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PDF ISL88731 Data sheet ( Hoja de datos )
| Número de pieza | ISL88731 | |
| Descripción | SMBus Level 2 Battery Charger | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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SMBus Level 2 Battery Charger
ISL88731
The ISL88731 is a highly integrated Lithium-ion battery charger
controller, programmable over the SMBus system management
bus (SMBus). The ISL88731 is intended to be used in a smart
battery charger (SBC) within a smart battery system (SBS) that
throttles the charge power such that the current from the
AC-adapter is automatically limited. High efficiency is achieved
with a DC/DC synchronous-rectifier buck converter, equipped
with diode emulation for enhanced light load efficiency and
system bus boosting prevention. The ISL88731 charges one to
four Lithium-ion series cells, and delivers up to 8A charge
current. Integrated MOSFET drivers and bootstrap diode result
in fewer components and smaller implementation area. Low
offset current-sense amplifiers provide high accuracy with
10mΩ sense resistors. The ISL88731 provides 0.5%
end-of-charge battery voltage accuracy.
The ISL88731 provides a digital output that indicates the
presence of the AC adapter as well as an analog output which
indicates the adapter current within 4% accuracy.
The ISL88731 is available in a small 5mmx5mm 28 Ld Thin
(0.8mm) QFN package. An evaluation kit is available to reduce
design time. The ISL88731 is available in Pb-Free packages.
Pin Configuration
ISL88731
(28 LD TQFN)
TOP VIEW
Features
• 0.5% Battery Voltage Accuracy
• 3% Adapter Current Limit Accuracy
• 3% Charge Current Accuracy
• SMBus 2-Wire Serial Interface
• Battery Short Circuit Protection
• Fast Response for Pulse-Charging
• Fast System-Load Transient Response
• Monitor Outputs
- Adapter Current (3% Accuracy)
- AC-Adapter Detection
• 11-Bit Battery Voltage Setting
• 6 Bit Charge Current/Adapter Current Setting
• 8A Maximum Battery Charger Current
• 11A Maximum Adapter Current
• +8V to +28V Adapter Voltage Range
• Pb-Free (RoHS Compliant)
Applications
• Notebook Computers
• Tablet PCs
• Portable Equipment with Rechargeable Batteries
28 27 26 25 24 23 22
NC 1
21 VDDP
ACIN 2
VREF 3
20 LGATE
19 PGND
ICOMP 4
NC 5
18 CSOP
17 CSON
VCOMP 6
NC 7
16 NC
15 VFB
8 9 10 11 12 13 14
Ordering Information
PART
NUMBER
(Notes 1, 2, 3)
PART
MARKING
TEMP
RANGE (°C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL88731HRZ ISL887 31HRZ -10 to +100 28 Ld 5x5 TQFN L28.5x5B
NOTES:
1. Add “-T*” suffix for tape and reel. Please refer to TB347 for details on reel
specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free
material sets, molding compounds/die attach materials, and 100%
matte tin plate plus anneal (e3 termination finish, which is RoHS
compliant and compatible with both SnPb and Pb-free soldering
operations). Intersil Pb-free products are MSL classified at Pb-free peak
reflow temperatures that meet or exceed the Pb-free requirements of
IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), please see device information page
for ISL88731. For more information on MSL please see techbrief TB363.
June 8, 2011
FN9258.3
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2006, 2009, 2011. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL88731
Electrical Specifications DCIN = CSSP = CSSN = 18V, CSOP = CSON = 12V, VDDP = 5V, BOOT-PHASE = 5.0V, GND = PGND = 0V,
CVDDP = 1µF, IVDDP = 0mA, TA = -10°C to +100°C. Boldface limits apply over the operating temperature range, -10°C to +100°C. (Continued)
PARAMETER
CONDITIONS
MIN MAX
(Note 6) TYP (Note 6) UNITS
Dead Time
Falling UGATE to rising LGATE or
falling LGATE to rising UGATE
35 50 80 ns
ERROR AMPLIFIERS
GMV Amplifier Transconductance
200 250 300 µA/V
GMI Amplifier Transconductance
40 50 60 µA/V
GMS Amplifier Transconductance
40 50 60 µA/V
GMI/GMS Saturation Current
15 21 25 µA
GMV Saturation Current
10 17 30 µA
ICOMP, VCOMP Clamp Voltage
LOGIC LEVELS
0.25V < VICOMP, VCOMP < 3.5V
200 300 400 mV
SDA/SCL Input Low Voltage
VDDSMB = 2.7V to 5.5V
0.8 V
SDA/SCL Input High Voltage
VDDSMB = 2.7V to 5.5V
2V
SDA/SCL Input Bias Current
VDDSMB = 2.7V to 5.5V
-1 1 µA
SDA, Output Sink Current
VSDA = 0.4V
7 15
mA
NOTE:
6. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization
and are not production tested.
