Adapter/USB Tri-Mode Single-cell Li-ion Charger POWER MANAGEMENT

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Adapter/USB Tri-Mode Single-cell Li-ion Charger POWER MANAGEMENT

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SC811 SC813
Adapter/USB Tri-Mode Single-cell Li-ion Charger
POWER MANAGEMENT Features
Single input charger with three charging modes Constant voltage 4.2V, regulation Fast-charge current regulation 70mA, 700mA Charging current regulation, voltage regulation, thermal limiting Input voltage protection Current-limited adapter support capability reduces power dissipation charger high power modes limit charge current prevent Vbus overload Instantaneous CC-to-CV transition faster charging Programmable battery-dependent currents (adapter mode fast- pre-charge, termination) Programmable source-limited currents (USB-high mode fast-charge, USB-low mode fast- pre-charge) Independent programming termination current with dual-mode operation Three termination options float-charge, automatic re-charge, forced re-charge keep battery topped-off after termination without float-charging Soft-start reduces adapter load transients High operating voltage range SC811 permits unregulated adapters Complies with CCSA YD/T 1591-2006 Space saving 2x2x0.6 (mm) MLPD package WEEE RoHS compliant
Description
SC811 SC813 highly versatile single input triple mode (adapter/USB high current, current) linear single-cell Li-ion battery chargers, each lead MLPD ultra-thin package. input will survive sustained input voltage protect against plug overshoot faulty charging adapters. SC811 9.6V rising, 8.2V falling thresholds general purpose charging with cost adaptors. SC813 rising, 5.6V falling thresholds customers utilizing charging adapters with specifications that similar Vbus supply. SC811 SC813 differ only threshold. Charging begins automatically when input source applied charging input. Thermal limiting protects against excessive power dissipation. charger programmed turn when charging complete continue operating regulator while float-charging battery. Three charging modes provided: adapter mode, power mode, high power mode. Batterycapacity-dependent charging source-dependent current programming independently programmed. Adapter high power modes charge with charging adapter operating either voltage regulation current limit obtain lowest possible power dissipation. single current programming used program pre-charge, termination, adaptermode fast-charge currents fixed proportions. modes, second programming used program power pre-charge current high power fast-charge currents. This configuration allows independent programming termination current. modes dynamically limit charging load necessary prevent overloading Vbus supply.
Applications
Mobile phones players handheld receivers
Typical Application Circuit
VADAPTER MODE SELECT MODE STATB
SC811 SC813
IPRGM IPUSB Battery Pack Device Load
April 2008
2008 Semtech Corporation
SC811 SC813
Configuration Ordering Information
Device
SC811ULTRT(1)(2) SC813ULTRT(1)(2)
VIEW MODE
Package
MLPD-UT-8 MLPD-UT-8 Evaluation Board Evaluation Board
SC811EVB SC813EVB
Notes: Available tape reel only. reel contains 3,000 devices. Lead-free package only. Device WEEE RoHS compliant.
STATB
IPRGM
IPUSB
MLPD-UT8; 2x2, LEAD 68°C/W
Marking Information
Date Code
2008 Semtech Corporation
SC811 SC813
Absolute Maximum Ratings
-0.3 +30.0 BAT, IPRGM, IPUSB -0.3 +6.5 STATB, ENB, MODE -0.3 VBAT Input Current Total Power Dissipation BAT, IPRGM, IPUSB Short Duration Continuous Protection Level(1) (kV)
Recommended Operating Conditions
Operating Ambient Temperature (°C) SC811: Adapter Mode Operating Voltage(2) 4.60 8.20 Modes Operating Voltage(2) 4.35 8.20 SC813: Adapter Mode Operating Voltage(2) 4.60 5.60 Modes Operating Voltage(2) 4.35 5.60
Thermal Information
Thermal Resistance, Junction Ambient(3) (°C/W) Junction Temperature Range (°C) +150 Storage Temperature Range (°C) +150 Peak Reflow Temperature (°C) +260
Exceeding above specifications result permanent damage device device malfunction. Operation outside parameters specified Electrical Characteristics section recommended. NOTES: Tested according JEDEC standard JESD22-A114-B. This input voltage which charger guaranteed begin operation. Maximum operating voltage maximum Vsupply defined EIA/JEDEC Standard paragraph 2.11. Calculated from package still air, mounted (in), layer with thermal vias under exposed JESD51 standards.
Electrical Characteristics
Test Conditions: VVIN 4.75V 5.25V; VBAT 3.7V; values 25°C; -40°C 85°C, unless specified.
