bq25050 Charger Datasheet

bq25050 Datasheet, PDF, Equivalent


Part Number

bq25050

Description

Single Cell Li-Ion Battery Charger

Manufacture

etcTI

Total Page 30 Pages
Datasheet
Download bq25050 Datasheet


bq25050
bq25050
www.ti.com
SLUSA33 – MARCH 2010
1A, Single-Input, Single Cell Li-Ion Battery Charger with 50-mA LDO, External Power Path
Control, and Single Input Interface
Check for Samples: bq25050
FEATURES
1
• 30V input Rating, With 10.5V Over-Voltage
Protection (OVP)
• FET Controller for External Battery FET for
External Power Path Control (BGATE)
• Input Voltage Dynamic Power Management
• 50mA integrated Low Dropout Linear
Regulator (LDO)
• Programmable Charge Current Through Single
Input Interface (CTRL)
• 0.5% Battery Voltage Regulation Accuracy
• 7% Charge Current Regulation Accuracy
• Thermal Regulation and Protection
• Battery NTC Monitoring During Charge and
Discharge
• Status Indication – Charging/Done and
Temperature Faults
• Available in small 2mm × 3mm 10 Pin SON
Package
APPLICATIONS
• Smart Phones
• Mobile Phones
• Portable Media Players
• Low Power Handheld Devices
TYPICAL APPLICATION CIRCUIT
DESCRIPTION
The bq25050 is a highly integrated Li-Ion linear
battery charger targeted at space-limited portable
applications. It operates from either a USB port or AC
Adapter and charges a single-cell Li-Ion battery with
up to 1A of charge current. The 30V input voltage
range with input over-voltage protections supports
low-cost unregulated adapters.
The bq25050 has a single power output that charges
the battery. The system load is connected to OUT.
The low-battery system startup circuitry maintains
OUT greater than 3.4V whenever an input source is
connected. This allows the system to start-up and run
whenever an input source is connected regardless of
the battery voltage. The charge current is
programmable up to 1A using the CTRL input.
Additionally, a 4.9V 50mA LDO is integrated into the
IC for supplying low power external circuitry.
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. 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.
USB or Adaptor
VBUS
D+
D-
GND
C1
0.1uF
R1
1 kΩ
1 IN
bq25050
CHG 8
OUT 10
7 CTRL
2 IMON
BGATE 9
BAT 6
TS 5
3 VSS
LDO 4
VGPIO
R2
100kΩ
C2
1uF
VGPIO
STATUS
VDD
QBAT
HOST
TEMP
PACK+
C4
0.1uF
C3
0.1uF
PACK -
VLDO
ISENSE
GPIO
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.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2010, Texas Instruments Incorporated

bq25050
bq25050
SLUSA33 – MARCH 2010
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
PART NO.
bq25050DQCR
bq25050DQCT
ORDERING INFORMATION
MARKING
MEDIUM
DAM
Tape and Reel
DAM
Tape and Reel
QUANTITY
3000
250
PACKAGE DISSIPATION RATINGS TABLE
PACKAGE
RqJA
10 Pin 2mm × 3mm SON(1)
58.7°C/W (2)
RqJC
3.9°C/W
TA < 25°C POWER
RATING
1.70W
DERATING FACTOR
ABOVE TA = 25°C
0.017W/°C
(1) Maximum power dissipation is a function of TJ(max), RqJA, and TA. The maximum allowable power dissipation at any allowable ambient
temperature is PD = [TJ(max) - TA]/RqJA.
(2) This data is based on using the JEDEC High-K board and the exposed die pad is connected to a Cu pad on the board. The pad is
connected to the ground plane by a 2×3 via matrix.
ABSOLUTE MAXIMUM RATINGS(1)
over operating free-air temperature range (unless otherwise noted)
VALUE / UNIT
Input Voltage
IN (with respect to VSS)
CTRL, TS, CHG, BGATE (with respect to VSS)
–0.3 to 30 V
–0.3 to 7 V
Output Voltage
BAT, OUT, LDO, CHG, BGATE, IMON (with respect to VSS)
–0.3 to 7 V
Input Current (Continuous)
IN
1.2 A
Output Current (Continuous)
BAT
1.2 A
Output Current (Continuous)
LDO
100 mA
Output Sink Current
CHG
5 mA
Junction temperature, TJ
Storage temperature, TSTG
–40°C to 150°C
–65°C to 150°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. All voltage
values are with respect to the network ground terminal unless otherwise noted.
RECOMMENDED OPERATING CONDITIONS
over operating free-air temperature range (unless otherwise noted)
IN voltage range
VIN IN operating voltage range
IIN Input current, IN
IOUT Ouput Current in charge mode, OUT
TJ Junction Temperature
MIN MAX UNITS
3.55 28
V
4.4 10.2
1A
1A
0 125 °C
ELECTRICAL CHARACTERISTICS
Over junction temperature range 0°C TJ 125°C and VIN = 5V (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
INPUT
VUVLO
VHYS-UVLO
Under-voltage lock-out
Hysteresis on UVLO
VIN: 0V 4V
VIN: 4V 0V
3.25
TYP
3.30
250
MAX UNITS
3.55
V
mV
2 Submit Documentation Feedback
Product Folder Link(s): bq25050
Copyright © 2010, Texas Instruments Incorporated


Features bq25050 www.ti.com SLUSA33 – MARCH 2 010 1A, Single-Input, Single Cell Li-I on Battery Charger with 50-mA LDO, Exte rnal Power Path Control, and Single In put Interface Check for Samples: bq250 50 FEATURES 1 • 30V input Rating, Wi th 10.5V Over-Voltage Protection (OVP) • FET Controller for External Battery FET for External Power Path Control (B GATE) • Input Voltage Dynamic Power M anagement • 50mA integrated Low Dropo ut Linear Regulator (LDO) • Programma ble Charge Current Through Single Input Interface (CTRL) • 0.5% Battery Volt age Regulation Accuracy • 7% Charge C urrent Regulation Accuracy • Thermal Regulation and Protection • Battery N TC Monitoring During Charge and Dischar ge • Status Indication – Charging/D one and Temperature Faults • Availabl e in small 2mm × 3mm 10 Pin SON Packag e APPLICATIONS • Smart Phones • Mob ile Phones • Portable Media Players Low Power Handheld Devices TYPICAL A PPLICATION CIRCUIT DESCRIPTION The bq25050 is a highly integrated Li-Ion linear battery charger t.
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