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19-3565; Rev 3; 12/08
KIT ATION EVALU ILABLE AVA
Single-/Dual-Input 1-Cell Li+ Chargers with OVP Protection and Programmable Charge Timer
General Description
The MAX8600/MAX8601 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 MAX8601 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 100mA or 500mA, depending on the USEL input. The MAX8600 is a single-input charger with no USB source input. The MAX8600/MAX8601 are available in a 3mm x 3mm power-enhanced TDFN package.
Features
Single- (MAX8600) or Dual- (MAX8601) Input Li+ Charger Up to 1A Programmable Fast-Charge 100mA/500mA USB Select Input (MAX8601) 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
MAX8600/MAX8601
Ordering Information
PART MAX8600ETD+ TEMP RANGE -40C to +85C -40C to +85C PIN-PACKAGE 14 TDFN-EP* 3mm x 3mm (T1433-2) 14 TDFN-EP* 3mm x 3mm (T1433-2) TOP MARK ABB AAC
Applications
Cell Phones Digital Cameras PDAs Portable Media Players MP3 Players Wireless Appliances
MAX8601ETD+
*EP = Exposed pad. +Denotes a lead(Pb)-free/RoHS-compliant package.
Typical Operating Circuit Pin Configurations
VLOGIC
TOP VIEW +
BAT SETI THM GND CT N.C. N.C.
1 2 3 4 5 6 7
14 13 12
FLT DC DC CHG POK N.C. EN
AC ADAPTER
DC
FLT POK CHARGE STATUS
GND USB PORT
CHG BAT
USB
MAX8600
11 10 9 8
MAX8601
Li+ 500mA 100mA OFF ON USEL EN SETI THM
CT
TDFN Pin Configurations continued at end of data sheet. ________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
Single-/Dual-Input 1-Cell Li+ Chargers with OVP Protection and Programmable Charge Timer MAX8600/MAX8601
ABSOLUTE MAXIMUM RATINGS
DC, USB to GND ....................................................-0.3V to +16V BAT, CT, CHG, EN, FLT, SETI, POK, THM, USEL to GND..................................-0.3V to +6.0V Continuous Power Dissipation (TA = +70C) 14-Pin TDFN 3mm x 3mm Multilayer PCB (derate 24.4mW/C above +70C) ........................ 1951.2mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
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.
ELECTRICAL CHARACTERISTICS
(VDC = VUSB = 5V, VBAT = 4V, V EN = 0V, RSETI = 2k, CCT = 0.068F, TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C. Note 1)
PARAMETER DC OR USB (Note 2) Input Voltage Range Input Operating Range Input Undervoltage Threshold Input Overvoltage Threshold Input Overvoltage Delay Input Supply Current Shutdown Input Current Input to BAT On-Resistance Input to BAT Dropout Voltage BAT BAT Regulation Voltage BAT Restart Fast-Charge Threshold IBAT = 0mA From BAT regulation voltage RSETI = 1.5k DC Charging Current VUSB = 0V RSETI = 2k RSETI = 5k Prequal, RSETI = 2k, VBAT = 2.5V VUSEL = 5V USB Charging Current Soft-Start Time BAT Prequal Threshold BAT Leakage Current SETI RSETI Resistance Range Guaranteed by charging current 1.5 5.0 k VDC = 0V VUSEL = 0V Prequal, RSETI = 2k, VBAT = 2.5V Ramp time to fast-charge current VBAT rising, 180mV hysteresis (typ) VDC = VUSB = 0V, VBAT = 4.2V 2.9 TA = +25C TA = -40C to +85C 4.179 4.166 -180 950 727 280 60 450 80 60 4.2 4.2 -150 1000 750 300 75 475 95 75 1.2 3.0 0.001 3.1 5 4.221 4.234 -120 1050 773 320 90 500 100 90 ms V A mA mA V mV (Note 3) Input rising, 500mV hysteresis (typ) Input rising, 200mV hysteresis (typ) From overvoltage event to charger disabled IBAT = 0mA, RTHM = 10k VEN = 5V, TA = +25C Input = 3.7V, VBAT = 3.6V Input falling, 200mV hysteresis (typ) 5 0 4.15 3.85 7.2 4.0 7.5 0.25 750 275 0.5 55 1200 435 0.8 120 14 7.00 4.15 7.8 V V V V s A A mV CONDITIONS MIN TYP MAX UNITS
