19-3565; Rev 3; 12/08
KIT
ATION
EVALU
E
BL
AVAILA
Single-/Dual-Input 1-Cell Li+ Chargers with
OVP Protection and Programmable Charge Timer
General Description
The MAX8600/MAX8601 single-/dual-input linear bat-
tery chargers safely charge single-cell Li+ batteries.
The charging rate is optimized to accommodate the
thermal characteristics of a given application. There is
no need to reduce the maximum charge current or
worst-case charger power dissipation. 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/undertemperature, and charging time. The charg-
er timeout protection is programmable. The charger
status is indicated by three open-drain outputs.
The MAX8601 automatically selects between either a
USB or AC adapter input source. The AC adapter
charge current is programmable, while USB charge
current is set not to exceed either 100mA or 500mA,
depending on the USEL input. The MAX8600 is a sin-
gle-input charger with no USB source input.
The MAX8600/MAX8601 are available in a 3mm x 3mm
power-enhanced TDFN package.
Features
♦
Single- (MAX8600) or Dual- (MAX8601) Input Li+
Charger
♦
Up to 1A Programmable Fast-Charge
♦
100mA/500mA USB Select Input (MAX8601)
♦
±5% Fast-Charge Current-Limit Accuracy
♦
14V Input Overvoltage Protection
♦
Programmable On-Chip Charge Timers
♦
Battery Thermistor Input
♦
Charger-Status Outputs
♦
Thermally Optimized Charge Rate
♦
14-Pin, 3mm x 3mm TDFN Package
MAX8600/MAX8601
Ordering Information
PART
MAX8600ETD+
TEMP
RANGE
-40°C to
+85°C
-40°C to
+85°C
PIN-PACKAGE
14 TDFN-EP* 3mm x
3mm (T1433-2)
14 TDFN-EP* 3mm x
3mm (T1433-2)
TOP
MARK
ABB
AAC
Applications
Cell Phones
Digital Cameras
PDAs
Portable Media Players
MP3 Players
Wireless Appliances
MAX8601ETD+
*EP
= Exposed pad.
+Denotes
a lead(Pb)-free/RoHS-compliant package.
Typical Operating Circuit
Pin Configurations
V
LOGIC
TOP VIEW
+
BAT
SETI
THM
GND
CT
N.C.
N.C.
1
2
3
4
5
6
7
14
13
12
FLT
DC
DC
CHG
POK
N.C.
EN
AC
ADAPTER
DC
FLT
POK
CHARGE
STATUS
GND
USB
PORT
CHG
BAT
USB
MAX8600
11
10
9
8
MAX8601
Li+
500mA
100mA
OFF
ON
USEL
EN
SETI
THM
CT
TDFN
Pin Configurations continued at end of data sheet.
________________________________________________________________
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.
Single-/Dual-Input 1-Cell Li+ Chargers with
OVP Protection and Programmable Charge Timer
MAX8600/MAX8601
ABSOLUTE MAXIMUM RATINGS
DC, USB to GND ....................................................-0.3V to +16V
BAT, CT,
CHG, EN, FLT,
SETI,
POK,
THM, USEL to GND..................................-0.3V to +6.0V
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 ......................................................+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
= V
USB
= 5V, V
BAT
= 4V, 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 OR USB (Note 2)
Input Voltage Range
Input Operating Range
Input Undervoltage Threshold
Input Overvoltage Threshold
Input Overvoltage Delay
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
V
USB
= 0V
R
SETI
= 2kΩ
R
SETI
= 5kΩ
Prequal, R
SETI
= 2kΩ, V
BAT
= 2.5V
V
USEL
= 5V
USB Charging Current
Soft-Start Time
BAT Prequal Threshold
BAT Leakage Current
SETI
R
SETI
Resistance Range
Guaranteed by charging current
1.5
5.0
kΩ
V
DC
= 0V
V
USEL
= 0V
Prequal, R
SETI
= 2kΩ, V
BAT
= 2.5V
Ramp time to fast-charge current
V
BAT
rising, 180mV hysteresis (typ)
V
DC
= V
USB
= 0V, V
BAT
= 4.2V
2.9
T
A
= +25°C
T
A
= -40°C to +85°C
4.179
4.166
-180
950
727
280
60
450
80
60
4.2
4.2
-150
1000
750
300
75
475
95
75
1.2
3.0
0.001
3.1
5
4.221
4.234
-120
1050
773
320
90
500
100
90
ms
V
µA
mA
mA
V
mV
(Note 3)
Input rising, 500mV hysteresis (typ)
Input rising, 200mV hysteresis (typ)
From overvoltage event to charger disabled
I
BAT
= 0mA, R
THM
= 10kΩ
V
EN
= 5V, T
A
= +25°C
Input = 3.7V, V
BAT
= 3.6V
Input falling, 200mV hysteresis (typ)
5
0
4.15
3.85
7.2
4.0
7.5
0.25
750
275
0.5
55
1200
435
0.8
120
14
7.00
4.15
7.8
V
V
V
V
s
µA
µA
Ω
mV
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
Single-/Dual-Input 1-Cell Li+ Chargers with
OVP Protection and Programmable Charge Timer
ELECTRICAL CHARACTERISTICS (continued)
(V
DC
= V
USB
= 5V, V
BAT
= 4V, 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,
USEL
Logic Input Thresholds
Logic Input Leakage Current
POK, CHG, FLT
Logic Output Voltage, Low
Logic Output Leakage
Current, High
CHG
CHG/Top-Off
Threshold
THM
THM Pullup Resistance
THM Resistance, Hot
THM Resistance, Cold
THM Resistance, Disabled
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
, from V
DC
, R
SETI
= 1.5kΩ
+100
5
°C
%/°C
C
CT
= 0.068µF
From entering prequal to
FLT
low, V
BAT
< 3V
From entering fast-charge to
FLT
low, 3V < V
BAT
< 4.2V
From
CHG
high to charger disabled
-20
34.8
334
34.8
+20
%
min
min
min
R
THM
falling, 420Ω hysteresis (typ)
R
THM
rising, 2.7kΩ hysteresis (typ)
R
THM
falling, 230Ω hysteresis (typ)
3.72
26.7
274
10
3.94
28.3
309
4.13
29.7
337
kΩ
kΩ
kΩ
Ω
I
BAT
falling, battery is
charged
R
SETI
= 1.5kΩ
R
SETI
= 2kΩ
R
SETI
= 5kΩ
37.5
75
56.25
22.5
75.0
mA
I
POK,
= I
CHG
= I
FLT
= 1mA
V
POK
= V
CHG
= V
FLT
= 5.5V,
V
DC
= V
USB
= 0V
T
A
= +25°C
T
A
= +85°C
12
0.001
0.01
100
1
mV
µA
Rising
Falling
V
EN
= V
USEL
= 0 to 5.5V
T
A
= +25°C
T
A
= +85°C
0.4
0.001
0.01
1
1.6
V
µA
CONDITIONS
MIN
TYP
MAX
UNITS
MAX8600/MAX8601
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:
Input refers to either DC or USB.
