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19-3205; Rev 1; 1/09
EVAALVUAAILTAIOBNLEKIT
Single-Input 1-Cell Li+ Charger with
OVP Protection and Programmable Charge Timer
General Description
The MAX8600A single-input linear battery charger safe-
ly charges single-cell Li+ batteries. Charging is opti-
mized for Li+ cells using a control algorithm that
includes low-battery precharging, voltage and current-
limited fast-charging, and top-off charging, while con-
tinuously monitoring the battery for overvoltage,
over/under temperature, and charging time. Charger
timeout protection is programmable, and the status is
indicated by three open-drain outputs.
The MAX8600A linear charger optimizes charging time
by adjusting the charge rate to accommodate the ther-
mal characteristics of a given application. There is no
need to reduce the maximum charge current to accom-
modate worst-case charger power dissipation.
The MAX8600A is a variation of the MAX8600 with
improved dropout and other spec changes. See
Maxim’s website for an outline of MAX8600/MAX8600A
differences.
The MAX8600A is available in a 3mm x 3mm power-
enhanced TDFN package.
Cell Phones
Digital Cameras
PDAs
GPS
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Applications
Portable Media Players
MP3 Players
Wireless Appliances
Pin Configuration
TOP VIEW
+
BAT 1
SETI 2
THM 3
GND 4
CT 5
N.C. 6
BAT 7
MAX8600A
14 FLT
13 DC
12 DC
11 CHG
10 POK
9 DC
8 EN
Features
Low Dropout -0.188V at 0.75A
Up to 1A Programmable Fast-Charge
5% Charge-Current Accuracy
Logic-Low Enable Input
14V Input Overvoltage Protection
Programmable On-Chip Charge Timer
Battery Thermistor Input
Three Charger-Status Outputs
Thermally Optimized Charge Rate
14-Pin, 3mm x 3mm TDFN Package
Ordering Information
PART
TEMP RANGE PIN-PACKAGE TOP
MARK
MAX8600AETD+ -40°C to +85°C
14 TDFN-EP*
(3mm x 3mm)
(T1433-2)
AEF
*EP = Exposed pad.
+Denotes a lead(Pb)-free/RoHS-compliant package.
Typical Operating Circuit
DC INPUT
4.1V TO 5.9V
OFF
ON
DC POK
MAX8600A
EN
CHG
CT
FLT
BAT
SETI
THM
GND
SAFE DC
LOGIC
SUPPLY
LED
+
Li+
TDFN
________________________________________________________________ Maxim Integrated Products 1
For information on other Maxim products, visit Maxim’s website at www.maxim-ic.com.

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Single-Input 1-Cell Li+ Charger with
OVP Protection and Programmable Charge Timer
ABSOLUTE MAXIMUM RATINGS
POK to GND.................................................-0.3V to (DC + 0.3V)
DC to GND .............................................................-0.3V to +16V
BAT, CT, CHG, EN, FLT, SETI,
THM to GND ......................................................-0.3V to +5.5V
Continuous Power Dissipation (TA = +70°C)
14-Pin TDFN 3mm x 3mm Multilayer PCB (derate 24.4mW/°C
above +70°C)...................................................... 1951.2mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature Range ............................-40°C to +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
(VDC = 5V, VBAT = 3.6V, V EN = 0V, RSETI = 2kΩ, CCT = 0.068µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 1)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
