Fully integrated charger with pass transistor, reverse-blocking d

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Fully integrated charger with pass transistor, reverse-blocking d

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Fully Integrated High Current Lithium-Ion Battery Charger System
Fully integrated charger with pass transistor,
reverse-blocking diode, sense resistor thermal protection 4.1V, 4.2V Adjustable Output Voltage Programmable precharge, fastcharge termination current Battery voltage controlled accuracy Soft-start step load adaptor plug-in 1.5A continuous charge current Charge current monitor output from microcontroller Interface Input voltages range from 4.2V 0.1µA Battery leakage shutdown monitor modes Operates without battery regulated mode Small lead package thermal impedance 50°C/watt external components Over current protection charging modes Over voltage protection outputs able drive LEDs interface host processor Remote Kelvin sensing battery terminal Small input output filter capacitors Status output communicates charging charge cycle Available Lead-Free Packaging Charges Li-Ion, Li-Polymer, NiCd NiMH Batteries
SC801 fully integrated, single cell, Lithium-Ion\Li-Polymer battery charger management system. SC801 built intelligence extreme functionality. When battery voltage below 2.8V charger operates precharge mode with charging current 125mA based ITERM resistor. This pre-charge mode limit power dissipation undercharged battery. When battery voltage exceeds 2.8V, charger enters fast charge mode. this mode, SC801 delivers 1.5A battery based IPRGM resistor. part also features current termination, ending charge cycle when battery charged charge current drops below current programmed ITERM resistor. addition, charge current monitored voltage IPRGM allowing microcontroller access current information determine when externally terminate charge cycle. Once charge cycle complete terminates, device enters charge monitor mode where output voltage battery monitored. this voltage drops below recharge threshold device will enter fast charge mode again, bring battery fully charged state. Both shutdown monitor modes drain more than from battery guaranteed. output voltage battery controlled within programmed voltage either 4.1V 4.2V. SC801 also function general purpose current source current source charging nickelcadmium (NiCd) nickel-metal-hydride (NiMH) batteries using external termination.
Applications
Typical Application Circuit
Cellular phones PDAs Handheld computers Handheld meters Charging stations Digital cameras
BSEN
ESEN
Charge Current
Revision April 2003
Fast Charge Current 1000 Termination Current
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POWER MANAGEMENT Absolute Maximum Ratings
Exceeding specifications below result permanent damage device, device malfunction. Operation outside parameters specified Electrical Characteristics section implied.
Parameter VCC, VOUT, VPRGM, IPRGM, OVP, STAT, ITERM, Power Dissipation (Derate 20mW/ above VOUT short Thermal Resistance, Junction Ambient Operating Junction Temperature Lead Temperature Storage Temperature (Soldering) seconds Rating (Human Body Model)
Symbol
Maximum -0.3 14.0 -0.3 +6.0
Units
Continuous
TLEAD TSTG
°C/W
Tied with Square Inch, Ounce Copper
Electrical Characteristics
Unless otherwise noted: 4.75V 5.25V
Parameter
Symbol
Conditions
25°C
(-40°C +85°C)
Units
Input Voltage Operating Voltage Operating Current
Charging Mode OVP, STATUS, Mode OVP, STATUS,
Battery Leakage Current Regulated Voltage Adjust Mode Feedback Voltage Battery Pre-Charge Current Battery Termination Current Battery Fast-Charge Current
IVOUT VBAT
VPRGM Logic High VPRGM Logic VPRGM External Divider 4.2V 6.5V
4.20 4.10 4.16 4.06 2.97
4.24 4.14 3.03
ITERM ITERM Resistor 3.01k VBATTERY 2.5V
IPRGM 3.01k IPRGM 1.87k VBATTERY 3.8V Dropout Voltage 550mV
2002 Semtech Corp.
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POWER MANAGEMENT Electrical Characteristics Cont.
