MAX8856ETD+T Fast Delivery |IC PHOENIX CO.,LIMITED

MAX8856ETD+T ,USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50mΩ Battery Switch in TDFNApplicationsTypical Operating CircuitCellular Phones, Smartphones, PDAsDigital Cameras, MP3 Players ..
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MAX8856ETD+T
USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50mΩ Battery Switch in TDFN
General Description
The MAX8856 complete 1-cell Li+ battery charge-man-
agement IC operates from either a USB port or AC
adapter. It integrates a battery disconnect switch, cur-
rent-sense circuit, PMOS pass element, and thermal-
regulation circuitry, while eliminating the external
reverse-blocking Schottky diode, to create a simple
and small charging solution. The charging sequence
initiates from power-OK indication, through prequalifi-
cation, fast-charge, top-off charge, and finally charg-
ing-complete indication for single-cell Li+ batteries.
Charging is controlled using constant current, constant
voltage, or constant die-temperature (CCCVCTJ) regu-
lation for safe operation in handhelds.
Two logic inputs (EN1, EN2) select suspend mode,
100mA, 500mA, or ≤1A input current limits to comply
with USB requirements. Proprietary thermal-regulation
circuitry limits the die temperature to +100°C to prevent
excessive heat on the system PC board. Additional
safety features include an NTC thermistor input (THM)
to protect the battery. A 3.5V to 4.2V SYS output, in
conjunction with the low-RDSONbattery switch, powers
the system even when the battery is deeply discharged
or not installed. The IC also offers a +3.3V/500µA out-
put (VL), a charging status flag (CHG), and an input-
supply detection flag (POK). The MAX8856 operates
from a +4.25V to +5.5V supply and includes undervolt-
age lockout below +3.4V and overvoltage protection
up to +14V.
Applications
Cellular Phones, Smartphones, PDAs
Digital Cameras, MP3 Players
USB Appliances, Charging Cradles and Docks
FeaturesSmall, 3mm x 3mm Thermally Enhanced TDFN
Package (0.8mm max height)USB-Compliant Suspend Mode (20µA)Selectable 100mA, 500mA, and Up to 1A Input
Current LimitsUSB or AC Adapter Input+6V to +14V Input Overvoltage ProtectionInput UVLO Below +4V Rising (3.5V Falling)Automatic Current Sharing Between Battery
Charging and SystemDie Temperature Regulation (+100°C) Low Dropout Voltage, 250mV at 0.5ANTC Thermistor InputCharge Status and Input-Supply Detection Flags
MAX8856
USB/AC Adapter, Li+ Linear Battery Charger
with Integrated 50mΩBattery Switch in TDFN2
BAT
BATV
THM
CHG
POK
EN2
GATE
EN1
GND
SETI
SYS
SYS
MA8856
TOP VIEW
TDFN
Pin Configuration
Ordering Information
19-4277; Rev 0; 9/08EVALUATION KIT
AVAILABLE
PARTTEMP RANGEPIN-PACKAGETOP
MARK
MAX8856ETD+-40°C to +85°C14 TDFN 3mm x
3mm (T1433-1)AEJ
GND
EN1
EN2
GATE
POK
CHG
SETI
SYS
USB/AC-ADAPTER
OVP UP TO 14V
3.5V TO 4.2V
INPUT
CURRENT
SELECTION
STATUS
INDICATORS
MAX8856
0.1μF
CONTROL
BAT
THM
Typical Operating Circuit
+Denotes a lead-free/RoHS-compliant package.
MAX8856
USB/AC Adapter, Li+ Linear Battery Charger
with Integrated 50mΩBattery Switch in TDFN
ABSOLUTE MAXIMUM RATINGS
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.