2
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Single-/Dual-Input 1-Cell Li+ Chargers with OVP Protection and Programmable Charge Timer
ELECTRICAL CHARACTERISTICS (continued)
(VDC = VUSB = 5V, VBAT = 4V, V EN = 0V, RSETI = 2k, CCT = 0.068F, TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C. Note 1)
PARAMETER EN, USEL Logic Input Thresholds Logic Input Leakage Current POK, CHG, FLT Logic Output Voltage, Low Logic Output Leakage Current, High CHG CHG/Top-Off Threshold THM THM Pullup Resistance THM Resistance, Hot THM Resistance, Cold THM Resistance, Disabled CT Timer Accuracy Prequal Time Limit Charge Time Limit Top-Off Time Limit THERMAL LOOP Thermal-Limit Temperature Thermal-Limit Gain Junction temperature when the charge current is reduced, TJ rising Reduction of IBAT for increase of TJ, from VDC, RSETI = 1.5k +100 5 C %/C CCT = 0.068F From entering prequal to FLT low, VBAT < 3V From entering fast-charge to FLT low, 3V < VBAT < 4.2V From CHG high to charger disabled -20 34.8 334 34.8 +20 % min min min RTHM falling, 420 hysteresis (typ) RTHM rising, 2.7k hysteresis (typ) RTHM falling, 230 hysteresis (typ) 3.72 26.7 274 10 3.94 28.3 309 4.13 29.7 337 k k k IBAT falling, battery is charged RSETI = 1.5k RSETI = 2k RSETI = 5k 37.5 75 56.25 22.5 75.0 mA I POK, = I CHG = I FLT = 1mA V POK = V CHG = V FLT = 5.5V, VDC = VUSB = 0V TA = +25C TA = +85C 12 0.001 0.01 100 1 mV A Rising Falling V EN = VUSEL = 0 to 5.5V TA = +25C TA = +85C 0.4 0.001 0.01 1 1.6 V A CONDITIONS MIN TYP MAX UNITS
MAX8600/MAX8601
Note 1: Limits are 100% production tested at TA = +25C. Limits over the operating temperature range are guaranteed by design and characterization. Note 2: Input refers to either DC or USB. Note 3: Guaranteed by undervoltage- and overvoltage-threshold testing. For complete charging, the input voltage must be greater than 4.32V.
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Single-/Dual-Input 1-Cell Li+ Chargers with OVP Protection and Programmable Charge Timer MAX8600/MAX8601
Typical Operating Characteristics
(VDC = 5V, RSETI = 2k, VBAT = 3.6V, MAX8601 evaluation kit with thermal resistance of 50C/W. TA = +25C, unless otherwise noted.)
DISABLED SUPPLY CURRENT vs. INPUT VOLTAGE
MAX8600/01 toc02 MAX8600/01 toc01
SUPPLY CURRENT vs. INPUT VOLTAGE
1000 900 800 SUPPLY CURRENT (A) 700 600 500 400 300 200 100 0 0 2 4 6 8 10 12 14 INPUT VOLTAGE (V) VEN = 0V 1000 900 800 SUPPLY CURRENT (A) 700 600 500 400 300 200 100 0 0
CHARGE CURRENT vs. BATTERY VOLTAGE
1000 RSETI = 1.5k CHARGE CURRENT (mA) 800 600 400 200 RSETI = 2k RSETI = 3k DASHED DATA TAKEN WITH PULSE TESTING TO AVOID THERMAL LIMIT
MAX8600/01 toc03 MAX8600/01 toc06
VEN = 5V 0 2 4 6 8 10 12 14 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 VBAT (V) INPUT VOLTAGE (V)
CHARGE CURRENT vs. DC VOLTAGE
MAX8600/01 toc04
CHARGE CURRENT vs. USB VOLTAGE
700 CHARGE CURRENT (mA) 600 500 400 300 200 100 0 VUSEL = 0V VUSEL = 5V DASHED DATA TAKEN WITH PULSE TESTING TO AVOID THERMAL LIMIT
MAX8600/01 toc05
CHARGE CURRENT vs. INPUT VOLTAGE HEADROOM
1000 900 800 CHARGE CURRENT (mA) 700 600 500 400 300 200 100 0
800
1000 CHARGE CURRENT (mA) 800 600 400 200 0 0 2 4 6 8
RSETI = 1.5k RSETI = 2k
RSETI = 3k
DASHED DATA TAKEN WITH PULSE TESTING TO AVOID THERMAL LIMIT 10 12 14
0
2
4
6
8
10
12
