bq24750 Charger Datasheet

bq24750 Datasheet, PDF, Equivalent


Part Number

bq24750

Description

Host-Controlled Multi-Chemistry Battery Charger

Manufacture

etcTI

Total Page 30 Pages
Datasheet
Download bq24750 Datasheet


bq24750
bq24750
www.ti.com............................................................................................................................................... SLUS735D – DECEMBER 2006 – REVISED MARCH 2009
Host-Controlled Multi-Chemistry Battery Charger With Integrated System Power Selector
and AC Overpower Protection
FEATURES
1
NMOS-NMOS Synchronous Buck Converter
with 300 kHz Frequency and >95% Efficiency
30-ns Minimum Driver Dead-time and 99.5%
Maximum Effective Duty Cycle
High-Accuracy Voltage and Current Regulation
– ±0.5% Charge Voltage Accuracy
– ±3% Charge Current Accuracy
– ±3% Adapter Current Accuracy
– ±2% Input Current Sense Amp Accuracy
Integration
– Automatic System Power Selection From
AC/DC Adapter or Battery
– Internal Loop Compensation
– Internal Soft Start
Safety
– Input Overvoltage Protection (OVP)
– Dynamic Power Management (DPM) with
Status Indicator
– Programmable Inrush Adapter Power
(ACOP) and Overcurrent (ACOC) Limits
– Reverse-Conduction Protection Input FET
– Battery Thermistor Sense Input (TS) for
Charge Qualification
Supports Two, Three, or Four Li+ Cells
5–24 V AC/DC-Adapter Operating Range
Analog Inputs with Ratiometric Programming
via Resistors or DAC/GPIO Host Control
– Charge Voltage (4–4.512 V/cell)
– Charge Current (up to 10 A, with 10-m
Sense Resistor)
– Adapter Current Limit (DPM)
Status and Monitoring Outputs
– AC/DC Adapter Present with Programmable
Voltage Threshold
– DPM Loop Active
– Current Drawn from Input Source
Supports Any Battery Chemistry: Li+, NiCd,
NiMH, Lead Acid, etc.
Charge Enable
10-µA Off-State Current
28-pin, 5x5-mm QFN package
APPLICATIONS
Notebook and Ultra-Mobile Computers
Portable Data-Capture Terminals
Portable Printers
Medical Diagnostics Equipment
Battery Bay Chargers
Battery Back-up Systems
DESCRIPTION
The bq24750 is a high-efficiency, synchronous
battery charger with integrated compensation and
system power selector logic, offering low component
count for space-constrained multi-chemistry battery
charging applications. Ratiometric charge current and
voltage programming allows high regulation
accuracies, and can be either hardwired with resistors
or programmed by the system power-management
microcontroller using a DAC or GPIOs.
CHGEN
ACN
ACP
ACDRV
ACDET
ACSET
ACOP
28 27 26 25 24 23 22
1 21
2 20
3
bq24750
19
4
28 LD QFN
18
TOP VIEW
5 17
6 16
7 15
8 9 10 11 12 13 14
DPMDET
CELLS
SRP
SRN
BAT
SRSET
IADAPT
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 © 2006–2009, Texas Instruments Incorporated

bq24750
bq24750
SLUS735D – DECEMBER 2006 – REVISED MARCH 2009............................................................................................................................................... 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 bq24750 charges two, three, or four series Li+ cells, supporting up to 10 A of charge current, and is
available in a 28-pin, 5x5-mm QFN package.
The bq24750 controls external switches to prevent battery discharge back to the input, connect the adapter to
the system, and to connect the battery to the system using 6-V gate drives for better system efficiency. For
maximum system safety, inrush-power limiting provides instantaneous response to high input voltage multiplied
by current. This AC Over-Power protection (ACOP) feature limits the input-switch power to the programmed level
on the ACOP pin, and latches off if the high-power condition persists to prevent overheating.
The bq24750 features Dynamic Power Management (DPM) and input power limiting. These features reduce
battery charge current when the input power limit is reached to avoid overloading the AC adapter when supplying
the load and the battery charger simultaneously. A highly-accurate current-sense amplifier enables precise
measurement of input current from the AC adapter to monitor the overall system power.
ADAPTER +
ADAPTER -
R10
2Ω
C1
2.2 µF
R1
P
Q1 (ACFET)
SI4435
432 kΩ
1%
P
Q2 (ACFET)
SI4435
C2
0.1 µF
RAC
0.010 Ω
C3
0.1 µF
ACGOOD
PACK
THERMISTER
SENSE
66.5 kΩ
R2 1%
VREF
R3
5.6 kΩ
1%
VREF
R5
10 kΩ
DAC
R4
118 kΩ
1%
HOST
GPIO
R6
10 kΩ
C4
1 µF
DAC
ADC
C5
100 pF
ACN
PVCC
ACP
ACDRV
ACDET
AGND
BATDRV
HIDRV
bq24750
ACGOOD
TS
PH
BTST
REGN
SRSET
ACSET
VREF
DPMDET
CELLS
CHGEN
VDAC
VADJ
IADAPT
LODRV
PGND
SRP
SRN
BAT
ACOP
PowerPad
C6 C7
10 µF 10 µF
SYSTEM
C8
0.1 µF
Q4
FDS6680A
L1
8.2 µH
P
RSR
0.010 Ω
D1
BAT54
C10
1 µF
C9
0.1 µF
C11
10 µF
C13
Q5 0.1 µF
FDS6680A
C14
0.1 µF
Q3(BATFET)
SI4435
C12
10 µF
PACK+
PACK-
C16
0.47 µF
C15
0.1 µF
A. VIN= 20 V, VBAT = 3-cell Li-Ion, ICHARGE = 3 A, IADAPTER_LIMIT = 4 A, TBAT = 0-45°C
Figure 1. Typical System Schematic, Voltage and Current Programmed by DAC
2 Submit Documentation Feedback
Product Folder Link(s) :bq24750
Copyright © 2006–2009, Texas Instruments Incorporated


Features bq24750 www.ti.com...................... ....................................... ....................................... ....................................... .... SLUS735D – DECEMBER 2006 – REV ISED MARCH 2009 Host-Controlled Multi-C hemistry Battery Charger With Integrate d System Power Selector and AC Overpowe r Protection FEATURES 1 • NMOS-NMOS Synchronous Buck Converter with 300 kHz Frequency and >95% Efficiency • 30-n s Minimum Driver Dead-time and 99.5% Ma ximum Effective Duty Cycle • High-Acc uracy Voltage and Current Regulation ±0.5% Charge Voltage Accuracy – ± 3% Charge Current Accuracy – ±3% Ada pter Current Accuracy – ±2% Input Cu rrent Sense Amp Accuracy • Integratio n – Automatic System Power Selection From AC/DC Adapter or Battery – Inter nal Loop Compensation – Internal Soft Start • Safety – Input Overvoltage Protection (OVP) – Dynamic Power Man agement (DPM) with Status Indicator – Programmable Inrush Adapter Power (ACOP) and Overcurrent (ACOC) Limits – Reverse-Conduction Protecti.
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