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BQ24702PW View Datasheet(PDF) - Texas Instruments

Part NameBQ24702PW TI
Texas Instruments TI
DescriptionMULTICHEMISTRY BATTERY CHARGER CONTROLLER AND SYSTEM POWER SELECTOR


BQ24702PW Datasheet PDF : 32 Pages
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bq24702, bq24703
SLUS553D − MAY 2003 − REVISED JULY 2005
Programming the Battery Charge Current
The battery charge current is programmed via a voltage on the SRSET pin. This voltage can be derived from
a resistor divider from the 5-V VREF or by means of an DAC. The voltage is converted to a current source that
is used to develop a voltage drop across an internal offset resistor at one input of the SR gm amplifier. The charge
current is then a function of this voltage drop and the sense resistor (RS), refer to Figure 5.
RS
COMP 10
VREF
+
SRSET
5
+
2 k
SRP
16
SRN
15
25 k
UDG−00117
Figure 5. Battery Charge Current Input Threshold Function
The battery charge current can be defined as:
IBAT
+
VSRSET
25 RS
(2)
where VSRSET is the programming voltage on the SRSET pin. VSRSET maximum is 2.5 V.
Programming the Adapter Current
Like the battery charge current described previously, the adapter current is programmed via a voltage on the
ACSET pin. That voltage can either be from an external resistor divider from the 5-V VREF or from an external
DAC. The adapter current is defined as:
IADPT
+
VACSET
25 RS2
(3)
20
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DESCRIPTION
The bq24702/bq24703 is a highly integrated battery charge controller and selector tailored for notebook and sub-notebook PC applications.
The bq24702/bq24703 uses dynamic power management (DPM) to minimize battery charge time by maximizing use of available wall-adapter power. This is achieved by dynamically adjusting the battery charge current based on the total system (adapter) current.
The bq24702/bq24703 uses a fixed frequency, pulse width modulator (PWM) to accurately control battery charge current and voltage. Charge current limits can be programmed from a keyboard controller DAC or by external resistor dividers from the precision 5-V, ±0.6%, externally bypassed voltage reference (VREF), supplied by the bq24702/bq24703.

FEATURES
● Dynamic Power Management, DPM
   Minimizes Battery Charge Time
● Integrated Selector Supports Battery
   Conditioning and Smart Battery Learn Cycle
● Zero Volt Operation
● Selector Feedback Circuit Ensures
   Break-Before-Make Transition
● ±0.4% Charge Voltage Accuracy, Suitable for
   Charging Li-Ion Cells
● ±4% Charge Current Accuracy
● 300-kHz Integrated PWM Controller for
   High-Efficiency Buck Regulation
● Depleted Battery Detection and Indication to
   Protect Battery From Over Discharge
● 20-µA Sleep Mode Current for Low Battery
   Drain
● 24-Pin TSSOP Package and 5 mm × 5 mm
   QFN package (bq24703 only)

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