14
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 (VIN - VBAT) (V)
VDC (V)
VUSB (V)
BATTERY REGULATION VOLTAGE vs. AMBIENT TEMPERATURE
MAX8600/01 toc07
CHARGE CURRENT vs. AMBIENT TEMPERATURE (750mA CHARGE)
900 800 CHARGE CURRENT (mA) 700 600 500 400 300 200 100 VBAT = 3.6V VBAT = 4V
MAX8600/01 toc08
4.210 BATTERY REGULATION VOLTAGE (V) 4.205 4.200 4.195 4.190 4.185 4.180 -40 -15 10 TA (C) 35 60
1000
0 85 -40 -15 10 TA (C) 35 60 85
4
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Single-/Dual-Input 1-Cell Li+ Chargers with OVP Protection and Programmable Charge Timer
Typical Operating Characteristics (continued)
(VDC = 5V, RSETI = 2k, VBAT = 3.6V, MAX8601 evaluation kit with thermal resistance of 50C/W. TA = +25C, unless otherwise noted.)
CHARGE CURRENT vs. AMBIENT TEMPERATURE (1A CHARGE)
1000 900 CHARGE CURRENT (mA) 800 700 600 500 400 300 200 100 -40 -15 10 TA (C) 35 60 85 RSETI = 1.5k 100 0 0.010 0.045 0.080 CCT (F) 0.115 0.150 VBAT = 3.6V VBAT = 4V
MAX8600/01 toc09
MAX8600/MAX8601
FAST-CHARGE TIME vs. CCT
700 FAST-CHARGE TIME (MIN) 600 500 400 300 200
MAX8600/01 toc10
1100
800
Pin Description
PIN MAX8600 1 MAX8601 1, 7 NAME FUNCTION Battery Connection. The IC delivers charging current and monitors battery voltage using BAT. Bypass BAT to GND with a 2.2F or larger ceramic capacitor. Connect both BAT inputs together externally (MAX8601). BAT is high impedance when the IC is disabled. DC Charge-Current Programming Input. Connect a resistor from SETI to GND to set the maximum charging current when using the DC input, the prequal current from either input, and the CHG turn-off threshold. Thermistor Input. Connect a 10k NTC thermistor, in close proximity to the battery, from THM to ground to monitor the battery temperature. Connect THM to GND to disable the thermistor functionality. The IC suspends charging when RTHM is outside the hot and cold limits. Ground Timing Capacitor Input. Connect a capacitor from CT to GND to set the precharge timeout, top-off time, and fast-charge timeout. Connect CT to GND to disable the timers. No Connection. Make no external circuit connection. Active-Low Enable Input. Drive low or connect EN to GND 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 DC or USB (MAX8601). POK is high impedance when EN is high. Charging-Status Output. CHG goes low when the battery is above 3V and being charged with a current greater than 7.5% of the current programmed with RSETI. CHG is high impedance when the charger is in prequal, top-off, or disabled.
BAT
2
2
SETI
3
3
THM
4 5 6, 7, 9 8 10
4 5 -- 8 10
GND CT N.C. EN POK
11
11
CHG
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Single-/Dual-Input 1-Cell Li+ Chargers with OVP Protection and Programmable Charge Timer MAX8600/MAX8601
Pin Description (continued)
PIN MAX8600 12, 13 MAX8601 12, 13 NAME FUNCTION DC Input Supply. Connect DC to a 4.5V to 7V charging source. Bypass DC to GND with a 1F or larger capacitor. DC takes priority over USB when both are present (MAX8601). Both DC 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. USB Input Source. Connect to a USB port. Bypass USB to GND with a 1F or larger capacitor. USB Charge-Select Input. Logic input that determines the maximum charge current drawn from the USB input. IBAT = 95mA when USEL = low, and IBAT = 475mA when USEL = high. Exposed Pad. Connect to the GND plane for optimum thermal dissipation.
