AUR9807 BCDSEMI | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 24
Technical content
Features
- QFN Package
- Active Powe r Management (APM) for Simultaneously Powering the System and Charging the Battery
- Total Current Supported Up to 2 Amperes (System Loading Having Higher Priority on the Budget)
- Automatic Power Source Selection (AC Adapter or Battery)
- 40mΩ Power Path for the Battery to Supply the System Power Efficiently
- Junction Temperature Detection and Thermal Regulation During Charging Process
- External LED Indicating Charger and Power Good Status as Well as Fault Condition
- Thermal, Short -Circuit, a nd Reverse Current Protection
- Short-Circuit Protection in the Low Power Consumption Sleep Mode
- SYSOFF Function to Cut Off the Path Between the System and the Battery
- Built-in Over V oltage Protection up to 18V
Applications
- Battery-Powered Devices or Equipment
- Mobile Phones, Digital Cameras and MP3 Players
- Radios, Other Hand-Held Games and Instruments
- Solar Power System
Figure 1. Package Type of AUR9807
Figure 2. Pin Configuration of AUR9807 (Top View)
Single-cell Li-Ion Charger IC with System Power Management AUR9807 AUR9807 Document number: DS37580 Rev. 1 - 3 3 of 23 www.diodes.com October 2014 © Diodes Incorporated NOT RECOMMENDED FOR NEW DESIGN Pin Description Pin Number I/O Pin Name Function
1 O VREF Internal reference; VREF output capacitor not required, but
one with a value of 0.1μF is recommended.
2 O STA T1 Charge status flag 1 (open-drain)
3 O STA T2 Charge status flag 2 (open-drain)
4 I IN Chip input voltage
5 , 6 I/O BA T Battery connection; charging or discharging all through this pin
7 I ISET2
USB mode total current selection (High=450mA, Low= 90mA) and AC mode charge current selection (High=Full current, Low=half current)
8 I MODE Set AUR9807 in AC(High) or USB(Low) mode
9 I CE Chip enable (active high)
10 I/O ISET1 Set the maximum charging current
11 I SYSOFF Cut off the power path between the battery and the output pin
12 I/O TS Battery Temperature sensing
13 I APM Active Power Management set point ※ no need for
14 I/O TMR Timer program by external resistor connected to this pin. Tying TMR and VREF together to disable the safety timer 15 , 16 , 17 O OUT System output
18 O /PG Power-good status flag (open-drain)
19 , 20 I GND Chip Ground
Figure 3. Functional Block Diagram of AUR9807
Single-cell Li-Ion Charger IC with System Power Management AUR9807 AUR9807 Document number: DS37580 Rev. 1 - 3 5 of 23 www.diodes.com October 2014 © Diodes Incorporated NOT RECOMMENDED FOR NEW DESIGN G: Green
Ordering Information
Range Output Voltage Part Number Marking ID Packing Type QFN-4.5x3.5-20 -40 to 85C 4.4V, CV Mode AUR9807VFGD A9807VFG Tape & Reel 4.4V, Done AUR9807DFGD A9807DFG Tape & Reel 5V, CV Mode AUR9807VIGD A9807VIG Tape & Reel 5V, Done AUR9807DIGD A9807DIG Tape & Reel 6V, CV Mode AUR9807VSGD A9807VSG Tape & Reel 6V, Done AUR9807DSGD A9807DSG Tape & Reel BCD Semiconductor's Pb -free products, as designated with " G" in the part number, are RoHS compliant and green. D: QFN-4.5x3.5-20 Output Voltage VF: 4.4V, CV Mode DF: 4.4V, Done VI: 5V, CV Mode DI: 5V, Done VS: 6V, CV Mode DS: 6V, Done CV mode: After charge done, charger will stay in constant voltage mode until time out. Done: After charge done, charger will shut down until the battery voltage drops below the battery recharge threshold.
