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MAX8814ETA+
28V Linear Li+ Battery Charger with Smart Autoboot Assistant
MAX881428V Linear Li+ Battery Charger
with Smart Autoboot Assistant
EVALUATION KIT AVAILABLE
General Description
The MAX8814 intelligent, stand-alone constant-current,
constant-voltage (CCCV), thermally regulated linear
charger is designed for charging a single-cell lithium-ion
(Li+) battery.
The MAX8814 controls the charging sequence from the
prequalification state through constant-current fast-
charge and the final constant voltage charge. The IC
achieves high flexibility by providing an adjustable fast-
charge current through an external resistor. It also fea-
tures a booting assistant circuit that distinguishes input
sources and battery connection, and provides an out-
put signal (ABO) for system booting.
The device operates over the extended temperature
range (-40°C to +85°C), and is available in an 8-pin
thermally enhanced 2mm x 2mm TDFN package
(0.8mm max height).
Applications
Smartphones
Portable Music Players
Digital Still Cameras
USB Appliances
Charging Cradles and Docks
Bluetooth®Equipment
Benefits and FeaturesReduces External Components and Total CostIntegrated Current-Sensing Circuit, MOSFET Pass
Element, and Thermally Regulation CircuitryNo Reverse Blocking Diode RequiredGuarantees Safe and Accurate Battery ChargingProprietary Die Temperature Regulation Control
(+115°C) Allows Maximum Charging Current
Without Damaging the IC4.25V to 28V Input Voltage Range with Over-
Voltage Protection Above +7V to Protect Against
Unqualified or Faulty AC AdaptersSoft-Start Limits Inrush CurrentIntegrated System Features for Compact DesignsProgrammable Fast-Charge Current: 1ARMSMaxCharge-Current Monitor for Fuel Gauging (ISET)Input Power-Source Detection Output (POK) and
Charge-Enable Input (EN)Output for Autobooting (ABO)Reduce Power DissipationLow Dropout Voltage (300mV at 500mA)
Ordering Information
ABI
ISET
GNDABO
BATT
OFF
POK
SYSTEM
SUPPLY
2.2µFLi+
4.25V TO 28V
MAX8814
Typical Operating Circuit
PARTTEMP RANGEPIN-PACKAGETOP
MARK
MAX8814ETA+-40°C to +85°C8 TDFN
(2mm x 2mm)ABI
Bluetooth is a registered trademark of Bluetooth SIG.
+Denotes a lead-free and RoHS-compliant package.
MAX881428V Linear Li+ Battery Charger
with Smart Autoboot Assistant
Absolute Maximum Ratings
Electrical Characteristics
(VIN= 5V, VBATT= 4V, RPOK= 1MΩto BATT, EN= 0V, RISET= 2.8kΩto GND, CBATT= 2.2µF, TA= -40°C to +85°C, unless other-
wise noted. Typical values are at TA= +25°C.) (Note 1)
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 +30V
ABI, BATT, EN, POKto GND....................................-0.3V to +6V
ABO to GND............................................-0.3V to (VBATT+ 0.3V)
ISET to GND.............................................................-0.3V to +4V
IN to BATT Continuous Current.........................................1ARMS
Continuous Power Dissipation (TA= +70°C)
