TI1 BQ24212DQCT 800ma, single-input, single cell li-ion battery solar charger Datasheet

bq24212
SLUSAL3 – AUGUST 2011
www.ti.com
800mA, Single-Input, Single Cell Li-Ion Battery Solar Charger
Check for Samples: bq24212
FEATURES
APPLICATIONS
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1
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Smart Phones
PDAs
MP3 Players
Low-Power Handheld Devices
Auxiliary Solar Chargers
DESCRIPTION
The bq24212 is a highly integrated Li-ion linear
charger
targeted
at
space-limited
portable
applications. The high input voltage range with input
over-voltage protection supports low-cost unregulated
adapters. The input voltage regulation loop with
programmable input voltage regulation threshold
make it suitable for charging from alternative power
sources, such as solar panel or inductive charging
pad.
The IC has a single power output that charges the
battery. A system load can be placed in parallel with
the battery as long as the average system load does
not keep the battery from charging fully during the 10
hour safety timer.
The battery is charged in three phases: conditioning,
constant current and constant voltage. In all charge
phases, an internal control loop monitors the IC
junction temperature and reduces the charge current
if an internal temperature threshold is exceeded.
bq24212
20V BAT
7V
Charging
Source
1
System
10
VBUS
1mF
CHG
8
PG
6
`
7
VTSB
MODE
1mF
4
RT1
PACK+
TS
Host
VDPM
9
ISET
2
5
TEMP
VSS
3
PACK-
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCT PREVIEW information concerns products in the
formative or design phase of development. Characteristic data and
other specifications are design goals. Texas Instruments reserves
the right to change or discontinue these products without notice.
Copyright © 2011, Texas Instruments Incorporated
PRODUCT PREVIEW
•
Input Voltage Dynamic Power Management
Feature (VBUS_DPM)
Selectable Battery Tracking Mode to Maximize
the Charge Rate from Solar Panel Using DPM
Feature
Load Mode to Support Loads Connected at
VBUS Pin
20V Input Rating, with Over-Voltage Protection
(OVP)
1% Battery Voltage Regulation Accuracy
Up to 800mA Charge Current with 10% Charge
Current Accuracy
Thermal Regulation Protection for Output
Current Control
Low Battery Leakage Current
BAT Short-Circuit Protection
NTC Input Monitoring
Built-In Safety Timer With Reset Control
Status Indication – Charging/Power Present
Available in Small 2mm × 3mm SON-10
Package
bq24212
SLUSAL3 – AUGUST 2011
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
DESCRIPTION (CONTINUED)
The charger power stage and charge current sense functions are fully integrated. The charger function has high
accuracy current and voltage regulation loops, charge status display, and charge termination function. The
charge current value is programmable via an external resistor.
Furthermore, the IC has a Load Mode that connects the battery to VBUS pin with current limiting function to
prevent over load. To use Load Mode, the charging source would be removed from the VBUS pin. Then a load
can be placed on VBUS pin and it will be near the VBAT pin voltage.
PIN CONFIGURATION
Figure 1. DQC PACKAGE
Top View
1 VBUS
BAT 10
PRODUCT PREVIEW
2 ISET
VDPM 9
3 VSS
CHG 8
4 VTSB
5 TS
MODE 7
PG 6
PIN FUNCTIONS
PIN
NAME
NO.
VBUS
1
I/O
I/O
DESCRIPTION
For Charging Mode, input for charging source, connect to external DC supply (ie Solar Panel, Inductive
charging PAD, or Wall Adapter)
For Load Mode, output for current limited battery voltage. Expected range of bypass capacitors 1µF to 10µF,
connected from VBUS to VSS.
BAT
10
I/O
VDPM
9
I
Programs the input voltage regulation threshold. Expected range of programming resistor is 1k to 10kΩ,
connected from VDPM to VSS. When VDPM is floating, the VIN DPM loop operates in battery tracking mode,
and the VIN DPM threshold is BAT+100mV (BAT>3.6V) or 3.7V (BAT≤3.6V) in this case. VIN DPM threshold
should be programmed higher than battery voltage to ensure proper operation.
ISET
2
I
Programs the Fast-charge current setting. External resistor from ISET to VSS defines fast charge current value.
PG
6
O
Power Present indication. LOW (FET ON) When input voltage is in normal range (VBUS>BAT & VBUS>UVLO),
High impedance (open drain FET OFF) in other cases.
TS
5
I
Temperature sense pin, connected to NTC Thermistor in the battery pack. Pulling High puts part in Limited
Power charging mode. Must not be left floating.
VSS
3
–
Ground terminal
CHG
8
O
Charge Status indication, Low (FET ON) indicates charging, and High impedance (open drain FET OFF) in
other cases
MODE
7
I
Mode control. Low to enable Charge Mode or High to enable Load mode.
VTSB
4
O
TS bias reference voltage pin, regulated output. No external capacitor is required from VTSB to VSS. Only
enabled during charge.
Thermal
PAD and
Package
–
–
There is an internal electrical connection between the exposed thermal pad and the VSS pin of the device. The
thermal pad must be connected to the same potential as the VSS pin on the printed circuit board. Do not use
the thermal pad as the primary ground input for the device. VSS pin must be connected to ground at all times.
2
Battery Connection. System Load may be connected. Expected range of bypass capacitors 1μF to 10μF,
connected from BAT to VSS.
Copyright © 2011, Texas Instruments Incorporated
bq24212
SLUSAL3 – AUGUST 2011
www.ti.com
TYPICAL SOLAR APPLICATION CIRCUIT
bq24212
20V BAT
7V
Charging
Source
1
System
10
VBUS
1mF
CHG
8
PG
6
`
7
MODE
VDPM
9
ISET
2
VTSB
4
TS
5
PACK+
Short for Limited
Power Charging Mode
VSS
3
Open for Battery
Tracking Mode
PACK-
PRODUCT PREVIEW
Tied Low to enable
Charge Mode Only
1mF
Figure 2. Typical System Schematic for Solar Charger Application
bq24212
20V BAT
7V
Charging
Source
1
System
Load
10
VBUS
1mF
CHG
8
PG
6
`
Tied Low to enable
Charge Mode Only
7
MODE
VTSB
4
TS
5
1mF
PACK+
VDPM
9
Open for Battery
Tracking Mode
ISET
2
VSS
Short for Limited
Power Charging Mode
3
PACK-
Figure 3. System Schematic for Solar Charger Application with Minimum Components
Copyright © 2011, Texas Instruments Incorporated
3
To request a full data sheet, please send an email to:
[email protected].
PACKAGE OPTION ADDENDUM
www.ti.com
17-Aug-2012
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package
Drawing
Pins
Package Qty
Eco Plan
(2)
BQ24212DQCR
PREVIEW
WSON
DQC
10
3000
Green (RoHS
& no Sb/Br)
BQ24212DQCT
PREVIEW
WSON
DQC
10
250
TBD
Lead/
Ball Finish
MSL Peak Temp
(3)
Samples
(Requires Login)
CU NIPDAU Level-2-260C-1 YEAR
Call TI
Call TI
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
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Addendum-Page 1
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