Single-cell Li-Ion Charger IC with System Power Management AUR9807 AUR9807 Document number: DS37580 Rev. 1 - 3 6 of 23 www.diodes.com October 2014 © Diodes Incorporated NOT RECOMMENDED FOR NEW DESIGN Absolute Maximum Ratings (Note 1) Parameter Symbol Value Unit Supply Input V oltage VIN -0.3 to 18 V Input V oltage VBAT, VCE, VAPM, V/PG, VMODE, VOUT, VISET1, VISET2, VSTAT1, VSTAT2, VTS -0.3 to 7 V VREF -0.3 to VOUT+0.3 V VTMR -0.3 to VOUT+0.3 V Input Current IIN 3.5 A Output Current IOUT 4 A IBA T -4 to 1.5 A Output Source Current (In Regulation at 3.3V VREF) IREF 30 mA Output Sink Current I/PG, ISTAT1, ISTA T2 15 mA Thermal Resistance (Junction to Ambient) JA 52 ° C/W Storage Temperature TSTG -65 to 150 °C Junction Temperature TJ -40 to 150 °C Lead Temperature (Soldering, 10 Seconds) 300 °C ESD (Human Body Model) VHBM 2000 V ESD (Machine Model) VMM 200 V Note 1: Stresses greater than those listed u nder “Absolute Maximum Ratings ” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions ” is not implied. Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability. Recommended Operating Conditions Parameter Symbol Min Max Unit Supply Voltage AUR9807DSGD, AUR9807VSGD VIN 4.35 6.3 V AUR9807DFGD,AUR9807VFGD, AUR9807DIGD, AUR9807VIGD 4.35 5.5 V Input Current IIN 2 A Operating Junction Temperature Range TOP -40 125 °C
Single-cell Li-Ion Charger IC with System Power Management AUR9807 AUR9807 Document number: DS37580 Rev. 1 - 3 7 of 23 www.diodes.com October 2014 © Diodes Incorporated NOT RECOMMENDED FOR NEW DESIGN
Electrical Characteristics
TA=25oC, VIN is within the recommended range, unless otherwise specified. Parameter Symbol Test Condition Min Typ Max Unit Active Supply Current IIN(SPLY) VIN>4.35V 1.1 2 mA Sleep Mode Current into BAT Pin IBA T(SLP) VIN<VBAT, 2.6V<VBA T<VBAT(REG) No load at OUT pin 2.5 5 μA Input Pin Standby Current IIN(STDBY) VIN<6V , Total current flow into IN pin with CE pin low; no load 200 μA BAT Pin Standby Current IBA T(STDBY) Total current flow into BAT pin with input source present and CE pin low 45 65 μA Charge Done Current, BA T IBA T(TERM) Current flows into BAT pin after the termination of the charging process 1 5 μA Q1,Q2 DROP-OUT VOLTAGE IN to OUT Dropout Voltage VDO(IN-OUT) MODE=High , IIN=1A 300 475 mV BAT to OUT Dropout Voltage VDO(BAT-OUT) VBA T> 4V , IBAT=1A 40 100 mV VOLTAGE REGULATION Regulation VOUT 9807VF 9807DF VOUT(REG) VIN>4.4V+VDO(IN-OUT) 4.4 4.5 V Regulation VOUT 9807VI 9807DI VOUT(REG) VIN>5V+VDO(IN-OUT) 4.9 5.1 V Regulation VOUT 9807VS 9807DS VOUT(REG) VIN>6V+VDO(IN-OUT) 6 6.3 V APM REGULATION APM Set Point VAPM-SET VAPM-SET<VOUT 2.6 3.8 V APM Current Source IAPM-SET Input present 95 100 105 μA APM Scale Factor SF VAPM-REG=VAPM-SET x SF 1.139 1.15 1.162 BATTERY SUPPLEMENT MODE Run Battery Supplement Mode VBSUP1 VBA T>2V VOUT< VBA T– 60mV V Escape Battery Supplement Mode VBSUP2 VBA T>2V VOUT> VBA T– 20mV V CHARGING-PRECHARGE Precharge to Fast-charge Transition Voltage VLOWV V oltage on BA T 2.9 3 3.1 V Precharge Current Range IPRECHG 10 150 mA
Single-cell Li-Ion Charger IC with System Power Management AUR9807 AUR9807 Document number: DS37580 Rev. 1 - 3 8 of 23 www.diodes.com October 2014 © Diodes Incorporated NOT RECOMMENDED FOR NEW DESIGN Electrical Characteristics (Continued) TA=25oC, VIN is within the recommended range, unless otherwise specified. Parameter Symbol Test Condition Min Typ Max Unit Precharge Set Voltage VPRECHG 225 250 275 mV De-glitch Time Between Fast Charge and Precharge Transition tDGLF tFALL=100ns, 10mV overdrive, VBA T decreasing below threshold 22.5 ms CHARGING-CURRENT REGULATION Fast Charge Current Range ICHG VBA T>VLOWV, Mode=High 100 1000 1500 mA BAT to OUT Pull-up RPBAT VBA T<1V 1000 Ω Battery Charge Current Set Voltage(1) VSET V oltage on ISET1 2.4 2.5 2.6 V Charge Current Set Factor KSET 100mA<ICHG<1.5A 375 425 450 10mA<ICHG<100mA 300 450 600 USB MODE INPUT CURRENT LIMIT USB Input Current Range IUSB ISET2=High 400 500 mA ISET2=Low 80 90 100 CHARGING VOLTAGE REGULATION