BQ24721RHBR

Output Current :
Maximum Operating Temperature : + 85 C
Minimum Operating Temperature : - 40 C
Packaging : Reel
Battery Type : Li-Ion, Li-Pol, NiCD, NiMH
Output Voltage : 9 V to 19.2 V
Operating Supply Voltage : 0 V to 24 V
Package / Case : QFN-32, 5 x 5


Features:

` High Efficiency NMOS-NMOS Synchronous Buck Converter With User-Selectable 300 kHz or 500 kHz frequency
` SBS-Like ⁽¹⁾ SMBus Interface for Control and Status Communications With Host
` Programmable Battery Voltage, Charge Current, and AC Adapter Current via SBS-Like SMBus Interface
` 0.4% Charge Voltage Regulation Accuracy
` 3% Charge Current Regulation Accuracy
` 3% Adapter Current Regulation Accuracy Dynamic Power Management (DPM)
` 2% Accuracy Integrated Charge and AC Adapter 20x Current Amplifier Output
` Battery Pack Voltage Range 0 V 19.2 V
` AC Adapter Operating Range 8 V 28 V
` 99.5% Max Duty Cycle
` Internal Soft Start
` Integrated 5% 5-V LDO When AC Adapter Applied
` 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 5x5mm QFN Package

Application

· Portable Notebook Computers
· Portable DVD Players
· Webpads, PC Tablets

Pinout




Specifications

PARAMETER	PIN	VALUE / UNIT
Supply voltage range	ACN, ACP, PVCC, ACDRV, SYNN, SYNP, SRP, SRN , BATDRV, BAT, BYPASS, SYS, VCC	0.3V to 30V
	PH	1V to 30V
	LODRV, REGN, FBO, EAI, EAO, ISYNSET, CHGEN, TS ,VREF5, ACDET, IOUT,ALARM, SCL, SDA	0.3V to 7V
	BTST, HIDRV (with respect to AGND and PGND)	1Vto 36V
Maximum differential voltage	AGND-PGND	0.3V to 0.3V
Maximum difference voltage	ACPACN , SRPSRN, and SYNPSYNN	0.6V
Maximum voltage with respect to VCC	SRN, SRP, SYNN, SYNP, BAT, PH	20V to 30V
Maximum difference voltage	PVCC-BAT, SYSBAT	20V to 30V
Operating ambient temperature range (TA)		40°C to85°C
Maximum junction temperature (TJ_MAX)		150°C
Storage temperature range (Tstg)		65°C to150°C

(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) All voltages are with respect to AGND, unless otherwise noted. Currents are positive into, negative out of the specified terminal. Consult Packaging Section of the Databook for thermal limitations and considerations of packages.

Description

The bq24721 is a simple to use, high efficiency synchronous battery pack charger with high level of integration for portable applications. This device implements a high performance analog front-end that easily interfaces to the system power management micro-controller through a simplified SBS-like SMBus interface.

The dynamic power management (DPM) function of BQ24721RHBR modifies the charge current depending on system load conditions, avoiding ac adapter overload.

High accuracy current sense amplifiers of BQ24721RHBR enable accurate measurement of either the charge current or the ac adapter current, allowing termination of nonsmart packs and monitoring of overall system power.

The adapter isolation diode can be bypassed with an external MOSFET using a control signal provided by the bq24721, thus reducing overall power dissipation.

Integrated features of BQ24721RHBR such as charger soft start, charge overcurrent protection ,and IC temperature monitoring provide a second level of protection,in addition to pack and system protection functions.

Parameters:

Technical/Catalog Information	BQ24721RHBR
Vendor	Texas Instruments
Category	Integrated Circuits (ICs)
Battery Type	Multi-Chemistry
Function	Charge Management
Package / Case	32-QFN
Packaging	Tape & Reel (TR)
Operating Temperature	-40°C ~ 85°C
Voltage - Supply	-
Drawing Number	296; 4204326; RHB; 32
Lead Free Status	Lead Free
RoHS Status	RoHS Compliant
Other Names	BQ24721RHBR BQ24721RHBR