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MAX8844ZETD+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
General Description
The MAX8844Z/MAX8844Y intelligent, stand-alone con-
stant-current, constant-voltage (CCCV), thermally regu-
lated dual input linear chargers are designed for
charging a single-cell lithium-ion (Li+) battery. The
MAX8844Z/MAX8844Y integrate a current-sense circuit,
MOSFET pass element, thermal-regulation circuitry,
and eliminate 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 pre-
qualification 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 without damaging the IC.
The MAX8844Z/MAX8844Y achieve high flexibility by pro-
viding 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 charg-
er 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 ensure 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 disable 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, lead-
free TDFN 3mm x 3mm package (0.8mm max height).
Applications
Features
♦ CCCV, Thermally Regulated Linear One-Cell Li+
Battery Charger
♦ No External MOSFET, Reverse Blocking Diode, or
Current-Sense Resistor
♦ Programmable Fast-Charge Currents (1A
RMS
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)
MAX8844Z/MAX8844Y
28V Dual Input Linear Li+ Battery Chargers with
Battery Detection and Overvoltage-Protected Output
________________________________________________________________
Maxim Integrated Products
1
19-4279; Rev 0; 3/09
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
EVALUATION KIT
AVAILABLE
Ordering Information
PART
PIN-
PACKAGE
TOP MARK
ABO
ACTIVE
STATE
MAX8844ZETD+ 14 TDFN-EP* AEK Active high
MAX8844YETD+ 14 TDFN-EP* AEN Active low
Cellular and Cordless
Phones
Smart Phones and PDAs
Digital Still Cameras
MP3 Players
USB Appliances
Charging Cradles and
Docks
Bluetooth® Equipment
+
Denotes a lead(Pb)-free/RoHS-compliant package.
*
EP = Exposed pad.
Note: All devices are specified over the -40°C to +85°C oper-
ating temperature range.
Bluetooth is a registered trademark of Bluetooth SIG.
Typical Operating Circuit and Pin Configuration appear at
end of data sheet.
MAX8844Z/MAX8844Y
28V Dual Input Linear Li+ Battery Chargers with
Battery Detection and Overvoltage-Protected Output
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= 5V or V
USB
= 5V, V
BATT
= 4V, R
POK
= 1MΩ to BATT, EN = unconnected, R
SETI
= 2.8kΩ to GND, V
DETBAT
= 0V, C
BATT
=
2.2µF, T
A
= -40°C to +85°C, unless otherwise 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, 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 .........................................1A
RMS
Continuous Power Dissipation (T
A
= +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
PARAMETER CONDITIONS MIN TYP MAX UNITS
IN, USB
Input Supply Voltage Range 0 28 V
Input Supply Operating Voltage
Range
4.25 7.00 V
Overvoltage Lockout Trip
Threshold
V
IN
rising, 100mV hysteresis (typ) 7.0 7.5 8.0 V
Constant current charging
I
IN
- I
BATT
,
I
BATT
= 0A
0.25 0.50
Constant current charging
I
IN
- I
BATT,
I
BATT
= 500mA
1
IC disabled, V
EN
= 5V 0.23 0.50
T
A
= +25°C 0.02
Input Current
V
IN
= 4V,
V
BATT
= 4.2V
T
A
= +85°C 0.03
mA
BATT, CHG, POK
Minimum BATT Bypass
Capacitance
2.2 µF
V
BATT
Prequalification Threshold
Voltage
V
BATT
rising, 100mV hysteresis (typ) 2.3 2.5 2.7 V
T
A
= 0°C to +85°C 4.175 4.200 4.225
Battery Regulation Voltage I
BATT
= 0A
T
A
= -40°C to +85°C 4.158 4.200 4.242
V
Regulator Dropout Voltage (V
IN
-
V
BATT
)
V
BATT
= 4.1V, I
BATT
= 425mA 260 mV
V
IN
= 0 to 4V,
V
BATT
= 4.2V
510
BATT Input Current
(Note 2)
IC disabled 3
µA
T
A
= 0°C to +85°C 1120
Current-Sense Amplifier Gain
(I
BATT
to I
SETI
)
I
BATT
= 500mA
T
A
= -40°C to +85°C 1120
µA/A
MAX8844Z/MAX8844Y
28V Dual Input Linear Li+ Battery Chargers with
Battery Detection and Overvoltage-Protected Output
_______________________________________________________________________________________ 3
PARAMETER CONDITIONS MIN TYP MAX UNITS
T
A
= 0°C to +85°C 400 440 480
V
BATT
= 3.5V,
R
SETI
= 2.8kΩ
T
A
= -40°C to +85°C 375 440 505
Fast-Charge Current
V
BATT
= 3.5V,
R
SETI
= 14kΩ
74 88 102
mA
MAX8844Z 332 380 418
USB Fast-Charge Current
MAX8844Y 405 450 495
mA
CHG Top-Off Threshold I
BATT
falling, battery is charged, R
MIN
= 1.75kΩ (Note 3) 99 mA
CHG Hysteresis I
BATT
rising after top-off is detected, R
MIN
= 1.75kΩ 27 mA
CHG Detection Delay I
BATT
falls below top-off threshold 4.0 6.2 10.7 ms
Prequalification Charge Current
Percentage of the fast-charge current, V
BATT
= 2.2V,
T
A
= 0°C to +85°C
51117%
CHG, POK Output Low Threshold I
POK
= 5mA , I
CHG
= 5mA 0.4 V
T
A
= +25°C 1
CHG, POK Output High Leakage
Current
V
POK
= 5.5V, V
CHG
= 5.5V
T
A
= +85°C 0.002
µA
V
IN
rising 40
POK Threshold
(Note 2)
V
IN
- V
BATT
V
IN
falling 30
mV
DETBAT, SAFEOUT, SAFEUSB
DETBAT Logic Input Low
Threshold
0.4
DETBAT Logic Input High
Threshold
1.3
V
DETBAT Pullup Resistor DETBAT to VL = 3V 470 kΩ
Minimum SAFEOUT Bypass
Capacitance
1µF
SAFEOUT Regulated Output I
SAFEOUT
= 30mA, V
IN
= 5V, T
A
= 0°C to +85°C 4.5 4.7 4.9 V
SAFEOUT Current Limit 100 mA
Minimum SAFEUSB Bypass
Capacitance
1µF
SAFEUSB Regulated Output I
SAFEUSB
= 30mA, V
USB
= 5V, T
A
= 0°C to +85°C 4.5 4.7 4.9 V
SAFEUSB Current Limit 100 mA
EN, ABI, ABO, ABO
EN, ABI Internal Pulldown
Resistor
100 200 400 kΩ
EN, Logic Input Low Threshold
(Note 2)
4.25V ≤ V
IN
≤ 7V 0.4 V
EN, Logic Input High Theshold
(Note 2)
4.25V ≤ V
IN
≤ 7V 1.3 V
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 5V or V
USB
= 5V, V
BATT
= 4V, R
POK
= 1MΩ to BATT, EN = unconnected, R
SETI
= 2.8kΩ to GND, V
DETBAT
= 0V, C
BATT
=
2.2µF, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

MAX8844ZETD+T

Mfr. #:
Buy MAX8844ZETD+T
Manufacturer:
Maxim Integrated
Description:
Battery Management 28V Linear Li+ Battery Charger
Lifecycle:
New from this manufacturer.
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