IN to GND..............................................................-0.3V to +16V
BAT, SYS, EN1, EN2, POK, CHG, GATE to GND.....-0.3V to +6V
VL, SETI, THM to GND..............................................-0.3V to +4V
SYS to BAT...............................................................-0.3V to +6Vto IN...................................................................-16V to +0.3V
IN to BAT Current...........................................................1.0ARMS
IN to SYS Current...........................................................1.0ARMS
BAT to SYS Current........................................................1.0ARMS
BAT Short-Circuit Duration.........................................Continuous
Continuous Power Dissipation (TA= +70°C)
14-Pin 3mm x 3mm TDFN (derate 18.2mW/°C
above +70°C)...........................................................1454mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature Range............................-40°C to +150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
ELECTRICAL CHARACTERISTICS
(VIN= 5.0V, VBAT= 3.3V, EN1= EN2= GND, RSETI= 23.58kΩ, CVL= 0.1µF, CSYS= 4.7µF, TA= -40°C to +85°C, unless otherwise
noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITS
IN Voltage Range014V
IN Operating Voltage Range(Note 2)4.255.50V
IN Undervoltage ThresholdVIN rising, 500mV hysteresis (typ)3.94.04.1V
IN Overvoltage ThresholdVIN rising, 150mV hysteresis (typ)5.65.86.0V
Charging, IBAT = ISYS = 0mA1.23.0mAIN Supply CurrentSuspend, EN1 = EN2 = high, IVL = 0mA2040µA
TA = +25°C0.110IN to BAT Switch LeakageVIN = 14V, BAT = GNDTA = +85°C0.5µA
SYS
SYS Regulated VoltageISYS = 0mA, VBAT = 3.3V3.43.53.6V
EN1 = low, EN2 = low9096100
EN1 = low, EN2 = high450475500SYS Current LimitVSYS = 3.3V
EN1 = high, EN2 = low675712750
SYS Dropout Voltage (VIN - VBAT)ISYS = 400mA, VSYS = 3.3V, EN1 = low, EN2 = high350700mV
SYS Load RegulationISYS = 1mA to 675mA, EN1 = high, EN2 = low10mV
BAT
TA = +25°C4.184.204.22BAT Regulation VoltageIBAT = 0mATA = -40°C to +85°C4.164.204.24V
Maximum Charging Current1A
ISYS = 0mA8795100EN1 = low,
EN2 = lowISYS = 50mA45
ISYS = 0mA450475500EN1 = low,
EN2 = highISYS = 250mA225
ISYS = 0mA675712750
BAT Charging Current
EN1 = high,
EN2 = lowISYS = 375mA337
MAX8856MAX8856
USB/AC Adapter, Li+ Linear Battery Charger
with Integrated 50mΩBattery Switch in TDFN
ELECTRICAL CHARACTERISTICS (continued)
(VIN= 5.0V, VBAT= 3.3V, EN1= EN2= GND, RSETI= 23.58kΩ, CVL= 0.1µF, CSYS= 4.7µF, TA= -40°C to +85°C, unless otherwise
noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITS
EN1 = low, EN2 = low, ISYS = 0mA8795100
EN1 = low, EN2 = high, ISYS = 0 to
350mA95BAT Prequal CurrentVBAT = 2.0V
EN1 = high, EN2 = low, ISYS = 0 to
575mA95
Soft-Start Time1.5ms
BAT Prequal ThresholdVBAT rising, 150mV hysteresis (typ)2.93.03.1V
BAT Dropout Voltage (VIN - VBAT)VBAT = 4.1V, IBAT = 400mA200400mV
BAT Short-Circuit Current LimitBAT = GND7095120mA
BAT to SYS Switch RONVBAT = 3.5V, VSYS = 3.4V, VIN = 0V50100mΩ
BAT to SYS Switch ThresholdBAT rising, 160mV hysteresis (typ)3.43.53.6V
Battery-Removal ThresholdBAT rising, 210mV hysteresis (typ)4.54.755.0V
TA = +25°C0.110VIN = 0VTA = +85°C0.1
TA = +25°C0.110VIN = 2.4VTA = +85°C0.1
TA = +25°C-100.1+10
BAT Leakage Current
EN1 = high, EN2 = highTA = +85°C0.1
VL Output VoltageIVL = 0 to 500µA3.13.33.5V
VL Shutdown VoltageV EN1 = V EN2 = 5V0V
THM
THM Threshold, Hot10% hysteresis, VTHM falling21.522.523.5
THM Threshold, Cold10% hysteresis, VTHM rising53.054.055.5
THM Threshold, Disabled70% hysteresis, VTHM falling
Expressed as
percentage of VL
SETI
EN1 = low, EN2 = low0.28
EN1 = low, EN2 = high1.4SETI Servo Voltage
EN1 = high, EN2 = low2.1
SETI Resistance Range17.6823.5835.36kΩ
POK
VIN rising150250350POK Trip Threshold (VIN - VBAT)4.1V < VIN < 5.6V,
VBAT = 4.1VVIN falling555125mV
POK Voltage, LowIPOK = 5mA0.050.2V
TA = +25°C0.011POK Leakage Current, HighV POK = 6VTA = +85°C0.01µA
MAX8856
USB/AC Adapter, Li+ Linear Battery Charger
with Integrated 50mΩBattery Switch in TDFN
ELECTRICAL CHARACTERISTICS (continued)
(VIN= 5.0V, VBAT= 3.3V, EN1= EN2= GND, RSETI= 23.58kΩ, CVL= 0.1µF, CSYS= 4.7µF, TA= -40°C to +85°C, unless otherwise
noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITS
CHG
Full-Battery Detection Current
ThresholdIBAT falling305070mA
CHG Voltage, LowICHG = 5mA0.050.2V
TA = +25°C0.011CHG Leakage Current, HighV CHG = 6VTA = +85°C0.01µA
EN1, EN2, GATE
TA = +25°C0.011Logic Input Leakage CurrentV GATE = V EN1 = V EN2 = 0 to 5.5VTA = +85°C0.01µA
Logic Input Low Voltage0.4V
Logic Input High Voltage1.6V
THERMAL LIMIT
Thermal-Regulation Threshold+100°C
Thermal-Regulation GainTJ to IBAT , TJ > +100°C-50mA/°C
Note 1:Specifications are 100% production tested at TA= +25°C. Limits over the operating temperature range are guaranteed by
design and characterization.
