sense resistor.
If the battery voltage is above 4.0 V and the voltage across the
sense resistor has dropped to 12 mV, then an end of charge signal
is generated and the EOC output goes high
(see Figure 7).
The baseband processor can either let the charger continue to
charge the battery for an additional amount of time or terminate
the charging. To terminate the charging, the processor must
pull the GATEIN and CHGEN pins high.
3.2V
ICHARGE
EOC
INDICATOR
VBAT
HIGH
CURRENT
4.2V
EOC
CURRENT
LOW
CURRENT
0
Figure 7. Lithium Ion Charging Diagram
NiMH Charging
For NiMH charging, the processor must pull the CHGEN pin high.
This disables the internal Li+ mode control of the gate drive pin. The
gate drive must now be controlled by the baseband processor. By
pulling GATEIN high, the GATEDR pin is driven high, turning the
PMOS off. By pulling the GATEIN pin low, the GATEDR pin is
driven low, and the PMOS is turned on. So, by pulsing the GATEIN
input, the processor can charge a NiMH battery. Note that when
charging NiMH cells, a current limited adapter is required.
During the PMOS off periods, the battery voltage needs to be moni-
tored through the MVBAT pin. The battery voltage is continually
polled until the final battery voltage is reached. Then the charge
can either be terminated or the frequency of the pulsing reduced. An
alternative method of determining the end of charge is to monitor
the temperature of the cells and terminate the charging when a
rapid rise in temperature is detected.
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相關代理商/技術參數 |
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| ADP3510ARU | 制造商:AD 制造商全稱:Analog Devices 功能描述:CDMA Power Management System |
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| ADP3522ACP-1.8 | 制造商:AD 制造商全稱:Analog Devices 功能描述:GSM Power Management System |
| ADP3522ACP-1.8-RL | 制造商:Analog Devices 功能描述:GSM Power Management System 32-Pin LFCSP EP T/R |
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