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MAX8814
EVALUATION KIT AVAILABLE
28V Linear Li+ Battery Charger
with Smart Autoboot Assistant
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 Features
Reduces External Components and Total Cost
Integrated Current-Sensing Circuit, MOSFET Pass
Element, and Thermally Regulation Circuitry
No Reverse Blocking Diode Required
Guarantees Safe and Accurate Battery Charging
Proprietary Die Temperature Regulation Control
(+115°C) Allows Maximum Charging Current
Without Damaging the IC
4.25V to 28V Input Voltage Range with Over-
Voltage Protection Above +7V to Protect Against
Unqualified or Faulty AC Adapters
Soft-Start Limits Inrush Current
Integrated System Features for Compact Designs
Programmable Fast-Charge Current: 1ARMS Max
Charge-Current Monitor for Fuel Gauging (ISET)
Input Power-Source Detection Output (POK) and
Charge-Enable Input (EN)
Output for Autobooting (ABO)
Reduce Power Dissipation
Low Dropout Voltage (300mV at 500mA)
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX8814ETA+
-40°C to +85°C
8 TDFN
(2mm x 2mm)
+Denotes a lead-free and RoHS-compliant package.
TOP
MARK
ABI
Typical Operating Circuit
Bluetooth is a registered trademark of Bluetooth SIG.
Pin Configuration appears at end of data sheet.
4.25V TO 28V
IN
BATT
OFF
ON
MAX8814
EN
ABI
ISET
GND
POK
EP ABO
+
2.2µF
Li+
SYSTEM
SUPPLY
19-0994; Rev 3; 5/15

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MAX8814
28V Linear Li+ Battery Charger
with Smart Autoboot Assistant
Absolute Maximum Ratings
IN to GND ...............................................................-0.3V to +30V
ABI, BATT, EN, POK to 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
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
(VIN = 5V, VBATT = 4V, RPOK = 1MΩ to BATT, EN = 0V, RISET = 2.8kΩ to GND, CBATT = 2.2µF, TA = -40°C to +85°C, unless other-
wise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input Voltage Range
0 28 V
Input Operating Voltage Range
4.25 6.80 V
Power-OK Threshold
VIN - VBATT,
10mV hysteresis (typ)
VIN rising
VIN falling
40
mV
30
Overvoltage-Lockout Trip
Threshold
VIN rising, 100mV hysteresis (typ)
6.8 7 7.5 V
IN Input Current
Constant-current charging mode (IBATT = 0A)
IC disabled (VEN = 5V)
VIN = 4V,
VBATT = 4.2V
TA = +25°C
TA = +85°C
0.8
0.23
0.021
0.021
1.35
0.50
0.065
mA
BATT Input Current
VIN = 0 to 4V,
VBATT = 4.2V
1 10
µA
IC disabled
3
Battery Regulation Voltage
IBATT = 0A
TA = 0°C to +85°C
TA = -40°C to +85°C
4.179 4.200 4.221
4.158 4.200 4.242
V
Minimum BATT Bypass
Capacitance
2.2 µF
Fast-Charge Current
VBATT = 3.5V
VBATT = 3.5V,
RISET = 14kΩ
TA = 0°C to +85°C
TA = -40°C to +85°C
TA = 0°C to +85°C
TA = -40°C to +85°C
524 570 616
485 570 656
89 107 125
80 107 134
mA
Prequalification Charge Current
Percentage of the fast-charge current, VBATT = 2.2V,
TA = 0°C to +85°C
4 10 15 %
Die Temperature Regulation
Threshold
+115
°C
VBATT Prequalification Threshold
Voltage
VBATT rising, 100mV hysteresis (typ)
2.3 2.5 2.7
V
Current-Sense Amplifier Gain
(IBATT to IISET)
IBATT = 570mA
877.2
µA/A
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MAX8814
28V Linear Li+ Battery Charger
with Smart Autoboot Assistant
Electrical Characteristics (continued)
(VIN = 5V, VBATT = 4V, RPOK = 1MΩ to BATT, EN = 0V, RISET = 2.8kΩ to GND, CBATT = 2.2µF, TA = -40°C to +85°C, unless other-
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Regulator Dropout Voltage
(VIN - VBATT )
EN Logic-Input Low Voltage
EN Logic-Input High Voltage
EN and ABI Internal Pulldown
Resistance
VBATT = 4.1V, IBATT = 425mA
4.25V < VIN < 6.5V
4.25V < VIN < 6.5V
240 500
0.4
1.3
100 200 400
mV
V
V
kΩ
ABI Logic-Input Low Voltage
ABI Logic-Input High Voltage
ABO Output Low Voltage
VIN = 0V
VIN = 0V
IABO (SINK) = 1mA
0.4 V
1.3 V
0.4 V
ABO Output High Voltage
POK Output Low Voltage
POK Output High Leakage
Current
IABO (SOURCE) = 1mA
IPOK = 5mA
VPOK = 5.5V
TA = +25°C
TA = +85°C
VBATT -
0.4V
0.001
0.002
0.4
1
V
V
µA
Note 1: Specifications are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by
design and characterization.