DC
14 -- -- --
14 9 6 --
FLT
USB USEL EP
OFF POK = HIGH, CHG = HIGH, FLT = HIGH IBAT = 0A EN LOW AND POWER-GOOD SET TIMER = 0s THM OUT OF RANGE POK = PREVIOUS STATE CHG = PREVIOUS STATE IBAT = 0A PREQUAL TIMER HELD RTHM > 3.97k AND RTHM < 28.7k
VIN < 4.1V OR VIN < 7.5V OR VIN < VBAT OR EN HIGH ANY STATE
PREQUAL POK = LOW, CHG = HIGH IBAT = 150 / RSETI
VBAT < 3V AND PREQUAL TIMEOUT
FAULT CHG = HIGH FLT = LOW
RTHM < 3.97k OR RTHM > 28.7k VBAT < 2.82V SET TIMER = 0s VBAT > 3V SET TIMER = 0s IBAT > 112.5 / RSETI AND FAST-CHARGE TIMEOUT
THM OUT OF RANGE POK = PREVIOUS STATE CHG = PREVIOUS STATE IBAT = 0A FAST-CHARGE TIMER HELD
RTHM > 3.97k AND RTHM < 28.7k
RTHM < 3.97k OR RTHM > 28.7k IBAT < 172.5/RSETI AND VOLTAGE MODE SET TIMER = 0s
FAST-CHARGE POK = LOW, CHG = LOW IBAT(DC) = 1500 / RISET IBAT(USB) = 100mA / 500mA IBAT < 112.5 / RSETI AND VOLTAGE MODE SET TIMER = 0s
TOP-OFF POK = LOW, CHG = HIGH
VBAT < 4.05V SET TIMER = 0s
TOP-OFF TIMEOUT DONE POK = LOW, CHG = HIGH IBAT = 0A
Figure 1. Charger State Diagram 6 _______________________________________________________________________________________
Single-/Dual-Input 1-Cell Li+ Chargers with OVP Protection and Programmable Charge Timer
Detailed Description
DC Charging
The MAX8600/MAX8601 are designed to charge a single-cell Li+ battery from a DC source voltage between 4.15V and 7V. The precharge current, charge current, and top-off threshold are programmable with RSETI.
Fault Indicator (FLT)
The MAX8600/MAX8601 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 THM thermistor temperature is out of range. Toggle EN or the input power to reset the FLT indicator.
MAX8600/MAX8601
USB Charging (MAX8601)
The MAX8601 contains a USB input that allows operation from either a DC source or a USB port. A USEL input allows the user to select either a 100mA or 500mA maximum charging current when using the USB input. If both VUSB and VDC are valid, the MAX8601 operates from DC. If VDC is invalid (undervoltage/overvoltage), the MAX8601 operates from USB. When charging at 100mA from the USB input, the fast-charge timer is inhibited.
Power-OK Indicator (POK)
The MAX8600/MAX8601 contain an open-drain POK output that goes low when a valid input source is detected at DC or USB (MAX8601 only). A valid input source is one whose voltage is between 4.15V and 7V and exceeds the battery voltage by 320mV. 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.
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 GND for normal operation.
Applications Information
Figure 2 shows the typical operating circuit for the MAX8601. The following section describes component changes for different charging current and timer durations.
TO LOGIC SUPPLY (3.3V)
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 0 to the set current value in typically 1.2ms. This also means that if charging is taking place from USB, and the DC input is then powered, charge current falls to zero and then is reramped to the DC charge rate. This is done to ensure that the DC 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 100mA to 500mA with USEL. There is no di/dt limiting, however, if ISET is changed suddenly using a switch at RSETI.
100k AC ADAPTER 4.5V TO 7V (OVP TO 16V) DC 1F GND USB PORT 4.5V TO 5.5V FLT POK CHG BAT USB 2.2F
100k
330 FAULT POWER-OK
Thermal-Limit Control
The MAX8600/MAX8601 feature a thermal limit that reduces the charge current when the die temperature exceeds +100C. As the temperature increases above +100C, the IC lowers the charge current by 5%/C.
