Single-/Dual-Input 1-Cell Li+ Chargers with OVP Protection and Programmable Charge Timer

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1 ; Rev 3; 12/8 EVALUATION KIT AVAILABLE Single-/Dual-Input 1-Cell Li+ Chargers with General Description The single-/dual-input linear battery chargers safely charge single-cell Li+ batteries. The charging rate is optimized to accommodate the thermal characteristics of a given application. There is no need to reduce the maximum charge current or worst-case charger power dissipation. Charging is optimized for Li+ cells using a control algorithm that includes low-battery precharging, voltage and currentlimited fast-charging, and top-off charging, while continuously monitoring the battery for overvoltage, over/undertemperature, and charging time. The charger timeout protection is programmable. The charger status is indicated by three open-drain outputs. The MAX861 automatically selects between either a USB or AC adapter input source. The AC adapter charge current is programmable, while USB charge current is set not to exceed either 1mA or 5mA, depending on the USEL input. The MAX8 is a single-input charger with no USB source input. The are available in a 3mm x 3mm power-enhanced TDFN package. Cell Phones Digital Cameras PDAs TOP VIEW Applications Portable Media Players MP3 Players Wireless Appliances Pin Configurations Features Single- (MAX8) or Dual- (MAX861) Input Li+ Charger Up to 1A Programmable Fast-Charge 1mA/5mA USB Select Input (MAX861) ±5% Fast-Charge Current-Limit Accuracy 14V Input Overvoltage Protection Programmable On-Chip Charge Timers Battery Thermistor Input Charger-Status Outputs Thermally Optimized Charge Rate 14-Pin, 3mm x 3mm TDFN Package PART MAX8ETD+ MAX861ETD+ TEMP RANGE -4 C to +85 C -4 C to +85 C Ordering Information PIN-PACKAGE 14 TDFN-EP* 3mm x 3mm (T1433-2) 14 TDFN-EP* 3mm x 3mm (T1433-2) *EP = Exposed pad. +Denotes a lead(pb)-free/rohs-compliant package. V LOGIC TOP MARK ABB AAC Typical Operating Circuit BAT N.C. N.C MAX FLT POK N.C. EN AC ADAPTER USB PORT 1mA ON 5mA OFF FLT POK USB BAT MAX861 USEL EN Li+ CHARGE STATUS TDFN Pin Configurations continued at end of data sheet. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at , or visit Maxim s website at

2 ABSOLUTE MAXIMUM RATINGS, USB to...-.3v to +16V BAT,,, EN, FLT,, POK,, USEL to...-.3v to +6.V Continuous Power Dissipation (T A = +7 C) 14-Pin TDFN 3mm x 3mm Multilayer PCB (derate 24.4mW/ C above +7 C) mW Operating Temperature Range...-4 C to +85 C Junction Temperature C Storage Temperature Range C to +15 C Lead Temperature (soldering, 1s)...+3 C Stresses beyond those listed under 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 in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELERICAL CHARAERISTICS (V = V USB = 5V, V BAT = 4V, V EN = V, R = 2kΩ, C =.68µF, T A = -4 C to +85 C, unless otherwise noted. Typical values are at T A = +25 C. Note 1) PARAMETER CONDITIONS MIN TYP MAX UNITS OR USB (Note 2) Input Voltage Range 14 V Input Operating Range (Note 3) V Input Undervoltage Threshold Input rising, 5mV hysteresis (typ) V Input Overvoltage Threshold Input rising, mv hysteresis (typ) V Input Overvoltage Delay From overvoltage event to charger disabled.25 s Input Supply Current I BAT = ma, R = 1kΩ 75 1 µa Shutdown Input Current V EN = 5V, T A = +25 C µa Input to BAT On-Resistance Input = 3.7V, V BAT = 3.6V.5.8 Ω Input to BAT Dropout Voltage Input falling, mv hysteresis (typ) mv BAT BAT Regulation Voltage BAT Restart Fast-Charge Threshold Charging Current USB Charging Current I BAT = ma T A = +25 C T A = -4 C to +85 C From BAT regulation voltage mv V USB = V V = V R = 1.5kΩ R = 2kΩ R = 5kΩ Prequal, R = 2kΩ, V BAT = 2.5V V USEL = 5V V USEL = V Prequal, R = 2kΩ, V BAT = 2.5V Soft-Start Time Ramp time to fast-charge current 1.2 ms BAT Prequal Threshold V BAT rising, 18mV hysteresis (typ) V BAT Leakage Current V = V USB = V, V BAT = 4.2V.1 5 µa R Resistance Range Guaranteed by charging current kω V ma ma 2