Unless otherwise noted: 4.75V 5.25V
Parameter
Symbol
Conditions
25°C
(-40°C +85°C)
Units
Battery Fast-Charge Current Limit IPROG Regulated Voltage UVLO Rising Threshold Adjust Mode Threshold Voltage VBAT Precharge Threshold VBAT Recharge Threshold Rising Threshold Falling Threshold Hysteresis Over Temperature Shutdown Status Output Source Current Hysteresis 10°C Pre-Charge Fast-Charge VSTAT 2.8V Charge, VSTAT= 0.25V Adaptor mode, High Impedance Output Source Current Output Source Current BSENSE Input Leakage Current STAT, OVP, Outputs Load 10mA Load BIP, VPRGM Inputs Load -500µA UVLO VBAT VBATTERY 2.8V VBATTERY VBAT Dropout voltage
1.5**
6.525
0.25
Thermally Limited
2002 Semtech Corp.
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POWER MANAGEMENT Configuration
VOUT VOUT BSEN VPRGM IPRGM ITERM STAT
Ordering Information
DEVICE(1) SC801IMLTR SC801IMLTRT(2) SC801EVB(3) PACKAGE MLP16 MLP16 Evaluation Board
VIEW
Notes: Only available tape reel packaging. reel contains 3,000 devices. extension designates lead-free leadframe package option. Specify desired part number when ordering.
MLP16: LEAD
Descriptions
Name BSEN VPRGM IPRGM ITERM Function Battery voltage sense pin. Connect battery terminal Kelvin sense battery voltage. leave this floating. Selectable voltage program pin. Logic 4.1V. Logic high 4.2V. Resistor adjustable. Charger current program fast charge mode. Requires resistor ground program fast-charge current. Selection current termination pre-charge current. Requires resistor ground program pre-charge termination current. Connect Ground Device enable/disable pin. Logic high enables device. Logic disables device. Input derived from external circuitry microcontroller that signals Battery Place. Logic high indicates Battery Place charging mode. Logic puts device into mode. leave this floating. Overvoltage fault flag charger input voltage higher than 6.5V This Source 10mA. Charger Status Pin: Pre-charge (High), Fastcharge (High) charge (Low). When mode this high impedance. This source 10mA. Charger present indicator, logic high when there power pins regardless Enable state. This source 10mA. Connect Supply pin, connect adaptor power. Supply pin, connect adaptor power. Charger output, connect battery. Charger output, connect battery.
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STAT VOUT VOUT
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POWER MANAGEMENT Block Diagram
