MAXIM MAX8600AETD+

19-3205; Rev 1; 1/09
KIT
ATION
EVALU
E
L
B
A
IL
AVA
Single-Input 1-Cell Li+ Charger with
OVP Protection and Programmable Charge Timer
The MAX8600A single-input linear battery charger safely charges single-cell Li+ batteries. Charging is optimized for Li+ cells using a control algorithm that
includes low-battery precharging, voltage and currentlimited fast-charging, and top-off charging, while continuously 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 thermal characteristics of a given application. There is no
need to reduce the maximum charge current to accommodate 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 powerenhanced TDFN package.
Applications
Cell Phones
Portable Media Players
Digital Cameras
MP3 Players
PDAs
Wireless Appliances
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
MAX8600AETD+ -40°C to +85°C
PIN-PACKAGE
TOP
MARK
14 TDFN-EP*
(3mm x 3mm)
(T1433-2)
AEF
*EP = Exposed pad.
+Denotes a lead(Pb)-free/RoHS-compliant package.
GPS
Typical Operating Circuit
Pin Configuration
TOP VIEW
SAFE DC
+
BAT
1
14
FLT
SETI
2
13
DC
THM
3
12
DC
GND
4
11
CHG
CT
5
10
POK
N.C.
6
9
DC
BAT
7
8
EN
DC INPUT
4.1V TO 5.9V
DC
POK
LOGIC
SUPPLY
LED
MAX8600A
OFF
EN
ON
MAX8600A
CT
CHG
FLT
BAT
+
SETI
Li+
THM
GND
TDFN
________________________________________________________________ Maxim Integrated Products
For information on other Maxim products, visit Maxim’s website at www.maxim-ic.com.
1
MAX8600A
General Description
MAX8600A
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
(Note 2)
4.1
6.0
V
Input Undervoltage Threshold
When POK goes low, DC rising, 500mV hysteresis
3.89
4.0
4.10
V
Input Overvoltage Threshold
When POK goes high, DC rising, 200mV hysteresis
6.2
6.5
6.8
V
Input Supply Current
IBAT = 0mA, RTHM = 10kΩ
980
2000
µA
Shutdown Input Current
VEN = 5V
275
435
µA
Input to BAT On-Resistance
VDC = 3.7V, VBAT = 3.6V
0.25
0.5
Ω
Input to BAT Dropout Voltage
DC falling, 200mV hysteresis
5
75
150
mV
4.179
4.2
4.221
4.166
4.2
4.234
Input Operating Range
BAT
TA = +25°C
TA = -40°C to +85°C
BAT Regulation Voltage
IBAT = 0mA
BAT Restart Fast-Charge
Threshold
From BAT regulation voltage
-180
-150
-120
RSETI = 1.5kΩ
950
1000
1050
RSETI = 2kΩ
675
750
825
RSETI = 5kΩ
275
300
325
RSETI = 2kΩ, VBAT = 2.0V
67.5
75
82.5
DC Charging Current
Soft-Start Time
Ramp time to fast-charge current
BAT Prequal Threshold
When charging current changes, BAT rising, 170mV
hysteresis
BAT Leakage Current
VDC = 0V, VBAT = 4.2V
1.2
2.30
V
mV
mA
ms
2.50
2.54
V
0.001
5
µA
5.0
kΩ
CONTROL INPUTS AND OUTPUTS
SETI
RSETI Resistance Range
2
Guaranteed by charging current
1.5
_______________________________________________________________________________________
Single-Input 1-Cell Li+ Charger with
OVP Protection and Programmable Charge Timer
(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
1.6
Falling
0.4
Logic Input Resistance to
GND
250
V
485
1000
kΩ
mV
POK
Logic Output Voltage, Low
Logic Output Leakage
Current, High
IPOK = 100µA
VPOK = VDC = 16V
29
100
TA = +25°C
0.001
1
TA = +85°C
0.01
µA
CHG, FLT
Logic Output Voltage, Low
ICHG = IFLT = 1mA
Logic Output Leakage
Current, High
