参数资料
| 型号： | SC810ULTRT |
| 厂商： | Semtech |
| 文件页数： | 17/20页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY MANAGEMENT |
| 标准包装： | 1 |
| 系列： | * |
| 其它名称： | SC810ULDKR |
SC810
Applications Information (continued)
or the fast-charge current limit value, depending on the
voltage at the output.
Operation Without a Battery
The SC810 can be operated as a 4.2V LDO regulator
without the battery present, for example, for factory
testing. If this use is anticipated, the total output capaci-
tance, C BAT plus any other capacitors tied directly to BAT
pin network, should be at least 2.2μF but less than 22μF to
ensure stability in CV regulation. To operate the charger
without a battery, the ENB pin must be driven low or
grounded. The output current is limited by the pro-
grammed fast-charge current. The charger should not be
disabled (V ENB > V IH ) without a battery present.
Dynamically Selectable Charge Current
The IPRGM resistance can be altered dynamically under
processor control by switching a second IPRGM pin resis-
tor. When the higher current is required, the switch is
turned on, making the effective programming resistance
equal to the parallel combination of the two resistors. The
external circuit is illustrated in Figure 6.
this event. While unlikely to do any harm, this effect must
also be considered.
USB Dedicated Charger Compatibility
The SC810 is well suited to the USB Charging Specification,
Revision 1.0, Dedicated Charger, Sections 3.5 and 4.1, due
to thermal limiting and its current-limited-supply charg-
ing behavior.
The USB Dedicated Charger is required to limit its output
current to more than 0.5A and less than 1.5A. A dedicated
charger identifies itself by shorting together the USB D+
and D- lines. Once the dedicated charger is detected, the
SC810, with its 1A maximum programmed fast charge
current, permits the fast-charge current to be set higher
than the 500mA USB High Power Mode specified limit to
permit faster charging of a large battery. (See the section
Dynamically Selectable Charge Current.)
If the USB Dedicated Charger ’s current limit exceeds the
SC810 programmed fast-charge current, then its output
will regulate to 5V, and the fast-charge current will be
determined by the SC810 IPRGM pin resistance to ground.
IPRGM
R IPRGM_HI
4
If the resulting power dissipation in the SC810 causes an
excessive rise in temperature, then thermal limiting will
reduce the charge current as needed to ensure safe charg-
Hi/Lo
Current Select
R IPRGM
ing. But if the USB Dedicated charger’s current limit is less
than the SC810 programmed fast-charge current, then its
output voltage will be pulled down to the battery voltage
Figure 6 — Dynamic selection of low and high charge
currents.
Note that the IPRGM pin resistor programs the fast-charge,
pre-charge, and termination currents, so all will be modi-
fied by a change in the IPRGM pin resistor.
An open-drain GPIO can be used directly to engage the
parallel resistor R IPRGM_HI . Care must be taken to ensure that
the R DS-ON of the GPIO is considered in the selection of
R IPRGM_HI . Also important is the part-to-part and tempera-
ture variation of the GPIO R DS-ON , and their contribution to
the High Current charge current tolerance. Note also that
IPRGM will be pulled up briefly to as high as 3V during
startup to check for an IPRGM static pinshort to ground. A
small amount of current could, potentially, flow from
IPRGM into the GPIO ESD structure through R IPRGM_HI during
plus charging path dropout. (The USB Dedicated Charger
is required to maintain its current limit down to 2V.) This
behavior is recognized in the USB Battery Charging
Specification, Section 3.5, as an accepted means to reduce
power dissipation in the charging circuit while charging at
high current.
The SC810 thermal limiting and current-limited-adapter
charging capability together ensure reliable charging at
any programmed charge current, using any USB Battery
Charging Specification compliant Dedicated Charger,
regardless of its current limit.
External Power Path Management
Some applications require that the battery be isolated
from the load while charging. Figure 7 illustrates a typical
charger bypass circuit. This circuit powers the load directly
from the charging source via the Schottky diode D BYPASS .
17
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