Parameter
Adapter Mode Rising Threshold Adapter Mode Falling Threshold Modes Rising Threshold Modes Falling Threshold Modes Hysteresis
Symbol
VTADUVLO-R VTADUVLO-F VTUSBUVLO-R VTUSBUVLO-F VTUSBUVLO-H
Conditions
4.30
4.45 2.85 4.20
4.60 3.00 4.35
Units
VVIN VBAT VVIN VBAT VVIN VBAT VTUSBUVLOR VTUSBUVLOF modes, SC811
2.70
3.65
4.00
5.85
Rising Threshold
VTOVP-R modes, SC813 modes, SC811
Falling Threshold
VTOVP-F modes, SC813 VTOVP-R VTOVP-F modes, SC811 5.75
Hysteresis
VTOVP-H VTOVP-R VTOVP-F modes, SC813
2008 Semtech Corporation
SC811 SC813
Electrical Characteristics (continued)
Parameter
Charging Disabled Quiescent Current Charging Enabled Quiescent Current Regulation Voltage Voltage Load Regulation Re-charge Threshold Pre-charge Threshold (rising)
Symbol
IqVIN_DIS IqVIN_EN VCV_LOAD VTReQ VTPreQ lBAT_V0
Conditions
VENB VBAT VENB excluding IBAT, IIPRGM, IIPUSB IBAT 50mA, -40°C 125°C Relative 50mA, IBAT -40°C 125°C VBAT
4.24
Units
4.16 2.85
4.20
2.90
2.95 29.4
VBAT VCV, VVIN VBAT VCV, VVIN VENB VBAT VCV, VVIN connected 2.05 RIPRGM 2.94k, VTPreQ VBAT RIPRGM 2.94k, 1.8V VBAT VTPreQ RIPRGM 2.94k, VBAT 2.05 RIPUSB 4.42k, 1.8V VBAT VTPreQ RIPUSB 4.42k, 1.8V VBAT IBAT 700mA, 125°C VVIN 5.0V, VTPreQ VBAT 1.8V VBAT VTPreQ VBAT (either input selected) VVIN VTPreQ VBAT VVIN VBAT VTPreQ supply current limit 500mA, VMODE RIPUSB 3.65k (559mA)
Battery Leakage Current
lBAT_DIS lBAT_MON
IPRGM Programming Resistor Fast-Charge Current, Adapter Mode Pre-Charge Current, Adapter Mode High Power Mode Termination Current, Mode IPUSB Programming Resistor Fast-Charge Current, High Power Mode Pre-Charge Current Fast-Charge Current, Power Mode Dropout Voltage IPRGM Fast-charge Regulated Voltage IPRGM Pre-charge Regulated Voltage IPRGM Termination Threshold Voltage IPUSB Fast-charge Regulated Voltage IPUSB Pre-charge Power Mode Regulated Voltage Modes Under-Voltage Load Regulation Limiting Voltage
RIPRGM IFQ_AD IPreQ_AD ITERM RIPUSB IFQ_USB IPreQ_USB VIPRGM_FQ VIPRGM_PQ VTIPRGM_TERM VIPUSB_FQ VIPUSB_PQ
29.4
0.40 2.04 0.408 0.204 2.04 0.408
0.60
VUVLR
4.45
4.58
4.70
2008 Semtech Corporation
SC811 SC813
Electrical Characteristics (continued)
Parameter
Thermal Limiting Threshold Temperature Thermal Limiting Rate MODE Input High Voltage Threshold MODE Input Voltage Range MODE Input Voltage Threshold Input High-range Threshold Input Current Input High-range Sustain Input Current MODE Input High-range Input Current MODE Input Mid-range Load Limit MODE Input Low-range Input Current MODE Input Monitor State Input Current MODE Input Leakage STATB Output Voltage STATB Output High Current
Symbol
IENB_IH_TH
Conditions
Units
current required pull from floating midrange into high range Current required hold high range, VENB VBAT, VBAT 4.2V VMODE Input will float range when this load limit observed. (VENB VMODE) VMODE VBAT 4.2V, VENB Charging Terminated VVIN VVIN VENB VMODE VBAT 4.2V ISTAT_SINK VSTAT
IENB_IH_SUS IMODE_IH IMODE_MON IILEAK VSTAT_LO ISTAT_HI
Notes: Sustained operation VTADUVLO-F VVIN guaranteed only current limited charging source applied pulled below VTADUVLO-R charging load; forced voltage below VTADUVLO-R some cases result regulation errors other unexpected behavior.
2008 Semtech Corporation
SC811 SC813
Typical Characteristics
Line Regulation
IBAT 50mA 4.204 4.204
Load Regulation
VVIN
4.196
4.196
VBAT
VBAT
4.192
4.192
4.188
4.188
4.184
4.184
4.18
4.18
VVIN
IBAT (mA)
Temperature Regulation
VVIN IBAT 50mA 4.204
High Line Regulation
VBAT 3.7V
RIPRGM RIPUSB 2.94k
4.196
IBAT (mA)
VBAT
4.192
4.188
4.184
RIPRGM RIPUSB 4.42k
4.18
Ambient Temperature
VVIN
High VBAT Regulation
VVIN
High Temperature Regulation
VVIN VBAT 3.7V
RIPRGM RIPUSB 2.94k
RIPRGM RIPUSB 2.94k
IBAT (mA)
RIPRGM RIPUSB 4.42k
IBAT (mA)
RIPRGM RIPUSB 4.42k
VBAT
Ambient Temperature
2008 Semtech Corporation
SC811 SC813
Typical Characteristics
Line Regulation
VBAT 2.6V RIPRGM RIPUSB 2.94k
Temperature Regulation
VVIN VBAT 2.6V
RIPRGM RIPUSB 2.94k
IBAT (mA)
IBAT (mA)
RIPRGM RIPUSB 4.42k
RIPRGM RIPUSB 4.42k
VVIN
Ambient Temperature
Power Line Regulation
VBAT 3.7V
Power VBAT Regulation
VVIN
RIPUSB 2.94k
RIPUSB 2.94k
IBAT (mA)
IBAT (mA)
RIPUSB 4.42k
RIPUSB 4.42k
VVIN
VBAT
Power Temperature Regulation
VVIN VBAT 3.7V
RIPUSB 2.94k
IBAT (mA)
RIPUSB 4.42k
Ambient Temperature
2008 Semtech Corporation
SC811 SC813
Typical Characteristics
IFQ_AD RIPRGM IFQ_USB High Power RIPUSB
VVIN VBAT 3.7V, 1000
IPQ_AD IPQ_USB RIPRGM, IFQ_USB Power RIPUSB
VVIN VBAT 2.6V,
IBAT (mA)
IBAT (mA)
RIPRGM RIPUSB
RIPRGM RIPUSB
Charging Cycle Battery Voltage Current
850mAhr battery, RIPRGM 2.94k, VVIN 5.0V,
Pre-Charging Battery Voltage Current
850mAhr battery, RIPRGM 2.94k, VVIN 5.0V, IBAT VBAT 2.75 2.25
VBAT (V), Internal Power Dissipation
VBAT IBAT
3.75 3.25
IBAT (mA)
2.25
0.25
0.75
1.25
1.75
Time (hrs)
Time
CC-to-CV Battery Voltage Current
850mAhr battery, RIPRGM 2.94k, VVIN 5.0V, 4.21
Re-Charge Cycle Battery Voltage Current
850mAhr battery, RIPRGM 2.94k, VVIN 5.0V, Load 10mA VBAT IBAT Discharge hours omitted.
