ISL88731CHRTZ-T

Manufacturer Part NumberISL88731CHRTZ-T
DescriptionIC BATT CHRGR SMBUS LVL2 28TQFN
ManufacturerIntersil
ISL88731CHRTZ-T datasheet
 


Specifications of ISL88731CHRTZ-T

FunctionCharge ManagementBattery TypeLithium-Ion (Li-Ion)
Voltage - Supply8 V ~ 26 VOperating Temperature-10°C ~ 100°C
Mounting TypeSurface MountPackage / Case28-WFQFN Exposed Pad
Lead Free Status / RoHS StatusLead free / RoHS Compliant  
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SMBus Level 2 Battery Charger
ISL88731C
The ISL88731C is a highly integrated Lithium-ion battery
charger controller, programmable over the SMBus system
management bus (SMBus). The ISL88731C 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
ISL88731C 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
ISL88731C provides 0.5% end-of-charge battery voltage
accuracy.
The ISL88731C 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 ISL88731C is available in a small 5mmx5mm 28 Ld Thin
(0.8mm) QFN package. An evaluation kit is available to reduce
design time. The ISL88731C is available in Pb-Free packages.
13.0
12.5
12.0
VCHG (V)
11.5
11.0
10.5
ICHG (A)
10.0
0
20
40
60
80
100
CHARGE TIME (MINUTES)
FIGURE 1. TYPICAL CHARGING VOLTAGE AND CURRENT
1
February 8, 2011
FN6978.2
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 +26V Adapter Voltage Range
• Pb-Free (RoHS Compliant)
Applications
• Notebook Computers
• Tablet PCs
• Portable Equipment with Rechargeable Batteries
Related Literature
• See
AN1404
Evaluation Boards Setup Procedure”
3.5
100
3.0
95
2.5
2.0
90
1.5
1.0
85
0.5
0.0
80
120
140
160
0.0
1.0
FIGURE 2. EFFICIENCY vs CHARGE CURRENT AND BATTERY
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
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.
for “ISL88731EVAL2Z and ISL88731CEVAL2Z
16.8V BATTERY
12.6V BATTERY
8.4V BATTERY
4.2V BATTERY
2.0
3.0
4.0
5.0
6.0
7.0
I
(A)
OUT
VOLTAGE
|
Copyright Intersil Americas Inc. 2010, 2011. All Rights Reserved
8.0

ISL88731CHRTZ-T Summary of contents

  • Page 1

    ... FIGURE 2. EFFICIENCY vs CHARGE CURRENT AND BATTERY CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 Intersil (and design trademark owned by Intersil Corporation or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners. for “ISL88731EVAL2Z and ISL88731CEVAL2Z 16 ...

  • Page 2

    DACV VDDSMB 6 DACS SDA SMBUS 6 DACI SCL EN CSSP - LEVEL SHIFTER GMS DACS CSSN + 20x ICOMP CSOP - LEVEL SHIFTER GMI CSON DACI + 20x VFB 500k 100k EN VCOMP AC ADAPTER AGND 2 ISL88731C ...

  • Page 3

    Pin Configuration Functional Pin Descriptions PIN NUMBER SYMBOL 2 ACIN AC Adapter Detection Input. Connect to a resistor divider from the AC adapter output. Range zero to 5.5V. 3 VREF Reference Voltage output. Range 3.168V to 3.232V internally ...

  • Page 4

    ... NC No Connect. Pins are not connected internally. Ordering Information PART NUMBER (Notes ISL88731CHRTZ 88731C HRTZ ISL88731CEVAL2Z Evaluation Board NOTES: 1. Add “-T*” suffix for tape and reel. Please refer to 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) ...

  • Page 5

    Table of Contents Absolute Maximum Ratings.............................................................. 6 Thermal Information .......................................................................... 6 Typical Operating Performance.................................................................9 Theory of Operation ......................................................................... 11 Introduction ................................................................................. 11 PWM Control................................................................................ 11 AC-Adapter Detection................................................................. 11 Current Measurement................................................................ 11 VDDP Regulator .......................................................................... 11 VDDSMB Supply .......................................................................... 11 Short ...