Battery-charge-voltage VBA T(REG) 4.2 V Battery Charge Voltage Regulation Accuracy -1 1 % CHARGE TERMINATION DETECTION Charge Done Detection Current ITERM VBA T>VRCH, ITERM=(KSET x VTERM)/ RSET 10 150 mA Charge Done Set Voltage, Measured on ISET1 VTERM VBA T>VRCH, Mode=High 230 250 270 mV VBA T>VRCH, Mode=Low 95 100 130 TEMPERATURE SENSE COMPARATORS High Voltage, Low Temperature Threshold VLTF Temp fault at VTS>VLTF 2.5 V Low Voltage , High Temperature Threshold VHTF Temp fault at VTS<VHTF 0.5 V Current Source for Temperature Sense ITS 95 100 105 μA BATTERY RECHARGE THRESHOLD Recharge Threshold Voltage VRCH VBA T(RE -0.125 VBA T(RE -0.1 VBA T(RE -0.075 V (1) For half-charge rate, VSET is 1.25V .
Single-cell Li-Ion Charger IC with System Power Management AUR9807 AUR9807 Document number: DS37580 Rev. 1 - 3 9 of 23 www.diodes.com October 2014 © Diodes Incorporated NOT RECOMMENDED FOR NEW DESIGN Electrical Characteristics (Continued) TA=25oC, VIN is within the recommended range, unless otherwise specified. Parameter Symbol Test Condition Min Typ Max Unit STAT1, STAT2, AND /PG Low-level Output Saturation Voltage VOL IOL=5mA, requiri ng an external pull -up resistor > 1kΩ 0.25 V Input Leakage Current ILKG 1 5 μA ISET2, CE CE Pin Hold-off Time tCE-HLDOF F CE fall low only 4 6 ms Low-level Input Voltage VIL 0 1.1 V High-level Input Voltage VIH 1.5 CE Pin Low-level Input Current IIL1 -1 μA CE Pin High-level Input Current IIH1 1 ISET2 Pin Low-level Input Current IIL2 VISET2=0.4V -20 ISET2 Pin High-level Input Current IIH2 VISET2=VIN 40 MODE Mode Pin Low-level Input Voltage VIL Falling Hi→Low; 280kΩ±10% applied when low 0.975 1 1.025 V Mode Pin High-level Input Voltage VIH Input R MODE sets external hysteresis VIL+
0.01 VIL+
0.024 V Mode Pin Low-level Input Current IIL -1 μA TIMERS Timer Set Factor KTMR tCHG=KTMR x RTMR 0.313 0.36 0.414 s/Ω External Resistor Limits RTMR 30 100 kΩ Precharge Timer tPRECHG 0.115 x tCHG 0.125 x tCHG 0.135 x tCHG s Timer Fault Recovery Pull-up from OUT to BAT RFAULT 1 kΩ Time Out Extension Factor1 KEXT1 The actual charge current less than 50% of maximum fast charge current Time Out Extension Factor2 KEXT2 The actual charge current less than 25% of maximum fast charge current
Single-cell Li-Ion Charger IC with System Power Management AUR9807 AUR9807 Document number: DS37580 Rev. 1 - 3 10 of 23 www.diodes.com October 2014 © Diodes Incorporated NOT RECOMMENDED FOR NEW DESIGN Electrical Characteristics (Continued) TA=25oC, VIN is within the recommended range, unless otherwise specified. Parameter Symbol Test Condition Min Typ Max Unit CHARGER SLEEP THRESHOLDS Sleep-mode Entry Threshold VSLPENT VBA T +0.125 mV Sleep-mode Exit Threshold VSLPEXIT VBA T +0.195 DE-GLITCH TIME De-glitch Time for Charge Done Detection, Temperature Fault, Recharge and Sleep Mode Detection tDEG 18.75 ms START-UP CONTROL BOOT-UP Boot-up Time tBOOT-UP On the first application of input low 120 150 180 ms SWITCHING POWER SOURCE TIMING Switching Power Source from Input to Battery tSW-BA T When input applied. Measure from: [ /PG: Lo → Hi to IIN>5 mA ] 50 μs THERMAL SHUTDOWN REGULATION Temperature Trip TSHTDWN TJ (Q1 and Q3 only) 150 °C Thermal Hysteresis TJ (Q1 and Q3 only) 25 Temperature Regulation Limit TJ(REG) TJ (Q2) 110 130 UVLO Under-voltage Lockout VUVLO Decreasing VIN 2.45 2.5 2.65 V Input Power Detection Threshold VIN(DT) Input power detected when VIN>VBAT + VIN(DT) VBA T=3.6V VIN: 3.5V → 4V 55 80 130 mV Hysteresis 27 mV VREF OUTPUT Output Regulation Voltage VREF Active only if ADP or USB is present 3.3 V Regulation Accuracy -5 +5 % Output Current IREF 20 mA On Resistance RDS(ON) OUT to VREF 50 Ω Output Capacitance COUT 1 μF
TA=25oC, VIN is within the recommended range, unless otherwise specified. (2) For short current>ISHORT , short-protection may not work due to avalanche breakdown phenomenon. Figure 4. Output Voltage vs. Output Current Figure 5. Output Voltage vs. Charge Current