VBAT (V), Internal Power Dissipation
IBAT
IBAT (mA)
4.18 VBAT 4.17
4.16
44.5
45.5
46.5
47.5
Time (min)
Time (hrs)
2008 Semtech Corporation
IBAT (mA)
VBAT
4.19
IBAT (mA)
VBAT
SC811 SC813
Typical Characteristics
Mode Reselection High
VVIN=5V, VBAT=3.7V
Mode Reselection High
VVIN=5V, VBAT=3.7V
IBAT (100mA/div)) VMODE (2V/div) VMODE (2V/div)
VMODE=0V- IBAT (100mA/div) IBAT=0mA-
VMODE=0V-
100s/div
IBAT=0mA-
100s/div
Mode Reselection High
VVIN=5V, VBAT=3.7V IBAT (100mA/div)
Mode Reselection High
VVIN=5V, VBAT=3.7V
IBAT (100mA/div) VMODE (2V/div)
VMODE (2V/div) VMODE=0V- VMODE=0V-
IBAT=0mA-
100s/div
IBAT=0mA-
100s/div
Mode Reselection
VVIN=5V, VBAT=3.7V IBAT (100mA/div)
Mode Reselection
VVIN=5V, VBAT=3.7V
VMODE (2V/div) VMODE=0V-
VMODE (2V/div) VMODE=0V- IBAT (100mA/div)
IBAT=0mA-
100s/div
IBAT=0mA-
100s/div
2008 Semtech Corporation
SC811 SC813
Descriptions
Name
Function
Supply connect charging adapter (wall adapter USB). This protected against damage high voltage 30V. Charging mode selection (tri-level logical) input Logical high selects high power mode, floating selects power mode, ground selects adapter mode. Status output This open-drain asserted (pulled low) when valid charging supply connected pin, charging cycle begins. released when termination current reached, indicating that charging complete. STATB asserted re-charge cycles. Ground Fast-charge pre-charge current programming mode charging source high power mode (100%) power mode (20%) fast-charge current programmed connecting resistor from this ground. power mode pre-charge current equal power mode fast-charge current (20% high power mode fast-charge current). Adapter mode fast-charge, adapter high power modes pre-charge, modes termination current programming Connect resistor from this ground. Pre-charge current IPRGM-programmed adapter mode fast-charge current when adapter mode high power mode. charging termination current threshold (for adapter either mode selection) IPRGM programmed fast-charge current. Charger output connect battery positive terminal. Combined device enable/disable Logic high disables device. enable charging with indefinite float-charging. Float this enable charging without float-charge upon termination. Note that this must grounded SC811/3 operated without battery connected BAT. heatsinking purposes connected internally. Connect exposed ground plane using multiple vias.
MODE
STATB
IPUSB
IPRGM
Thermal
2008 Semtech Corporation
SC811 SC813
Block Diagram
V_Adapter V_USB
MODE
Tri-level Control VTMODE_HIGH ~1.50V VTMODE_LOW ~0.55
Mode Selection Logic Ad/USB select
(USB only) Regulated System Supply
VVUSB_UV_LIM 4.575V
Connect regulated supply
4.2V
System Load
VIREF LithiumIon Single Cell Battery Pack
Temperature VT_CT Thermal Limiting
Feedback Selection
STATB
Precharg, CC/CV Termination Controller, Logical State Machine
Termination VTIPRGM_TERM VTENB_HIGH ~1.50V
Tri-level Control
VTENB_LOW ~0.55
IPUSB
IPRGM
RIPUSB
RIPRGM
2008 Semtech Corporation
SC811 SC813
Applications Information
Charger Operation
SC811/3 single input tri-mode stand-alone Li-ion battery charger. (The SC811 differs from SC813 only input voltage Over Voltage Protection threshold.) provides selections adapter mode high power mode charging. device independently programmed battery capacity dependent currents (adapter fast-charge current termination current) using IPRGM pin. Charging currents from Vbus supply, which maximum load specification, programmed using IPUSB when either modes selected. When input supply first detected, charge cycle initiated STATB open-drain output goes low. battery voltage less than pre-charge threshold voltage, pre-charge current supplied. Pre-charge current IPRGM (adapter high power modes) IPUSB (USB power mode) programmed fast-charge current. When battery voltage exceeds pre-charge threshold, typically within seconds standard battery with starting cell voltage greater than fast-charge Constant Current (CC) mode begins. charge current soft-starts three steps (20%, 60%, 100% programmed fast-charge current) reduce adapter load transients. current programmed IPRGM resistance ground when adapter mode selected IPUSB resistance ground when either mode selected. power mode, current held IPUSB programmed fast-charge current. charger begins Constant Voltage (CV) regulation when battery voltage rises fully-charged singlecell Li-ion regulation voltage (VCV nominally 4.2V. regulation, output voltage regulated, battery charges, charge current gradually decreases. STATB output goes high when IBAT drops below termination threshold current, which IPRGM programmed fast-charge current regardless mode selected. This known charge termination. output. output turned upon termination, device enters monitor state. this state, output remains until voltage decreases recharge threshold (VTReQ). re-charge cycle then begins automatically process repeats. forced recharge cycle also periodically commanded processor keep battery topped-off without floatcharging. Monitor State section details. Re-charge cycles indicated STATB pin.
