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Datasheet bq24742 PDF ( 特性, スペック, ピン接続図 )

部品番号 bq24742
部品説明 Li-Ion or Li-Polymer Battery Charger
メーカ Texas
ロゴ Texas ロゴ 
プレビュー
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bq24742 Datasheet, bq24742 PDF,ピン配置, 機能
bq24741, bq24742
www.ti.com
SLUS875B – MARCH 2009 – REVISED OCTOBER 2009
Li-Ion or Li-Polymer Battery Charger with Low Iq and Accurate Trickle Charge
Check for Samples :bq24741 bq24742
FEATURES
1
• NMOS-NMOS Synchronous Buck Converter
• Resistor-Programmable Switching Frequency
between 300 kHz and 800 kHz
• 9 V-24 V Input Voltage Operation Range
• Support Two to Four Cells
• Analog Inputs with Ratiometric Programming
via Resistors or DAC/GPIO
– Charge Voltage (4-4.512 V/cell)
– Charge Current (up to 10 A)
– Adapter Current Limit for DPM
• 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
• 150 mA Trickle-charge Current with ±33%
Accuracy Down to Zero Battery Voltage
• Safety Protection
– Input Overvoltage Protection
– Battery Overvoltage Protection
– Charger Overcurrent Protection
– Thermal Shutdown Protection
– FET/Inductor/Battery Short Protection
• Status and Monitoring Outputs
– Adapter Present Indicator
– Programmable Input Power Detect with
Adjustable Threshold
– Dynamic Power Management (DPM) with
Status Indicator
– Current Drawn from Input Source
• Charge Enable Pin
• Internal Soft-Start and Loop Compensation
• 25 ns Minimum Driver Dead-Time and 99.5%
Maximum Effective Duty Cycle
• 28-pin, 5x5-mm2 QFN package
• Energy Star Low Quiescent Current Iq
– < 10 μA Off-State Battery Discharge Current
– < 1.5 mA Off-State Input Quiescent Current
APPLICATIONS
• Notebook and Ultra-Mobile PC
• Portable Data Capture Terminals
• Portable Printers
• Medical Diagnostics Equipment
• Battery Bay Chargers
• Battery Back-up Systems
DESCRIPTION
The bq24741/2 is a high-efficiency, synchronous
battery charger with integrated compensation,
offering low component count for space-constrained
Li-ion or Li-polymer 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.
The bq24741/2 charges two, three, or four series Li+
cells, supporting up to 10 A of charge current, and is
available in a 28-pin, 5x5-mm2 thin QFN package.
Text for space
Text for space
CE 1
ACN 2
ACP 3
LPMOD 4
ACDET 5
ACSET 6
LPREF 7
28 27 26 25 24 23 22
bq24741/2
QFN-28
TOP VIEW
21 DPMDET
20 CELLS
19 CSP
18 CSN
17 BAT
16 ISET
15 IADAPT
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 © 2009, Texas Instruments Incorporated

1 Page



bq24742 pdf, ピン配列
www.ti.com
Text for space
ADAPTER +
ADAPTER -
R11
C1
2.2 µF
PP
Q1 (ACFET) Q2 (ACFET)
SI4435
SI4435
Controlled by
HOST
C2
R1
432 kΩ
0.1 µF
1%
RAC
0.010 Ω
C3
0.1 µF
EXTPWR
R2
66.5 kΩ
1%
VREF
R3
10 kΩ
R4
10 kΩ
R5
10 kΩ
GPIO
C4
1 µF
HOST
ISET _PWM
(D = 0.72, Vpeak = VDAC)
DAC
ADC
R15
10 kΩ
120 kΩ
R14
C13
100 nF
C5
100 pF
bq24741, bq24742
SLUS875B – MARCH 2009 – REVISED OCTOBER 2009
R16
10 Ω
D2
BAT54
C6 C7
10 µF 10 µF
SYSTEM
ACN
ACP
PVCC
ACDET bq24741/2
AGND
HIDRV
EXTPWR
VREF
SW
BTST
REGN
TRICKLE
DPMDET
LPMOD
CELLS
CE
VDAC
ISET
LODRV
PGND
CSP
CSN
BAT
ACSET
VADJ
IADAPT PowerPad
LPREF
FSET
C8
0.1 µF
C9
D1 BAT54 0.1 µF
C10
1 µF
Q3 (BATFET)
SI4435
Controlled by
HOST
Q4_A
FDS8978
L1
P
RSR
0.020 Ω
4.7 µH
C11
10 µF
C13
0.1 µF
Q4_B
FDS8978
C14
0.1 µF
R6
56.2 kΩ
VREF
R7
73.2 kΩ
1%
R8
26.7 kΩ
1%
C15
0.1 µF
C12
10 µF
PACK+
PACK-
Text for space
(1) Pull-up rail could be either VREF or other system rail.
(2) SRSET/ACSET could come from either DAC or resistor dividers.
FS = 650 kHz, 90 W Adapter, VADAPTER = 19 V, VBAT = 3-cell Li-Ion (4.2V/cell), Icharge = 3.6 A, Iadapter_limit = 4.0 A
Figure 2. Typical System Schematic, Voltage and Current Programmed by DAC
Part number
bq24741
bq24742
ORDERING INFORMATION
Package
Ordering Number
(Tape and Reel)
28-PIN 5 x 5 mm2 QFN
bq24741RHDR
bq24741RHDT
28-PIN 5 x 5 mm2 QFN
bq24742RHDR
bq24742RHDT
Quantity
3000
250
3000
250
PACKAGE THERMAL DATA
PACKAGE
QFN – RHD(1) (2)
θJA
39°C/W
TA = 25°C POWER RATING
2.36 W
DERATING FACTOR ABOVE TA = 25°C
0.028 W/°C
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
Web site at www.ti.com.
(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. This is
connected to the ground plane by a 2x3 via matrix.
Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s) :bq24741 bq24742
Submit Documentation Feedback
3