Single-cell Li-Ion Charger IC with System Power Management AUR9807 AUR9807 Document number: DS37580 Rev. 1 - 3 14 of 23 www.diodes.com October 2014 © Diodes Incorporated NOT RECOMMENDED FOR NEW DESIGN Power Flow AUR9807 IN OUT BAT VDC AC Adapter (or USB) OUTREF +- 40 mΩ AUR9807 IN OUT BAT SystemVDC AC Adapter (or USB) OUTREF +- 40 mΩ The AUR9807 selects the power source automatically. In the absence of the input source (AC adapter or USB), the battery is chosen to power the system. Under this circumstance, the AUR9807 consumes less than 5μ Ampere; the power path resistance from the battery to the system is only 40mΩ (3); all these guarantee a high efficiency and elongate the battery discharge time. With this st ringent sleep current budget (< 5μA), the AUR9807 is still able to detect an output short condition and cuts off the power path between the battery and the system under short condition. With the input power present, the MODE pin sets the AUR9807 in adapter mode or USB mode. In adapter mode, the AUR9807 does not limit the total current directly, current limiting phenomenon occurs through Adaptive Power Management in response to the output voltage drop. The resistor connected to ISET1 pin sets the maximum charging current. This maximum charging current can be halved by pulling down the ISET2 pin. In USB mode, the AUR9807 will limit the total current within 450mA (ISET2=High) or 90mA (ISET2=Low). The maximum charging current is still set by the resistor connected to ISET1 pin; however, because o f this current limiting feature, the actual charging current is usually less than 450mA (or 90mA). (3) Q2 design value is 40mΩ. Power Source Selection and Charge Current Setting MODE Pin Level AC Adapter Loading Power Source Charge Current Setting Low Yes USB ISET1, limitation depends on ISET2 setting No Battery N/A High Yes AC Adapter ISET1, half charging rate by setting ISET2 to low No Battery N/A
Single-cell Li-Ion Charger IC with System Power Management AUR9807 AUR9807 Document number: DS37580 Rev. 1 - 3 15 of 23 www.diodes.com October 2014 © Diodes Incorporated NOT RECOMMENDED FOR NEW DESIGN Charge Function Descriptions Charge Flow Time VBAT=3V VBAT = 4.2V Constant Current Phase Constant Voltage Phase Charge Current = 0.1 x ICHG Charge Done Timer Timeout VBAT=Recharge threshold Charge Done Current Voltage Charge current = ICHG Precharge Recharge Process Maximum Charging Current Setting Pre-charge and Charge Done Current Setting MODE=High ISET2=High 2.5V,R KVI maxSET, SET SETSET CHG ModeAC;10 II ;10 II maxCHG, TERM maxCHG, PRECHG MODE=High ISET2=Low 1.25V,R KVI maxSET, SET SETSET CHG ModeAC;20 II II maxCHG, TERM maxCHG, PRECHG MODE=Low ISET2=High/L ow 2.5V,R KVI maxSET, SET SETSET CHG ModeUSB;25 II II maxCHG, TERM maxCHG, PRECHG
Single-cell Li-Ion Charger IC with System Power Management AUR9807 AUR9807 Document number: DS37580 Rev. 1 - 3 16 of 23 www.diodes.com October 2014 © Diodes Incorporated NOT RECOMMENDED FOR NEW DESIGN Charge Function Descriptions (Continued) The maximum charging current, the pre -charge current and charge done current setting are given in the above table. The charging process begins with a pre-charge phase; when the battery voltage reaches the pre -charge threshold VLOWV, the charger enters the constant current mode. At this stage, the charger tries to charge the battery with the maximum charging current (a constant); however, the actual charging current may be lower due to Active Power Management activated by large system loading or insufficient input current capability. The therma l fold-back mechanism also reduces the actual charging current when the junction temperature is over 110° C. The battery voltage rises gradually with the constant current entering the battery. When the battery voltage reaches VBA T(REG), the charger enters the constant voltage mode. At this stage, the charger keeps the battery voltage at VBAT(REG) with a decreasing charging current. When the charging current drops below the charge done current setting, nominally the charging process is complete (this can be observed from