Note 3:
Guaranteed by undervoltage- and overvoltage-threshold testing. For complete charging, the input voltage must be greater
than 4.32V.
_______________________________________________________________________________________
3
Single-/Dual-Input 1-Cell Li+ Chargers with
OVP Protection and Programmable Charge Timer
MAX8600/MAX8601
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.)
DISABLED SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX8600/01 toc02
MAX8600/01 toc01
SUPPLY CURRENT vs. INPUT VOLTAGE
1000
900
800
SUPPLY CURRENT (μA)
700
600
500
400
300
200
100
0
0
2
4
6
8
10
12
14
INPUT VOLTAGE (V)
V
EN
= 0V
1000
900
800
SUPPLY CURRENT (μA)
700
600
500
400
300
200
100
0
0
CHARGE CURRENT
vs. BATTERY VOLTAGE
1000
R
SETI
= 1.5kΩ
CHARGE CURRENT (mA)
800
600
400
200
R
SETI
= 2kΩ
R
SETI
= 3kΩ
DASHED DATA TAKEN
WITH PULSE TESTING TO
AVOID THERMAL LIMIT
MAX8600/01 toc03
MAX8600/01 toc06
V
EN
= 5V
0
2
4
6
8
10
12
14
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
V
BAT
(V)
INPUT VOLTAGE (V)
CHARGE CURRENT
vs. DC VOLTAGE
MAX8600/01 toc04
CHARGE CURRENT vs. USB VOLTAGE
700
CHARGE CURRENT (mA)
600
500
400
300
200
100
0
V
USEL
= 0V
V
USEL
= 5V
DASHED DATA TAKEN WITH
PULSE TESTING TO AVOID THERMAL LIMIT
MAX8600/01 toc05
CHARGE CURRENT vs. INPUT
VOLTAGE HEADROOM
1000
900
800
CHARGE CURRENT (mA)
700
600
500
400
300
200
100
0
800
1000
CHARGE CURRENT (mA)
800
600
400
200
0
0
2
4
6
8
R
SETI
= 1.5kΩ
R
SETI
= 2kΩ
R
SETI
= 3kΩ
DASHED DATA
TAKEN WITH PULSE
TESTING TO AVOID
THERMAL LIMIT
10
12
14
0
2
4
6
8
10
12
14
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
(V
IN
- V
BAT
) (V)
V
DC
(V)
V
USB
(V)
BATTERY REGULATION
VOLTAGE vs. AMBIENT TEMPERATURE
MAX8600/01 toc07
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
MAX8600/01 toc08
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-/Dual-Input 1-Cell Li+ Chargers 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)
1000
900
CHARGE CURRENT (mA)
800
700
600
500
400
300
200
100
-40
-15
10
T
A
(°C)
35
60
85
R
SETI
= 1.5kΩ
100
0
0.010
0.045
0.080
C
CT
(μF)
0.115
0.150
V
BAT
= 3.6V
V
BAT
= 4V
MAX8600/01 toc09
MAX8600/MAX8601
FAST-CHARGE TIME vs. C
CT
700
FAST-CHARGE TIME (MIN)
600
500
400
300
200
MAX8600/01 toc10
1100
800
Pin Description
PIN
MAX8600
1
MAX8601
1, 7
NAME
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 (MAX8601). BAT is high impedance when the IC is disabled.
DC Charge-Current Programming Input. Connect a resistor from SETI to GND to set the
maximum charging current when using the DC input, the prequal current from either input,
and the
CHG
turn-off threshold.
Thermistor Input. Connect a 10kΩ NTC thermistor, in close proximity to the battery, from THM
to ground to monitor the battery temperature. Connect THM to GND to disable the thermistor
functionality. The IC suspends charging when R
THM
is outside the hot and cold limits.
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.
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.
Power-OK Monitor.
POK
is an open-drain output that pulls low when a valid charging source is
detected at either DC or USB (MAX8601).
POK
is high impedance when
EN
is high.
Charging-Status Output.
CHG
goes low when the battery is above 3V and being charged with
a current greater than 7.5% of the current programmed with R
SETI
.
CHG
is high impedance
when the charger is in prequal, top-off, or disabled.
BAT
2
2
SETI
3
3
THM
4
5
6, 7, 9
8
10
4
5
—
8
10
GND
CT
N.C.
EN
POK
11
11
CHG
_______________________________________________________________________________________
5
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