Charging Input Mode Dependencies
UVLO rising falling thresholds adjusted with charging mode selected. adapter mode, charging current loads adapter beyond current limit, input voltage will pulled down just above battery voltage. adapter mode UVLO falling threshold close battery voltage pre-charge threshold permit low-dissipation charging from current limited adapter. modes provide higher UVLO falling threshold applicable specification. modes also provide Under-Voltage Load Regulation (UVLR), which charging current reduced needed prevent overloading Vbus supply. UVLR serve low-cost alternative directly programming power charge current. This beneficial charging small batteries, which high power fast-charge current must programmed less than 500mA. fixed power mode fast-charge current would less than 100mA and, therefore, unsuitable minimum charge-time applications. UVLR also used where there signal available indicate whether high power mode should selected. modes same input Over-Voltage Protection (OVP) threshold defined Electrical Characteristics section device being used.
Constant Current Mode Fast-charge Current Programming
Constant Current (CC) regulation active when battery voltage above VTPreQ less than VCV. When adapter mode selected, programmed regulation fast-charge (FQ) current inversely proportional
Optional Float-charging Monitoring
Depending state input, upon termination SC811/3 either operates indefinitely voltage regulator (known float-charging) turns
2008 Semtech Corporation
SC811 SC813
Applications Information (continued)
resistance between IPRGM according equation Each figure shows nominal fast-charge current versus nominal RIPRGM RIPUSB resistance center plot, theoretical limit plots indicating maximum minimum current versus nominal programming resistance. These plots derived from models expected worst-case contribution error sources depending programmed current. current range includes uncertainty tolerance resistors. dots each plot indicate currents obtained with standard value tolerance resistors. Figures show high resistance ranges, respectively. power mode fast-charge current accuracy exactly like that pre-charge high power mode. power mode current regulation accuracy addressed next section.
When either modes selected, programmed regulation fast-charge current inversely proportional resistance between IPUSB according equation
fast-charge current programmed minimum 70mA maximum 995mA either adapter high power mode. This range both modes permits high power mode general purpose adapter charging, allowing fully independent programming termination current. (See application sections, Independent Programming Termination Current, USB-only Charging Very Large Batteries.) Current regulation accuracy dominated gain error high current settings, offset error current settings. range expected fast-charge output current versus programming resistance RIPRGM RIPUSB (for adapter high power mode, respectively) shown Figures
Pre-charge Power Mode Fastcharge Current Regulation
Pre-charging automatically selected when battery voltage below pre-charge threshold voltage (VTPreQ), typically 2.8V. Pre-charge current conditions battery fast charging. pre-charge current value fixed nominally fast-charge current. programmed resistance between IPRGM adapter mode high power mode, resistance between IPUSB power mode. Note that power mode pre-charge current equal power mode fast-charge current.
1100 1050 1000
Fast-charge Current (mA)
Fast-charge Current (mA)
RIPRGM RIPUSB (k), R-tol
RIPRGM RIPUSB (k), R-tol
Figure Fast-charge Current Tolerance versus Programming Resistance, Resistance Range
Figure Fast-charge Current Tolerance versus Programming Resistance, High Resistance Range
2008 Semtech Corporation
SC811 SC813
Applications Information (continued)
Pre-charge Current (mA)
Pre-charge Current (mA)
RIPRGM RIPUSB (k), R-tol
RIPRGM RIPUSB (k), R-tol
Figure Pre-charge Current Power Mode Fast-charge Current Tolerance Programming Resistance, Resistance Range Pre-charge current regulation accuracy dominated offset error. range expected pre-charge output current versus programming resistance RIPRGM RIPUSB shown Figures Each figure shows nominal pre-charge current versus nominal RIPRGM RIPUSB resistance center plot theoretical limit plots indicating maximum minimum current versus nominal programming resistance. These plots derived from models expected worst-case contribution error sources depending programmed current. current range includes uncertainty tolerance resistors. dots each plot indicate currents obtained with standard value tolerance resistors. Figures show high resistance ranges, respectively.