the external indicator). Depending on different versions, after the charge done status indicated, the charger will stop providing charging current completely or stay in constant voltage mode till time out. When the battery voltage drops below the recharge threshold, a new charge cycle begins. Example: With a RSET=1kΩ, the maximum charging current is about 1A for ISET2=High and 0.5A for ISET2=Low. The pre-charge current IPRECHG is 100mA. The charge done current setting is 100mA for AC mode and 40mA for USB mode. Note the absolute values of pre-charge current and charge done current setting do not vary with ISET2. Power Source Selecting AUR9807 IN OUT BAT SystemVDC AC Adapter OUTREF +- 40 mΩ i. VIN<VBA T : VOUT=VBA T–VDO(BA T-OUT) ii. VBAT<VIN<VOUT(REG) : VOUT=VIN–VDO(IN-OUT) iii. VOUT(REG) +VDO(IN-OUT)<VIN<6V: VOUT=VOUT(REG) iv. 6V<VIN: VOUT =VBA T–VDO(BA T-OUT) The AUR9807 selects power source automatically depending on the voltage present at the input. When VIN is lower than V BA T, the battery is responsible to power the system. The output voltage V OUT is VBA T – VDO(BA T-OUT). When the input voltage V IN is high er than VBA T and lower than 6V , the input source is used to supply the system power; the output voltage depends on V IN. When V IN is lower than V OUT(REG), the output voltage V OUT is VIN–VDO(IN-OUT); when V IN is high enough, which means that V IN>(VOUT(REG)+ VDO(IN-OUT)), the output voltage is regulated at VOUT(REG). When the input voltage V IN is higher than 6V , the current path between IN and OUT is cut off to protect the chip; AUR9807 therefore selects the Battery as the power source; the output voltage V OUT is then VBA T–VDO(BA T-OUT).
Single-cell Li-Ion Charger IC with System Power Management AUR9807 AUR9807 Document number: DS37580 Rev. 1 - 3 17 of 23 www.diodes.com October 2014 © Diodes Incorporated NOT RECOMMENDED FOR NEW DESIGN NTC Li Battery 1µF BAT TS VLTF VHTF 100µA AUR9807LOGIC UNIT Charge Function Descriptions (Continued) Active Power Management (APM) AC MODE (MODE=HIGH) i. VAPM-REG<VOUT : Normal Mode; ICHG determined by RSET ii. VBAT<VOUT<VAPM-REG : APM mode ; ICHG= Isupply max–IOUT iii. VOUT<VBAT : BAT supply mode USB 500 MODE (MODE=LOW , ISET2=HIGH) i. VAPM-REG<VOUT: Normal Mode; ICHG determined by RSET ii. VBAT<VOUT<VAPM-REG : APM mode; ICHG = 450mA – IOUT iii. VOUT<VBAT: BAT supply mode USB 100 MODE (MODE=LOW , ISET2=LOW) i. VAPM-REG<VOUT : Normal Mode; ICHG determined by RSET ii. VBAT<VOUT<VAPM-REG : APM mode; ICHG= 90mA–IOUT iii. VOUT<VBAT : BAT supply mode The active power management feature adjusts the charging current to resist the output voltage drop due to heavy system loading or insufficient input driving capability. In the extreme situation, the charging current flow would be reversed (the battery helps to supply the system power). The active power management regulation voltage VAPM-REG is given by: VAPM-REG = IAPM-SET×RAPM × SF(4) When the output voltage is higher th an VAPM-REG, the input source is capable of providing the charging current (set by RSET) and output current (determined by system loading) simultaneously. When the output voltage goes down and reaches V APM-REG due to an increasing loading, AUR9807 starts t o reduce the charging current and tries to keep the output voltage at VAPM-REG. Because AUR9807 uses the remaining available current to charge the battery, the charging current can be estimated as Isupply max – IOUT. In AC mode, the Isupply max is determined by the driving capability of the AC adapter and AUR9807 itself (usually the limiting factor is the AUR9807, and I supply max is about 2A). The Isupply max is determined by the ISET2 setting in USB mode (Isupply max is about 450mA with ISET2 high, and Isupply max is about 90mA with ISET2 low). When the loading current keeps increasing and exceeds Isupply max, the AUR9807 can not prevent the output voltage dropping below V APM-REG even the charging current is reduced to zero. When the output voltage drops b elow the battery voltage, the battery helps to supply the loading current and keeps the output voltage roughly at VBAT. At this situation, we have: IOUT = Isupply max+IBAT (5) (4) RAPM<38kΩ: VAPM-REG=IAPM-SET×RAPM×SF RAPM>41kΩ: The V APM-REG is set to a predetermined fixed value (4.26V) (5) IBAT=(VBAT–VOUT) / (40mΩ Power Path Resistance) Battery Temperature Protection