500mA 100mA OFF ON RSETI 2k USEL EN SETI
MAX8601 THM
NTC 10k AT +25C
CT
CHG Charge-Indicator Output
CHG is an open-drain output that indicates charger status. CHG goes low during charge cycles where VBAT is greater than 3V and IBAT is greater than 7.5% of the maximum charge current set by R SETI . When the MAX8600/MAX8601 are used in conjunction with a microprocessor (P), connect a pullup resistor between CHG and the logic I/O voltage to indicate charge status to the P. Alternatively, CHG can sink up to 20mA for an LED charge indicator.
CCT 0.068F
Figure 2. Typical Operating Circuit for USB/AC-Adapter Input Charger. An RSETI of 2k sets an AC adapter fast-charge of 750mA.
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7
Single-/Dual-Input 1-Cell Li+ Chargers with OVP Protection and Programmable Charge Timer MAX8600/MAX8601
Table 1. Fault Temperatures for Different Thermistors
THERMISTOR BETA Resistance at +25C Resistance at +50C Resistance at 0C Nominal Hot Trip Temperature Nominal Cold Trip Temperature 3000 10,000 4587.78 25,140.55 +55.14C -3.24C 3250 10,000 4299.35 27,148.09 +52.60C -1.26C 3500 10,000 4029.06 29,315.94 +50.46C +0.46C 3750 10,000 3775.75 31,656.90 +48.63C +1.97C
Charge Current Selection
The maximum charging current from a supply connected to DC is programmed by an external resistor (RSETI) connected from SETI to GND. Calculate the RSETI value as follows: RSETI = 1500 / ICHARGE(MAX) where ICHARGE(MAX) is in amps and RSETI is in ohms. SETI can also be used to monitor the actual chargecurrent level. The output voltage at SETI is proportional to the charging current as follows: VSETI = (ICHARGE x RSETI) / 1000 Note that the prequal current for both USB and DC input operation is 1/10 of the fast-charge current set by RSETI. Also, the top-off charge-current threshold for both USB and DC input operation is set to 7.5% of the fast-charge current set by RSETI. IPREQUAL = 150 / RSETI ITOP-OFF = 112.5 / RSETI
less than 3.94k, which translates to a temperature of 0C to +50C. 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 - 298 RT = R25C x e T + 273 where is the BETA term in Table 1. Connect THM to GND to disable the temperature-control function. When RTHM disables charging, all timers pause and hold their value.
Capacitor Selection
Connect a 2.2F ceramic capacitor from BAT to GND for proper stability. Connect a 1F ceramic capacitor from DC to GND. If using the USB input for the MAX8601, bypass USB to GND with a 1F 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.
Timer Capacitor Selection
The MAX8600/MAX8601 contain timers for prequal, fast-charge, and top-off operation. These time periods are determined by the capacitance from CT to GND. To set the charge times, calculate CCT as follows: TFASTCHARGE = 334min x (CCT / 0.068F) TPREQUAL = TTOPOFF = 34.8min x (CCT / 0.068F) Note that when charging at 100mA from the USB input (MAX8601), the fast-charge timer is inhibited. When THM halts charging, the timers stop and hold their value.
Thermal Considerations
The MAX8600/MAX8601 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 MAX8600/MAX8601s' 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.
Battery Temperature Control
The MAX8600/MAX8601 monitor battery temperature through a negative TC thermistor which is in close thermal contact with the battery. Select a thermistor resistance that is 10k at +25C and has a beta of 3500. The IC compares the resistance from THM to GND and suspends charging when it is greater than 28.3k or
8
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Single-/Dual-Input 1-Cell Li+ Chargers with OVP Protection and Programmable Charge Timer
+5V D1 GREEN LED R3, R4 100k DC AC ADAPTER C1 1F GND FLT POK CHG CHARGE STATUS R5 1k
DC Input Sources
The MAX8600/MAX8601 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. VIN(MIN) > 4.2V + ICHARGE(MAX) x RON
MAX8600/MAX8601
MAX8600 BAT
C3 2.2F
where RON is the input-to-BAT resistance (typically 0.5). Failure to meet this requirement results in an incomplete charge or increased charge time.