Figure Pre-charge Current Power Mode Fast-charge Current Tolerance Programming Resistance, High Resistance Range termination threshold current fixed adapter mode fast-charge current, programmed resistance between IPRGM GND, charging modes. only modes will used, termination threshold current programmed independently fast-charge current. (See application sections, Independent Programming Termination Current, USB-only Charging Very Large Batteries.) Charger output current battery charge current system load current. Battery charge current changes gradually, establishes slowly diminishing lower bound output current while charging mode. load current into typical digital system highly transient nature. Charge cycle termination detected when battery charging current greatest load current occurring within immediate 300s 550s past interval less than programmed termination current. This timing behavior permits charge cycle termination occur during brief low-load-current interval, does require that longer interval average load current small. Termination threshold current accuracy dominated offset error. range expected termination current versus programming resistance RIPRGM (for charging mode) shown Figures Each figure shows
Termination
When battery voltage reaches VCV, SC811/3 transitions from constant current regulation constant voltage regulation. While VBAT regulated VCV, current into battery decreases battery becomes fully charged. When output current drops below termination threshold current, charging terminates. Upon termination, STATB open drain output turns charger either enters monitor state floatcharges battery, depending logical state input pin.
2008 Semtech Corporation
SC811 SC813
Applications Information (continued)
Termination Current Threshold (mA)
Termination Current Threshold (mA)
RIPRGM (k), R-tol
RIPRGM (k), R-tol
Figure Termination Current Tolerance Programming Resistance, Resistance Range nominal termination current versus nominal RIPRGM resistance center plot theoretical limit plots indicating maximum minimum current nominal programming resistance. These plots derived from models expected worst-case contribution error sources depending programmed current. current range includes uncertainty tolerance resistor. dots each plot indicate currents obtained with standard value tolerance resistors. Figures show high resistance ranges, respectively.
Figure Termination Current Tolerance Programming Resistance, High Resistance Range input will float range whenever external driver sinks sources less than common worstcase characteristic high impedance GPIO, weak pull-up pull-down GPIO, configured input. driving GPIO must able sink source least ensure high state, respectively, although drive current typically less. (See Electrical Characteristics table.)
Mode Input
MODE tri-level logical input. When driven high (VMODE VIH), SC811/3 will operate High Power mode. MODE input voltage within specified range (Min VENB VIM), either floating reconfiguring GPIO input) being externally forced, SC811/3 will operate Power mode. When driven (VMODE VIL), SC811/3 will operate adapter mode. When there charging source present, when charger disabled, when operating monitor state (described later section), MODE enters high impedance state, suspending tri-level functionality. Upon re-charge re-enabling charger, MODE tri-level interface reactivated. Typically processor GPIO port direction defaults input upon processor reset, high impedance when unpowered. This ideal initial condition driving MODE pin, since this will select Power mode,
Tri-level Logical Input Pins
MODE pins tri-level logical inputs. They designed interface processor GPIO port that powered from peripheral supply voltage 1.8V high fully charged battery. While connected GPIO port configured output, processor writes select MODE low-range, select highrange. GPIO port configured input select mid-range. These pins also permanently grounded select low-range left unconnected select mid-range fixed mode operation. MODE also permanently connected logical high voltage source, such regulated peripheral supply voltage. equivalent circuit looking into these pins variable resistance, minimum 15k, approximately source.
2008 Semtech Corporation
SC811 SC813
Applications Information (continued)
which safest default mode with lowest fastcharge current. Note that GPIO with weak pull-up input configuration used, pull-up current will flow from GPIO into while floating mid-range. Since GPIO driving equivalent voltage source through resistance (looking into ENB), this current small possibly less than Nevertheless, this current drawn from GPIO peripheral power supply and, therefore, from battery after termination. (See next section, Monitor State.) this reason, preferable that GPIO chosen operate should provide true high impedance (CMOS) configuration weak pulldown when configured input. When pulled below float voltage, output current sourced from VIN, from battery.
Enable Input
tri-level logical input that allows selection following behaviors:
charging enabled with float-charging after termination (ENB range) charging enabled with float-charging disabled battery monitoring termination (ENB range) charging disabled (ENB high range).
input voltage permitted float mid-range, charger enabled will turn output following charge termination will enter monitor state. This state explained next section. Mid-range selected either floating input (sourcing sinking less than being externally forced such that VENB falls within midrange limits specified Electrical Characteristics table. When driven (VENB VIL), charger enabled will continue float-charge battery following termination. charger already monitor state following previous termination, will exit monitor state begin float-charging. When driven high (VENB VIH), charger disabled input enters high impedance state, suspending tri-level functionality. specified high level input current required only until high level recognized SC811/3 internal logic. trilevel float circuitry then disabled input becomes high impedance. Once forced high, will float range. restore tri-level operation, must first pulled down range least VENB VIM), then, desired, released reconfiguring GPIO input) select mid-range. GPIO weak pull-down when configured input, then unnecessary drive restore tri-level operation; simply configure GPIO input. When selection changes from high-range midor low-range, charge cycle begins STATB goes low.
