APM8601FB-7

APM8601 DUAL CHANNEL SINGLE CELL LINEAR LITHIUM BATTERY CHARGER WITH 28V OVP and PROGRAMMABLE CHARGE TIMER Description The APM8601 is a dual input channel linear Li-Ion charger for portable equipment that is optimized for small form-factor applications. The charge algorithm in the APM8601 covers all the charge requirements for a single Li-Ion battery cell. Included is pre-charging for deeply discharged cells, constant current / constant voltage fast charging and a top-off feature to bring the cell safely to a full-charge level. Pin Assignments N EW PRODUCT The battery is constantly monitored for overvoltage, charge time and cell temperature to ensure safe charging. A fault is triggered once the charge time exceeds a value that is programmable using a single capacitor and the temperature measurement is achieved through a thermistor positioned close to the battery cell. The APM8601 automatically selects the USB or DC input, depending on which is valid (DC has priority if both are valid). The charging current from the USB input is set to 100mA or 500mA based on the logic level of the USEL input. The APM8601 is packaged in U-DFN3030-14 package with a thermal pad. Figure 1. Pin Out Features • • • • • • • • • • • Linear Lithium Ion / Lithium Polymer charging IC Supply input safe up to 28V Fast charging with maximum current of 1A 100mA/500mA USB charge current selected with USEL Resistor-programmable charging current Resistor programmable end-of-charge Capacitor programmable charge timer Three charge indicator pins for a status display Thermal protection DFN3030-14: Available in “Green” Molding Compound (No Br, Sb) Lead Free Finish/ RoHS Compliant (Note 1) Applications • • • • • Handheld Consumer Devices Cell Phones, PDAs, MP3 Players Handheld Test Equipment Digital Still Cameras Multimedia players Note 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html. Typical Application Circuit Figure 2. Typical Application Circuit APM8601 Document number: DS35138 Rev. 1 - 2 1 of 14 www.diodes.com December 2010 © Diodes Incorporated APM8601 DUAL CHANNEL SINGLE CELL LINEAR LITHIUM BATTERY CHARGER WITH 28V OVP and PROGRAMMABLE CHARGE TIMER Pin Descriptions N EW PRODUCT Name BAT SETI THM GND CT USEL Pin # 1, 7 2 3 4 5 6 8 9 10 11 Connection to the Battery Charge Current programming Description The battery is charged via this pin and the BAT voltage is constantly monitored. Connect a bypass capacitor between BAT and GND (2.2µF). The maximum charge current is programmed using a resistor from SETI to GND. This also determines the prequal current charging level and top-off threshold. To monitor the battery temperature, connect a 10kΩ NTC thermistor. Place this Thermistor Input thermistor as close as possible to the battery. Connect THM to GND if temperature measurement is not required. Ground Ground connection. Connecting a capacitor from CT to GND will set the time-outs for prequal, top-off Charge Timing and fast-charge. Connecting CT direct to GND disables these timers. Logic input to program the charge current in USB charging mode. USB Charge Select IBAT = 90mA when USEL = low, and IBAT = 475mA when USEL = high. Enable (active-low) USB Input Power OK (active-low) Charge Status (active-low) DC Input Fault Flag (active-low) Exposed Pad The charger is enabled when this input is low. To start the charger connect EN to GND. Drive this input high to disable the charger. USB supply input. Connect a bypass capacitor (1µF) from USB to GND. When a valid input source is connected, this open-drain output is pulled low. Open-drain output that indicates the charging status. It is active only in the fastcharge state and goes high-impedance when the charger is either disabled or in prequal or top-off mode. DC supply input. The recommended input voltage is between 4.32V and 7V. This input is capable of withstanding up to 28V. Connect both DC pins together on the PCB. It is recommended to connect a bypass capacitor (1µF) from DC to GND. If the prequal or fast-charge