VCHG = VFLT = 5.5V,
VDC = 0V
12
100
TA = +25°C
0.001
1
TA = +85°C
0.01
mV
µA
CHG
CHG/Top-Off Current
Threshold
IBAT falling, battery is
charged
RSETI = 1.5kΩ
RSETI = 2kΩ
60
30
RSETI = 5kΩ
45
60
mA
18
THM
THM Pullup Resistance
Match to thermistor resistance at TA = +25°C
-1%
10
+1%
kΩ
THM Resistance, Hot
RTHM falling, 420Ω hysteresis
3.72
3.94
4.13
kΩ
THM Resistance, Cold
RTHM rising, 2.7kΩ hysteresis
26.7
28.3
29.7
kΩ
THM Resistance, Disabled
RTHM falling, 230Ω hysteresis
240
309
370
Ω
Timer Accuracy
CCT = 0.068µF
-20
+20
%
Prequal Time Limit
From POK low and EN low to end of prequal charge,
BAT < 2.4V, CCT = 0.068µF
TIMERS, CT
34.8
min
Charge Time Limit
From POK low and EN low to end of charge, CCT = 0.068µF
334
min
Top-Off Time Limit
From CHG high to done, CCT = 0.068µF
69.6
min
Thermal-Limit Temperature
Junction temperature when the charge current is reduced,
TJ rising
+100
°C
Thermal-Limit Gain
Reduction of IBAT for increase of TJ, IBAT/TJ (over +100°C)
5
%/°C
THERMAL LOOP
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
MAX8600A
ELECTRICAL CHARACTERISTICS (continued)
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.)
DISABLED SUPPLY CURRENT
vs. INPUT VOLTAGE
400
SUPPLY CURRENT (μA)
800
450
700
600
500
400
300
200
350
300
250
200
150
100
100
4
6
8
10
12
14
2
4
6
8
10
12
RSETI = 3kΩ
400
DASHED DATA TAKEN
WITH PULSE TESTING TO
AVOID THERMAL LIMIT
0
14
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
INPUT VOLTAGE (V)
VBAT (V)
CHARGE CURRENT
vs. INPUT VOLTAGE HEADROOM
CHARGE CURRENT
vs. DC VOLTAGE
RSETI = 2kΩ
800
RSETI = 3kΩ
400
DASHED DATA
TAKEN WITH PULSE
TESTING TO AVOID
THERMAL LIMIT
200
900
800
CHARGE CURRENT (mA)
1000
MAX8600A toc05
RSETI = 1.5kΩ
600
1000
MAX8600A toc04
1200
CHARGE CURRENT (mA)
600
0
0
INPUT VOLTAGE (V)
700
600
500
400
300
200
100
0
0
0
2
4
6
8
10
12
0
14
0.2
0.4
0.6
0.8
VDC (V)
VIN - VBAT (V)
BATTERY REGULATION
VOLTAGE vs. AMBIENT TEMPERATURE
CHARGE CURRENT vs. AMBIENT
TEMPERATURE (750mA CHARGE)
1000
MAX8600A toc06
4.210
4.205
900
4.200
4.195
4.190
VBAT = 4V
800
CHARGE CURRENT (mA)
BATTERY REGULATION VOLTAGE (V)
RSETI = 2kΩ
1.0
MAX8600A toc07
2
800
VEN = 5V
0
0
RSETI = 1.5kΩ
200
50
VEN = 0V
0
1000
CHARGE CURRENT (mA)
900
MAX8600A toc02
500
MAX8600A toc01
1000
CHARGE CURRENT
vs. BATTERY VOLTAGE
MAX8600A toc03
SUPPLY CURRENT vs. INPUT VOLTAGE
SUPPLY CURRENT (μA)
MAX8600A
Single-Input 1-Cell Li+ Charger with
OVP Protection and Programmable Charge Timer
700
600
VBAT = 3.6V
500
400
300
200
4.185
100
0
4.180
-40
-15
10
35
TA (°C)
4
60
85
-40
-15
10
35
60
TA (°C)
_______________________________________________________________________________________
85
Single-Input 1-Cell Li+ Charger with
OVP Protection and Programmable Charge Timer
CHARGE CURRENT vs. AMBIENT
TEMPERATURE (1A CHARGE)
CHARGE CURRENT (mA)
800
VBAT = 3.6V
700
600
500
400
700
300
200
-15
10
35
60
600
500
400
300
200
100
RSETI = 1.5kΩ
100
-40
MAX8600A toc09
900
800
FAST-CHARGE TIME (MIN)
VBAT = 4V
1000
FAST-CHARGE TIME vs. CCT
MAX8600A toc08
1100
0
0.010
85
TA (°C)
0.045
0.080
0.115
0.150
CCT (μF)
Pin Description
PIN
NAME
FUNCTION
1, 7
BAT
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.