8-Pin TDFN (derate 11.9mW/°C above +70°C)
(multilayer PCB)........................................................953.5mW
BATT Short-Circuit Duration.......................................Continuous
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERCONDITIONSMINTYPMAXUNITS
Input Voltage Range028V
Input Operating Voltage Range4.256.80V
VIN rising40Power-OK ThresholdVIN - VBATT,
10mV hysteresis (typ)VIN falling30mV
Overvoltage-Lockout Trip
ThresholdVIN rising, 100mV hysteresis (typ)6.877.5V
Constant-current charging mode (IBATT = 0A)0.81.35
IC disabled (VEN = 5V)0.230.50
TA = +25°C0.0210.065IN Input Current
VIN = 4V,
VBATT = 4.2VTA = +85°C0.021
VIN = 0 to 4V,
VBATT = 4.2V110BATT Input Current
IC disabled3
TA = 0°C to +85°C4.1794.2004.221Battery Regulation VoltageIBATT = 0ATA = -40°C to +85°C4.1584.2004.242V
Minimum BATT Bypass
Capacitance2.2µF
TA = 0°C to +85°C524570616VBATT = 3.5VTA = -40°C to +85°C485570656
TA = 0°C to +85°C89107125Fast-Charge Current
VBATT = 3.5V,
RISET = 14kΩTA = -40°C to +85°C80107134
Prequalification Charge CurrentPercentage of the fast-charge current, VBATT = 2.2V,
TA = 0°C to +85°C41015%
Die Temperature Regulation
Threshold+115°C
VBATT Prequalification Threshold
VoltageVBATT rising, 100mV hysteresis (typ)2.32.52.7V
Current-Sense Amplifier GainIBATT = 570mA877.2µA/A
MAX881428V Linear Li+ Battery Charger
with Smart Autoboot Assistant
PARAMETERCONDITIONSMINTYPMAXUNITS
Regulator Dropout Voltage
(VIN - VBATT )VBATT = 4.1V, IBATT = 425mA240500mV
EN Logic-Input Low Voltage4.25V < VIN < 6.5V0.4V
EN Logic-Input High Voltage4.25V < VIN < 6.5V1.3V
EN and ABI Internal Pulldown
Resistance100200400kΩ
ABI Logic-Input Low VoltageVIN = 0V0.4V
ABI Logic-Input High VoltageVIN = 0V1.3V
ABO Output Low VoltageIABO (SINK) = 1mA0.4V
ABO Output High VoltageIABO (SOURCE) = 1mAVBATT -
0.4VV
POK Output Low VoltageI POK = 5mA0.4V
TA = +25°C0.0011POK Output High Leakage
CurrentV POK = 5.5VTA = +85°C0.002µA
Electrical Characteristics (continued)
(VIN= 5V, VBATT= 4V, RPOK= 1MΩto BATT, EN= 0V, RISET= 2.8kΩto GND, CBATT= 2.2µF, TA= -40°C to +85°C, unless other-
Note 1:Specifications are 100% production tested at TA= +25°C. Limits over the operating temperature range are guaranteed by
design and characterization.
SUPPLY CURRENT
vs. VOLTAGE
MAX8814 toc01
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)
EN = 0V
DISABLED MODE SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX8814 toc02
INPUT VOLTAGE (V)
SUPPLY CURRENT (
VEN = 5V
CHARGE CURRENT
vs. BATTERY VOLTAGE
MAX8814 toc03
BATTERY VOLTAGE (V)
CHARGE CURRENT (mA)
Typical Operating Characteristics
(VIN= 5V, VBATT= 4V, RPOK= 1MΩto BATT, EN= 0V, RISET= 2.8kΩto GND, CBATT= 2.2µF, TA= -40°C to +85°C, unless other-
MAX881428V Linear Li+ Battery Charger
with Smart Autoboot Assistant
Package Information (continued)
(VIN= 5V, VBATT= 4V, RPOK= 1MΩto BATT, EN= 0V, RISET= 2.8kΩto GND, CBATT= 2.2µF, TA= -40°C to +85°C, unless other-
wise noted. Typical values are at TA= +25°C.)
