MAX8600AETD+T Maxim Integrated Products, MAX8600AETD+T Datasheet - Page 9

• Manufacturer Part Number: MAX8600AETD+T
• Description: IC BATTERY CHARGER SGL 14TDFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX8600AETD+T

• Function: Charge Management
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 0 V ~ 14 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 14-WFDFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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 tem-
perature limits that result from a wide range of available
thermistor temperature curves. The curves are defined
by the following equation:
where β is the BETA term in Table 1.
Connect THM to GND to disable the temperature-con-
trol function. When R
pause and hold their value.
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 volt-
ages and should be avoided.
The MAX8600A is in a thermally enhanced TDFN pack-
age with an exposed paddle. Connect the exposed pad-
dle 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
OVP Protection and Programmable Charge Timer
R
T
=
R
25
° ×
C
Battery Temperature Control
_______________________________________________________________________________________
THM
e
⎧
⎪
⎨
⎩ ⎪
β
Thermal Considerations
⎡
⎢
⎣
⎛
⎜
⎝
disables charging, all timers
T
+
Capacitor Selection
1
273
Single-Input 1-Cell Li+ Charger with
⎞
⎟
⎠
−
⎛
⎜
⎝
298
1
⎞
⎟
⎠
⎤
⎥
⎦
⎫
⎪
⎬
⎭ ⎪
restricted PCB layouts that are sometimes unavoidable
in compact portable designs. With such non-optimal lay-
outs, the charger still operates, but can reduce charge
current to manage temperature rise.
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 volt-
age drop across the internal pass transistor when
sourcing the desired maximum charging current.
where R
0.25Ω). Failure to meet this requirement results in an
incomplete charge or increased charge time.
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.
TRANSISTOR COUNT: 6838
PROCESS: BiCMOS
V
ON
IN(MIN)
is the input-to-BAT resistance (typically
> 4.2V + I
CHARGE(MAX)
Layout and Bypassing
Chip Information
DC Input Sources
x R
ON
9