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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX8845Y Datasheet

28V Linear Li+ Battery Chargers

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19-4405; Rev 0; 3/09
28V Linear Li+ Battery Chargers with Battery
Detection and Overvoltage Protected Output
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General Description
The MAX8845Z/MAX8845Y are intelligent, stand-alone
constant-current, constant-voltage (CCCV), thermally
regulated linear chargers designed for charging a sin-
gle-cell lithium-ion (Li+) battery. The MAX8845Z/
MAX8845Y integrate a current-sense circuit, MOSFET
pass element, thermal-regulation circuitry, and elimi-
nates the external reverse-blocking Schottky diode to
create the simplest and smallest charging solutions for
handheld equipment.
The ICs control 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 ICs are exposed to
high ambient temperatures, allowing maximum charg-
ing current without damaging the ICs.
The MAX8845Z/MAX8845Y achieve high flexibility
by providing adjustable fast-charge currents
(SETI) and an adjustable top-off current threshold
(MIN) through external resistors. The MAX8845Z/
MAX8845Y feature a booting assistant circuit that dis-
tinguishes input sources and battery connection and
provides an enable signal (ABO—MAX8845Z and
ABO—MAX8845Y) for system booting.
The MAX8845Z/MAX8845Y also integrate an overvolt-
age-protected output (SAFEOUT) 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 MAX8845Z/MAX8845Y accept an input supply
range from 4.25V to 28V, but disables charging if the
supply voltage exceeds +7.5V to protect against
unqualified or faulty AC adapters. The IC’s operate over
the extended temperature range (-40°C to +85°C) and
are available in a compact 12-pin, thermally enhanced
thin QFN, 3mm x 3mm package (0.8mm max height).
Applications
Cellular and Cordless Phones
Smart Phones and PDAs
Digital Still Cameras
MP3 Players
USB Appliances
Charging Cradles and Docks
Bluetooth® Equipment
Features
CCCV, Thermally Regulated Linear 1-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 (MIN)
Input Overvoltage Protected 4.7V Output
(SAFEOUT)
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—MAX8845Z,
ABO—MAX8845Y)
Tiny, 3mm x 3mm 12-Pin Thin QFN Package,
0.8mm Height (max)
Ordering Information
PART
PIN-PACKAGE
TOP
MARK
ABO
ACTIVE
STATE
MAX8845ZETC+ 12 Thin QFN-EP* ABL Active high
MAX8845YETC+ 12 Thin QFN-EP* ABM Active low
Note: All devices are specified over the -40°C to +85°C oper-
ating temperature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Typical Operating Circuit and Pin Configurations appear at
end of data sheet.
Bluetooth is a registered trademark of Bluetooth SIG.
________________________________________________________________ Maxim Integrated Products 1
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX8845Y Datasheet

28V Linear Li+ Battery Chargers

No Preview Available !

28V Linear Li+ Battery Chargers with Battery
Detection and Overvoltage Protected Output
www.daAtasBheSeOt4uL.cUomTE MAXIMUM RATINGS
IN to GND ...............................................................-0.3V to +30V
ABI, BATT, EN, POK, ABO, ABO, CHG, DETBAT, SETI, MIN,
SAFEOUT to GND ................................................-0.3V to +6V
IN to BATT Continuous Current .........................................1ARMS
Continuous Power Dissipation (TA = +70°C)
12-Thin QFN (derate 14.7mW/°C above +70°C)
(multilayer PCB) ......................................................1176.5mW
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 = unconnected, RSETI = 2.8kΩ to GND, VDETBAT = 0, CBATT = 2.2µF, TA = -40°C to
+85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
Input Supply Voltage Range
Input Supply Operating Voltage Range
Overvoltage Lockout Trip Threshold
CONDITIONS
VIN rising, 100mV hysteresis (typ)
Constant current charging
IIN - IBATT, IBATT = 0
MIN
0
4.25
7.0
TYP
7.5
0.22
MAX
28
7.00
8.0
UNITS
V
V
V
0.50
Input Current
BATT, CHG, POK
Minimum BATT Bypass Capacitance
VBATT Prequalification Threshold Voltage
Battery Regulation Voltage
Regulator Dropout Voltage (VIN - VBATT)
BATT Input Current
Current-Sense Amplifier Gain (IBATT to ISETI)
Fast-Charge Current
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 = 0
TA = -40°C to +85°C
VBATT = 4.1V, IBATT = 425mA
VIN = 0 to 4V,
VBATT = 4.2V
IC disabled
IBATT = 500mA
VBATT = 3.5V,
RSETI = 2.8kΩ
TA = 0°C to +85°C
TA = -40°C to +85°C
VBATT = 3.5V,
RSETI = 14kΩ
TA = 0°C to +85°C
1
0.20 0.50
0.02
0.03
2.3
4.175
4.158
2.2
2.5
4.200
4.200
260
2.7
4.225
4.242
5 10
3
1016
460 500 540
425 500 575
85 100 115
mA
µF
V
V
mV
µA
µA/A
mA
CHG Top-Off Threshold
IBATT falling, battery is charged
RMIN = 1.75kΩ
106 mA
CHG Hysteresis
CHG Detection Delay
IBATT rising after top-off is detected,
RMIN = 1.75kΩ
IBATT falls below top-off threshold
38 mA
4.0 6.2 10.7 ms
2 _______________________________________________________________________________________


Part Number MAX8845Y
Description 28V Linear Li+ Battery Chargers
Maker Maxim Integrated Products
Total Page 18 Pages
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