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参数资料
| 型号： | PC13892VLR2 |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PBGA186 |
| 封装： | 12 X 12 MM, 0.80 MM PITCH, ROHS COMPLIANT, PLASTIC, BGA-186 |
| 文件页数： | 55/75页 |
| 文件大小： | 3848K |
| 代理商： | PC13892VLR2 |
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Analog Integrated Circuit Device Data
Freescale Semiconductor
59
13892
FUNCTIONAL DEVICE OPERATION
Because of an order from the United States International Trade Commission, BGA-packaged product lines and part numbers indicated here currently are not
available from Freescale for import or sale in the United States prior to September 2010: MC13892VK and MC13892VL in 139, 186 MAPBGA packages.
Figure 11. 13892 Charge Path
Transistors M1 and M2 control the charge current and
provide voltage regulation. The latter is used as the top off
change voltage, and as the regulated supply voltage to the
application, in case of dead battery operation. In order to
support dead battery operation, a so called “serial path”
charging configuration including M3 needs to be used. Then
in case of a dead battery, the transistor M3 is made non-
conducting and the internal trickle charge current charges the
battery. If the battery is sufficiently charged, the transistor M3
is made conducting which connects the battery to the
application, just like during normal operation without a
charger. In so called single path charging, M3 is replaced by
a short and the pin BATTFET must be floating. Dead battery
operation is not supported in that case. Transistors M1 and
M2 become non-conducting if the charger voltage is too high.
The UVBUS pin must be shorted to CHRGRAW in cases
where the charger is being supplied from the USB cable. A
current can be supplied from the battery to an accessory with
all transistors M1, M2, and M3 conducting by enabling the
reverse supply mode. An unregulated wall charger
configuration can be built, in which case CHRGSE1B must be
pulled low. The battery current monitoring resistor R1 and the
charge LED indicator are optional.
CHARGE PATH REGULATOR
M1 and M2 are permanently used as a combined pass
device for a super regulator, with a programmable output
voltage and programmable current limit.
The voltage loop consists of M1, M2, and an amplifier with
voltage feedback taken from the BPSNS pin. The value of the
sense resistor is of no influence on the output voltage. The
output voltage is programmable by SPI from 3.8 to 4.45 V.
The current loop is composed of the M1 and M2 as control
elements, the external sense resistor, a programmable
current limit, and an amplifier. The control loop will regulate
the voltage drop over the external resistor. The charge
current is programmable by SPI from 0 to 1600 mA.
INTERNAL TRICKLE CHARGE CURRENT SOURCE
An internal current source between BP and BATTISNS
provides small currents to the battery, in case of trickle
charging a dead battery.
COMPARATORS
The charger detection is based on three comparators. The
“charger valid”, which monitors CHRGRAW, the “charger
presence”, which monitors the voltage drop between
CHRGRAW and BPSNS, and the “CHGCURR” comparator,
which monitors the current through the sense resistor
connected between CHRGISNS and BPSNS. A charger
insertion is detected, based on the charger presence
comparator and the “charger valid” comparator both going
high. For all but the lowest current setting, a charger removal
is detected, based on both the “charger presence”
comparator going low and the charger current falling below
CHGCURR. In addition, for the lowest current settings, or if
not charging, the “charger valid” comparator going low is an
additional cause for charger removal detection.
In addition to the aforementioned comparators, three more
comparators play a role in battery charging. These
comparators are “BATTMIN”, which monitors BATT for the
safe charging battery voltage, “BATTON”, which monitors
BATT for the safe operating battery voltage, and
“BATTCYCL”, which monitors BPSNS for the constant
current to constant voltage transition. The BATTMIN and
BATTON comparators have a normal and a long (slow)
debounced output. The slow output is used in some places in
the charger flow to provide enough time to the battery
protection circuit to reconnect the battery cell.
BATTERY THERMISTOR CHECK CIRCUITRY
A battery pack may be equipped with a thermistor, which
value decreases over temperature.
By default, the battery thermistor value is taken into
account for charging the battery
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