3 ELERICAL CHARAERISTICS (continued) (V = V USB = 5V, V BAT = 4V, V EN = V, R = 2kΩ, C =.68µF, T A = -4 C to +85 C, unless otherwise noted. Typical values are at T A = +25 C. Note 1) EN, USEL PARAMETER CONDITIONS MIN TYP MAX UNITS Logic Input Thresholds Logic Input Leakage Current V EN = V USEL = to 5.5V POK,, FLT Rising 1.6 Falling.4 T A = +25 C.1 1 T A = +85 C.1 Logic Output Voltage, Low I POK, = I = I FLT = 1mA 12 1 mv Logic Output Leakage Current, High /Top-Off Threshold V POK = V = V FLT = 5.5V, T A = +25 C.1 1 V = V USB = V T A = +85 C.1 I BAT falling, battery is charged R = 1.5kΩ 75 R = 2kΩ R = 5kΩ 22.5 Pullup Resistance 1 kω Resistance, Hot R falling, 42Ω hysteresis (typ) kω Resistance, Cold R rising, 2.7kΩ hysteresis (typ) kω Resistance, Disabled R falling, 23Ω hysteresis (typ) Ω Timer Accuracy C =.68µF % Prequal Time Limit From entering prequal to FLT low, V BAT < 3V 34.8 min Charge Time Limit From entering fast-charge to FLT low, 3V < V BAT < 4.2V 334 min Top-Off Time Limit From high to charger disabled 34.8 min THERMAL LOOP Thermal-Limit Temperature Juncti on tem p er atur e w hen the char g e cur r ent i s r ed uced, T J r i si ng V µa µa ma +1 C Thermal-Limit Gain Reduction of I BAT for increase of T J, from V, R = 1.5kΩ 5 %/ C Note 1: Limits are 1% production tested at T A = +25 C. Limits over the operating temperature range are guaranteed by design and characterization. Note 2: Input refers to either or USB. Note 3: Guaranteed by undervoltage- and overvoltage-threshold testing. For complete charging, the input voltage must be greater than 4.32V. 3

4 Typical Operating Characteristics (V = 5V, R = 2kΩ, V BAT = 3.6V, MAX861 evaluation kit with thermal resistance of 5 C/W. T A = +25 C, unless otherwise noted.) SUPPLY CURRENT (μa) SUPPLY CURRENT vs. INPUT VOLTAGE INPUT VOLTAGE (V) V EN = V MAX8/1 toc1 SUPPLY CURRENT (μa) DISABLED SUPPLY CURRENT vs. INPUT VOLTAGE V EN = 5V INPUT VOLTAGE (V) MAX8/1 toc2 CHARGE CURRENT (ma) 1 CHARGE CURRENT vs. BATTERY VOLTAGE R = 1.5kΩ R = 2kΩ R = 3kΩ DASHED DATA TAKEN WITH PULSE TESTING TO AVOID THERMAL LIMIT V BAT (V) MAX8/1 toc3 CHARGE CURRENT (ma) 1 CHARGE CURRENT vs. VOLTAGE R = 1.5kΩ R = 2kΩ R = 3kΩ DASHED DATA TAKEN WITH PULSE TESTING TO AVOID THERMAL LIMIT V (V) MAX8/1 toc4 CHARGE CURRENT (ma) CHARGE CURRENT vs. USB VOLTAGE DASHED DATA TAKEN WITH PULSE TESTING TO AVOID THERMAL LIMIT V USB (V) V USEL = 5V V USEL = V MAX8/1 toc5 CHARGE CURRENT (ma) CHARGE CURRENT vs. INPUT VOLTAGE HEADROOM (V IN - V BAT ) (V) MAX8/1 toc6 BATTERY REGULATION VOLTAGE (V) BATTERY REGULATION VOLTAGE vs. AMBIENT TEMPERATURE T A ( C) MAX8/1 toc7 CHARGE CURRENT (ma) CHARGE CURRENT vs. AMBIENT TEMPERATURE (75mA CHARGE) V BAT = 3.6V V BAT = 4V T A ( C) MAX8/1 toc8 4

