bq241xx Synchronous Switched-Mode, Li-Ion and Li-Polymer Charge-Management IC With Integrated Power FETs (bqSWITCHER™)
- SLUS606P June 2004 – November 2015
  
  PRODUCTION DATA.

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DATA SHEET

bq241xx Synchronous Switched-Mode, Li-Ion and Li-Polymer Charge-Management IC With Integrated Power FETs (bqSWITCHER™)

1 Features

Ideal For Highly Efficient Charger Designs For Single-, Two-, or Three-Cell Li-Ion and Li-Polymer Battery Packs
bq24105 Also for LiFePO₄ Battery (see Using bq24105 to Charge the LiFePO₄ Battery)
Integrated Synchronous Fixed-Frequency PWM Controller Operating at 1.1 MHz With 0% to 100% Duty Cycle
Integrated Power FETs for Up To 2-A Charge Rate
High-Accuracy Voltage and Current Regulation
Available in Both Stand-Alone (Built-In Charge Management and Control) and System-Controlled (Under System Command) Versions
Status Outputs for LED or Host Processor Interface Indicates Charge-In-Progress, Charge Completion, Fault, and AC-Adapter Present Conditions
20-V Maximum Voltage Rating on IN and OUT Pins
High-Side Battery Current Sensing
Battery Temperature Monitoring
Automatic Sleep Mode for Low Power Consumption
System-Controlled Version Can Be Used in NiMH and NiCd Applications
Reverse Leakage Protection Prevents Battery Drainage
Thermal Shutdown and Protection
Built-In Battery Detection
Available in 20-Pin, 3.50 mm × 4.50 mm VQFN Package

2 Applications

Handheld Products
Portable Media Players
Industrial and Medical Equipment
Portable Equipment

3 Description

The bqSWITCHER™ series are highly integrated Li-ion and Li-polymer switch-mode charge management devices targeted at a wide range of portable applications. The bqSWITCHER™ series offers integrated synchronous PWM controller and power FETs, high-accuracy current and voltage regulation, charge preconditioning, charge status, and charge termination, in a small, thermally enhanced VQFN package. The system-controlled version provides additional inputs for full charge management under system control.

The bqSWITCHER™ charges the battery in three phases: conditioning, constant current, and constant voltage. Charge is terminated based on user- selectable minimum current level. A programmable charge timer provides a safety backup for charge termination. The bqSWITCHER™ automatically restarts the charge cycle if the battery voltage falls below an internal threshold. The bqSWITCHER™ automatically enters sleep mode when V_CC supply is removed.

Device Information ⁽¹⁾

PART NUMBER	PACKAGE	BODY SIZE (NOM)
bq241xx	VQFN (20)	3.50 mm × 4.50 mm

For all available packages, see the orderable addendum at the end of the data sheet.

Typical 1-Cell Application

bq24100 bq24103 bq24103A bq24104 bq24105 bq24108 bq24109 bq24113 bq24113A bq24115 tc_app1_lus606.gif

4 Revision History

Changes from O Revision (March 2010) to P Revision

Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information sectionGo

Changes from M Revision (August 2008) to N Revision

Added part number bq24104.Go
Added part number bq24104 to the Ordering InformationGo
Deleted Product Preview from bq24104RHLRGo
Deleted Product Preview from bq24104RHLTGo
Added bq24104 to the Terminal Functions table.Go
Added part number bq24104 to the Deglitch timeGo
Added bq24104 to Table 2.Go
Added part number bq24104 to Figure 16 Go

Changes from L Revision (December 2007) to M Revision

Changed specifications and symbols for (cold, hot, and cutoff) temperature thresholdsGo
Changed equation definitionsGo
Changed equation definitionsGo

Changes from K Revision (November 2007) to L Revision

Changed Added figure almost identical to Figure 3. Changed RISET2 to 20 kohms.Go
Added Changed resistor bridge values 301 to 143, 100 to 200 KohmsGo

Changes from J Revision (October 2007) to K Revision

Changed From: CIU To: CDYGo
Added bq24109 to V_OREG Go
Added part number bq24109 to V_LOWV Go
Changed Deglitch time for temperature fault, TS, bq24109 typical value From: 1000 To: 500Go
Changed From: Single-cell or two-cell To: one-, two-, or three-cell applications. Deleted text.Go

Changes from I Revision (August 2007) to J Revision

Added part number bq24109 Go
Added part number bq24109 to the Ordering InformationGo
Added bq24109 to the Terminal Functions table.Go
Added part number bq24109 to the Deglitch timeGo
Added bq24109 to Table 2.Go

Changes from H Revision (July 2007) to I Revision

Added part number bq24103A Go
Changed device size From: 5,5 mm x 3.5 mm To: 4,5 mm x 3.5 mmGo
Added part number bq24103A to the Ordering InformationGo
Added bq24103A to the Terminal Functions table.Go
Added part numbers bq24103Ana d bq24113A to V_OREG Go
Added part number bq24103A to V_LOWV Go
Added part number bq24103A to Figure 16 Go

Changes from G Revision (June 2007) to H Revision

Changed Figure 1 Go
Changed Figure 2 Go
Added D1 to diode MMBZ18VALT1 in Figure 13.Go
Added D1 to diode MMBZ18VALT1 in Figure 16 Go
Added D1 to diode MMBZ18VALT1 in Figure 17 Go
Added D1 to diode MMBZ18VALT1 and Note A to Figure 18.Go

Changes from F Revision (January 2007) to G Revision

Added bq24113A to the data sheet and the Ordering Information.Go
Added bq24113A to the Terminal Functions table.Go
Changed bq24113A added to Figure 18 Go

