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MAX8814ETA+T

P1-P3P4-P6P7-P9P10-P11
MAX8814
28V 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 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: 1A
RMS
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
IN
EN
ABI
ISET
GND
ABO
BATT
EP
ON
OFF
POK
SYSTEM
SUPPLY
2.2µF Li+
4.25V TO 28V
MAX8814
+
Typical Operating Circuit
PART TEMP RANGE PIN-PACKAGE
TOP
MARK
MAX8814ETA+ -40°C to +85°C
8 TDFN
(2mm x 2mm)
ABI
Bluetooth is a registered trademark of Bluetooth SIG.
+
Denotes a lead-free and RoHS-compliant package.
Pin Configuration appears at end of data sheet.
19-0994; Rev 3; 5/15
MAX8814
28V Linear Li+ Battery Charger
with Smart Autoboot Assistant
Maxim Integrated | 2www.maximintegrated.com
Absolute Maximum Ratings
Electrical Characteristics
(V
IN
= 5V, V
BATT
= 4V, R
POK
= 1MΩ to BATT, EN = 0V, R
ISET
= 2.8kΩ to GND, C
BATT
= 2.2µF, T
A
= -40°C to +85°C, unless other-
wise noted. Typical values are at T
A
= +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, POK to GND....................................-0.3V to +6V
ABO to GND............................................-0.3V to (V
BATT
+ 0.3V)
ISET to GND .............................................................-0.3V to +4V
IN to BATT Continuous Current .........................................1A
RMS
Continuous Power Dissipation (T
A
= +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
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Voltage Range 028V
Input Operating Voltage Range 4.25 6.80 V
V
IN
rising 40
Power-OK Threshold
V
IN
- V
BATT
,
10mV hysteresis (typ)
V
IN
falling 30
mV
Overvoltage-Lockout Trip
Threshold
V
IN
rising, 100mV hysteresis (typ) 6.8 7 7.5 V
Constant-current charging mode (I
BATT
= 0A) 0.8 1.35
IC disabled (V
EN
= 5V) 0.23 0.50
T
A
= +25°C 0.021 0.065
IN Input Current
V
IN
= 4V,
V
BATT
= 4.2V
T
A
= +85°C 0.021
mA
V
IN
= 0 to 4V,
V
BATT
= 4.2V
110
BATT Input Current
IC disabled 3
µA
T
A
= 0°C to +85°C 4.179 4.200 4.221
Battery Regulation Voltage I
BATT
= 0A
T
A
= -40°C to +85°C 4.158 4.200 4.242
V
Minimum BATT Bypass
Capacitance
2.2 µF
T
A
= 0°C to +85°C 524 570 616
V
BATT
= 3.5V
T
A
= -40°C to +85°C 485 570 656
T
A
= 0°C to +85°C 89 107 125
Fast-Charge Current
V
BATT
= 3.5V,
R
ISET
= 14kΩ
T
A
= -40°C to +85°C 80 107 134
mA
Prequalification Charge Current
Percentage of the fast-charge current, V
BATT
= 2.2V,
T
A
= 0°C to +85°C
41015%
Die Temperature Regulation
Threshold
+115 °C
V
BATT
Prequalification Threshold
Voltage
V
BATT
rising, 100mV hysteresis (typ) 2.3 2.5 2.7 V
Current-Sense Amplifier Gain
(I
BATT
to I
ISET
)
I
BATT
= 570mA 877.2 µA/A
MAX8814
28V Linear Li+ Battery Charger
with Smart Autoboot Assistant
Maxim Integrated | 3www.maximintegrated.com
PARAMETER CONDITIONS MIN TYP MAX UNITS
Regulator Dropout Voltage
(V
IN
- V
BATT
)
V
BATT
= 4.1V, I
BATT
= 425mA 240 500 mV
EN Logic-Input Low Voltage 4.25V < V
IN
< 6.5V 0.4 V
EN Logic-Input High Voltage 4.25V < V
IN
< 6.5V 1.3 V
EN and ABI Internal Pulldown
Resistance
100 200 400 kΩ
ABI Logic-Input Low Voltage V
IN
= 0V 0.4 V
ABI Logic-Input High Voltage V
IN
= 0V 1.3 V
ABO Output Low Voltage I
ABO (SINK)
= 1mA 0.4 V
ABO Output High Voltage I
ABO (SOURCE)
= 1mA
V
BATT
-
0.4V
V
POK Output Low Voltage I
POK
= 5mA 0.4 V
T
A
= +25°C 0.001 1
POK Output High Leakage
Current
V
POK
= 5.5V
T
A
= +85°C 0.002
µA
Electrical Characteristics (continued)
(V
IN
= 5V, V
BATT
= 4V, R
POK
= 1MΩ to BATT, EN = 0V, R
ISET
= 2.8kΩ to GND, C
BATT
= 2.2µF, T
A
= -40°C to +85°C, unless other-
Note 1: Specifications are 100% production tested at T
A
= +25°C. Limits over the operating temperature range are guaranteed by
design and characterization.
0
0.3
0.2
0.1
0.5
0.4
0.9
0.8
0.7
0.6
1.0
0 4 8 12 16 20 24 28
SUPPLY CURRENT
vs. VOLTAGE
MAX8814 toc01
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)
EN = 0V
0
100
200
300
400
500
600
700
800
0105 15202530
DISABLED MODE SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX8814 toc02
INPUT VOLTAGE (V)
SUPPLY CURRENT (μA)
V
EN
= 5V
0
200
100
400
300
600
500
700
900
800
1000
0 1.0 1.5 2.00.5 2.5 3.0 3.5 4.0 4.5
CHARGE CURRENT
vs. BATTERY VOLTAGE
MAX8814 toc03
BATTERY VOLTAGE (V)
CHARGE CURRENT (mA)
Typical Operating Characteristics
(V
IN
= 5V, V
BATT
= 4V, R
POK
= 1MΩ to BATT, EN = 0V, R
ISET
= 2.8kΩ to GND, C
BATT
= 2.2µF, T
A
= -40°C to +85°C, unless other-
P1-P3P4-P6P7-P9P10-P11

MAX8814ETA+T

Mfr. #:
Buy MAX8814ETA+T
Manufacturer:
Maxim Integrated
Description:
Battery Management 28V Linear Li+ Battery Charger
Lifecycle:
New from this manufacturer.
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