3Pages


bq24742 電子部品, 半導体
bq24741, bq24742
SLUS875B – MARCH 2009 – REVISED OCTOBER 2009
RECOMMENDED OPERATING CONDITIONS
over operating free-air temperature range (unless otherwise noted)
SW
PVCC, ACP, ACN, CSP, CSN, BAT
REGN, LODRV
Voltage range
VREF
VDAC
VADJ, ACSET, ISET, ACDET, FSET, IADAPT, LPMOD, LPREF, CE, CELLS,
EXTPWR, DPMDET, TRICKLE
BTST, HIDRV with respect to AGND and PGND
AGND, PGND
Maximum difference voltage: ACP–ACN, CSP–CSN
Junction temperature range
Storage temperature range
www.ti.com
MIN NOM MAX UNIT
–0.8 24 V
0 24 V
0 6.5 V
3.3 V
3.6 V
0 5.5 V
0 30 V
–0.3 0.3 V
–0.3 0.3 V
–40 125 °C
–55 150 °C
ELECTRICAL CHARACTERISTICS
9.0 V VPVCC 24 V, 0°C < TJ < +125°C, Fs=600 kHz, typical values are at TA = 25°C, with respect to AGND (unless
otherwise noted) (1) (2) (3)
PARAMETER
TEST CONDITIONS
OPERATING CONDITIONS
VPVCC_OP
PVCC input voltage operating range
CHARGE VOLTAGE REGULATION
VBAT_REG_RNG
VVDAC_OP
VVADJ_OP
BAT voltage regulation range
VDAC reference voltage range
VADJ voltage range
4-4.512 V per cell, times 2,3,4 cells
8 V, 8.4 V, 9.024 V
Charge voltage regulation accuracy
12 V, 12.6 V, 13.536 V
16 V, 16.8 V, 18.048 V
CHARGE CURRENT REGULATION (ENABLE CE & DISABLE TRICKLE)
VIREG_CHG
Charge current regulation differential
voltage range
VIREG_CHG = VCSP – VCSN
VISET_OP
SRSET voltage range
VIREG_CHG = 40 mV
VIREG_CHG = 20 mV
Charge current regulation accuracy
VIREG_CHG = 5 mV
VIREG_CHG = 3 mV (VBAT 4 V)
VIREG_CHG = 3 mV (VBAT < 4 V)
Off-set Voltage of Amplifier
VBAT 4 V
VBAT < 4 V
TRICKLE CHARGE CURRENT REGULATION (ENABLE CE & TRICKLE)
Charge Current Regulation Accuracy
Off-set Voltage of Amplifier
VIREG_CHG = 3 mV
MIN TYP MAX UNIT
9 24 V
8
2.6
0
–0.5
–0.5
–0.5
18.048
3.6
VDAC
0.5
0.5
0.5
V
V
V
%
0
0
–3%
–5%
–25%
–33%
–50%
–1.0
–1.5
100 mV
VDAC
3%
5%
25%
33%
50%
1.0
1.5
V
mV
–33%
–1.0
33%
1.0
mV
(1) Verified by design
(2) Deglitch time and delay are proportional to the period of oscillator, unless specified.
(3) When CE=HIGH, the internal oscillator frequency is equal to external setting Fs; when CE=LOW, the internal oscillator frequency is fixed
internal setting 700 kHz.
6 Submit Documentation Feedback
Product Folder Link(s) :bq24741 bq24742
Copyright © 2009, Texas Instruments Incorporated

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