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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX8844Y Datasheet

28V Dual Input Linear Li+ Battery Chargers

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EVALUATION KIT AVAILABLE
MAX8844Z/MAX8844Y
28V Dual Input Linear Li+ Battery Chargers with
Battery Detection and Overvoltage-Protected Output
General Description
The MAX8844Z/MAX8844Y intelligent, stand-alone con-
stant-current, constant-voltage (CCCV), thermally regulated
dual input linear chargers are designed for charging a sin-
gle-cell lithium-ion (Li+) battery. The MAX8844Z/MAX8844Y
integrates a current-sense circuit, MOSFET pass element,
thermal-regulation circuitry, and eliminates the external
reverse-blocking Schottky diode to create the simplest and
smallest charging solutions for handheld equipment.
The IC controls the charging sequence from the prequali-
fication state through constant current fast-charge, top-off
charge, and full-charge indication. Proprietary thermal-
regulation circuitry limits the die temperature during
fast-charging or when the IC is exposed to high ambient
temperatures, allowing maximum charging current with-
out damaging the IC.
The MAX8844Z/MAX8844Y achieve high flexibility by
providing adjustable fast-charge currents (SETI) and an
adjustable top-off current threshold (MIN) through external
resistors. The IC features a booting assistant circuit that
distinguishes input sources and battery connection and
provides an enable signal (ABO, ABO) for system booting.
The ICs also integrate two input overvoltage protected
LDO outputs (SAFEOUT, SAFEUSB) for low voltage
rated USB or charger inputs in system, and a battery pack
detection circuit (DETBAT) that disables the charger when
the battery pack is absent. Other features include an
active-low control input (EN), an active-low input power
source detection output (POK), and a fully charged top-off
threshold detection output (CHG).
The MAX8844Z/MAX8844Y automatically select between
either the USB or IN source. If both sources are present at
the same time, highest priority is given to the IN source. The
IN source is selected to insure the shortest charging time
for the system since it is able to deliver the highest current.
The MAX8844Z/MAX8844Y accept an input supply range
from 4.25V to 28V (IN and USB), but disables charging
if the input voltage exceeds +7.5V to protect against
unqualified or faulty AC adapters. The ICs operate over
the extended temperature range (-40°C to +85°C) and are
available in a compact 14-pin, thermally enhanced TDFN
3mm x 3mm package (0.8mm max height).
Applications
● Cellular and Cordless ● USB Appliances
Phones
● Charging Cradles and
● Smart Phones and PDAs Docks
● Digital Still Cameras ● Bluetooth® Equipment
● MP3 Players
Bluetooth is a registered trademark of Bluetooth SIG.
Features
● CCCV, Thermally Regulated Linear One-Cell Li+
Battery Charger
● No External MOSFET, Reverse Blocking Diode, or
Current-Sense Resistor
● Programmable Fast-Charge Currents (1ARMS max)
● Programmable Top-Off Current Threshold
● Input Overvoltage Protected 4.7V Output
(SAFEOUT) from IN
● Input Overvoltage Protected 4.7V Output
(SAFEUSB) from USB
● Proprietary Die Temperature Regulation Control
(+115°C)
● 4.25V to 28V Input Voltage Range with Input
Overvoltage Protection Above +7.5V
● Low-Dropout Voltage (300mV at 500mA)
● Input Power-Source Detection Output (POK),
Charge Status Output (CHG), Charge-Enable Input
(EN)
● Output for Autobooting (ABO, MAX8844Z)
● Output for Autobooting (ABO, MAX8844Y)
● Tiny 3mm x 3mm, 14-Pin TDFN Package, 0.8mm
Height (max)
Ordering Information
PART
PIN-
PACKAGE
TOP MARK
ABO ACTIVE
STATE
MAX8844ZETD+
14 TDFN-EP*
3mm x 3mm
AEK
Active high
MAX8844YETD+
14 TDFN-EP*
3mm x 3mm
AEN
Active low
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Note: All devices are specified over the -40°C to +85°C operat-
ing temperature range.
Typical Operating Circuit and Pin Configuration appear at
end of data sheet.
19-4279; Rev 1; 3/09


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX8844Y Datasheet

28V Dual Input Linear Li+ Battery Chargers

No Preview Available !

MAX8844Z/MAX8844Y
28V Dual Input Linear Li+ Battery Chargers with
Battery Detection and Overvoltage-Protected Output
Absolute Maximum Ratings
IN, USB to GND.....................................................-0.3V to +30V
ABI, BATT, EN, POK, ABO, ABO, CHG, DETBAT, SETI,
MIN, SAFEOUT,
SAFEUSB to GND................................................-0.3V to +6V
IN to BATT Continuous Current........................................1ARMS
Continuous Power Dissipation (TA = +70°C)
14-TDFN (derate 24.4mW/°C above 70°C)
(multilayer PCB)......................................................1951.2mW
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 or VUSB = 5V, VBATT = 4V, RPOK = 1MΩ to BATT, EN = unconnected, RSETI = 2.8kΩ to GND, VDETBAT = 0V, CBATT = 2.2μF,
TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
IN, USB
Input Supply Voltage Range
Input Supply Operating Voltage
Range
Overvoltage Lockout Trip
Threshold
Input Current
BATT, CHG, POK
Minimum BATT Bypass
Capacitance
VBATT Prequalification Threshold
Voltage
Battery Regulation Voltage
Regulator Dropout Voltage (VIN -
VBATT )
BATT Input Current
(Note 2)
Current-Sense Amplifier Gain
(IBATT to ISETI)
CONDITIONS
VIN rising, 100mV hysteresis (typ)
Constant current charging
IIN - IBATT, IBATT = 0A
Constant current charging
IIN - IBATT, IBATT = 500mA
IC disabled, VEN = 5V
VIN = 4V,
VBATT = 4.2V
TA = +25°C
TA = +85°C
VBATT rising, 100mV hysteresis (typ)
IBATT = 0A
TA = 0°C to +85°C
TA = -40°C to +85°C
VBATT = 4.1V, IBATT = 425mA
VIN = 0 to 4V,
VBATT = 4.2V
IC disabled
IBATT = 500mA
TA = 0°C to +85°C
TA = -40°C to +85°C
MIN TYP MAX UNITS
0
4.25
28
7.00
7.0 7.5 8.0
0.25 0.50
1
0.23
0.02
0.03
0.50
V
V
V
mA
2.2 µF
2.3 2.5 2.7
4.175
4.158
4.200
4.200
4.225
4.242
260
V
V
mV
5 10
µA
3
1120
1120
µA/A
www.maximintegrated.com
Maxim Integrated 2


Part Number MAX8844Y
Description 28V Dual Input Linear Li+ Battery Chargers
Maker Maxim Integrated Products
Total Page 17 Pages
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