5 Typical Operating Characteristics (continued) (V = 5V, R = 2kΩ, V BAT = 3.6V, MAX861 evaluation kit with thermal resistance of 5 C/W. T A = +25 C, unless otherwise noted.) CHARGE CURRENT (ma) CHARGE CURRENT vs. AMBIENT TEMPERATURE (1A CHARGE) V BAT = 3.6V V BAT = 4V R = 1.5kΩ T A ( C) MAX8/1 toc9 FAST-CHARGE TIME (MIN) FAST-CHARGE TIME vs. C C (μf) MAX8/1 toc1 Pin Description PIN MAX8 MAX861 NAME 1 1, 7 BAT FUNION Battery Connection. The IC delivers charging current and monitors battery voltage using BAT. Bypass BAT to with a 2.2µF or larger ceramic capacitor. Connect both BAT inputs together externally (MAX861). BAT is high impedance when the IC is disabled. Charge-Current Programming Input. Connect a resistor from to to set the maximum charging current when using the input, the prequal current from either input, and the turn-off threshold. Thermistor Input. Connect a 1kΩ NTC thermistor, in close proximity to the battery, from to ground to monitor the battery temperature. Connect to to disable the thermistor functionality. The IC suspends charging when R is outside the hot and cold limits. 4 4 Ground 5 5 Timing Capacitor Input. Connect a capacitor from to to set the precharge timeout, top-off time, and fast-charge timeout. Connect to to disable the timers. 6, 7, 9 N.C. No Connection. Make no external circuit connection. 8 8 EN 1 1 POK Active-Low Enable Input. Drive low or connect EN to to enable the charger. Drive EN high to disable the charger. Power-OK Monitor. POK is an open-drain output that pulls low when a valid charging source is detected at either or USB (MAX861). POK is high impedance when EN is high. Charging-Status Output. goes low when the battery is above 3V and being charged with a current greater than 7.5% of the current programmed with R. is high impedance when the charger is in prequal, top-off, or disabled. 5