DC
Input Voltage Range
0 14 V
Input Operating Range
Input Undervoltage Threshold
Input Overvoltage Threshold
(Note 2)
When POK goes low, DC rising, 500mV hysteresis
When POK goes high, DC rising, 200mV hysteresis
4.1 6.0
3.89 4.0 4.10
6.2 6.5 6.8
V
V
V
Input Supply Current
Shutdown Input Current
Input to BAT On-Resistance
Input to BAT Dropout Voltage
IBAT = 0mA, RTHM = 10kΩ
VEN = 5V
VDC = 3.7V, VBAT = 3.6V
DC falling, 200mV hysteresis
980 2000
µA
275 435
µA
0.25 0.5
Ω
5 75 150 mV
BAT
BAT Regulation Voltage
IBAT = 0mA
TA = +25°C
TA = -40°C to +85°C
4.179 4.2 4.221
4.166 4.2 4.234
V
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Threshold
From BAT regulation voltage
-180 -150 -120
mV
DC Charging Current
Soft-Start Time
RSETI = 1.5kΩ
RSETI = 2kΩ
RSETI = 5kΩ
RSETI = 2kΩ, VBAT = 2.0V
Ramp time to fast-charge current
950 1000 1050
675 750 825
275 300 325
67.5 75 82.5
1.2
mA
ms
BAT Prequal Threshold
When charging current changes, BAT rising, 170mV
hysteresis
2.30 2.50 2.54
V
BAT Leakage Current
VDC = 0V, VBAT = 4.2V
CONTROL INPUTS AND OUTPUTS
0.001 5
µA
SETI
RSETI Resistance Range
Guaranteed by charging current
1.5 5.0 kΩ
2 _______________________________________________________________________________________

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Single-Input 1-Cell Li+ Charger with
OVP Protection and Programmable Charge Timer
ELECTRICAL CHARACTERISTICS (continued)
(VDC = 5V, VBAT = 3.6V, V EN = 0V, RSETI = 2kΩ, CCT = 0.068µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 1)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
EN
Logic Input Thresholds
Rising
Falling
1.6
V
0.4
Logic Input Resistance to
GND
POK
Logic Output Voltage, Low
Logic Output Leakage
Current, High
CHG, FLT
Logic Output Voltage, Low
Logic Output Leakage
Current, High
CHG
CHG/Top-Off Current
Threshold
THM
THM Pullup Resistance
THM Resistance, Hot
THM Resistance, Cold
THM Resistance, Disabled
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Timer Accuracy
Prequal Time Limit
Charge Time Limit
Top-Off Time Limit
THERMAL LOOP
IPOK = 100µA
VPOK = VDC = 16V
TA = +25°C
TA = +85°C
ICHG = IFLT = 1mA
VCHG = VFLT = 5.5V,
VDC = 0V
TA = +25°C
TA = +85°C
IBAT falling, battery is
charged
RSETI = 1.5kΩ
RSETI = 2kΩ
RSETI = 5kΩ
Match to thermistor resistance at TA = +25°C
RTHM falling, 420Ω hysteresis
RTHM rising, 2.7kΩ hysteresis
RTHM falling, 230Ω hysteresis
CCT = 0.068µF
From POK low and EN low to end of prequal charge,
BAT < 2.4V, CCT = 0.068µF
From POK low and EN low to end of charge, CCT = 0.068µF
From CHG high to done, CCT = 0.068µF
250 485 1000
kΩ
29
0.001
0.01
100
1
mV
µA
12
0.001
0.01
100
1
mV
µA
60
30 45 60 mA
18
-1% 10 +1%
3.72 3.94 4.13
26.7 28.3 29.7
240 309 370
kΩ
kΩ
kΩ
Ω
-20 +20
34.8
334
69.6
%
min
min
min
Thermal-Limit Temperature
Thermal-Limit Gain
Junction temperature when the charge current is reduced,
TJ rising
Reduction of IBAT for increase of TJ, IBAT/TJ (over +100°C)
+100
5
°C
%/°C
Note 1: Limits are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by design
and characterization.
Note 2: Guaranteed by undervoltage- and overvoltage-threshold testing. For complete charging, the input voltage must be greater
than 4.35V.