timers expire and the charging threshold voltage is not reached, FLT (open-drain output) will go low. Remove the fault by cycling power or raise EN . For optimal thermal performance connect to copper on PCB (electrically this can be GND). EN USB POK CHG DC 12, 13 FLT 14 EP APM8601 Document number: DS35138 Rev. 1 - 2 2 of 14 www.diodes.com December 2010 © Diodes Incorporated APM8601 DUAL CHANNEL SINGLE CELL LINEAR LITHIUM BATTERY CHARGER WITH 28V OVP and PROGRAMMABLE CHARGE TIMER Functional Block Diagram N EW PRODUCT APM8601 Document number: DS35138 Rev. 1 - 2 3 of 14 www.diodes.com December 2010 © Diodes Incorporated APM8601 DUAL CHANNEL SINGLE CELL LINEAR LITHIUM BATTERY CHARGER WITH 28V OVP and PROGRAMMABLE CHARGE TIMER Absolute Maximum Ratings Symbol Parameter Rating -0.3 to 28V -0.3 to 6V 2 200 kV V Unit V V DC, USB to GND BAT, CT, SETI, USEL, THM, FLT , CHG , POK , EN to GND ESD Susceptibility (Note 2) HBM Human Body Model MM Machine Model N EW PRODUCT Note: 2. Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when handling and transporting this device. Thermal Resistance (Note 3) Symbol θJA Note: Parameter Junction to Ambient Rating 40 Unit °C/W 3. Test condition for DFN3030-10: Device mounted on FR-4 2-layer board, 2oz copper, with minimum recommended pad on top layer and 6 vias to bottom layer 1.0”x1.5” ground plane. Recommended Operating Conditions (Note 4) Symbol Parameter Ambient Temperature Range Input Supply Voltage ICHARGE Note: Rating -40 to +85 4.15 to 7.00 0.1 to 1.0 Unit °C V A Typical Charge Current 4. The device function is not guaranteed outside of the recommended operating conditions. APM8601 Document number: DS35138 Rev. 1 - 2 4 of 14 www.diodes.com December 2010 © Diodes Incorporated APM8601 DUAL CHANNEL SINGLE CELL LINEAR LITHIUM BATTERY CHARGER WITH 28V OVP and PROGRAMMABLE CHARGE TIMER Electrical Characteristics APM8601 is tested at VDC = VUSB = 5V, VBAT = 4V, V EN = 0V, RSETI = 2kΩ, CCT = 68nF, at an ambient temperature of +25°C unless otherwise noted. Symbol Parameter Test Conditions Min Typ. Max Unit VDC/VUSB Input Voltage Range 0 28 V VDC/VUSB Input Operating Range (Note 5) 4.15 7.00 V Input Undervoltage Lock Out Input rising, 500mV UVLO 3.85 4.0 4.15 V (Note 5) hysteresis (typ.) VBAT = 3.2V Input rising, 200mV OVLO Input Overvoltage Lock Out 7.2 7.5 7.8 V hysteresis (typ.) IDC/USB Input Supply Current IBAT = 0mA, RTHM = 10kΩ 750 1200 µA ISHTDWN Shutdown Current 275 435 µA EN = High, TA = 25ºC RDS_ON Input to BAT On-Resistance Input = 3.7V, VBAT = 3.6V 0.5 0.8 Ω Input falling, 200mV VDROPOUT Input to BAT dropout Voltage 5 55 150 mV hysteresis (typ.) VBAT_REG Battery Voltage Regulation IBAT = 0mA, TA = 25ºC 4.179 4.2 4.221 V Battery Fast-Charge Restart From BAT regulation BATRSTTH -230 -175 -110 mV Threshold voltage 950 1000 1140 RSETI = 1.5kΩ RSETI = 2.0kΩ 727 750 870 DC Charge Current mA IDC_CHG RSETI = 5.0kΩ 280 300 353 VUSB = 0V Prequal, RSETI = 2kΩ, 60 75 95 VBAT = 2.5V 450 475 500 VUSEL = 5V VUSEL = 0V 75 90 105 USB Charge Current IUSB_CHG mA VDC = 0V Prequal, RSETI = 2kΩ, 60 75 95 VBAT = 2.5V SS Soft-Start Time Ramp time to fast-charge 1.2 ms VBAT rising, 180mV VPREQ_TH BAT Prequel Threshold 2.9 3.0 3.1 V hysteresis (typ.) VDC = VUSB = 0V, VBAT = 0.001 5 µA ILEAK BAT Leakage Current 4.2V Guaranteed by charging RSETI Resistance Range for SETI 1.5 5.0 kΩ current Note: 5. Guaranteed by testing of undervoltage- and overvoltage-threshold. To completely charge a battery cell, the input voltage must be greater than 4.32V. N EW PRODUCT APM8601 Document number: DS35138 Rev. 1 - 2 5 of 14 www.diodes.com December 2010 © Diodes Incorporated APM8601 DUAL CHANNEL SINGLE CELL LINEAR LITHIUM BATTERY CHARGER WITH 28V OVP and PROGRAMMABLE CHARGE TIMER Electrical Characteristics (Continued) APM8601 is tested at VDC = VUSB = 5V, VBAT = 4V, V EN = 0V, RSETI = 2kΩ, CCT = 68nF, at an ambient temperature of +25°C unless otherwise noted. Symbol Parameter Test Conditions Min Typ. Max Unit EN , USEL Logic Input Thresholds Logic