Note 2:Guaranteed by undervoltage and overvoltage threshold testing.
MAX8856MAX8856
SUPPLY CURRENT vs. INPUT VOLTAGE
MAX8856 toc01
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)106842
VBAT = 3.3V
VIN FALLING
VIN RISING
SUSPEND-MODE SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX8856 toc02
INPUT VOLTAGE (V)
SUPPLY CURRENT (106842
EN1 = 1
EN2 = 1
CHARGE CURRENT vs. BATTERY VOLTAGE
MAX8856 toc03
VBAT (V)
CHARGE CURRENT (mA)
CHARGE CURRENT vs. INPUT VOLTAGE
MAX8856 toc04
VIN (V)
CHARGE CURRENT (mA)106842
VIN
FALLING
VIN
RISING
(VIN - VBAT) (mV)
CHARGE CURRENT
vs. INPUT VOLTAGE HEADROOM
MAX8856 toc05
CHARGE CURRENT (mA)
VBAT = 4V
BATTERY REGULATION VOLTAGE
vs. TEMPERATURE
MAX8856 toc06
TA (°C)
BATTERY REGULATION VOLTAGE (V)3510-15
CHARGE CURRENT
vs. AMBIENT TEMPERATURE
MAX8856 toc07
TA (°C)
CHARGE CURRENT (mA)35-1510
EN1 = 0
EN2 = 1
CHARGE CURRENT
vs. AMBIENT TEMPERATURE
MAX8856 toc08
TA (°C)
CHARGE CURRENT (mA)35-1510-4085
VIN = 5.5V
VBAT = 3.2V
EN1 = 1
EN2 = 0
CONSTANT TJ
REGULATION
USB/AC Adapter, Li+ Linear Battery Charger
with Integrated 50mΩBattery Switch in TDFN
Typical Operating Characteristics
(VIN= +5V, VBAT= 3.6V, ISYS= 0, EN1= 1, EN2= 0, circuit of Figure 3, TA= +25°C, unless otherwise noted.)
MAX8856
Detailed Description
The MAX8856 charger uses current, voltage, and ther-
mal control loops to charge and protect a single Li+
battery cell. It can start the system even when the bat-
tery is in deep saturation. The MAX8856 provides a
SYS output that supplies the external system with a
minimum 3.5V at 1A.
Two active-low enable inputs (EN1and EN2) are sup-
plied to set the SYS and charging current limits. During
prequal and fast-charge modes, the CHGoutput status
4.2V, the charging current is reduced. When the charging
current drops below 50mA and the battery voltage equals
4.2V, the CHGoutput goes high impedance, signaling a
full battery. At any time during charging, if both EN1and
EN2are driven high, the MAX8856 enters suspend mode,
charging stops, and CHGgoes high impedance.
EN1and EN2Inputs
EN1and EN2are logic inputs that enable the charger
and select the charging current (see Table1). Drive
EN1and EN2high to place the IC in suspend mode.