6 MAX8 PIN MAX861 NAME 12, 13 12, FLT FUNION Input Supply. Connect to a 4.5V to 7V charging source. Bypass to with a 1µF or larger capacitor. takes priority over USB when both are present (MAX861). Both inputs should be connected together externally. Fault Status Output. FLT goes low when either the prequal timer or the fast-charge timers expire and the battery voltage is not above the required threshold. Clear the fault by raising EN or removing input power. 9 USB USB Input Source. Connect to a USB port. Bypass USB to with a 1µF or larger capacitor. 6 USEL Pin Description (continued) USB Charge-Select Input. Logic input that determines the maximum charge current drawn from the USB input. I BAT = 95mA when USEL = low, and I BAT = 475mA when USEL = high. EP Exposed Pad. Connect to the plane for optimum thermal dissipation. OFF POK = HIGH, = HIGH, FLT = HIGH I BAT = A V IN < 4.1V OR V IN < 7.5V OR V IN < V BAT OR EN HIGH ANY STATE OUT OF RANGE POK = PREVIOUS STATE = PREVIOUS STATE I BAT = A PREQUAL TIMER HELD OUT OF RANGE POK = PREVIOUS STATE = PREVIOUS STATE I BAT = A FAST-CHARGE TIMER HELD R > 3.97kΩ AND R < 28.7kΩ R < 3.97kΩ OR R > 28.7kΩ R > 3.97kΩ AND R < 28.7kΩ R < 3.97kΩ OR R > 28.7kΩ V BAT < 2.82V SET TIMER = s EN LOW AND POWER-GOOD SET TIMER = s PREQUAL POK = LOW, = HIGH I BAT = 15 / R V BAT > 3V SET TIMER = s FAST-CHARGE POK = LOW, = LOW I BAT() = 15 / R ISET I BAT(USB) = 1mA / 5mA I BAT < 172.5/R AND VOLTAGE MODE SET TIMER = s I BAT < / R AND VOLTAGE MODE SET TIMER = s V BAT < 3V AND PREQUAL TIMEOUT I BAT > / R AND FAST-CHARGE TIMEOUT FAULT = HIGH FLT = LOW TOP-OFF POK = LOW, = HIGH V BAT < 4.5V SET TIMER = s TOP-OFF TIMEOUT DONE POK = LOW, = HIGH I BAT = A Figure 1. Charger State Diagram 6

7 Detailed Description Charging The are designed to charge a single-cell Li+ battery from a source voltage between 4.15V and 7V. The precharge current, charge current, and top-off threshold are programmable with R. USB Charging (MAX861) The MAX861 contains a USB input that allows operation from either a source or a USB port. A USEL input allows the user to select either a 1mA or 5mA maximum charging current when using the USB input. If both V USB and V are valid, the MAX861 operates from. If V is invalid (undervoltage/overvoltage), the MAX861 operates from USB. When charging at 1mA from the USB input, the fast-charge timer is inhibited. EN Charger-Enable Input EN is a logic input (active low) that enables the charger. Drive EN high to disable the charger-control circuitry. Drive EN low or connect to for normal operation. Soft-Start To prevent input transients, the rate of change of charging current is limited. When the charger is turned on or when the input source is changed, charge current is ramped from to the set current value in typically 1.2ms. This also means that if charging is taking place from USB, and the input is then powered, charge current falls to zero and then is reramped to the charge rate. This is done to ensure that the source is not subjected to a severe load current step. Charge-current ramp up is also limited when transitioning from prequal to fast-charge, and when changing the USB charge current from 1mA to 5mA with USEL. There is no di/dt limiting, however, if ISET is changed suddenly using a switch at R. Thermal-Limit Control The feature a thermal limit that reduces the charge current when the die temperature exceeds +1 C. As the temperature increases above +1 C, the IC lowers the charge current by 5%/ C. Charge-Indicator Output is an open-drain output that indicates charger status. goes low during charge cycles where V BAT is greater than 3V and I BAT is greater than 7.5% of the maximum charge current set by R. When the are used in conjunction with a microprocessor (µp), connect a pullup resistor between and the logic I/O voltage to indicate charge status to the µp. Alternatively, can sink up to 2mA for an LED charge indicator. Fault Indicator (FLT) The contain an open-drain FLT output to signal the user when a fault occurs. FLT goes low if the charger is in prequal and the prequal timer expires, or if the charger is in fast-charge and the fastcharge time expires. FLT does NOT go low if the thermistor temperature is out of range. Toggle EN or the input power to reset the FLT indicator. Power-OK Indicator (POK) The contain an open-drain POK output that goes low when a valid input source is detected at or USB (MAX861 only). A valid input source is one whose voltage is between 4.15V and 7V and exceeds the battery voltage by 32mV. After a valid input has been established, charging is sustained with inputs as low as 3.5V as long as the input voltage remains above the battery voltage by at least 55mV (typ). POK is high impedance when the charger is disabled. Applications Information Figure 2 shows the typical operating circuit for the MAX861. The following section describes component changes for different charging current and timer durations. AC ADAPTER 4.5V TO 7V (OVP TO 16V) USB PORT 4.5V TO 5.5V 5mA 1μF 1mA OFF ON R 2kΩ USB USEL EN FLT POK BAT MAX861 1kΩ 1kΩ 33Ω 2.2μF NTC 1kΩ AT +25 C C.68μF TO LOGIC SUPPLY (3.3V) FAULT POWER-OK Figure 2. Typical Operating Circuit for USB/AC-Adapter Input Charger. An R of 2kΩ sets an AC adapter fast-charge of 75mA. 7