2
SETI
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.
3
THM
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.
4
GND
Ground
5
CT
6
N.C.
8
EN
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.
10
POK
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.
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.
_______________________________________________________________________________________
5
MAX8600A
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.)
Single-Input 1-Cell Li+ Charger with
OVP Protection and Programmable Charge Timer
MAX8600A
Pin Description (continued)
PIN
NAME
FUNCTION
11
CHG
9, 12, 13
DC
DC Input Source. Connect directly to a 4.5V to 6.0V charging source. Bypass DC to GND with 1µF or
greater. DC is overvoltage protected to 14V. Ensure that all DC pins are connected together.
14
FLT
Fault Status Output. FLT pin pulls low when the fast-charge or prequal timers expire and the battery
voltage is not above the required threshold. Clear the fault by raising EN or dropping DC to GND (remove
input power).
—
EP
Exposed Pad. Connect EP to the GND plane for optimum thermal dissipation.
Charging-Status Output. CHG pulls low when the battery is above 2.5V and being charged with a current
greater than 6% of the current programmed with RSETI. CHG is high impedance when the charger is in
prequal, top-off, or disabled.
VDC INVALID OR
VDC < VBAT OR
EN HIGH
OFF
POK = MONITORS INPUT
CHG = HIGH, FLT = HIGH
IBAT = 0mA
ANY STATE
EN LOW AND
POK GOOD
SET TIMER = 0s
SUSPEND PQ
POK = LOW, CHG = HIGH,
FLT = HIGH, IBAT = 0mA,
TIMER HALTED
THM OK
THM NOT OK
PREQUAL
POK = LOW, CHG = HIGH, FLT = HIGH
IBAT = 150/RSETI
VBAT < 2.37V
SET TIMER = 0s
SUSPEND FC
POK = LOW, CHG = HIGH,
FLT = HIGH, IBAT = 0mA,
TIMER HALTED
THM OK
THM NOT OK
VBAT > 2.5V
SET TIMER = 0s
FAULT
CHG = HIGH
FLT = LOW
TIMER > 334min
FAST-CHARGE
POK = LOW, CHG = LOW,
FLT = HIGH, VBAT ≤ 4.2V,
IBAT ≤ 1500/RSETI
IBAT < 150/RSETI
AND VBAT < 4.2V
SET TIMER = 0s
NOTE: ALL TIMER VALUES
ARE FOR CCT = 0.068μF
TIMER > 34.8min
IBAT < 90/RSETI
AND VBAT ≥ 4.2V
SET TIMER = 0s
TOP-OFF
POK = LOW, CHG = HIGH,
FLT = HIGH, VBAT ≤ 4.2V
VBAT < 4.1V
SET TIMER = 0s
TIMER > 69.6min
DONE
POK = LOW, CHG = HIGH,
FLT = HIGH, IBAT = 0mA
Figure 1. Charger State Diagram
6
_______________________________________________________________________________________
Single-Input 1-Cell Li+ Charger with
OVP Protection and Programmable Charge Timer
The MAX8600A is a single-cell Li+ battery charger.
