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SL1053 Schematic ( PDF Datasheet ) - SiL

Teilenummer SL1053
Beschreibung Advanced Lithium-Ion Linear Battery Charger
Hersteller SiL
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Gesamt 9 Seiten
SL1053 Datasheet, Funktion
SL1053
Advanced Lithium-Ion Linear Battery Charger
General Description
SL1053 is a single Lithium-Ion or Lithium-Polymer cell linear battery charger which is
designed for compact and cost-sensitive handheld devices. It combines charge status indication,
charge termination, battery temperature monitoring, and high accuracy current and voltage
regulation in a SOP-8 package.
SL1053 charges the battery in three modes, precharge, constant current, constant voltage. If
the battery voltage is below the precharge threshold VO(MIN), the SL1053 precharges the battery
with a lower conditioning current. After precharge, the SL1053 applies a constant current to the
battery. An external sense-resister sets the charge current. The constant voltage mode continues
until the battery reaches the regulation
The battery temperature is continuously measured by an external thermistor through the TS
pin. SL1053 inhibits charge until the temperature is within the range defined by users.
Features
For Single Lithium-Ion or Lithium-Polymer Cell Battery Pack 4.2V
A Few External Components are Required
Precharge, Constant Current, Constant Voltage Modes
Battery Temperature Monitor
Charge Status Indication
Automatic Battery Recharge
Charge Termination Detect
Auto Low Power Sleep Mode when VDD Power is removed
MSOP-8 Package
RoHS Compliant and 100% Lead (Pb)-Free
Applications
Digital Cameras
PDAs
Cellular Phones
Information Appliance
Pin Configurations
1






SL1053 Datasheet, Funktion
SL1053
Detection
First, the FB/CE pin must connect to VDD or a voltage divider to enable the charge function. And
then if a battery is already inserted and the input power source is absent, the SL1053 will enter
sleep mode to prevent draining power from battery. When input power source and battery are both
existed, another detection is the battery temperature. The TS pin voltage must be in the allowed
range as shown in Figure 6 and the electrical characteristics, and then the SL1053 will start the
charge cycle according to the battery voltage conditions.
Precharge Mode
When the battery voltage is lower than the precharge threshold VO(MIN), the SL1053 begins to
charge the battery in precharge mode. In this condition, the precharge current is set at
approximately 10% of the constant regulation current. The purposes of small precharge current are
to minimize the power dissipation on the external switch during the precharge period and to revive
deeply discharged battery cells.
Constant Current Regulation Charge Mode
When the battery voltage is between the precharge threshold VO(MIN) and the regulation voltage
VO(REG), the SL1053 starts the constant current regulation charge mode. SL1053 monitors
charge current with voltage drop between two terminals of a sense-resistor, RCS, which connects
to pin VDD and CS. The following equation can calculate the desired charging current.
6

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