Monitor State
floating, charger output STATB will turn device will enter monitor state when charge cycle complete. battery voltage falls below re-charge threshold (VCV VReQ) while monitor state, charger will automatically initiate recharge cycle. battery leakage current during monitor state more than over temperature typically less than 0.1A room temperature. While monitor state, tri-level input remains fully active, although midrange, sensitive both high levels. SC811/3 forced from monitor state float-charging) directly floatcharging operation driving low. This operation will turn charger output, will assert STATB output. again allowed float midrange, charger will remain only until output current becomes less than termination current, charging terminates. SC811/3 turns charging output returns monitor state within millisecond. This forced re-charge behavior useful periodically testing battery state-of-charge topping-off battery, without float-charging without requiring battery discharge automatic re-charge voltage. should held least ensure successful forced re-charge. Forced re-charge requested time during charge cycle, even with charging source present, with detrimental effect charger operation. This allows host processor schedule forced re-charge
2008 Semtech Corporation
SC811 SC813
Applications Information (continued)
desired interval, without regard whether charge cycle already progress, even whether charging source present. Forced re-charge will neither assert release STATB output. SC811/3, logical transition implemented from recover charge current lost soft transition. controller regulates only current until output voltage exceeds transition threshold voltage. then switches regulation. transition voltage from regulation typically higher than regulation voltage, which provides sharp clean transition free chatter between regulation modes. difference between transition voltage regulation voltage termed CC/CV overshoot. While regulation, output current sense remains active. output current exceeds mode-dependent programmed fast-charge current, controller reverts current regulation. logical transition from results fastest possible charging cycle that compliant with specified current voltage limits Li-ion cell. output current constant limit, then decreases abruptly when output voltage steps from overshoot voltage regulation voltage transition control.
Status Output
STATB open-drain output. asserted (driven low) charging begins after valid charging input applied voltage greater than UVLO level less than level selected mode. STATB also asserted charging begins after input returns either enable voltage ranges (mid voltage) from disable (high voltage) range. STATB subsequently released when termination current reached indicate end-of-charge, when input driven high disable charging, when input voltage removed. battery already fully charged when charge cycle initiated, STATB asserted, will remain asserted approximately 750s before being released. STATB asserted automatic re-charge cycles. STATB connected interrupt input notify host controller charging status used driver.
Thermal Limiting
Device thermal limiting third output constraint Constant Current, Constant Voltage, "Constant" Temperature (CC/CV/CT) control. This feature permits higher input threshold, thus higher voltage poorly regulated adapters. high input voltage results excessive power dissipation, output current reduced prevent overheating SC811/3. thermal limiting controller reduces output current junction temperature When thermal limiting inactive, where voltage difference between pin. However, computed this exceeds then thermal limiting will become active thermal limiting regulation junction temperature will TJTL I(TJTL) where I(TJTL) (TJTL TL).
Logical CC-to-CV Transition
SC811/3 differs from monolithic linear single cell Liion chargers that implement linear transition from regulation. linear transition method uses simultaneous feedback signals output voltage output current closed-loop controller. When output voltage sufficiently below regulation voltage, influence voltage feedback negligible output current regulated desired current. battery voltage approaches regulation voltage (4.2V), voltage feedback signal begins influence control loop, which causes output current decrease although output voltage reached 4.2V. output voltage limit dominates controller when battery reaches 4.2V eventually controller entirely regulation. soft transition effectively reduces charge current below that which permitted portion charge cycle, which increases charge time.
2008 Semtech Corporation
SC811 SC813
Applications Information (continued)
Combining these equations solving TJTL, steady state junction temperature during active thermal limiting
TJTL
charge current. SC811/3 should operated with adapter voltage below rising selection threshold (VTADUVLO-R) only input voltage result adapter current limiting. This implies that voltage first exceeds VTADUVLO-R begin charging subsequently pulled down just above battery voltage charging load. Interaction Thermal Limiting Current Limited Adapter Charging permit charge current limited adapter, necessary that adapter mode fast-charge current programmed greater than maximum adapter current, (IAD-LIM). this configuration, regulator will operate with pass device fully saturation, also called "dropout"). voltage drop from determined product minimum RDS-ON pass device multiplied adapter supply current. dropout, power dissipation SC811/3 PILIM (minimum RDS-ON) (IAD-LIM)2. Since minimum RDS-ON does vary with battery voltage, dropout power dissipation constant throughout portion charge cycle while adapter remains current limit. SC811/3 junction temperature will rise above ambient PILIM device temperature rises temperature which thermal limiting control loop limits charging current (rather than current being limited adapter), input voltage will rise adapter regulation voltage. power dissipation will increase that thermal limit regulation will further limit charge current. This will keep adapter voltage regulation remainder charge cycle. ensure that adapter remains current limit, internal device temperature must never rise This implies that must kept small enough ensure that (PILIM
Although thermal limiting controller able reduce output current zero, this does happen practice. Output current reduced I(TJTL), reducing power dissipation such that temperature equilibrium TJTL reached. While thermal limiting active, charger functions remain active charger logical state preserved.