SMBus Timing Specification VDDSMB = 2.7V to 5.5V
PARAMETERS
SYMBOL
SMBus Frequency
FSMB
Bus Free Time
TBUF
Start Condition Hold Time from SCL
THD:STA
Start Condition Setup Time from SCL
TSU:STA
Stop Condition Setup Time from SCL
TSU:STO
SDA Hold Time from SCL
THD:DAT
SDA Setup Time from SCL
TSU:DAT
SCL Low Timeout (Note 7)
TTIMEOUT
SCL Low Period
TLOW
SCL High Period
THIGH
Maximum Charging Period Without a SMBus Write to
ChargeVoltage or ChargeCurrent Register
NOTE:
7. If SCL is low for longer than the specified time, the charger is disabled.
CONDITIONS
MIN TYP MAX UNITS
10 100 kHz
4.7 µs
4 µs
4.7 µs
4 µs
300 ns
250 ns
22 25 30 ms
4.7 µs
4 µs
140 180 220
s
5 FN9258.3
June 8, 2011
5 Page 
ISL88731
Write To A Register
S
SLAVE
ADDR + W
A
REGISTER
ADDR
A
LO BYTE
DATA
A
HI BYTE
DATA
AP
Read From A Register
S
SLAVE
ADDR + W
A
REGISTER
ADDR
A
P
S
SLAVE
ADDR + R
A
LO BYTE
DATA
A
HI BYTE
DATA
NP
S START
A ACKNOWLEDGE
DRIVEN BY THE MASTER
P STOP
N NO ACKNOWLEDGE
DRIVEN BY ISL88731
FIGURE 18. SMBus/ISL88731 READ AND WRITE PROTOCOL
Byte Format
Every byte put on the SDA line must be eight bits long and must
be followed by an acknowledge bit. Data is transferred with the
most significant bit first (MSB) and the least significant bit last
(LSB).
ISL88731 and SMBus
The ISL88731 receives control inputs from the SMBus interface.
The serial interface complies with the SMBus protocols as
documented in the System Management Bus Specification V1.1,
which can be downloaded from www.smbus.org. The ISL88731
uses the SMBus Read-Word and Write-Word protocols (Figure 18)
to communicate with the smart battery. The ISL88731 is an
SMBus slave device and does not initiate communication on the
bus. It responds to the 7-bit address 0b0001001_ (0x12).
Read address = 0b00010011 and
Write address = 0b00010010.
In addition, the ISL88731 has two identification (ID) registers: a
16-bit device ID register and a 16-bit manufacturer ID register.
The data (SDA) and clock (SCL) pins have Schmitt-trigger inputs
that can accommodate slow edges. Choose pull-up resistors for
SDA and SCL to achieve rise times according to the SMBus
specifications. The ISL88731 is controlled by the data written to
the registers described in Table 1.
Battery Charger Registers
The ISL88731 supports five battery-charger registers that use
either Write-Word or Read-Word protocols, as summarized in
Table 1. ManufacturerID and DeviceID are “read only” registers
and can be used to identify the ISL88731. On the ISL88731,
ManufacturerID always returns 0x0049 (ASCII code for “I” for
Intersil) and DeviceID always returns 0x0001.
Enabling and Disabling Charging
After applying power to ISL88731, the internal registers contain
their POR values (see Table 1). The POR values for charge current
and charge voltage are 0x0000. These values disable charging.
To enable charging, the ChargeCurrent register must be written
with a number >0x007F and the ChargeVoltage register must be
written with a number >0x000F. Charging can be disabled by
writing 0x0000 to either of these registers.
REGISTER
ADDRESS
0x14
0x15
0x3F
0xFE
0xFF
TABLE 1. BATTERY CHARGER REGISTER SUMMARY
REGISTER NAME
ChargeCurrent
ChargeVoltage
InputCurrent
ManufacturerID
DeviceID
READ/WRITE
Read or Write
Read or Write
Read or Write
Read Only
Read Only
DESCRIPTION
6-bit Charge Current Setting
11-bit Charge Voltage Setting
6-bit Charge Current Setting
Manufacturer ID
Device ID
POR STATE
0x0000
0x0000
0x0080
0x0049
0x0001
11 FN9258.3
June 8, 2011
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet ISL88731.PDF ] | |
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