USB/AC Adapter, Li+ Linear Battery Charger
with Integrated 50mΩBattery Switch in TDFN
Pin Description
PINNAMEFUNCTION
1, 2BATBatter y C onnecti on. The IC d el i ver s char g i ng cur r ent and m oni tor s b atter y vol tag e usi ng BAT. C onnectoth BAT outp uts tog ether exter nal l y. D ur i ng susp end m od e, BAT i s i nter nal l y connected to S Y S .
3INSupply Voltage Input. Connect IN to a 4.25V to 5.5V supply. Charging is suspended if VIN exceeds 6V.
Bypass IN to GND with a 4.7µF or larger ceramic capacitor.
4VL
+3.3V Output Voltage and Logic Supply. VL is regulated to +3.3V and is capable of sourcing 500µA to
provide power for external circuits. Bypass VL to GND with a 0.1µF or larger ceramic capacitor.
VL is internally pulled to GND during suspend mode.THM
Thermistor Input. Connect a 47kΩ NTC thermistor from THM to GND in close proximity to the battery to
monitor the battery temperature. The IC suspends charging when the temperature is outside the hot
and cold limits. Connect THM to GND to disable the thermistor monitoring function. See the THM Input
section for more details.CHG
Charging Status Output. CHG is an open-drain output that goes low when the battery is charging. CHG
goes high impedance when the charge current drops below 50mA (typ) and the battery voltage is 4.2V
(typ). CHG is high impedance when the IC is in suspend mode.POKP ower - OK M oni tor . P O K i s an op en- d r ai n outp ut that pul l s l ow w hen a val id char g ing sour ce i s d etected at IN .GATE
MOSFET Enable/Disable Input. Drive GATE high to turn off the MOSFET between SYS and BAT,
resulting in opening of the connection between SYS and BAT. Drive GATE low to enable automatic
control of the MOSFET switch, as described in the Gate Input and SYS Output section.EN2Charge-Current Selection Input. Drive EN_ high or low to select the charge current or to put the
MAX8856 into suspend mode (see Table 1).EN1Charge-Current Selection Input. Drive EN_ high or low to select the charge current or to put the
MAX8856 into suspend mode (see Table 1).GNDGround. Connect directly to exposed paddle under the IC.SETICharge-Current Programming Input. Connect a resistor from SETI to GND to set the maximum charging
current. RSETI must be between 17.68kΩ and 35.36kΩ.
13, 14SYS
System Supply Output. SYS delivers up to 1ARMS to power an external system. Bypass SYS to GND
with a 4.7µF or larger ceramic capacitor. SYS is connected to BAT through an internal 50mΩ switch
when VBAT exceeds 3.5V or when the MAX8856 is in suspend mode.
—EPExposed Paddle. Connect to GND under the IC. Connect to a large ground plane to improve power
dissipation.
MAX8856
USB/AC Adapter, Li+ Linear Battery Charger
with Integrated 50mΩBattery Switch in TDFN
MAX8856MAX8856
ANY STATE
ANY CHARGING STATE
VIN < 4V OR
VIN > 5.8V OR
VIN < VBAT
4V < VIN < 5.8V AND
VIN > VBAT AND
EN1 = EN2 = 1
4V < VIN < 5.8V AND
VIN > VBAT AND
EN1 OR EN2 = 0EN1 OR EN2 = 0
NOT READY
POK = Hi-Z, CHG = Hi-Z,
IIN = 0mA
PREQUAL
POK = 0V, CHG = 0,
IBAT = 100mA
IIN ≤ ILIM
SUSPEND
POK = 0, CHG = Hi-Z,
IIN < 40μA
ILIM = 100mA,
500mA, OR UP TO 1A
VBAT < 2.9VVBAT > 3V
VBAT < 4.06V
FAST-CHARGE
POK = 0, CHG = 0,
VIN(MAX) = 4.2V,
IIN(MAX) = ILIM
TOP-OFF
POK = 0, CHG = Hi-Z,
VIN(MAX) = 4.2V,
IIN(MAX) = ILIM
DONE
POK = 0, CHG = Hi-Z,
IIN = 0A
ITOTAL < 50mA
AND VBAT = 4.2V,
0.225 X VL < VTHM
< 0.542 X VL
0.03 X VL < VTHM
< 0.225 X VL OR
VTHM > 0.542 X VL
TEMPERATURE SUSPEND
IBAT = 0A
POK = PREVIOUS STATE
Figure 1. MAX8856 State Diagram

Partno	Mfg	Dc	Qty	Available	Descript
MAX8856ETD+T	MAIXM	N/a	2500	avai	USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50mΩ Battery Switch in TDFN