8 Table 1. Fault Temperatures for Different Thermistors THERMISTOR BETA Resistance at +25 C 1,Ω 1,Ω 1,Ω 1,Ω Resistance at +5 C Ω Ω 429.6Ω Ω Resistance at C 25,14.55Ω 27,148.9Ω 29,315.94Ω 31,656.9Ω Nominal Hot Trip Temperature C C C C Nominal Cold Trip Temperature C C +.46 C C Charge Current Selection The maximum charging current from a supply connected to is programmed by an external resistor (R ) connected from to. Calculate the R value as follows: R = 15 / I CHARGE(MAX) where I CHARGE(MAX) is in amps and R is in ohms. can also be used to monitor the actual chargecurrent level. The output voltage at is proportional to the charging current as follows: V = (I CHARGE x R ) / 1 Note that the prequal current for both USB and input operation is 1/1 of the fast-charge current set by R. Also, the top-off charge-current threshold for both USB and input operation is set to 7.5% of the fast-charge current set by R. I PREQUAL = 15 / R I TOP-OFF = / R Timer Capacitor Selection The contain timers for prequal, fast-charge, and top-off operation. These time periods are determined by the capacitance from to. To set the charge times, calculate C as follows: T FASTCHARGE = 334min x (C /.68µF) T PREQUAL = T TOPOFF = 34.8min x (C /.68µF) Note that when charging at 1mA from the USB input (MAX861), the fast-charge timer is inhibited. When halts charging, the timers stop and hold their value. Battery Temperature Control The monitor battery temperature through a negative TC thermistor which is in close thermal contact with the battery. Select a thermistor resistance that is 1kΩ at +25 C and has a beta of 35. The IC compares the resistance from to and suspends charging when it is greater than 28.3kΩ or less than 3.94kΩ, which translates to a temperature of C to +5 C. Table 1 shows the nominal temperature limits that result from a wide range of available thermistor temperature curves. The curves are defined by the following equation: 1 1 β R R T T = + 25 C e where β is the BETA term in Table 1. Connect to to disable the temperature-control function. When R disables charging, all timers pause and hold their value. Capacitor Selection Connect a 2.2µF ceramic capacitor from BAT to for proper stability. Connect a 1µF ceramic capacitor from to. If using the USB input for the MAX861, bypass USB to with a 1µF ceramic capacitor. Use a larger input bypass capacitor for high charging currents to reduce supply noise. All capacitors should be X5R dielectric or better. Be aware that some capacitors have large voltage coefficients and should be avoided. Thermal Considerations The are in a thermally enhanced TDFN package with an exposed paddle. Connect the exposed paddle of the package to a large copper ground plane to provide a thermal contact between the device and the circuit board. The exposed paddle transfers heat away from the device, allowing the IC to charge the battery with maximum current, while minimizing the increase in die temperature. Note that the s thermal-limit control allows the charger to be tolerant of thermally restricted PC board layouts that are sometimes unavoidable in compact portable designs. With such non-optimal layouts, the charger still operates, but may reduce charge current to manage temperature rise. 8