Charging is optimized for Li+ cells using a control algorithm that includes low-battery precharging, charging
with simultaneous voltage and current compliance, and
top-off charging. The battery is continuously monitored
for over/under temperature, and charging is suspended
if the temperature is out of range. Charging is also terminated when the input source voltage is greater than
6.5V, or after excess charging time (fault). Charger
timeout protection is programmable. Charger status is
indicated by three-open drain outputs: POK, CHG, and
FLT. An input overvoltage protection circuit prevents
charging from improper input sources.
The MAX8600A reduces charging time by continuously
adjusting the charge rate to accommodate the thermal
characteristics of a given application. There is no need to
reduce the maximum charge current based on worst-case
supply voltage, temperature, and thermal resistance.
DC Charging
The MAX8600A is designed to charge a single-cell Li+
battery from a DC source voltage between 4.1V and
6.0V. The precharge current, charge current, and topoff threshold are programmable with RSETI.
EN Charger-Enable Input
EN is a logic input (active low) that enables the charger.
Drive EN high to disable the charger-control circuitry.
Drive EN low or connect to GND for normal operation.
maximum charge current set by R SETI . When the
MAX8600A is used in conjunction with a microprocessor (µP), connect a pullup resistor between CHG and
the logic I/O voltage to indicate charge status to the µP.
Alternatively, CHG can sink up to 20mA for an LED
charge indicator.
Fault Indicator (FLT)
The MAX8600A contains an open-drain FLT output to
signal the user when a fault occurs. FLT goes low if the
charger is in prequal and the prequal timer expires, or
if the charger is in fast-charge and the fast-charge time
expires. FLT does not go low if the THM thermistor temperature is out of range. Toggle EN or the input power
to reset the FLT indicator.
Power-OK Indicator (POK)
The MAX8600A contains an open-drain POK output
that goes low when a valid input source is detected at
DC. A valid input source is one whose voltage is
between 4.1V and 6.0V and exceeds the battery voltage by 350mV. After a valid input has been established, charging is sustained with inputs as low as 3.5V
as long as the input voltage remains above the battery
voltage by at least 75mV (typ). Figure 2 shows POK
being used to drive an external p-channel MOSFET to
create a node called SAFE DC. SAFE DC is an overvoltage-protected version of DC.
D2
SAFE DC
Soft-Start
To prevent input transients, the rate of change of
charging current is limited. When the charger is turned
on or when the input source is changed, charge current
is ramped from 0 to the set current value in typically
1.2ms. This is done to ensure that the DC source is not
subjected to a severe load current step.
Charge-current ramp-up is also limited when transitioning from prequal to fast-charge. There is no dI/dt limiting, however, if I SET is changed suddenly using a
switch at RSETI.
Thermal-Limit Control
The MAX8600A features a thermal limit that reduces the
charge current when the die temperature exceeds
+100°C. As the temperature increases above +100°C, the
IC lowers the fast-charge current compliance by 5%/°C.
Q1
R1
470kΩ
DC INPUT
4.1V TO 6.0V
DC
C1
1μF
OFF
POK
D1
MAX8600A
R2
100kΩ
EN
ON
CCT
0.068μF
LOGIC
SUPPLY
LED
CT
R3
330Ω
CHG
FLT
BAT
C2
2.2μF
SETI
RSETI
2kΩ
+
Li+
THM
GND
T1
10kΩ AT
+25°C
CHG Charge-Indicator Output
CHG is an open-drain output that indicates charger status. CHG goes low during charge cycles where VBAT is
greater than 2.5V and IBAT is greater than 6% of the
Figure 2. Typical operating circuit. An RSETI of 2kΩ sets a maximum charge current of 750mA.
