BQ24721C BQ24721 advanced battery management chip

BQ24721C BQ24721 advanced battery management chip

ADVANCED MULTI-CHEMISTRY AND MULTI-CELL SYNCHRONOUS SWITCH-MODE
CHARGER AND SYSTEM POWER SELECTOR
· Portable Notebook Computers 2· High Efficiency NMOS-NMOS Synchronous
Buck Converter With User-Selectable 300 kHz · Portable DVD Players
or 500 kHz frequency · Webpads, PC Tablets
· bq24721C Offers Softer Turn-On, Stronger
Turn-Off
· SBS-Like(1) SMBus Interface for Control and The bq24721 is a high efficiency synchronous battery
Status Communications With Host pack charger with high level of integration for portable
· Programmable Battery Voltage, Charge applications. This device implements a high
Current, and AC Adapter Current via SBS-Like performance analog front-end that interfaces to the
SMBus Interface system power management micro-controller through a simplified SBS-like SMBus interface.
· 0.4% Charge Voltage Regulation Accuracy
· 3% Charge Current Regulation Accuracy The dynamic power management (DPM) function modifies the charge current depending on system
· 3% Adapter Current Regulation Accuracy load conditions, avoiding ac adapter overload.
Dynamic Power Management (DPM)
High accuracy current sense amplifiers enable
· 2% Accuracy Integrated Charge and AC accurate measurement of either the charge current or
Adapter 20× Current Amplifier Output the ac adapter current, allowing termination of
· 3-Cell and 4-Cell Li-Ion Voltage Regulation nonsmart packs and monitoring of overall system
9 V, 12 V–14.4 V, 16 V–19.2 V power.
· Battery Pack Voltage Operating Range The adapter isolation diode can be bypassed or
0 V–19.2 V entirely replaced with an external MOSFET using a
· AC Adapter Operating Range 8 V–28 V control signal provided by the bq24721, thus reducing
· 99.5% Max Duty Cycle overall power dissipation.
· Internal Soft Start Integrated features such as charger soft start, charge overcurrent protection, and IC temperature monitoring
· Integrated 5% 5-V LDO When AC Adapter provide a second level of protection, in addition to
Applied pack and system protection functions.
· 6-V Drive Supply Voltage for Increased
Efficiency
· Reverse Battery to Adapter Discharge
Protection
· Battery/Adapter to System Power Selector
Function
· Charge and Adapter Overcurrent Protection
· Battery Thermistor Sense, TS, Comparators
· Available in 32-Pin 5x5-mm QFN Package
(1) SBS-Like interface is not 100% SBS compliant. SBS-Like
interface is SMBus1.1 complaint but does not support Packet Error
Correction (PEC). The control and status registers were changed
to simplify and enhance notebook charger control. An 8-bit address
(0x12) is used. See Table 1 for a comparison between SBS-like vs
SBS Specification.

datasheet http://focus.ti.com/lit/ds/symlink/bq24721c.pdf

BQ24721CRHBR