19-3205; Rev 1; 1/09
KIT
ATION
EVALU
E
BL
AVAILA
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.
♦
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
Features
MAX8600A
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
14 TDFN-EP*
(3mm x 3mm)
(T1433-2)
TOP
MARK
AEF
Applications
Cell Phones
Digital Cameras
PDAs
GPS
Portable Media Players
MP3 Players
Wireless Appliances
MAX8600AETD+
-40°C to +85°C
*EP
= Exposed pad.
+Denotes
a lead(Pb)-free/RoHS-compliant package.
Pin Configuration
TOP VIEW
+
BAT
SETI
THM
GND
CT
N.C.
BAT
Typical Operating Circuit
SAFE DC
1
2
3
4
5
6
7
14
13
12
FLT
DC
DC
CHG
POK
DC INPUT
4.1V TO 5.9V
DC
POK
LOGIC
SUPPLY
LED
MAX8600A
OFF
ON
EN
CT
CHG
FLT
MAX8600A
11
10
9
8
BAT
DC
EN
SETI
THM
GND
+
Li+
TDFN
________________________________________________________________
Maxim Integrated Products
1
For information on other Maxim products, visit Maxim’s website at www.maxim-ic.com.
Single-Input 1-Cell Li+ Charger with
OVP Protection and Programmable Charge Timer
MAX8600A
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 (T
A
= +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
(V
DC
= 5V, V
BAT
= 3.6V, V
EN
= 0V, R
SETI
= 2kΩ, C
CT
= 0.068µF, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at
T
A
= +25°C.) (Note 1)
PARAMETER
DC
Input Voltage Range
Input Operating Range
Input Undervoltage Threshold
Input Overvoltage Threshold
Input Supply Current
Shutdown Input Current
Input to BAT On-Resistance
Input to BAT Dropout Voltage
BAT
BAT Regulation Voltage
BAT Restart Fast-Charge
Threshold
I
BAT
= 0mA
From BAT regulation voltage
R
SETI
= 1.5kΩ
DC Charging Current
R
SETI
= 2kΩ
R
SETI
= 5kΩ
R
SETI
= 2kΩ, V
BAT
= 2.0V
Soft-Start Time
BAT Prequal Threshold
BAT Leakage Current
SETI
R
SETI
Resistance Range
Guaranteed by charging current
1.5
5.0
kΩ
Ramp time to fast-charge current
When charging current changes, BAT rising, 170mV
hysteresis
V
DC
= 0V, V
BAT
= 4.2V
2.30
TA = +25°C
TA = -40°C to +85°C
4.179
4.166
-180
950
675
275
67.5
4.2
4.2
-150
1000
750
300
75
1.2
2.50
0.001
2.54
5
4.221
4.234
-120
1050
825
325
82.5
ms
V
µA
mA
V
mV
(Note 2)
When
POK
goes low, DC rising, 500mV hysteresis
When
POK
goes high, DC rising, 200mV hysteresis
I
BAT
= 0mA, R
THM
= 10kΩ
V
EN
= 5V
V
DC
= 3.7V, V
BAT
= 3.6V
DC falling, 200mV hysteresis
5
0
4.1
3.89
6.2
4.0
6.5
980
275
0.25
75
14
6.0
4.10
6.8
2000
435
0.5
150
V
V
V
V
µA
µA
Ω
mV
CONDITIONS
MIN
TYP
MAX
UNITS
CONTROL INPUTS AND OUTPUTS
2
_______________________________________________________________________________________
Single-Input 1-Cell Li+ Charger with
OVP Protection and Programmable Charge Timer
ELECTRICAL CHARACTERISTICS (continued)
(V
DC
= 5V, V
BAT
= 3.6V, V
EN
= 0V, R
SETI
= 2kΩ, C
CT
= 0.068µF, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at
T
A
= +25°C.) (Note 1)
PARAMETER
EN
Logic Input Thresholds
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
TIMERS, CT
Timer Accuracy
Prequal Time Limit
Charge Time Limit
Top-Off Time Limit
THERMAL LOOP
Thermal-Limit Temperature
Thermal-Limit Gain
Junction temperature when the charge current is reduced,
T
J
rising
Reduction of I
BAT
for increase of T
J
, I
BAT
/T
J
(over +100°C)
+100
5
°C
%/°C
C
CT
= 0.068µF
From
POK
low and
EN
low to end of prequal charge,
BAT < 2.4V, C
CT
= 0.068µF
From
POK
low and
EN
low to end of charge, C
CT
= 0.068µF
From
CHG
high to done, C
CT
= 0.068µF
-20
34.8
334
69.6
+20
%
min
min
min