_______________________________________________________________________________________ 3

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Single-Input 1-Cell Li+ Charger with
OVP Protection and Programmable Charge Timer
Typical Operating Characteristics
(VDC = 5V, RSETI = 2kΩ, VBAT = 3.6V, MAX8601 Evaluation Kit with thermal resistance of 50°C/W. TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. INPUT VOLTAGE
1000
900
800
700
600
500
400
300
200
100 VEN = 0V
0
0 2 4 6 8 10 12 14
INPUT VOLTAGE (V)
500
450
400
350
300
250
200
150
100
50
0
0
DISABLED SUPPLY CURRENT
vs. INPUT VOLTAGE
VEN = 5V
2 4 6 8 10 12 14
INPUT VOLTAGE (V)
CHARGE CURRENT
vs. BATTERY VOLTAGE
1000 RSETI = 1.5kΩ
800 RSETI = 2kΩ
600 RSETI = 3kΩ
400
DASHED DATA TAKEN
WITH PULSE TESTING TO
200 AVOID THERMAL LIMIT
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
VBAT (V)
CHARGE CURRENT
vs. DC VOLTAGE
1200
RSETI = 1.5kΩ
1000
RSETI = 2kΩ
800
600 RSETI = 3kΩ
400
DASHED DATA
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TAKEN WITH PULSE
TESTING TO AVOID
THERMAL LIMIT
0
0 2 4 6 8 10 12 14
VDC (V)
1000
900
800
700
600
500
400
300
200
100
0
0
CHARGE CURRENT
vs. INPUT VOLTAGE HEADROOM
0.2 0.4 0.6 0.8 1.0
VIN - VBAT (V)
BATTERY REGULATION
VOLTAGE vs. AMBIENT TEMPERATURE
4.210
4.205
4.200
4.195
4.190
4.185
4.180
-40 -15 10 35 60 85
TA (°C)
CHARGE CURRENT vs. AMBIENT
TEMPERATURE (750mA CHARGE)
1000
900
VBAT = 4V
800
700
600
500 VBAT = 3.6V
400
300
200
100
0
-40 -15 10 35 60 85
TA (°C)
4 _______________________________________________________________________________________

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Single-Input 1-Cell Li+ Charger with
OVP Protection and Programmable Charge Timer
Typical Operating Characteristics (continued)
(VDC = 5V, RSETI = 2kΩ, VBAT = 3.6V, MAX8601 Evaluation Kit with thermal resistance of 50°C/W. TA = +25°C, unless otherwise noted.)
CHARGE CURRENT vs. AMBIENT
TEMPERATURE (1A CHARGE)
1100
1000 VBAT = 4V
900
800
700 VBAT = 3.6V
600
500
400
300
200 RSETI = 1.5kΩ
100
-40 -15 10 35 60 85
TA (°C)
FAST-CHARGE TIME vs. CCT
800
700
600
500
400
300
200
100
0
0.010
0.045
0.080
CCT (μF)
0.115
0.150
Pin Description
PIN NAME
1, 7 BAT
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2 SETI
3 THM
4 GND
5 CT
6 N.C.
8 EN
10 POK
FUNCTION
Battery Connection. The IC delivers charging current and monitors battery voltage using BAT. Bypass
BAT to GND with a 2.2µF or larger ceramic capacitor. Connect both BAT inputs together externally. BAT
is high impedance when the IC is disabled. Ensure that all BAT pins are connected together.
DC Charge-Current Programming Pin. Connect a resistor from SETI to GND to set the maximum charging
current (IBAT = 1500V/RSETI), the prequal current, and the CHG done threshold. Monitor charging current
by measuring this pin voltage. SETI is high-impedance when EN is high, or DC is at GND.
Thermistor Input. Connect a 10kΩ NTC thermistor, in close proximity to the battery, from THM to ground
to monitor the battery temperature. The IC suspends charging when RTHM is outside the hot and cold
limits. Disable thermistor functionality by connecting THM to GND. THM is high impedance when EN is
high or DC is at GND.
Ground
Timing Capacitor Input. Connect a capacitor from CT to GND to set the precharge timeout, top-off time,
and fast-charge timeout. Connect CT to GND to disable the timers. CT is high impedance when EN is
high or DC is at GND.
No Connection. Make no external circuit connection.
Active-Low Enable Input. Drive low or connect EN to GND to enable the charger. Drive EN high to disable
the charger. EN has an internal 470kΩ pulldown resistance to GND.
Power-OK Monitor. POK is an open-drain output that pulls low when a valid charging source is detected.
POK is high impedance when DC voltage is outside valid range. POK remains active monitoring DC with
the charger enabled or disabled.
_______________________________________________________________________________________ 5