_______________________________________________________________________________________
7
MAX8600A
Detailed Description
MAX8600A
Single-Input 1-Cell Li+ Charger with
OVP Protection and Programmable Charge Timer
Figure 2 External Components List
COMPONENT
FUNCTION
C1
Filter capacitor
DESCRIPTION
1µF ceramic capacitor
C2
Filter capacitor
2.2µF ceramic capacitor
CCT
Timing capacitor
0.068µF low TC ceramic capacitor
RSETI
DC charge-current program resistor
2kΩ 1% (for 750mA charge)
R1
Pullup resistor
470kΩ
R2
Pullup resistor
100kΩ
R3
LED current program resistor
330Ω
T1
Negative TC thermistor
Phillips NTC thermistor,
P/N 2322-640-63103,
10kΩ 5% at +25°C
D1
Charge indicator LED
LED
Table 1. Fault Temperatures for Different Thermistors
THERMISTOR BETA
3000
3250
3500
3750
Resistance at +25°C
10,000Ω
10,000Ω
10,000Ω
10,000Ω
Resistance at +50°C
4587.78Ω
4299.35Ω
4029.06Ω
3775.75Ω
25,140.55Ω
27,148.09Ω
29,315.94Ω
31,656.90Ω
Nominal Hot Trip Temperature
+55.14°C
+52.60°C
+50.46°C
+48.63°C
Nominal Cold Trip Temperature
-3.24°C
-1.26°C
+0.46°C
+1.97°C
Resistance at 0°C
Applications Information
Figure 2 shows the typical operating circuit for the
MAX8600A. The following section describes component
changes for different charging current and timer durations.
Also, the top-off charge-current threshold is set to 6% of
the fast-charge current set by RSETI.
IPREQUAL = 150/RSETI
ITOP-OFF = 90/RSETI
Charge-Current Selection
The maximum charging current is programmed by an
external resistor (RSETI) connected from SETI to GND.
Calculate the RSETI value as follows:
RSETI = 1500/ICHARGE(MAX)
where ICHARGE(MAX) is in amps and RSETI is in ohms.
SETI can also be used to monitor the actual chargecurrent level. The output voltage at SETI is proportional
to the charging current as follows:
VSETI = (ICHARGE x RSETI)/1000
Timer Capacitor Selection
The MAX8600A contains timers for prequal, fastcharge, and top-off operation. These time periods are
determined by the capacitance from CT to GND. To set
the charge times, calculate CCT as follows:
TFASTCHARGE = 334min x (CCT/0.068µF)
TPREQUAL = 34.8min x (CCT/0.068µF)
TTOPOFF = 69.6min x (CCT/0.068µF)
Note that when THM halts charging, the timers stop and
hold their value.
Note that the prequal charge current (when VBAT < 2.5V)
operation is 10% of the fast-charge current set by RSETI.
8
_______________________________________________________________________________________
Single-Input 1-Cell Li+ Charger with
OVP Protection and Programmable Charge Timer
⎧⎪ ⎡⎛
1 ⎞ ⎛ 1 ⎞ ⎤ ⎫⎪
⎟ −⎜
⎟ ⎥⎬
⎨β ⎢⎜
⎝
⎠ ⎝ 298 ⎠ ⎦ ⎭⎪
RT = R25°C × e⎩⎪ ⎣ T + 273
where β is the BETA term in Table 1.
Connect THM to GND to disable the temperature-control function. When RTHM disables charging, all timers
pause and hold their value.
Capacitor Selection
restricted PCB layouts that are sometimes unavoidable
in compact portable designs. With such non-optimal layouts, the charger still operates, but can reduce charge
current to manage temperature rise.
DC Input Sources
The MAX8600A operating input voltage range is 4.1V to
6.0V. The device survives input voltages up to 16V
without damage to the IC. If the input voltage is greater
than 6.5V (typ), the IC stops charging. An appropriate
power supply must provide at least 4.2V plus the voltage drop across the internal pass transistor when
sourcing the desired maximum charging current.
VIN(MIN) > 4.2V + ICHARGE(MAX) x RON
where RON is the input-to-BAT resistance (typically
0.25Ω). Failure to meet this requirement results in an
incomplete charge or increased charge time.
