IC BATTERY CHRGR SMBUS 28-TQFN

ISL88731AHRZ-T

Manufacturer Part NumberISL88731AHRZ-T
DescriptionIC BATTERY CHRGR SMBUS 28-TQFN
ManufacturerIntersil
ISL88731AHRZ-T datasheet
 


Specifications of ISL88731AHRZ-T

FunctionCharge ManagementBattery TypeLithium-Ion (Li-Ion)
Voltage - Supply8 V ~ 26 VOperating Temperature-10°C ~ 100°C
Mounting TypeSurface MountPackage / Case28-TQFN
Lead Free Status / RoHS StatusLead free / RoHS Compliant  
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Data Sheet
SMBus Level 2 Battery Charger
The ISL88731A is a highly integrated Lithium-ion battery
charger controller, programmable over the SMBus system
management bus (SMBus). The ISL88731A 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
ISL88731A 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 ISL88731A provides 0.5% end-of-charge battery
voltage accuracy.
The ISL88731A 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 ISL88731A is available in a small 5mmx5mm 28 Ld thin
(0.8mm) QFN package. An evaluation kit is available to
reduce design time. The ISL88731A is available in Pb-Free
packages.
Pinout
ISL88731A
(28 LD TQFN)
TOP VIEW
28
27
26
25
24
23
NC
1
ACIN
2
VREF
3
ICOMP
4
NC
5
VCOMP
6
NC
7
8
9
10
11
12
13
1
February 8, 2011
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
Ordering Information
PART
NUMBER
22
(Notes 1, 2, 3)
21
VDDP
ISL88731AHRZ ISL887 31AHRZ -10 to +100 28 Ld 5x5
LGATE
20
NOTES:
PGND
19
1. Add “-T*” suffix for tape and reel. Please refer to
CSOP
18
on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special
17
CSON
Pb-free material sets, molding compounds/die attach materials,
NC
16
and 100% matte tin plate plus anneal (e3 termination finish,
which is RoHS compliant and compatible with both SnPb and
VFB
15
Pb-free soldering operations). Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or
14
exceed the Pb-free requirements of IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), please see device
information page for ISL88731A. For more information on MSL
please see techbrief TB363.
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. 2008, 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.
ISL88731A
FN6738.2
TEMP
PART
RANGE
PACKAGE
PKG.
MARKING
(°C)
(Pb-Free)
DWG. #
L28.5x5B
TQFN
TB347
for details

ISL88731AHRZ-T Summary of contents

  • Page 1

    ... Notebook Computers • Tablet PCs • Portable Equipment with Rechargeable Batteries Ordering Information PART NUMBER 22 (Notes VDDP ISL88731AHRZ ISL887 31AHRZ -10 to +100 28 Ld 5x5 LGATE 20 NOTES: PGND 19 1. Add “-T*” suffix for tape and reel. Please refer to CSOP 18 on reel specifications. ...

  • Page 2

    DACV VDDSMB 6 DACS SMBUS SDA 6 DACI SCL EN CSSP LEVEL SHIFTER DACS CSSN 20x ICOMP CSOP LEVEL SHIFTER CSON DACI 20x VFB 500k 100k EN VCOMP FIGURE 1. FUNCTIONAL BLOCK DIAGRAM AC ADAPTER AGND FIGURE 2. TYPICAL ...

  • Page 3

    ... QFN Package Junction Temperature Range .-55°C to +150°C Operating Temperature Range . . . . . . . . . . . . . . . .-10°C to +100°C Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C Pb-Free Reflow Profile .see link below http://www.intersil.com/pbfree/Pb-FreeReflow.asp = -10°C to +100°C. Boldface limits apply over the operating temperature A CONDITIONS ChargeVoltage = 0x3130 ChargeVoltage = 0x20D0 ...

  • Page 4

    Electrical Specifications DCIN = CSSP = CSSN = 18V, CSOP = CSON = 12V, VDDP = 5V, BOOT-PHASE = 5.0V, GND = PGND = 0V, CVDDP = 1µF, IVDDP = 0mA, T range, -10°C to +100°C. (Continued) PARAMETER Battery Quiescent ...

  • Page 5

    Electrical Specifications DCIN = CSSP = CSSN = 18V, CSOP = CSON = 12V, VDDP = 5V, BOOT-PHASE = 5.0V, GND = PGND = 0V, CVDDP = 1µF, IVDDP = 0mA, T range, -10°C to +100°C. (Continued) PARAMETER SWITCHING REGULATOR ...

  • Page 6

    Typical Operating Performance 5.15 5.10 5.05 5.00 4.95 4.90 4. VDDP LOAD CURRENT (mA) FIGURE 3. VDD LOAD REGULATION -10 - ADAPTER CURRENT (A) FIGURE 5. ...