  • Page 6

    ... 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 Boldface limits apply over the operating temperature range, -10°C to +100°C. CONDITIONS ChargeVoltage = 0x41A0 ChargeVoltage = 0x3130 ...

  • Page 7

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

  • Page 8

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

  • Page 9

    Typical Operating Performance 5.15 5.10 5.05 5.00 4.95 4.90 4. VDDP LOAD CURRENT (mA) FIGURE 5. VDD LOAD REGULATION -10 - AC-ADAPTER CURRENT (A) FIGURE 7. ...

  • Page 10

    Typical Operating Performance UGATE PHASE FIGURE 11. SWITCHING WAVEFORMS AT DIODE EMULATION FIGURE 13. BATTERY REMOVAL ADAPTER CURRENT LOAD TRANSIENT RESPONSE FIGURE 15. 10 ISL88731C DCIN = 20V, 3S2P Li-Battery +25°C, unless otherwise noted A LGATE INDUCTOR CURRENT ...

  • Page 11

    Theory of Operation Introduction The ISL88731C includes all of the functions necessary to charge 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 ...

  • Page 12

    Over-Temperature Protection If the die temp exceeds +150°C, it stops charging. Once the die temp drops below +125°C, charging will start up again. Overvoltage Protection ISL88731C has an Overvoltage Protection circuit that limits the output voltage when the battery is ...

  • Page 13

    Acknowledge Each address and data transmission uses 9-clock pulses. The ninth pulse is the acknowledge bit (ACK). After the start condition, the master sends 7-slave address bits and a R/W bit during the next 8-clock pulses. During the ninth clock ...

  • Page 14

    ... Table 1. ManufacturerID and DeviceID are “read only” registers and can be used to identify the ISL88731C. On the ISL88731C, ManufacturerID always returns 0x0049 (ASCII code for “I” for Intersil) and DeviceID always returns 0x0001. Enabling and Disabling Charging After applying power to ISL88731C, the internal registers contain their POR values (see Table 1) ...

  • Page 15

    Setting Charge Current ISL88731C has a 16-bit ChargeCurrent register that sets the battery charging current. ISL88731C 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 16

    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 ISL88731C ...

  • Page 17

    Charger Timeout The ISL88731C includes 2 timers to insure the SMBus master is active and to prevent overcharging the battery. ISL88731C will terminate charging if the charger has not received a write to the ChargeVoltage or ChargeCurrent register within 175s ...

  • Page 18

    The RMS value of the output ripple current I is given by Equation MAX ( ) ⋅ ⋅ Cout --------------------------------- - – RMS ⋅ ⋅ ...

  • Page 19

    Ensure that the required total gate drive current for the selected MOSFETs should be less than 24mA. Thus, the total gate charge for the high-side and low-side MOSFETs is limited by Equation 11: I GATE ≤ Q -------------- GATE F ...

  • Page 20

    The output capacitor creates a pole at a very high frequency due to the small resistance in parallel with it. The frequency of this pole is calculated in Equation 16 ----------------------------------- - = POLE2 ⋅ ⋅ 2π C ...

  • Page 21

    The loop response equations, bode plots and the selection of C are the same as the charge current control loop with loop ICOMP gain reduced by the duty cycle and the ratio of R words and ...

  • Page 22

    COMPENSATOR MODULATOR 40 LOOP 20 0 -20 F ZERO1 F ZERO2 -40 -60 0.1k 1k 10k FREQUENCY (Hz) FIGURE 28. ASYMPTOTIC BODE PLOT OF THE VOLTAGE CONTROL LOOP GAIN Compensation Break Frequency Equations 1 F ---------------------------------------------------------------- - = ZERO1 ...

  • Page 23

    ... 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. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. ...

  • Page 24

    ... Initial release. Products Intersil Corporation is a leader in the design and manufacture of high-performance analog semiconductors. The Company's products address some of the industry's fastest growing markets, such as, flat panel displays, cell phones, handheld products, and notebooks. Intersil's product families address power management and analog signal processing functions complete list of Intersil product families ...

  • Page 25

    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 25 ISL88731C A ...