13,14
Fast Charge Enable Control 1.2V Reference 1.2V 4.2V Charge Pump
4.1V
15,16 VOUT
STAT BSEN
Status
3.0V Vout
Termination
1.2V Vprog Detect V_FB 4.2V 4.1V 3.0V 1.2V Termination
VPRGM
ITERM
IPRGM
2002 Semtech Corp.
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POWER MANAGEMENT Applications Information
Pre-Charge Mode Pre-charge mode automatically enabled whenever battery voltage below 2.8V. primarily used limit power dissipation battery SC801 device whenever battery undercharged. battery begins charge this mode, voltage battery will rise when 2.8V limit reached, SC801 will switch fast charge mode. precharge current value selected termination resistor ITERM pin. maximum range precharge current from 10mA 125mA. Whenever charger pre-charge fast-charge status will light indicating that battery being charged. equation select pre-charge current given
TERM
Monitor Mode monitor mode voltage battery will monitored against programmed voltage. This will occur after battery been fully charged device shut off. voltage battery falls below recharge threshold (specified 200mV) charger will activate charge battery programmed voltage. This means that will enter full charging sequence from fast-charge terminating charging cycle when programmed termination current reached. maximum current drain battery during monitor mode will more than over temperature. Mode nice features SC801 ability work with without battery. battery place device enter mode. this mode SC801 will like dropout regulator. output voltage 4.1V, 4.2V externally resistor divider. section titled Configuring Output Voltage Battery setting output voltage other than 4.1V 4.2V. input (Battery Place) used switch SC801 from charger mode mode. this logic high device will charger mode, logic will mode. During mode device will regulate output voltage with current limit resistor tied IPRGM pin. tied place device charge mode whenever adaptor place. maximum voltage input input since this voltage exceed some conditions. should never left floating, instead, should tied through pullup/pull-down resistors when connected high impedance control pin, otherwise connected directly GND. equation setting current limit mode will
1000 ILDO PRGM
Fast-Charge Mode fast-charge mode exists while battery voltage above 2.8V battery fully charged. fastcharge current maximum 1.5A selected program resistor IPRGM pin. fact, voltage this will represent current through battery enabling microprocessor analog-to-digital converter (ADC), monitor battery current sensing voltage IPRGM pin. equation fast-charge current given
1000 RPRGM
Note that given program resistor current through battery determined replacing with actual voltage IPRGM above equation. Termination Current Once battery reaches program voltage 4.1V, 4.2V externally voltage, device will transition from constant current source constant voltage source, current through battery begins decrease while voltage remains constant. During this time when current falls below programmed termination current termination resistor ITERM pin, SC801 will turn charge will indicated status turning off. equation termination current given
ITERM TERM
2002 Semtech Corp.
Flags There three drivers SC801: (Over Voltage), STAT (Status) (Charger Present). Each output drive directly without current limit resistor. addition, each output monitored microprocessor change their status. table above defines each output.
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POWER MANAGEMENT Applications Information (Cont.)
STAT
POWER OVERVOLTAGE BATTERY CHARGIN
POWER VOLTAGE ORMAL BATTERY FULLY CHARGED
HIGH IMPEDANCE
ATTE
330pF 100K
MODE
TATU
output used UVLO indicator. Regardless state output reflects voltage (adapter) input. When above UVLO, high, 2.8V. When below UVLO, low, also device into charge mode whenever adaptor power, connecting pin. will light whenever SC801 enabled there overvoltage pins. When this occurs SC801 will turn stay long overvoltage condition remains. soon overvoltage removed SC801 will resume operation. will light part disabled, even though overvoltage present pins.
VOUT
FIGURE
Remote Kelvin Sensing Battery Another nice feature SC801 ability sense battery voltage directly battery with Kelvin BSEN pin. This allows designer great flexibility layout achieves much greater accuracy sensing battery voltage where counts, battery terminals! Therefore, when laying designer should route BSEN directly terminal which battery gets connected. addition, mode, BSEN will still need sense output voltage. mode, BSEN becomes regulation feedback control-loop. this case sensing Configuring Output Voltage Battery output voltage itself, since battery place. battery voltage VPRGM pin. this Therefore BSEN should never left floating. logic high output voltage 4.2V. this logic output voltage will 4.1V. VPRGM Capacitor Selection tied 4.2V operation ground Input output capacitors cost ceramic type. 4.1V operation. value other than 4.1V 4.2V output capacitance range 4.7uF. input resistor divider required. This divider between capacitor should between 0.1uF 1uF. VOUT VPRGM with divider connected BSEN pin. schematic such Overcurrent Temperature Protection connection equation output voltage Overcurrent protection inherent SC801. given Figure output voltage Figure will SC801 operates current source output curset 4.77V with resistors shown. capacitor rent limited mode time. needed stability reduced ripple volt- fast-charge mode current limited IPRGM age. advisable leave room adding resistor, fast-charge current. When output voltthis capacitor, since left needed. less than 2.8V, current limited ITERM evaluation board does have place resistor resistor, pre-charge current. Both these functions divider capacitor allow adjustable voltage protect device event short circuit condition this board (see schematic output. mode current limited page 10). With removed, jumper should fast-charge current, provided there voltage added complete changes required adjustable output. Under short circuit condition mode mode operation evaluation board. further current will enter hiccup mode. temperature evaluation board information, section tilted Evalu- shutdown protect device conditions excess ation Board. current well, shutting down device when
2002 Semtech Corp.
temperature exceeds 165oC.