Single-cell Li-Ion Charger IC with System Power Management AUR9807 AUR9807 Document number: DS37580 Rev. 1 - 3 18 of 23 www.diodes.com October 2014 © Diodes Incorporated NOT RECOMMENDED FOR NEW DESIGN Charge Function Descriptions (Continued) The AUR9807 interrupts the charging process when the battery temperature is out of normal range. It provides a 100μA sensing current to the negative -temperature coefficient resistor (on the battery side) through the TS pin. The battery protection is achieved by constantly monitoring the voltage at the TS pin. When this voltage is higher than V LTF (nominally 2.5V) or lower than VHTF (nominally 0.5V), an under -temperature or over-temperature condition is detected. For a n usual 103AT-type NTC resistor, the corresponding temperature range is between 0° C and 45° C. The normal battery temperature range can be modified by adjusting the NTC resistor or by adding extra resistor network between the TS pin and the negative-temperature coefficient resistor. The charging process would resume after the battery temperature goes back within the normal range. Charge Timeout Setting The charge timeout setting is programmed by the resistor RTMR connected between the TMR and ground pin. The timeout setting is given by: tCHG = KTMR × RTMR A suggested 36kΩ RTMR gives a 3.6 hrs timeout setting because the nominal value of KTMR is 0.36 sec/Ω. In the actual charging process, the charging duration is elongated if the charging current can not reach the maximum current setting (again this relates to system loading and environment temperature); therefore, it is possible that the cha rging process is still on progress while the 3.6 hrs timeout limit has been reached. To circumvent this problem, the actual charging current is monitored and the clock rate of the timer counter is halved if the charging current is less than 50% of the maximum fast charging current. This is equivalent to modify the timeout setting temporarily by the following equation: tCHG = KEXT1 x KTMR × RTMR, where KEXT1=2 If the actual charging current is less than one fourth the maximum fast charging current, the tim e out counter rate is reduced to 25%. The temporary timeout setting is given by: tCHG = KEXT2 x KTMR × RTMR, where KEXT2=4 Once the abnormal condition is removed (high temperature or heavy loading), the charging current resumes the maximum values (set by RSET), and the time out counter will operate in normal rate. Charge Status Indicator Status STA T1 STA T2 Pre-charge ON ON Constant current and constant voltage charge ON OFF Charge done OFF ON Fault condition (time out, sleep mode, or OTP) OFF OFF The open drain pins STAT1 and STAT2 provides the information about the charger status when the CE pin (chip enable) is set to high. The various charger status and the corresponding STAT1 and STAT2 levels are given in the above Table. Connect these pins to the host processor or LEDS to indicate the charger status. Short Circuit Protection AUR9807 provides short circuit protection for both the input and the battery. When VIN is larger than VBAT, AC adapter (or USB port) is chosen as the power source. If the output voltage is lower than 1V (VOUT(SC1)) for more than tDGL(SC), a short circuit condition is detected; the power path between the input and the output will be cut off. The charging process will be interrupted. A 500Ω resistor is used to pull up the output voltage; if the load at the output is removed, the output voltage can be pulled up and the short circuit condition is dissolved. Similarly, when the battery is chosen as the power source, an output voltage lower than the battery voltage by 200mV (V OUT(SC2)) longer than t DGL(SC) will trigger the short circuit protection mechanism (this corresponds to a 5A loading current). A 10mA current source is used to pull up the output and detect the removal of the short condition. The power consumption is less tha n 5μA under the battery supply mode; however, AUR9807 is still able to monitor the output voltage and detect a short circuit condition with this limiting current budget. SYSOFF Function The SYSOFF function is used to cut off the power path between the bat tery and the output. This means the