Input Leakage Current Rising Falling VEN = VUSEL = 0 to 5.5V, TA = 25ºC IPOK = ICHG = IFLT = 1mA 1.6 0.4 0.001 1 V µA N EW PRODUCT POK , CHG , FLT Logic Output Voltage, Low Logic Output Leakage Current, High 12 0.001 75 56.25 22.5 10 3.94 28.3 315 100 1 mV µA VPOK = VCHG = VFLT = 5.5V ITOPOFF RTHM_Pullup CHG / Top-Off Threshold Internal Pullup Resistance THM Resistance, Hot THM Resistance, Cold THM Resistance, Disabled VDC = VUSB = 0V TA = +25°C RSETI = 1.5kΩ IBAT falling, RSETI = 2.0kΩ battery is charged RSETI = 5.0kΩ RTHM falling, 420Ω hyst. (typ.) RTHM rising, 2.7kΩ hyst. (typ.) RTHM falling, 230Ω hyst. (typ.) CCT = 68nF From entering prequal to FLT going low, VBAT < 3V From entering fast-charge to FLT going low, 3V < VBAT < 4.2V From CHG going high to charger disabled Junction temperature beyond which the charge current is reduced, TJ rising Reduction of IBAT for increase in TJ (using VDC), RSETI = 1.5kΩ 37.5 75 mA kΩ kΩ kΩ Ω % min min min ºC 3.72 26.7 260 -20 4.13 29.7 370 +20 RTHM CTaccu TLPrequal TLCHG TLTop_off THFBtemp Charge Timer Accuracy Prequal Time Limit Charge Time Limit Top-Off Time Limit Thermal Foldback Threshold Temperature Thermal Foldback Gain 34.8 334 34.8 +100 THFBGain 5 %/ºC APM8601 Document number: DS35138 Rev. 1 - 2 6 of 14 www.diodes.com December 2010 © Diodes Incorporated APM8601 DUAL CHANNEL SINGLE CELL LINEAR LITHIUM BATTERY CHARGER WITH 28V OVP and PROGRAMMABLE CHARGE TIMER Functional Description APM8601 is a linear Li-Ion battery charger device for single-cell applications. It has dual power inputs (DC and USB) and the charge currents can be programmed with the RSETI resistor and/or the USEL pin. The device also incorporates several safety features, such as charge timers, battery temperature monitoring and internal thermal limiting. Functional State Diagram EN = HIGH VIN < VBAT VIN < 4.0V VIN > 7.5V DISABLE POK 1 IBAT FLT 1 CHG 0A 1 ANY STATE N EW PRODUCT OR OR OR RTHM < 315Ω OR (RTHM > 3.94kΩ AND RTHM < 28.3kΩ) THM POK CHG 0 FLT 1 0A (RTHM > 315Ω AND RTHM < 3.94kΩ) OR RTHM > 28.3kΩ VBAT < 2.82V Reset Timer RTHM < 315Ω OR (RTHM > 3.94kΩ AND RTHM < 28.3kΩ) THM POK CHG 0 FLT 1 0A POK 0 IBAT (USB) IBAT (DC) (RTHM > 315Ω AND RTHM < 3.94kΩ) OR RTHM > 28.3kΩ IBAT > 172.5 / RSETI Reset Timer POK 0 IBAT EN = LOW AND VIN > VBAT AND VIN > 4.0V AND VIN < 7.5V PREQUAL FLT 1 CHG 150 / RSETI 1 VBAT < 3V AND Time out FAULT VBAT > 3V Reset Timer POK CHG 0 1 FLT IBAT 0 0A 1 IBAT Timer Hold CHARGE FLT 1 CHG 0 USEL Setting 1500 / RSETI IBAT > 112.5 / RSETI AND Time out 0 IBAT Timer Hold IBAT < 112.5 / RSETI Reset Timer VBAT < 4.05V Reset Timer CHG 1 TOP-OFF POK 0 FLT 1 Time out DONE POK 0 IBAT FLT 1 CHG 0A 1 APM8601 Document number: DS35138 Rev. 1 - 2 7 of 14 www.diodes.com December 2010 © Diodes Incorporated APM8601 DUAL CHANNEL SINGLE CELL LINEAR LITHIUM BATTERY CHARGER WITH 28V OVP and PROGRAMMABLE CHARGE TIMER Functional Description (continued) INPUTS DC Pins 12 and 13 are the DC input. This input will allow charging from input voltages between 4.15V and 7V, and can withstand up to 28V without device damage although charging is disabled above 7.5V (typ.). N EW PRODUCT USB Pin 9 is the USB power input. This input will charge with input voltages from 4.15V to 7V. The charging current drawn from USB is selected using the USEL pin, either at 95mA (1 USB power allocation unit) or 475mA (5 USB power allocation units, High Power). Note that RSETI has no effect on USB charging currents in the Charge state, but RSETI does affect the Prequal current when charging from USB. This pin will also withstand up to 28V, but charging is disabled above 7.5V (typ.). If both DC and USB are connected and valid, power will be drawn from DC with charge current set by RSETI. USB and USEL will be ignored. GND System ground connection. EN Pin 8 is the enable pin of the device. When pulled low the device will operate normally. When high, the device will remain in the disabled state. For auto-starting, connect pin 8 directly to GND. SETI Pin 2 allows the