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bq24745 Datasheet Preview

bq24745 Datasheet

SMBus-Controlled Multi-Chemistry Battery Charger

No Preview Available !

Not Recommended for New Designs (NRND)
www.ti.com
bq24745
SLUS761D DECEMBER 2007 REVISED OCTOBER 2011
SMBus-Controlled Multi-Chemistry Battery Charger With Input
Current Detect Comparator and Charge Enable Pin
Check for Samples: bq24745
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
Input Current Comparator, With Adjustable
Threshold and Hysteresis
Internal Soft-Start
Safety
Dynamic Power Management (DPM)
Up to 19.2-V Battery Voltage
7-V24-V AC/DC-Adapter Operating Range
Simplified SMBus Control Interface
Charge Voltage DAC (1.024 V19.2 V)
Charge Current DAC (128 mA8.064 A)
Adapter Current Limit DPM DAC (256
mA11.008 A)
Status and Monitoring Outputs
AC/DC Adapter Present With Adjustable
Voltage Threshold
Input Current Comparator With Adjustable
Threshold and Hysteresis
Current Sense Amplifier for Current Drawn
From Input Source
Charge Any Battery Chemistry: Li+, NiCd,
NiMH, Lead Acid, Etc.
Charge Enable Pin
• < 10-μA Battery Current With Adapter
Removed
• < 1-mA Input DCIN Current With Adapter
Present and Charge Disabled
28-Pin, 5-mm × 5-mm QFN Package
APPLICATIONS
Notebook and Ultra-Mobile Computers
Portable Data-Capture Terminals
Portable Printers
Medical Diagnostics Equipment
Battery Bay Chargers
Battery Backup Systems
DESCRIPTION
The bq24745 is a high-efficiency, synchronous
battery charger with an integrated input-current
comparator, offering low component count for
space-constrained, multi-chemistry battery-charging
applications. The input-current, charge-current, and
charge-voltage DACs allow very high regulation
accuracies that can be easily programmed by the
system power-management microcontroller using the
SMBus interface. The bq24745 charges two, three, or
four series Li+ cells, and is available in a 28-pin,
5-mm × 5 mm QFN package.
ICREF 1
ACIN 2
VREF 3
EAO 4
EAI 5
FBO 6
CE 7
28 27 26 25 24 23 22
bq24745
28 LD QFN
TOP VIEW
21 VDDP
20 LGATE
19 PGND
18 CSOP
17 CSON
16 NC
15 VFB
8 9 10 11 12 13 14
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 © 20072011, Texas Instruments Incorporated




etcTI

bq24745 Datasheet Preview

bq24745 Datasheet

SMBus-Controlled Multi-Chemistry Battery Charger

No Preview Available !

Not Recommended for New Designs (NRND)
bq24745
SLUS761D DECEMBER 2007 REVISED OCTOBER 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 bq24745 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 adaptor 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, allowing monitoring the overall system power. If the adapter
current is above the programmed low-power threshold, a signal is sent to host so that the system optimizes its
performance to the power available from the adapter. An integrated comparator monitors the input current
through the current-sense amplifier, and indicates when the input current exceeds a programmable threshold
limit.
TYPICAL APPLICATIONS
VIN = 20 V, VBAT = 4-cell Li-Ion, ICHARGE = 4.5 A
ADAPTER +
ADAPTER -
RC1
2.2Ω
C1
2.2u
R1
309k
1%
Q1 (ACFET) Q2 (RBFET)
SI4835BDY SI4835BDY
RC6
10Ω
P
Controlled by
HOST
C2
0.1u
C6
1u
P
RAC
0.010
C3
0.1u
R2
49.9k
1%
+3.3V_ALWAYS
OR
+5V_ALWAYS
R3
10k
27 CSSN
28 CSSP
22 DCIN
2 ACIN
12 GND
UGATE 24
bq24745 PHASE 23
11 VDDSMB
BOOT 25
D1
VDDP 21
13 ACOK
DISCRETE
LOGIC
R10 R11
10k 10k
3 VREF
C4 1uF
LGATE 20
PGND 19
HOST
(EC)
Dig I/O
SMBus
R12
10k
DISCRETE
LOGIC
C5 100pF
26 ICOUT
7 CE
9 SDA
10 SCL
8 VICM
14 NC
16 NC
CSOP 18
CSON 17
VFB 15
ICREF 1
EAO 4
EAI 5
FBO 6
C14
10uF
C15
10uF
CHRG_IN
Q3
FDS6680A
C7
0.1uF
BAT 54
L1
5.6uH
C8 C10
1u 0.1uF
Q4
FDS6680A
RSR
0.010
C9
0.1uF
C13
2x10u
PACK +
PACK -
R22
100 Ω
C17
0.1uF
C23
51pF
R19
7.5k
C21 R21 R20
2000pF 200k 20k
C22
130pF
(1) Pullup rail could be either VREF or other system rail.
Figure 1. Typical System Schematic Using External Input-Current Comparator (Discrete Logic) Instead of
Internal Comparator
2 Submit Documentation Feedback
Product Folder Link(s) :bq24745
Copyright © 20072011, Texas Instruments Incorporated


Part Number bq24745
Description SMBus-Controlled Multi-Chemistry Battery Charger
Maker etcTI
Total Page 30 Pages
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