  • Page 7

    Typical Operating Performance UGATE PHASE FIGURE 9. SWITCHING WAVEFORMS AT DIODE EMULATION FIGURE 11. BATTERY REMOVAL ADAPTER CURRENT FIGURE 13. LOAD TRANSIENT RESPONSE 7 ISL88731A DCIN = 20V, 3S2P Li-Battery +25°C, unless otherwise noted. (Continued) A LGATE INDUCTOR ...

  • Page 8

    Functional Pin Descriptions BOOT High-Side Power MOSFET Driver Power-Supply Connection. Connect a 0.1µF capacitor from BOOT to PHASE. UGATE High-Side Power MOSFET Driver Output. Connect to the high-side N-Channel MOSFET gate. LGATE Low-Side Power MOSFET Driver Output. Connect to low-side ...

  • Page 9

    Theory of Operation Introduction The ISL88731A includes all of the functions necessary to charge 1-to-4 cell Li-ion and Li-polymer batteries. A high efficiency synchronous buck converter is used to control the charging voltage up to 19.2V and charging current up ...

  • Page 10

    Short Circuit Protection and 0V Battery Charging Since the battery charger will regulate the charge current to the limit set by the ChargeCurrent register, it automatically has short circuit protection and is able to provide the charge current to wake ...

  • Page 11

    The System Management Bus The System Management Bus (SMBus 2-wire bus that supports bidirectional communications. The protocol is described briefly here. More detail is available from www.smbus.org. General SMBus Architecture VDDSMB SMBUS MASTER INPUT SCL CONTROL OUTPUT CPU ...

  • Page 12

    ... Table 1. ManufacturerID and DeviceID are “read only” registers and can be used to identify the ISL88731A. On the ISL88731A, ManufacturerID always returns 0x0049 (ASCII code for “I” for Intersil) and DeviceID always returns 0x0001. Enabling and Disabling Charging After applying power to ISL88731A, the internal registers contain their POR values (see Table 1) ...

  • Page 13

    Setting Charge Voltage Charge voltage is set by writing a valid 16-bit number to the ChargeVoltage register. This 16-bit number translates to a 65.535V full-scale voltage. The ISL88731A ignores the first 4 LSBs and uses the next 11 bits to ...

  • Page 14

    Setting Charge Current ISL88731A has a 16-bit ChargeCurrent register that sets the battery charging current. ISL88731A controls the charge current by controlling the CSOP-CSON voltage. The register’s LSB translates to 10µV at CSON-CSOP. With a 10mΩ charge current R resistor ...

  • Page 15

    Setting Input-Current Limit The total power from an AC-adapter is the sum of the power supplied to the system and the power into the charger and battery. When the input current exceeds the set input current limit, the ISL88731A decreases ...

  • Page 16

    Charger Timeout The ISL88731A includes 2 timers to insure the SMBus master is active and to prevent overcharging the battery. ISL88731A will terminate charging if the charger has not received a write to the ChargeVoltage or ChargeCurrent register within 175s ...

  • Page 17

    F 10% of the switching frequency. The highest F voltage control mode with the battery removed and may be calculated (approximately) from Equation 5: ⋅ ⋅ SENSE F ------------------------------------------ - = ...

  • Page 18

    Low switching loss requires low drain-to-gate charge Q Generally, the lower the drain-to-gate charge, the higher the ON-resistance. Therefore, there is a trade-off between the ON-resistance and drain-to-gate charge. Good MOSFET selection is based on the Figure of Merit (FOM), ...

  • Page 19

    VDD RAMP GEN V = VDD/11 RAMP - + PWM INPUT PWM GAIN= FET_RDSON L_DCR PWM INPUT FIGURE 20. SMALL SIGNAL AC MODEL In most cases the Battery resistance is very small (<200mΩ) resulting in a ...

  • Page 20

    F ZERO 20 0 -20 F POLE1 -40 -60 0.01 0.1 1 FREQUENCY (kHz) FIGURE 22. CHARGE CURRENT LOOP BODE PLOTS DCIN PHASE FET_RDSON CA2 + Σ 0.25 ...

  • Page 21

    C which give the loop very high DC gain, a very low VCOMP frequency pole and a zero at F ZERO1 information is added to the feedback to create a second zero F . The low pass filter R , ...

  • Page 22

    ... Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use ...

  • Page 23

    Package Outline Drawing L28.5x5B 28 LEAD THIN QUAD FLAT NO-LEAD PLASTIC PACKAGE Rev 1, 10/07 5.00 6 PIN 1 INDEX AREA (4X) 0.15 TOP VIEW ( 4. 65 TYP ) ( 3. 25) TYPICAL RECOMMENDED LAND PATTERN 23 ISL88731A A ...