charge currents to be programmed. RSETI = 1500 ICHARGE The charge current setting also changes the currents in prequal and top-off modes (being 10% and 7.5% of ICHARGE respectively): IPREQUAL = 150 RSETI ITOPOFF = 112.5 RSETI This pin can also be used to monitor the battery charging current: ICHARGE = VSETI× 1000 RSETI THM The thermistor connection is on pin 3. This allows the battery temperature to be monitored using a 10k NTC thermistor, which should be placed as close as possible to the battery cell. If no thermistor is used then this input should be connected directly to ground. The charger will operate when there is less than 315Ω on this input (i.e., no thermistor connected); will be disabled when there is between 315Ω and 3.94kΩ; enabled when between 3.94kΩ and 28.3kΩ; and disabled above 28.3kΩ. Enabled 0 315Ω 3.94k RTHM 28.3k Thermistor Beta 3000 3250 3500 3750 Resistance  in kΩ at 0°C 25°C 50°C 25.1 10 4.6 27.1 10 4.3 29.3 10 4 31.7 10 3.8 Typical  in °C Hot trip Cold Trip 55.1 ‐3.2 52.6 ‐1.3 50.5 0.5 48.6 2.0 Disabled APM8601 Document number: DS35138 Rev. 1 - 2 8 of 14 www.diodes.com Disabled Enabled December 2010 © Diodes Incorporated APM8601 DUAL CHANNEL SINGLE CELL LINEAR LITHIUM BATTERY CHARGER WITH 28V OVP and PROGRAMMABLE CHARGE TIMER Functional Description (continued) USEL Pin 6 allows the selection of the USB charging current. When low, IBAT is limited to 95mA (one USB power allocation unit) and when High IBAT is limited to 475mA (5 USB power allocation units, High Power), when drawing power from the USB input. This pin does not affect the device operation when power is being drawn from DC. CT The Charge Timer input on pin 5 allows selection of how long the system timers for Prequal, Charge and Top-off states last. They are set by selecting the value of capacitor, CCT: ⎛ CCT ⎞ TCHARGE = 334 min× ⎜ ⎟ ⎝ 68nF ⎠ N EW PRODUCT ⎛ CCT ⎞ TPREQUAL = TTOPOFF = 34.8 min× ⎜ ⎟ ⎝ 68nF ⎠ The charge timer will hold its current value if the charging was stopped via the thermistor and continue when the battery is in a valid temperature range for charging. OUTPUTS BAT Pins 1 and 7 are the current-controlled charging outputs for the battery cell. They should be connected together and to the positive terminal of the battery. The chip monitors the voltage on these pins. There should be a 2.2µF capacitor connected from BAT to GND. POK The POK flag on pin 10 is pulled low when a valid power input is available on either DC or USB inputs. It will go high when no valid power is available and the device will enter the Disable state. The CHG flag at pin 11 is pulled low when the device is in the Charge state. It will be high in Prequal and Top-off states. If the thermistor trips the circuit into the THM state (from Prequal or Charge states), CHG will hold its previous value. CHG FLT The FLT flag on pin 14 indicates a battery fault, as determined by a time-out in either the Prequal or Charge states. If the battery voltage does not reach 3V after the prequal timer (default 34.8mins), or does not reduce charging current to 7.5% after the charge timer (default 334mins), this indicates that the battery has failed or is failing and this will trigger the FLT flag. This flag will not automatically reset, and can only be cleared by cycling the power input or the EN pin. APM8601 Document number: DS35138 Rev. 1 - 2 9 of 14 www.diodes.com December 2010 © Diodes Incorporated APM8601 DUAL CHANNEL SINGLE CELL LINEAR LITHIUM BATTERY CHARGER WITH 28V OVP and PROGRAMMABLE CHARGE TIMER Functional Description (continued) EN CHG 4.2V N EW PRODUCT 3V VBAT 0V ICHARGE 1500/RSETI PREQUAL DISABLE TOP-OFF CHARGE IBAT IPREQUAL 150/RSETI 0A ITOPOFF 112.5/RSETI t CHARGING PROCESS DESCRIPTION The charging process is as follows, working through the state diagram. The device will begin in the Disable state as the input power supply ramps from 0V. Once the input power supply has got into the valid range (4.15V – 7V), and the device is enabled then it will enter the Prequal state. This state