CHARGE CURRENT
vs. INPUT VOLTAGE
MAX8814 toc04
INPUT VOLTAGE (V)
CHARGE CURRENT (mA)
CHARGE CURRENT vs. INPUT
VOLTAGE HEADROOM
MAX8814 toc05
VIN - VBATT (mV)
CHARGE CURRENT (mA)
VBATT = 4V
VIN RISING
40μs/div
STARTUP INTO PRECHARGE
100mA/div
MAX8814 toc06
5V/div
5V/div
5V/div
IBATT
VIN
VEN
VPOK
VBATT = 2V
100μs/div
SHUTDOWN
(FAST-CHARGE TO SHUTDOWN)
500mA/div
MAX8814 toc07
5V/div
5V/div
5V/div
IBATT
VIN
VEN
VPOK-1.0
BATTERY REGULATION VOLTAGE
ACCURACY vs. AMBIENT TEMPERATURE
MAX8814 toc08
TEMPERATURE (°C)
BATTERY REGULATION VOLTAGE ACCURACY (%)
IBATT = 0A
CHARGE CURRENT vs. RISET
MAX8814 toc09
RISET (kΩ)
CHARGE CURRENT (mA)
100010,000
CHARGE CURRENT vs. AMBIENT
TEMPERATURE
MAX8814 toc10
CHARGE CURRENT (mA)
RISET = 2.8kΩ
VBATT = 4V
VBATT = 3.2V
4μs/div
AUTOBOOT ENABLED
BY ABI SIGNAL
MAX8814 toc11
5V/div
5V/div
5V/div
5V/div
VABI
VIN
VBATT
VABO
4μs/div
AUTOBOOT ENABLED
BY INPUT SUPPLY
MAX8814 toc12
5V/div
5V/div
5V/div
5V/div
VABI
VIN
VBATT
VABO
MAX881428V Linear Li+ Battery Charger
with Smart Autoboot Assistant
Pin Description
PINNAMEFUNCTION
1INInput Supply Voltage. Bypass IN to GND with a 1µF or larger ceramic capacitor to minimize line noise
and maximize input transient rejection.GNDGround. Connect GND and the exposed paddle to a large copper ground plane for maximum power
dissipation. Connect GND to the exposed paddle directly under the IC.ISET
Charge-Current Program and Fast-Charge Current Monitor. Output current from ISET is 877.2µA per
ampere of battery charging current. Set the charging current by connecting a resistor (R2 in Figure 3)
from ISET to GND. IFAST-CHARGE = 1596V / RISET. To configure the MAX8814 as a USB charger, see
Figure 4.ABIAutobooting External Input. See the Autobooting Assistant section and Table 1 for autobooting
conditions. ABI is pulled to GND through an internal 200kΩ resistor.ABOAutobooting Logic Output. See the Autobooting Assistant section and Table 1 for autobooting
conditions.ENLogic-Level Enable Input. Drive EN high to disable charger. Drive EN low or leave unconnected for
normal operation. EN has an internal 200kΩ pulldown resistor.POK
Input-Voltage Status Indicator. Connect a 1MΩ pullup resistor from POK to an external system supply.
POK is an open-drain output that asserts low when VIN > 4.25V and (VIN - VBATT) ≥ 40mV. If VBATT ≥
(VIN - 40mV), the IC is shut down and POK becomes high impedance.BATTBattery Connection. Bypass BATT to GND with a minimum of 2.2µF of capacitor.
—EPExposed Paddle. Connect the exposed paddle to a large ground plane for maximum power
dissipation. Connect GND to the exposed paddle directly under the IC.
MAX881428V Linear Li+ Battery Charger
with Smart Autoboot Assistant
Detailed Description
The MAX8814 charger uses voltage, current, and ther-
mal-control loops to charge a single Li+ cell and pro-
tect the battery (Figure 1). When a Li+ battery with a
cell voltage below 2.5V is inserted, the MAX8814
charger enters the prequalification stage where it
precharges that cell with 10% of the user-programmed
fast-charge current (Figure 2). When the battery voltage
exceeds 2.5V, the charger soft-starts as it enters the
fast-charge stage. In the MAX8814, the fast-charge
current level is programmed through a resistor from
ISET to GND. As the battery voltage approaches 4.2V,
the charging current is reduced. Once the battery volt-
age reaches 4.2V, the IC then enters a constant voltage
regulation mode to maintain the battery at full charge.
Thermal Regulation
The thermal-regulation loop limits the MAX8814 die
temperature to +115°C by reducing the charge current
as necessary. This feature not only protects the IC from
overheating, but also allows a higher charge current
without risking damage to the IC.
OUTPUT DRIVER,
CURRENT SENSE,
AND LOGICTEMPERATURE
SENSOR
REGULATOR
REF
REFOK
VIN
OVLO
UVLO
VREFVREF
LOGIC
BATT
ISET
ABI
ABO
POK
BATT
BATT
POK200kΩ
GNDEP
+115°C
Li+C3
2.2µF
VI/O
200kΩ
1µF
2.8kΩ
4.25V TO 28V
1MΩ
MAX8814
VREF
Figure 1. Functional Diagram

Partno	Mfg	Dc	Qty	Available	Descript
MAX8814ETA+	MAXIM	N/a	4400	avai	28V Linear Li+ Battery Charger with Smart Autoboot Assistant