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bq24751A Datasheet Preview

bq24751A Datasheet

Host-controlled Multi-Chemistry Battery Charger

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bq24751A
www.ti.com............................................................................................................................................. SLUS756C – SEPTEMBER 2007 – REVISED MARCH 2009
Host-controlled Multi-Chemistry Battery Charger With System Power Selector, AC
Over-Power Protection, Programmable OVP and Low Iq
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
– Programmable 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
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
– Current Drawn from Input Source
Battery Learn Cycle Control
Supports Any Battery Chemistry: Li+, NiCd,
NiMH, Lead Acid, etc.
Charge Enable
28-pin, 5x5-mm QFN package
Energy Star Low Iq
– < 10-µA Off-State Battery Discharge Current
– < 1.5-mA Off-State Input Quiescent Current
APPLICATIONS
Notebook and Ultra-Mobile Computers
Portable Data Capture Terminals
Portable Printers
Medical Diagnostics Equipment
Battery Bay Chargers
Battery Back-up Systems
DESCRIPTION
The bq24751A 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 very high regulation
accuracies, and can be either hardwired with resistors
or programmed by the system power-management
microcontroller using a DAC or GPIOs.
The bq24751A 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 thin QFN package.
CHGEN
ACN
ACP
ACDRV
ACDET
ACSET
ACOP
28 27 26 25 24 23 22
1 21
2 20
3
bq24751A
19
4
28 LD QFN
18
5
TOP VIEW
17
6 16
7 15
8 9 10 11 12 13 14
LEARN
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 © 2007–2009, Texas Instruments Incorporated




etcTI

bq24751A Datasheet Preview

bq24751A Datasheet

Host-controlled Multi-Chemistry Battery Charger

No Preview Available !

bq24751A
SLUS756C – SEPTEMBER 2007 – 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 bq24751A 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 bq24751A 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 -
ACGOOD
R10
2Ω
C1
2.2 µF
P
Q1 (ACFET)
SI4435
P
Q2 (ACFET)
SI4435
C2
0.1 µF
RAC
0.010 Ω
C3
0.1 µF
R1
432 kΩ
1%
R3
422 kΩ
1%
DAC
R2
66.5 kΩ
1%
VREF
R5
10 kΩ
R4
71 kΩ
1%
HOST
GPIO
C4
1 µF
DAC
ADC
C5
100 pF
ACN
PVCC
ACP
ACDRV
ACDET
AGND
BATDRV
HIDRV
bq24751A PH
ACGOOD
BTST
OVPSET
REGN
SRSET
ACSET
VREF
LEARN
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
(1) Pull-up rail could be either VREF or other system rail.
(2) SRSET/ACSET could come from either DAC or resistor dividers.
VIN = 20 V, VBAT = 3-cell Li-Ion, Icharge = 3 A, Iadapter_limit = 4 A
Figure 1. Typical System Schematic, Voltage and Current Programmed by DAC
2 Submit Documentation Feedback
Product Folder Link(s) :bq24751A
Copyright © 2007–2009, Texas Instruments Incorporated


Part Number bq24751A
Description Host-controlled Multi-Chemistry Battery Charger
Maker etcTI
Total Page 30 Pages
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