Layout and Bypassing
Connect a 2.2µF ceramic capacitor from BAT to GND
for proper stability. Connect a 1µF ceramic capacitor
from DC to GND. Use a larger input bypass capacitor
for high charging currents to reduce supply noise. All
capacitors should be X5R dielectric or better. Be aware
that some capacitors have large voltage coefficients
that reduce actual capacitance at higher operating voltages and should be avoided.
Connect the input capacitors as close as possible to the
device. Provide a large copper GND plane to allow the
exposed paddle to sink heat away from the device.
Connect the battery to BAT as close as possible to the
IC to provide accurate battery voltage sensing. Make all
high-current traces short and wide to minimize voltage
drops. For an example layout, refer to the MAX8600A
Evaluation Kit.
Thermal Considerations
Chip Information
The MAX8600A is in a thermally enhanced TDFN package with an exposed paddle. Connect the exposed paddle of the package to a large copper ground plane to
provide a thermal contact between the device and the
circuit board. The exposed paddle transfers heat away
from the device, allowing the IC to charge the battery
with maximum current, while minimizing the increase in
die temperature. Note that the MAX8600A’s thermal-limit
control allows the charger to be tolerant of thermally
TRANSISTOR COUNT: 6838
PROCESS: BiCMOS
_______________________________________________________________________________________
9
MAX8600A
Battery Temperature Control
The MAX8600A monitors battery temperature through a
negative TC thermistor. Select a thermistor resistance
that is 10kΩ at +25°C and has a beta of 3500. The IC
suspends charging when it is greater than 28.3kΩ or
less than 3.94kΩ, which translates to a temperature
limit of 0°C to +50°C. Table 1 shows the nominal temperature limits that result from a wide range of available
thermistor temperature curves. The curves are defined
by the following equation:
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
PACKAGE TYPE
PACKAGE CODE
DOCUMENT NO.
14 TDFN-EP
T1433-2
21-0137
6, 8, &10L, DFN THIN.EPS
MAX8600A
Single-Input 1-Cell Li+ Charger with
OVP Protection and Programmable Charge Timer
10
______________________________________________________________________________________
Single-Input 1-Cell Li+ Charger with
OVP Protection and Programmable Charge Timer
COMMON DIMENSIONS
PACKAGE VARIATIONS
SYMBOL
MIN.
MAX.
PKG. CODE
N
D2
E2
e
JEDEC SPEC
b
[(N/2)-1] x e
A
0.70
0.80
T633-2
6
1.50±0.10
2.30±0.10
0.95 BSC
MO229 / WEEA
0.40±0.05
1.90 REF
D
2.90
3.10
T833-2
8
1.50±0.10
2.30±0.10
0.65 BSC
MO229 / WEEC
0.30±0.05
1.95 REF
E
2.90
3.10
T833-3
8
1.50±0.10
2.30±0.10
0.65 BSC
MO229 / WEEC
0.30±0.05
1.95 REF
A1
0.00
0.05
T1033-1
10
1.50±0.10
2.30±0.10
0.50 BSC
MO229 / WEED-3
0.25±0.05
2.00 REF
L
0.20
0.40
T1033-2
10
1.50±0.10
2.30±0.10
0.50 BSC
MO229 / WEED-3
0.25±0.05
2.00 REF
k
0.25 MIN.
T1433-1
14
1.70±0.10
2.30±0.10
0.40 BSC
----
0.20±0.05
2.40 REF
A2
0.20 REF.
T1433-2
14
1.70±0.10
2.30±0.10
0.40 BSC
----
0.20±0.05
2.40 REF
______________________________________________________________________________________
11
MAX8600A
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
MAX8600A
Single-Input 1-Cell Li+ Charger with
OVP Protection and Programmable Charge Timer
Revision History
REVISION
NUMBER
REVISION
DATE
DESCRIPTION
0
1/08
Initial release
1
1/09
Corrected various errors
PAGES
CHANGED
—
1–4, 6, 7
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
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