R2 10k Li+
OFF ON
Stand-Alone Li+ Charger
The MAX8600 provides a complete Li+ charging solution. Figure 3 shows the MAX8600 as a stand-alone Li+ battery charger. The 2k resistor connected to SETI sets a charging current of 750mA. The LED indicates when fast-charge has begun. When fast-charge is complete, the LED turns off.
EN
THM
SETI R1 2k
CT C4 0.068F
USB-Powered Li+ Charger (MAX8601)
Figure 3. Stand-Alone Li+ Battery-Charger with the MAX8600
The universal serial bus (USB) provides a high-speed serial communication port as well as power for the
VI/O R3, R4 100k VBUS C1 1F GND GND USB FLT POK CHG R5 100k
DC MAX8601 BAT C2 2.2F USEL 500mA USB PORT R2 10k THM CT C3 0.068F
Li+ SYSTEM
EN SETI R1 2k
D+ D-
Figure 4. USB Battery Charger with the MAX8601 _______________________________________________________________________________________ 9
Single-/Dual-Input 1-Cell Li+ Chargers with OVP Protection and Programmable Charge Timer MAX8600/MAX8601
remote device. The MAX8601 can be configured to charge its battery at the highest current possible from the host port. Figure 4 shows the MAX8601 configured as a USB battery charger. A USEL input sets the maximum charging current from the USB input at 100mA or 500mA.
Pin Configurations (continued)
TOP VIEW
+ BAT SETI THM GND CT USEL BAT
Layout and Bypassing
Connect the input capacitors as close to the device as possible. Provide a large copper GND 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 MAX8601 evaluation kit.
1 2 3 4 5 6 7
14 13 12
FLT DC DC CHG POK USB EN
MAX8601
11 10 9 8
Chip Information
TRANSISTOR COUNT: 6838 PROCESS: BiCMOS
14 TDFN
10
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Single-/Dual-Input 1-Cell Li+ Chargers with OVP Protection and Programmable Charge Timer
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
PACKAGE TYPE 14 TDFN-EP PACKAGE CODE T1433-2 DOCUMENT NO. 21-0137
MAX8600/MAX8601
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11
6, 8, &10L, DFN THIN.EPS
Single-/Dual-Input 1-Cell Li+ Chargers with OVP Protection and Programmable Charge Timer MAX8600/MAX8601
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
COMMON DIMENSIONS SYMBOL A D E A1 L k A2 MIN. 0.70 2.90 2.90 0.00 0.20 MAX. 0.80 3.10 3.10 0.05 0.40
PACKAGE VARIATIONS PKG. CODE T633-2 T833-2 T833-3 T1033-1 T1033-2 T1433-1 T1433-2 N 6 8 8 10 10 14 14 D2 1.500.10 1.500.10 1.500.10 1.500.10 1.500.10 1.700.10 1.700.10 E2 2.300.10 2.300.10 2.300.10 2.300.10 2.300.10 2.300.10 2.300.10 e 0.95 BSC 0.65 BSC 0.65 BSC 0.50 BSC 0.50 BSC 0.40 BSC 0.40 BSC JEDEC SPEC MO229 / WEEA MO229 / WEEC MO229 / WEEC MO229 / WEED-3 MO229 / WEED-3 ------b 0.400.05 0.300.05 0.300.05 0.250.05 0.250.05 0.200.05 0.200.05 [(N/2)-1] x e 1.90 REF 1.95 REF 1.95 REF 2.00 REF 2.00 REF 2.40 REF 2.40 REF
0.25 MIN. 0.20 REF.
12
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Single-/Dual-Input 1-Cell Li+ Chargers with OVP Protection and Programmable Charge Timer
Revision History
REVISION NUMBER 2 3 REVISION DATE 7/08 12/08 DESCRIPTION Corrected Absolute Maximum Rating Corrected Absolute Maximum Ratings and made various updates PAGES CHANGED 2 1, 2, 3, 6, 7
MAX8600/MAX8601
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, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13 (c) 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.

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