Single-cell Li-Ion Charger IC with System Power Management AUR9807 AUR9807 Document number: DS37580 Rev. 1 - 3 19 of 23 www.diodes.com October 2014 © Diodes Incorporated NOT RECOMMENDED FOR NEW DESIGN Charge Function Descriptions (Continued) charger function can be disabled by pulling up the SYSOFF pin; in this mode, the AUR9807 is almost a regulator to power the system. Because the power path is cut off, the output voltage will drop to zero when the input source is removed, the battery will not be used to power the system. The SYSOFF pin is pulled high internally; therefore, this pin should be pulled to ground for normal operation. Recharge Process and Timer Faul t Elimination If timeout occurs and the battery voltage is higher than the recharge threshold, the charger will stay in the charge done mode until the battery voltage drops below the recharge threshold. Once the battery voltage drops below the recharge thr eshold, a new charge cycle starts. If timeout occurs and the battery voltage is lower than the recharge threshold, the charger will indicate a fault condition and an internal resistor between output and battery will try to pull up the battery voltage. If the internal resistor is unable to pull up the battery voltage to the recharge threshold, the charger will stay in fault condition. Once the battery voltage is higher than the recharge threshold, the charger removes the pull -up resistor, leaves the fault condition and stay in the charge done mode temporarily. The charger then waits the battery voltage to drop below the recharge threshold and starts a new charge cycle.
layout. The following provides some guidelines.
- To obtain optimal performance, the decoupling
short trace runs to both signal and GND pins.
- All low-current GND connections should be kept
ground path and the power ground path.
- The high-current charge paths into IN and from the
voltage drops in these traces. Figure 13. The Evaluation Board Schematic
Figure 16. Typical Application of AUR9807
Single-cell Li-Ion Charger IC with System Power Management AUR9807 AUR9807 Document number: DS37580 Rev. 1 - 3 23 of 23 www.diodes.com October 2014 © Diodes Incorporated NOT RECOMMENDED FOR NEW DESIGN Mechanical Dimensions QFN-4.5× 3.5-20 Unit: mm(inch) N20 N1 N11 N10 N19 N12 BSC 4.500(0.177) 3.500(0.138) BSC 0.700(0.027) 0.800(0.031) Pin 1 Mark 1.950(0.077) 2.100(0.083) 0.300(0.012) 0.500(0.020) 2.950(0.116) 0.180(0.007) 0.300(0.012) 0.500(0.020) BSC 0.000(0.000) 0.050(0.002) 0.200(0.008) REF 1.500(0.059) BSC 3.100(0.122)
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Tel: +021-6485-1491, Fax: +86-021-5450-0008 MAIN SITE REGIONAL SALES OFFICE Shenzhen Office Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd., Shenzhen Office Unit A Room 1203,Skyworth Bldg., Gaoxin Ave.1.S., Nanshan District Shenzhen 518057, China Tel: +86-0755-8660-4900, Fax: +86-0755-8660-4958 Taiwan Office (Taipei) BCD Semiconductor (Taiwan) Company Limited Tel: +886-2-2656 2808 Fax: +886-2-2656-2806/26562950 Taiwan Office (Hsinchu) BCD Semiconductor (Taiwan) Company Limited 8F, No.176, Sec. 2, Gong-Dao 5th Road, East District HsinChu City 300, Taiwan, R.O.C Tel: +886-3-5160181, Fax: +886-3-5160181 - Headquarters BCD (Shanghai) Micro-electronics Limited No. 1600, Zi Xing Road, Shanghai ZiZhu Science-based Industrial Park, 200241, P. R.C. Tel: +86-021-2416-2266, Fax: +86-021-2416-2277 USA Office BCD Semiconductor Corp.
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