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POWER MANAGEMENT Applications Information (Cont.)
Using SC801 With Charge Controller SC801 also used with numerous charge controller market. many instances charge controller will control charging termination SC801. best method interfacing SC801 with such device place SC801 mode, monitor current battery that samples voltage IPRGM pin. Slow fast charge controlled placing resistors series from IPRGM adding transistor switch across resistors. This current monitored proper termination charge controller. mode STAT will light. When charging battery mode charge profile will same charge mode except there will precharge termination current function. Meanwhile, maximum current battery will battery equivalent circuit fast-charge current limit. battery will still charge this mode, albeit slightly different approach than placing charger charge mode. Evaluation Board evaluation board shown Page evaluation board designed test complete operation SC801 SC801M. Note minimum parts requirement shown within dotted rectangle schematic. adaptor voltage applied which supplies power SC801. output charger voltage output voltage taken TP5. Jumper will device mode when inserted charge mode when left open. Jumper will enable device when inserted disable device when left open. Note long power applied will light, regardless level. Jumper used measure bias current SC801 should always place except when measuring bias current. charge limit voltage 4.2V 4.1V respectively. Only these jumpers should place given time. expect exceed (testing breakdown SC801) want output voltage 4.2V should remove jumper manually pin, because absolute maximum voltage VPRGM input Jumper when inserted will short BSEN line Vout charging Lithium-Ion batteries. Jumper should inserted when adjustable voltage required, with addition more information about
2002 Semtech Corp.
selection adjustable voltage section titled, Configuring Output Voltage Battery. Note, only these jumpers should inserted given time. Jumper should left open used only testing SC801M operation. Connector used connecting evaluation board demonstration platform exemplify SC801 operation. Other components eval board consist Semtechs SD12 SD05 clamp diodes which should part system requiring protection. LEDs status information which will allow current through battery monitored. input capacitor chosen 10uF decouple inductance from laboratory supply when evaluation taking place. Complete Charge Cycle complete charge cycle SC801 shown page pre-charge current will under control until precharge threshold 2.8V reached. this time device enters fast-charge mode output voltage continues increase constant current applied battery. Eventually constant voltage reached current begins decrease until termination current threshold reached which time SC801 will turn off. Many Lithium-Ion batteries have built under-voltage detect circuit. This makes battery pack open circuited when battery voltage falls below typically. With these batteries SC801 will unlikely enter pre-charge operation because battery voltage will always above 2.8V.
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POWER MANAGEMENT Applications Information (Cont.)
Layout Guidelines keep traces from adaptor input pins wide possible, eliminate voltage drop across device input traces. want make sure input-to-output voltage differential device does approach dropout voltage. curve dropout voltage output current shown page voltage dropped over input traces from adaptor will reduce dropout voltage margin. Make high current output trace from VOUT pins wide possible. BSEN line should used properly compensate voltage drops from output trace battery. Make Kelvin connection with BSEN trace where VOUT connects battery terminals. This done taking BSEN trace tying VOUT trace close battery terminals possible. This way, voltage drop across trace resistance battery will compensated because BSEN will regulate device output voltage (VOUT) point connects VOUT trace. BSEN line VOUT device will eliminate benefit purpose trace resistance drop will compensated. Therefore, best have BSEN trace follow parallel VOUT trace them together contact point battery terminal best result. bottom SC801 package heat slug this slug should tied ground plane through large series smaller vias. there ground plane, area should dedicated bottom heat sink. evaluation board square inch copper allows output current greater that more copper tied this slug greater output current available before thermal limitations dominate. pins that labeled connected die. Therefore, tying these pins ground plane offers aide heat removal electrical benefit.