5 Device Options

CHARGE REGULATION VOLTAGE (V)	INTENDED APPLICATION	PART NUMBER ⁽¹⁾ ⁽²⁾ ⁽³⁾
4.2 V	Stand-alone	bq24100
1 or 2 cells selectable (CELLS pin, 4.2 V or 8.4 V)	Stand-alone	bq24103
1 or 2 cells selectable (CELLS pin, 4.2 V or 8.4 V)	Stand-alone	bq24103A
1 or 2 cells selectable (CELLS pin, 4.2 V or 8.4 V) (Blinking status pins)	Stand-alone	bq24104
Externally programmable (2.1 V to 15.5 V)	Stand-alone	bq24105
4.2 V (Blinking status pins)	Stand-alone	bq24108
4.2 V (Blinking status pins)	Stand-alone	bq24109
1 or 2 cells selectable (CELLS pin, 4.2 V or 8.4 V)	System-controlled	bq24113
1 or 2 cells selectable (CELLS pin, 4.2 V or 8.4 V)	System-controlled	bq24113A
Externally programmable (2.1 V to 15.5 V)	System-controlled	bq24115

(1) The RHL package is available in the following options:
T – taped and reeled in quantities of 250 devices per reel
R – taped and reeled in quantities of 3000 devices per reel

(2) This product is RoHS-compatible, including a lead concentration that does not exceed 0.1% of total product weight, and is suitable for use in specified lead-free soldering processes.

(3) T_J = –40°C to 125°C

6 Pin Configuration and Functions

RHL Package

20-Pin VQFN

Top View

bq24100 bq24103 bq24103A bq24104 bq24105 bq24108 bq24109 bq24113 bq24113A bq24115 pinout_lus606.gif

bq24100, 03, 03A, 04, 05, 08, 09, 13, 13A, 15

Pin Functions

PIN						I/O	DESCRIPTION
NAME	bq24100, bq24108, bq24109	bq24103, bq24103A bq24104	bq24105	bq24113, bq24113A	bq24115	I/O	DESCRIPTION
BAT	14	14	14	14	14	I	Battery voltage sense input. Bypass it with a 0.1 μF capacitor to PGND if there are long inductive leads to battery.
CE	16	16	16	16	16	I	Charger enable input. This active low input, if set high, suspends charge and places the device in the low-power sleep mode. Do not pull up this input to VTSB.
CELLS		13		13		I	Available on parts with fixed output voltage. Ground or float for single-cell operation (4.2 V). For two-cell operation (8.4 V) pull up this pin with a resistor to V_CC.
CMODE				7	7	I	Charge mode selection: low for precharge as set by ISET2 pin and high (pull up to VTSB or <7 V) for fast charge as set by ISET1.
FB			13		13	I	Output voltage analog feedback adjustment. Connect the output of a resistive voltage divider powered from the battery terminals to this node to adjust the output battery voltage regulation.
IN	3, 4	3, 4	3, 4	3, 4	3, 4	I	Charger input voltage.
ISET1	8	8	8	8	8	I/O	Charger current set point 1 (fast charge). Use a resistor to ground to set this value.
ISET2	9	9	9	9	9	I/O	Charge current set point 2 (precharge and termination), set by a resistor connected to ground. A low-level CMODE signal selects the ISET2 charge rate, but if the battery voltage reaches the regulation set point, bqSWITCHER™ changes to voltage regulation regardless of CMODE input.
N/C	13			19	19	-	No connection. This pin must be left floating in the application.
OUT	1	1	1	1	1	O	Charge current output inductor connection. Connect a zener TVS diode between OUT pin and PGND pin to clamp the voltage spike to protect the power MOSFETs during abnormal conditions.
OUT	20	20	20	20	20	O
PG	5	5	5	5	5	O	Power-good status output (open drain). The transistor turns on when a valid V_CC is detected. It is turned off in the sleep mode. PG can be used to drive a LED or communicate with a host processor.
PGND	17,18	17,18	17,18	17,18	17, 18		Power ground input
SNS	15	15	15	15	15	I	Charge current-sense input. Battery current is sensed via the voltage drop developed on this pin by an external sense resistor in series with the battery pack. A 0.1-μF capacitor to PGND is required.
STAT1	2	2	2	2	2	O	Charge status 1 (open-drain output). When the transistor turns on indicates charge in process. When it is off and with the condition of STAT2 indicates various charger conditions (See Table 1)
STAT2	19	19	19			O	Charge status 2 (open-drain output). When the transistor turns on indicates charge is done. When it is off and with the condition of STAT1 indicates various charger conditions (See Table 1)
TS	12	12	12	12	12	I	Temperature sense input. This input monitors its voltage against an internal threshold to determine if charging is allowed. Use an NTC thermistor and a voltage divider powered from VTSB to develop this voltage. (See Figure 4)
TTC	7	7	7			I	Timer and termination control. Connect a capacitor from this node to GND to set the bqSWITCHER™ timer. When this input is low, the timer and termination detection are disabled.
VCC	6	6	6	6	6	I	Analog device input. A 0.1 μF capacitor to VSS is required.
VSS	10	10	10	10	10		Analog ground input
VTSB	11	11	11	11	11	O	TS internal bias regulator voltage. Connect capacitor (with a value between a 0.1-μF and 1-μF) between this output and VSS.
Exposed Thermal Pad	Pad	Pad	Pad	Pad	Pad		There is an internal electrical connection between the exposed thermal pad and VSS. The exposed thermal pad must be connected to the same potential as the VSS pin on the printed circuit board. The power pad can be used as a star ground connection between V_SS and PGND. A common ground plane may be used. VSS pin must be connected to ground at all times.