9 AC ADAPTER ON C1 1μF R1 2kΩ OFF EN +5V R3, R4 1kΩ FLT POK MAX8 BAT C3 2.2μF R5 1kΩ C4.68μF R2 1kΩ D1 GREEN LED CHARGE STATUS Li+ Input Sources The operating input voltage range is 4.15V to 7V. The device survives input voltages up to 16V without damage to the IC. If the input voltage is greater than 7.5V (typ), the IC stops charging. An appropriate power supply must provide at least 4.2V plus the voltage drop across the internal pass transistor when sourcing the desired maximum charging current. V IN(MIN) > 4.2V + I CHARGE(MAX) x R ON where R ON is the input-to-bat resistance (typically.5ω). Failure to meet this requirement results in an incomplete charge or increased charge time. Stand-Alone Li+ Charger The MAX8 provides a complete Li+ charging solution. Figure 3 shows the MAX8 as a stand-alone Li+ battery charger. The 2kΩ resistor connected to sets a charging current of 75mA. The LED indicates when fast-charge has begun. When fast-charge is complete, the LED turns off. Figure 3. Stand-Alone Li+ Battery-Charger with the MAX8 USB-Powered Li+ Charger (MAX861) The universal serial bus (USB) provides a high-speed serial communication port as well as power for the V I/O R3, R4 1kΩ R5 1kΩ VBUS C1 1μF USB FLT POK MAX861 BAT C2 2.2μF 5mA USB PORT R1 2kΩ USEL EN C3.68μF R2 1kΩ Li+ SYSTEM D+ D- Figure 4. USB Battery Charger with the MAX861 9

10 remote device. The MAX861 can be configured to charge its battery at the highest current possible from the host port. Figure 4 shows the MAX861 configured as a USB battery charger. A USEL input sets the maximum charging current from the USB input at 1mA or 5mA. Layout and Bypassing Connect the input capacitors as close to the device as possible. Provide a large copper plane to allow the exposed paddle to sink heat away from the device. Connect the battery to BAT as close to the IC as possible to provide accurate battery voltage sensing. Make all high-current traces short and wide to minimize voltage drops. For an example layout, refer to the MAX861 evaluation kit. Chip Information TRANSISTOR COUNT: 6838 PROCESS: BiCMOS Pin Configurations (continued) TOP VIEW + BAT 1 14 FLT USEL BAT MAX POK USB EN 14 TDFN 1

11 Package Information For the latest package outline information and land patterns, go to PACKAGE TYPE PACKAGE CODE DOCUMENT NO. 14 TDFN-EP T , 8, &1L, DFN THIN.EPS 11

12 Package Information (continued) For the latest package outline information and land patterns, go to COMMON DIMENSIONS SYMBOL MIN. MAX. A.7.8 D E A1..5 L.2.4 k.25 MIN. A2.2 REF. PACKAGE VARIATIONS PKG. CODE N D2 E2 e JEDEC SPEC b [(N/2)-1] x e T ±.1 2.3±.1.95 BSC MO229 / WEEA.4± REF T ±.1 2.3±.1.65 BSC MO229 / WEEC.3± REF T ±.1 2.3±.1.65 BSC MO229 / WEEC.3± REF T ±.1 2.3±.1.5 BSC MO229 / WEED-3.25±.5 2. REF T133-2 T ±.1 1.7±.1 2.3±.1 T ±.1 2.3±.1 2.3±.1.5 BSC MO229 / WEED-3.25±.5 2. REF.4 BSC ± REF.4 BSC ± REF 12

13 REVISION NUMBER REVISION DATE DESCRIPTION Revision History PAGES CHANGED 2 7/8 Corrected Absolute Maximum Rating /8 Corrected Absolute Maximum Ratings and made various updates 1, 2, 3, 6, 7 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 12 San Gabriel Drive, Sunnyvale, CA Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.

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