Operating Charging Adapter Current Limit
high charging current applications, charger power dissipation greatly reduced operating charging adapter current limit. SC811/3 adapter mode supports adapter-current-limited charging with UVLO falling threshold with internal circuitry designed input voltage operation. operate adapter current limit, RIPRGM chosen such that adapter input programmed fast-charge current IFQ_AD exceeds current limit charging adapter IAD-LIM. Note that IAD-LIM less than IFQ_AD, then adapter voltage pulled down battery voltage while battery voltage below pre-charge threshold. this case, care must taken ensure that adapter will maintain current limit below IFQ_AD least until battery voltage exceeds pre-charge threshold. Failure could permit charge current exceed pre-charge current while battery voltage below pre-charge threshold. This because input voltage will also compress pre-charge threshold internal reference voltage below battery voltage. This will prematurely advance charger logic from precharge current regulation fast-charge regulation, charge current will exceed safe level recommended pre-charge conditioning. UVLO falling threshold (VTADUVLO-F) permits adapter voltage pulled down just above battery voltage charging load whenever adapter current limit less than programmed fast-
Under-Voltage Load Regulation Modes
UVLR either mode prevents battery charging current from overloading Vbus network, regardless programmed fast-charge value. When High Power Power mode selected, SC811/3 monitors input voltage (VVIN) reduces charge current necessary keep VVIN above UVLR limit (VUVLR). UVLR operates like fourth output con18
2008 Semtech Corporation
SC811 SC813
Applications Information (continued)
straint (along with constraints), active only when modes selected. either modes, voltage externally pulled below VUVLR, UVLR feature will reduce charging current zero. This condition will interpreted termination will result end-of-charge indication. STATB will remain asserted charging continuing. This behavior prevents repetitive indications end-of-charge alternating with start-of-charge case that external load removed intermittent. threshold SC811 been relatively high permit poorly regulated adapters. Such adapters output high voltage until loaded charger. too-low threshold could prevent charger from ever turning loading adapter lower voltage. adapter voltage remains high despite charging load, fast thermal limiting feature will immediately reduce charging current prevent overheating SC811. This behavior illustrated Figure which 3.0V, 700mA, stepped from 8.1V. Initially, power dissipation SC811 3.6W.
VVIN=8.1V, VBAT=3.0V IBAT=700mA (Initially), PDISSIPATION=3.6W (Initially) IBAT (100mA/div)
High Power Power Support
specification restricts load Vbus power network 100mA power devices high power devices prior granting permission high power operation. specification restricts Vbus load 500mA high power devices after granting permission operate high power device. fixed ratio power high power charging current desirable charging batteries with maximum fast-charge current least 500mA. this application, SC811/3 provides fixed current ratio low-to-high power mode support, tri-level MODE input pin. batteries with maximum fast-charge current less than 500mA, fixed low/high power charge current ratio will result suboptimal charging power mode. example, 250mAh battery will typically require fast-charge current 250mA less. fixed ratio low-to-high power charging current will unnecessarily reduce charging current 50mA, well below 100mA permitted. this case, preferable program low-power fast-charge current switching external programming resistor. section Design Considerations Small Battery.
VVIN (2V/div)
VBAT (2V/div)
VVIN ,VBAT=0V- IBAT=0mA- 1s/div
Figure SC811 Thermal Limiting Example Notice output current rapidly reduced limit internal temperature, then continues decline circuit board gradually heats further reducing conduction heat from ambient environment. fast thermal limiting feature ensures compliance with CCSA YD/T 1591-2006, Telecommunication Industrial Standard People's Republic China Technical Requirements Test Method Charger Interface Mobile Telecommunication Terminal, Section 4.2.3.1. Alternatively, SC813 offered users want limit guaranteed maximum SC811 SC813 alike except threshold.
Input Over-Voltage Protection
protected from over-voltage least above GND. When input voltage exceeds OverVoltage Protection (OVP) rising threshold VTOVP-R charging halted. When input voltage falls below falling threshold (VTOVP-F), charging restarts. fault turns STATB output. STATB turned again when charging restarts.
Short Circuit Protection
SC811/3 tolerate short circuit ground indefinitely. current into ground short approximately 10mA.
2008 Semtech Corporation
SC811 SC813
Applications Information (continued)
During charging, short ground applied active current programming (IPRGM IPUSB) detected, while short ground inactive programming ignored. Pin-short detection active current programming forces SC811/3 into reset, turning output. pin-short either programming will prevent startup regardless mode selected. When IPRGM IPUSB pin-short condition removed, charger begins normal operation automatically without input power cycling.
Attaching part larger copper footprint will enable better heat transfer from device, especially PCBs with internal ground power planes.
Design Considerations Large Battery
battery with desired fast-charge current exceeding 500mA most consistent with fixed current ratio low-to-high power model operation. example, consider 800mAh battery, with maximum fast-charge current 800mA. adapter input fast-charge should configured 800mA (RIPRGM 2.80k). Select IPUSB 4.53k high power fast-charge 450mA, power fast-charge 450/5 90mA. MODE tri-level logical input used select between high power power modes whenever fixed current ratio desired.
Over-Current Protection
Over-current protection provided modes operation, including regulation. output current limited either programmed pre-charge current limit value fast-charge current limit value, depending voltage output.
Operation Without Battery
SC811/3 operated 4.2V regulator without battery present, example, factory testing. this anticipated, output capacitance should least 2.2F ensure stability. operate charger without battery, must driven grounded.
Design Considerations Small Battery
battery with desired fast-charge current less than 500mA will charged minimum charge time when power mode operation with low-tohigh power mode current ratio. 300mAh battery used example with maximum fast-charge current 300mA. this example, adapter input input high power fast-charge currents should both 300mA. power fast-charge current example, 90mA, low-to-high power current ratio 1:3.3, would provide shorter charge time than 60mA obtained with fixed low-to-high power charging current ratio 1:5. arbitrary ratio low-to-high power charging currents obtained using external n-channel operated with processor GPIO signal engage second parallel IPUSB resistor, while selecting high power mode (MODE driven high) both high power charging. external circuit illustrated Figure
IPUSB RIPUSB_HI Hi/Lo Power Select RIPUSB
Capacitor Selection
cost, ceramic capacitors such dielectric material types recommended. capacitor range 22F. capacitor typically between 0.1F 2.2F, although larger values will degrade performance. Capacitance must evaluated expected bias voltage, rather than zero-volt capacitance rating.