Match to thermistor resistance at T
A
= +25°C
R
THM
falling, 420Ω hysteresis
R
THM
rising, 2.7kΩ hysteresis
R
THM
falling, 230Ω hysteresis
-1%
3.72
26.7
240
10
3.94
28.3
309
+1%
4.13
29.7
370
kΩ
kΩ
kΩ
Ω
I
BAT
falling, battery is
charged
R
SETI
= 1.5kΩ
R
SETI
= 2kΩ
R
SETI
= 5kΩ
30
60
45
18
60
mA
I
CHG
= I
FLT
= 1mA
V
CHG
= V
FLT
= 5.5V,
V
DC
= 0V
T
A
= +25°C
T
A
= +85°C
12
0.001
0.01
100
1
mV
µA
I
POK
= 100µA
V
POK
= V
DC
= 16V
T
A
= +25°C
T
A
= +85°C
29
0.001
0.01
100
1
mV
µA
Rising
Falling
0.4
250
485
1000
1.6
V
kΩ
CONDITIONS
MIN
TYP
MAX
UNITS
MAX8600A
Note 1:
Limits are 100% production tested at T
A
= +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
Single-Input 1-Cell Li+ Charger with
OVP Protection and Programmable Charge Timer
MAX8600A
Typical Operating Characteristics
(V
DC
= 5V, R
SETI
= 2kΩ, V
BAT
= 3.6V, MAX8601 Evaluation Kit with thermal resistance of 50°C/W. T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. INPUT VOLTAGE
MAX8600A toc01
DISABLED SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX8600A toc02
CHARGE CURRENT
vs. BATTERY VOLTAGE
1000
800
600
R
SETI
= 1.5kΩ
R
SETI
= 2kΩ
MAX8600A toc03
1000
900
800
SUPPLY CURRENT (μA)
700
600
500
400
300
200
100
0
0
2
4
6
8
10
12
V
EN
= 0V
500
450
400
SUPPLY CURRENT (μA)
350
300
250
200
150
100
50
0
V
EN
= 5V
CHARGE CURRENT (mA)
R
SETI
= 3kΩ
400
DASHED DATA TAKEN
WITH PULSE TESTING TO
AVOID THERMAL LIMIT
200
0
0
2
4
6
8
10
12
14
0
14
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
V
BAT
(V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
CHARGE CURRENT
vs. DC VOLTAGE
R
SETI
= 1.5kΩ
1000
CHARGE CURRENT (mA)
R
SETI
= 2kΩ
800
600
400
200
0
0
2
4
6
8
10
12
14
V
DC
(V)
DASHED DATA
TAKEN WITH PULSE
TESTING TO AVOID
THERMAL LIMIT
R
SETI
= 3kΩ
MAX8600A toc04
CHARGE CURRENT
vs. INPUT VOLTAGE HEADROOM
900
800
CHARGE CURRENT (mA)
700
600
500
400
300
200
100
0
0
0.2
0.4
0.6
0.8
1.0
V
IN
- V
BAT
(V)
MAX8600A toc05
1200
1000
BATTERY REGULATION
VOLTAGE vs. AMBIENT TEMPERATURE
MAX8600A toc06
CHARGE CURRENT vs. AMBIENT
TEMPERATURE (750mA CHARGE)
900
800
CHARGE CURRENT (mA)
700
600
500
400
300
200
100
V
BAT
= 3.6V
V
BAT
= 4V
MAX8600A toc07
4.210
BATTERY REGULATION VOLTAGE (V)
4.205
4.200
4.195
4.190
4.185
4.180
-40
-15
10
T
A
(°C)
35
60
1000
0
85
-40
-15
10
T
A
(°C)
35
60
85
4
_______________________________________________________________________________________
Single-Input 1-Cell Li+ Charger with
OVP Protection and Programmable Charge Timer
Typical Operating Characteristics (continued)
(V
DC
= 5V, R
SETI
= 2kΩ, V
BAT
= 3.6V, MAX8601 Evaluation Kit with thermal resistance of 50°C/W. T
A
= +25°C, unless otherwise noted.)
CHARGE CURRENT vs. AMBIENT
TEMPERATURE (1A CHARGE)
MAX8600A toc08
MAX8600A
FAST-CHARGE TIME vs. C
CT
700
FAST-CHARGE TIME (MIN)
600
500
400
300
200
100
85
0
0.010
0.045
0.080
C
CT
(μF)
0.115
0.150
MAX8600A toc09
1100
1000
900
CHARGE CURRENT (mA)
800
700
600
500
400
300
200
100
-40
-15
10
T
A
(°C)
35
60
R
SETI
= 1.5kΩ
V
BAT
= 3.6V
V
BAT
= 4V
800
Pin Description
PIN
1, 7
NAME
BAT
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 (I
BAT
= 1500V/R
SETI
), 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 R
THM
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.
2
SETI
3
THM
4
5
6
8
GND
CT
N.C.
EN
10
POK
_______________________________________________________________________________________
5
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