2002 Semtech Corp.
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POWER MANAGEMENT Evaluation Board Schematic
4.2V ISEN BIAS 4.1V
ABLE ISABLE
BSEN
MINIMUM PARTS REQUIREMENT WITHIN DOTTED LINE
Evaluation Board Gerber Plots
Gerber Bottom Gerber
Inner Gerber
Silk Screen Gerber
2002 Semtech Corp.
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POWER MANAGEMENT Mode Timing Diagram
Mode
6.5V 6.3V
4.2V 4.2V
Vout
ILIMIT
ILIMIT
Iout
Precharge Limit
Soft Start
Stat
High
2002 Semtech Corp.
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POWER MANAGEMENT Charge Mode Timing Diagram
Charge Mode
4.2V
4.2V 4.0V
Vout
2.8V precharge Icharge Soft Start Precharge Limit Termination Current Charge
Iout
Stat
Monitor Mode
2002 Semtech Corp.
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POWER MANAGEMENT State Diagram
UVLO
Shutdown Mode Vout/Iout CP,STAT,OVP
Output High
High Tj<Over Temp Mode STAT=High High Charge Mode STAT=High,
Over Voltage, Under Voltage, Over Temperature will force SC801 into Shutdown Mode from state.
Start Pre-Charge VOUT=CV Iout=280/Rterm 1500/Rprog Current Limit VBAT>2.8V
VBAT 2.8V Soft Start Fast Charge Mode
Iout=1500/Rprog
VOUT=CV 1500/Rprog Start Mode VOUT=CV IOUT ITERM Monitor Mode STAT=Low Vout
VBAT CV-200mv
2002 Semtech Corp.
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POWER MANAGEMENT Typical Characteristics
Mode Bias Current Input Voltage
Input Voltage (Volts)
Charge Mode Bias Current Input Voltage
Bias Current (mA) 1.75 1.25 Input Voltage (Volts)
Bias Current (mA)
Fast Charge Current IPRGM Resistance
Fast Charge Current (mA) 1400 1000 27.6 IPRGM Resistance (kohm
Leakage Current (uA)
Vout Leakage Current Temperature
1200
Temperature (Degrees
Output Voltage vsTemperature
4.21 Output Voltage (Volts) Output Voltage (Volts) 4.11
Output Voltage Temperature
4.19
ILOAD 250mA ILOAD 500mA
4.09
ILOAD 250mA ILOAD 500mA
4.18 Temperature (Degrees
4.08 Temperature (Degrees
2002 Semtech Corp.
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POWER MANAGEMENT Typical Characteristics
Dropout Voltage Output Current
Dropout Voltage (mV)
IPRGM Voltage (mV)
IPRGM Voltage Output Current
1600 1400 1200 1000 1000 Output Current (mA)
1010 Output Current (mA)
RPRGM 1.87K
Battery Charge Profile
Charge Voltage (Volts) 0:00 0:10 0:20 0:30 0:40 0:50 1:00 1:10 1:20 1:30 1:40 1:50
Charge Current (Amps)
Vout Iout
Charge Time
2002 Semtech Corp.
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POWER MANAGEMENT Outline Drawing pin)
Marking Information
Mark
two-digit year manufacture two-digit week manufacture
2002 Semtech Corp.
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POWER MANAGEMENT Land Pattern MLP-16 (Standard Lead)
DIMENSIONS
INCHES 0.0880 0.0090 0.0085 0.0170 0.0290 0.1620
2.2352 0.2286 0.2159 0.4318 0.7366 4.1148
Land Pattern MLP-16 (Extended Lead)
DIMENSIONS
INCHES 0.0880 0.0090 0.0085 0.0170 0.0390 0.1820
2.2352 0.2286 0.2159 0.4318 0.9906 4.6228
Contact Information
Semtech Corporation Power Management Products Division Mitchell Rd., Newbury Park, 91320 Phone: (805)498-2111 (805)498-3804
2002 Semtech Corp. www.semtech.com

Fully integrated charger with pass transistor, reverse-blocking d

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