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19-4405; Rev 0; 3/09
28V Linear Li+ Battery Chargers with Battery
Detection and Overvoltage Protected Output
www.datasheet4u.com
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.

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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 _______________________________________________________________________________________

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28V Linear Li+ Battery Chargers with Battery
Detection and Overvoltage Protected Output
www.daEtaLshEeeCt4Tu.RcomICAL CHARACTERISTICS (continued)
(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
CONDITIONS
MIN TYP MAX UNITS
Prequalification Charge Current
Percentage of the fast-
charge current, VBATT TA = 0°C to +85°C
= 2.2V
5
10 15
%
CHG, POK Output Low Threshold
CHG, POK Output High Leakage Current
POK Threshold
DETBAT, SAFEOUT
DETBAT Logic-Input Low Threshold
DETBAT Logic-Input High Threshold
DETBAT Pullup Resistor
Minimum SAFEOUT Bypass Capacitance
SAFEOUT Regulated Output
SAFEOUT Current Limit
EN, ABI, ABO, ABO
EN, ABI Internal Pulldown Resistor
EN Logic-Input Low Threshold
EN Logic-Input High Threshold
ABI Logic-Input Low Threshold
ABI Logic-Input High Threshold
ABO Output Low Threshold (MAX8845Y)
ABO Output High Threshold (MAX8845Y)
IPOK = 5mA , ICHG = 5mA
VPOK = 5.5V,
VCHG = 5.5V
TA = +25°C
TA = +85°C
VIN - VBATT
VIN rising
VIN falling
DETBAT to VL = 3V
ISAFEOUT = 30mA, VIN = 5V, TA = 0°C to
+85°C
0.4
1
0.01
40
30
0.4
1.3
470
1
4.5 4.7 4.9
100
4.25V VIN 7V
4.25V VIN 7V
VBATT = 4V, VIN = 0
VBATT = 4V, VIN = 0
Open drain, IABO(SINK) = 1mA
Open drain, 100kΩ pullup to BATT
100 200
1.3
1.3
VBATT -
0.4V
400
0.4
0.4
0.4
V
µA
mV
V
kΩ
µF
V
mA
kΩ
V
V
V
V
V
V
ABO Output Low Threshold
(MAX8845Z)
IABO(SINK) = 1mA
0.4 V
ABO Output High Threshold (MAX8845Z)
THERMAL
Die Temperature Regulation Threshold
IABO(SOURCE) = 1mA
VBATT -
0.4V
115
V
°C
Note 1: Specifications are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by
design and characterization.
_______________________________________________________________________________________ 3

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28V Linear Li+ Battery Chargers with Battery
Detection and Overvoltage Protected Output
www.datasheet4u.com
Typical Operating Characteristics
(VIN = 5V, VBATT = 4V, RPOK = RCHG = 200kΩ to 5V, EN = unconnected, RSETI = 2.8kΩ to GND, RMIN = 1.74kΩ to GND, RDETBAT =
4.7kΩ to GND, CBATT = 2.2µF, TA = +25°C, unless otherwise noted.)
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
SUPPLY CURRENT
vs. INPUT VOLTAGE
VEN = 0,
IBATT = 0
VIN RISING
4 8 12 16 20 24 28
INPUT VOLTAGE (V)
DISABLED MODE SUPPLY CURRENT
vs. INPUT VOLTAGE
0.6
VEN = 5V
0.5
0.4
0.3
0.2
0.1
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)
CHARGE CURRENT
vs. INPUT VOLTAGE
600
500
400
300
200
100
0
0 4 8 12 16 20 24 28
INPUT VOLTAGE (V)
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
SAFEOUT OUTPUT VOLTAGE
vs. LOAD CURRENT
20 40 60 80
LOAD CURRENT (mA)
100
1000
900
800
700
600
500
400
300
200
100
0
0
CHARGE CURRENT
vs. INPUT VOLTAGE HEADROOM
VBATT = 4V,
VIN RISING
100 200 300 400 500 600
VIN - VBATT (mV)
STARTUP INTO PRECHARGE
MAX8845Z/Y toc08
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
SAFEOUT OUTPUT VOLTAGE
vs. INPUT VOLTAGE
ISAFEOUT = 1mA
4 8 12 16 20 24 28
INPUT VOLTAGE (V)
SHUTDOWN
(FAST-CHARGE TO SHUTDOWN)
MAX8845Z/Y toc09
IBATT
VIN
VEN
VPOK
100mA/div IBATT
0
5V/div
0
5V/div
0
VIN
VEN
5V/div
0 VPOK
500mA/div
0
5V/div
0
5V/div
0
5V/div
0
40μs/div
40μs/div
4 _______________________________________________________________________________________

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28V Linear Li+ Battery Chargers with Battery
Detection and Overvoltage Protected Output
www.datasheet4u.com
Typical Operating Characteristics (continued)
(VIN = 5V, VBATT = 4V, RPOK = RCHG = 200kΩ to 5V, EN = unconnected, RSETI = 2.8kΩ to GND, RMIN = 1.74kΩ to GND, RDETBAT =
4.7kΩ to GND, CBATT = 2.2µF, TA = +25°C, unless otherwise noted.)
BATTERY REGULATION ACCURACY
vs. AMBIENT TEMPERATURE
1.0
0.8 IBATT = 0
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
-40
-15 10 35 60
AMBIENT TEMPERATURE (°C)
85
FAST-CHARGE CURRENT
vs. RSETI
1000
100
10
1
1 10 100 1000 10,000
RSETI (kΩ)
TOP-OFF CURRENT THRESHOLD
vs. 1/RMIN (kΩ)
600
550
500
450
TOP-OFF CURRENT RISING
400
350
300
250
200
150 TOP-OFF CURRENT FALLING
100
50
0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9
1/RMIN (kΩ)
CHARGE CURRENT
vs. AMBIENT TEMPERATURE
700
600 VBATT = 4V
500
400 VBATT = 3.2V
300
200
100
0
-40
RSETI = 2.8kΩ
-20 0 20 40 60 80 100
AMBIENT TEMPERATURE (°C)
AUTOBOOT ENABLED BY ABI SIGNAL
(MAX8845Z)
MAX8845Z/Y toc14
VABI
VIN
VBATT
VABO
4μs/div
5V/div
0
5V/div
0
5V/div
0
5V/div
0
AUTOBOOT ENABLED BY INPUT VOLTAGE
(MAX8845Z)
MAX8845Z/Y toc15
VABI
VIN
VBATT
VABO
5V/div
0
5V/div
0
5V/div
0
5V/div
0
20μs/div
AUTOBOOT ENABLED BY ABI SIGNAL
(MAX8845Y)
MAX8845Z/Y toc16
5V/div
VABI 0
5V/div
VIN 0
VBATT
VABO
4μs/div
5V/div
0
5V/div
0
_______________________________________________________________________________________ 5