allows for slow charging of a severely discharged battery. If the battery is already partially charged then the condition to move into the Charge state is met. If it is not then the slow charge will increase the battery voltage until it can enter the Charge state, or if the voltage does not rise sufficiently before the charge timer runs out (set using the capacitor on the CT pin) then the device will go into the Fault state, indicating that the battery cell may be damaged or has failed and is not taking charge. In the Prequal state the battery temperature can be monitored with a 10k NTC thermistor connected to the THM pin, and if the battery temperature goes out of range (above ~50°C or below ~0°C, depending on thermistor choice) then charging will be suspended with the device going into the THM state. Once the battery has charged to a level of 3V, the device enters the Charge state, allowing faster charging of the battery in its normal voltage range, with 10 times the current used in the Prequal state. For information on setting the charge currents, see the functional description of the SETI pin. Again, the battery temperature is monitored and charging will be suspended if the temperature goes out of range. The Charge state will last until the current drawn by the battery drops to 7.5% of the full charge current. The device will then enter the Top-Off state, maintaining battery voltage and providing top-off charging current for the time defined by the CT value. Once that timer completes, the device will enter the Done state, with zero battery current. If the battery voltage falls below 4.05V then the device will automatically return to the Charge state. APM8601 Document number: DS35138 Rev. 1 - 2 10 of 14 www.diodes.com DONE December 2010 © Diodes Incorporated APM8601 DUAL CHANNEL SINGLE CELL LINEAR LITHIUM BATTERY CHARGER WITH 28V OVP and PROGRAMMABLE CHARGE TIMER Ordering Information APM8601 FB - 7 Package FB :U-DFN3030-14 Device Package Code Packaging (Note 6) Packing 7 : Tape & Reel 7” Tape and Reel Quantity Part Number Suffix 3000/Tape & Reel -7 N EW PRODUCT APM8601FB-7 Note: FB U-DFN3030-14 6. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf. Marking Information ( Top View ) XX Y WX XX : P4 : APM8601 Y : Year : 0~9 W : Week : A~Z : 1~26 week; a~z : 27~52 week; z : represents 52 and 53 X : A~Z : Internal Code Identification Code Part Number Package APM8601FB-7 U-DFN3030-14 P4 APM8601 Document number: DS35138 Rev. 1 - 2 11 of 14 www.diodes.com December 2010 © Diodes Incorporated APM8601 DUAL CHANNEL SINGLE CELL LINEAR LITHIUM BATTERY CHARGER WITH 28V OVP and PROGRAMMABLE CHARGE TIMER Package Outline Dimensions (All Dimensions in mm) U-DFN3030-14 TOP MARK 0.10 C 0.08 C 0.57/0.63 0/0.05 0.15 Seating Plane 0.25 A Side View 2.95/3.05 2.2/2.4 C 14x-0.50 N EW PRODUCT 2X- Top View 14x-0.25 C L 0.40Typ B A (Pin #1 ID) 2.95/3.05 C0 1.6/1.8 .3 1.80 C L 0.30/0.40 C L (Pin #1 ID) 2X- 0.25 B 0.40Typ. C L 0.15/0.25 0.10 CAB 2.40 Land Pattern Recommendation (Unit:mm) Bottom View APM8601 Document number: DS35138 Rev. 1 - 2 12 of 14 www.diodes.com December 2010 © Diodes Incorporated 2.65 APM8601 DUAL CHANNEL SINGLE CELL LINEAR LITHIUM BATTERY CHARGER WITH 28V OVP and PROGRAMMABLE CHARGE TIMER Taping Orientation (Note 7) N EW PRODUCT Note: 7. The taping orientation of the other package type can be found on our website at http://www.diodes.com/datasheets/ap02007.pdf APM8601 Document number: DS35138 Rev. 1 - 2 13 of 14 www.diodes.com December 2010 © Diodes Incorporated APM8601 DUAL CHANNEL SINGLE CELL LINEAR LITHIUM BATTERY CHARGER WITH 28V OVP and PROGRAMMABLE CHARGE TIMER IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). 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Life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. N EW PRODUCT Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright © 2010, Diodes Incorporated www.diodes.com APM8601 Document number: DS35138 Rev. 1 - 2 14 of 14 www.diodes.com December 2010 © Diodes Incorporated