Typical Operating Characteristics
(VIN = 5V, VBATT = 4V, RPOK = 1MΩ to BATT, EN = 0V, RISET = 2.8kΩ to GND, CBATT = 2.2µF, TA = -40°C to +85°C, unless other-
SUPPLY CURRENT
vs. VOLTAGE
1.0
EN = 0V
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0 4 8 12 16 20 24 28
INPUT VOLTAGE (V)
DISABLED MODE SUPPLY CURRENT
vs. INPUT VOLTAGE
800
VEN = 5V
700
600
500
400
300
200
100
0
0 5 10 15 20 25 30
INPUT VOLTAGE (V)
CHARGE CURRENT
vs. BATTERY VOLTAGE
1000
900
800
700
600
500
400
300
200
100
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
BATTERY VOLTAGE (V)
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MAX8814
28V Linear Li+ Battery Charger
with Smart Autoboot Assistant
Package Information (continued)
(VIN = 5V, VBATT = 4V, RPOK = 1MΩ to BATT, EN = 0V, RISET = 2.8kΩ to GND, CBATT = 2.2µF, TA = -40°C to +85°C, unless other-
wise noted. Typical values are at TA = +25°C.)
1000
900
800
700
600
500
400
300
200
100
0
0
CHARGE CURRENT
vs. INPUT VOLTAGE
4 8 12 16 20 24 28
INPUT VOLTAGE (V)
1000
900
800
700
600
500
400
300
200
100
0
0
CHARGE CURRENT vs. INPUT
VOLTAGE HEADROOM
VBATT = 4V
VIN RISING
100 200 300 400
VIN - VBATT (mV)
500
STARTUP INTO PRECHARGE
MAX8814 toc06
VBATT = 2V
100mA/div
IBATT
0A
5V/div
VIN 0V
VEN 5V/div
0V
5V/div
VPOK
0V
40μs/div
SHUTDOWN
BATTERY REGULATION VOLTAGE
(FAST-CHARGE TO SHUTDOWN)
ACCURACY vs. AMBIENT TEMPERATURE
MAX8814 toc07
1.0
IBATT
500mA/div
0.8
IBATT = 0A
0.6
0A
0.4
VIN
5V/div
0.2
0V 0
5V/div
-0.2
-0.4
VEN 0V
-0.6
5V/div
-0.8
VPOK 0V -1.0
100μs/div
-40 -15 10 35 60 85
TEMPERATURE (°C)
CHARGE CURRENT vs. RISET
1000
100
10
1
1 10 100 1000 10,000
RISET (kΩ)
CHARGE CURRENT vs. AMBIENT
TEMPERATURE
700
VBATT = 4V
600
500
VBATT = 3.2V
400
300
200
100
0
-40
RISET = 2.8kΩ
-15 10 35 60
TEMPERATURE (°C)
85
VABI
VIN
VBATT
VABO
AUTOBOOT ENABLED
BY ABI SIGNAL
MAX8814 toc11
4μs/div
5V/div
0V VABI
5V/div
0V VIN
5V/div VBATT
0V
5V/div
0V VABO
AUTOBOOT ENABLED
BY INPUT SUPPLY
MAX8814 toc12
5V/div
0V
5V/div
0V
4μs/div
5V/div
0V
5V/div
0V
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MAX8814
28V Linear Li+ Battery Charger
with Smart Autoboot Assistant
Pin Description
PIN NAME
1 IN
2 GND
3 ISET
4 ABI
5 ABO
6 EN
7 POK
8 BATT
— EP
FUNCTION
Input Supply Voltage. Bypass IN to GND with a 1µF or larger ceramic capacitor to minimize line noise
and maximize input transient rejection.
Ground. 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.
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.
Autobooting External Input. See the Autobooting Assistant section and Table 1 for autobooting
conditions. ABI is pulled to GND through an internal 200kΩ resistor.
Autobooting Logic Output. See the Autobooting Assistant section and Table 1 for autobooting
conditions.
Logic-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.
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.
Battery Connection. Bypass BATT to GND with a minimum of 2.2µF of capacitor.
Exposed Paddle. Connect the exposed paddle to a large ground plane for maximum power
dissipation. Connect GND to the exposed paddle directly under the IC.
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