Layout Considerations
Layout linear devices critical switching regulator. However, careful attention detail will ensure reliable operation.
Place input output capacitors close device optimal transient response device behavior. Connect ground connections directly ground plane. there ground plane, connect common local ground point before connecting board ground near pin.
Figure External programming arbitrary high power power charge currents.
2008 Semtech Corporation
SC811 SC813
Applications Information (continued)
power mode charging, external transistor turned off. transistor turned when high power mode desired. effect switched parallel IPUSB resistor reduce effective programming resistance thus raise fast-charge current. open-drain GPIO used directly engage parallel resistor RIPUSB_HI. Care must taken ensure that RDS-ON GPIO considered selection RIPUSB_HI. Also important part-to-part temperature variation GPIO RDS-ON, their contribution High Power charge current tolerance. Note also that IPUSB will pulled briefly high during startup check IPUSB static pinshort ground. small amount current could, potentially, flow from IPUSB into GPIO structure through RIPUSB_HI during this event. While unlikely harm, this effect must also considered. 300mAh battery example used illustrate this system works. adapter mode high power mode fast-charge currents should both 300mA max. input power fast-charge current 100mA max. Refer circuit Figure data Figures IFQ_AD 300mA max, RIPRGM 7.50k. fixed IPUSB resistor RIPUSB 23.2k programs IFQ_USB 100mA power charging. When parallel resistor RIPUSB_HI 11.0k resistor switched equivalent IPUSB resistor 7.50k, IFQ_USB 300mA max.
Independent Programming Termination Current
high power mode fast-charge current limited 1000mA, twice high power load limit, this mode also used general purpose adapter charging. IPRGM resistance ground determines high power mode pre-charge current, termination threshold current modes. adapter mode will used application, RIPRGM selected program only termination threshold current independently fast-charge current, which programmed with RIPUSB. Note that high power mode invokes Under-Voltage Load Regulation, charging with adapter current limit, input voltage pulled down lower than VUVLR.
USB-only Charging Very Large Batteries
SC811/3 support charging very large capacity batteries high using USB-only charging source. IPRGM resistance lower limit 2.05k intended limit fast-charge current while charging adapter mode less than only charging modes will used, then IPRGM resistor chosen This extended programming range allows setting high power mode pre-charge current high 400mA (still below specification limit), charge termination current high 200mA. (Both these currents determined RIPRGM.) Note that with RIPRGM 2.05k, adapter mode should used, this result potentially destructive fast-charge current. high power power fast-charge currents power pre-charge current determined resistance between IPUSB comply with specified current limits, unaffected IPRGM resistor. Termination detection requires that charger regulation. IPRGM-determined termination threshold current higher than power mode fast-charge current, example, then charge termination will occur instant that battery voltage rises VCV. Thus power charging will behave trickle-charging until fully charged, perfectly safe acceptable, although slow, charging scenario.
Power Mode Alternative
Where mode selection signal available, capacity battery where system cost board space make power mode external current programming impractical, power charging supported indirectly. IPUSB resistance selected obtain desired high power charge current. Then, with MODE always configured high power mode, UVLR feature will ensure that charging load will never pull Vbus supply voltage below VUVLR regardless host supply limit. UVLR limit voltage guarantees that voltage Vbus supply will loaded below power voltage specification limit, seen other power devices connected same host hub.
2008 Semtech Corporation
SC811 SC813
Outline Drawing MLPD-UT8
DIMENSIONS MILLIMETERS INCHES .020 0.60 .024 0.50 .000 .002 0.00 0.05 (.006) (0.1524) .007 .010 .012 0.18 0.25 0.30 .075 .079 .083 1.90 2.00 2.10 .061 .067 .071 1.55 1.70 1.80 .075 .079 .083 1.90 2.00 2.10 .026 .031 .035 0.65 0.80 0.90 .020 0.50 .012 .014 .016 0.30 0.35 0.40 .003 0.08 .004 0.10
INDICATOR (LASER MARK)
SEATING PLANE
NOTES: CONTROLLING DIMENSIONS MILLIMETERS (ANGLES DEGREES).
COPLANARITY APPLIES EXPOSED WELL TERMINALS.
2008 Semtech Corporation
SC811 SC813
Land Pattern MLPD-UT8
DIMENSIONS INCHES (.077) .047 .067 .031 .020 .006 .012 .030 .106 MILLIMETERS (1.95) 1.20 1.70 0.80 0.50 0.15 0.30 0.75 2.70
NOTES: CONTROLLING DIMENSIONS MILLIMETERS (ANGLES DEGREES). THIS LAND PATTERN REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES MET. THERMAL VIAS LAND PATTERN EXPOSED SHALL CONNECTED SYSTEM GROUND PLANE. FAILURE COMPROMISE THERMAL AND/OR FUNCTIONAL PERFORMANCE DEVICE.
Contact Information
Semtech Corporation Power Management Products Division Flynn Road, Camarillo, 93012 Phone: (805) 498-2111 Fax: (805) 498-3804 www.semtech.com
2008 Semtech Corporation

Adapter/USB Tri-Mode Single-cell Li-ion Charger POWER MANAGEMENT

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