MAX8601EVKIT Maxim Integrated, MAX8601EVKIT Datasheet - Page 2

• Manufacturer Part Number: MAX8601EVKIT
• Description: Battery Management Evaluation Kit for the MAX8601
• Manufacturer: Maxim Integrated
• Series: MAX8600, MAX8601r

Specifications of MAX8601EVKIT

• Battery Type: Li-Ion, Li-Poly
• Operating Supply Voltage: 4.15 V to 7 V
• Charge Safety Timers: Yes
• Operating Supply Current: 750 uA
• Product Type: Charge Management
• Temperature Monitoring: Yes

If another charge-current level is desired, remove the
shunt and replace R7 with a resistor calculated as follows:
where I
to the MAX8600/MAX8601 IC data sheet for more details.
When using the USB input, charge current is selected
using the USEL input (JU1). Drive USEL low by con-
necting a shunt across JU1 to select 95mA charge cur-
rent. Drive USEL high by removing the shunt from JU1
to select a 475mA charge current.
EN is a logic input (active low) that enables the charg-
er. Drive EN high by connecting a shunt across JU2 to
disable the charger control circuitry. Drive EN low by
removing the shunt from JU2 to enable the MAX8601.
The MAX8601 contains internal timers for prequalified
fast-charge and top-off states. These time periods are
determined by the capacitance from CT to GND (C3).
To set the charge times, calculate C3 as follows:
Note that t
The MAX8601 features a thermal limit that reduces the
charge current when the die temperature exceeds
+100°C. As the temperature increases, the IC lowers
Table 1. Charge States with THM = GND or 3.94kΩ < R
X = Don’t care.
* POK is an open-drain output controlled by V
High
Low
Low
Low
Low
Low
Low
Low
Low
EN
CHARGE(MAX)
C3 = (0.068µF / 334min) x t
PREQUAL
R7 = 1500 / I
CONDITIONS
POK*
High
High
_______________________________________________________________________________________
Low
Low
Low
Low
Low
Low
Low
= t
is in amps and R7 is in ohms. Refer
Timer Capacitor Selection
TOPOFF
CHARGE(MAX)
4.05 < V
3V < V
3V < V
= 1/10 x t
V
BAT
V
< 3V
4.2V
4.2V
BAT
BAT
Thermal Control
BAT
BAT
FASTCHARGE
X
X
< 3V
< 4.2V
< 4.2V
IN
< 4.2V
FASTCHARGE
(V
DC
EN Input
or V
USB
10% of I
> 7.5% I
< 7.5% I
) and EN . If EN is high, POK is high regardless of V
I
I
FAST
BAT
0
0
0
0
0
FAST
FAST
FAST
MAX8601 Evaluation Kit
the charge current by 50mA/°C above +100°C when
I
CHG is an open-drain output that indicates charger sta-
tus. CHG goes low during charge cycles where V
greater than 3V and I
maximum charge current set by R
EV kit uses a red LED to signal charging cycles.
The MAX8601 contains an open-drain FLT output to
signal the user when a fault occurs. FLT goes low when
the prequalified timer expires and the battery voltage
has not exceeded 3V (typ), or when the fast-charge
timer expires and the battery current has not dropped
below 7.5% (typ) of the maximum fast-charge current
set by R
FLT indicator.
The MAX8601 contains an open-drain POK output that
goes low when a valid input source is detected at DC or
USB. A valid input source is one whose voltage exceeds
the rising UVLO threshold of 4V, exceeds the battery
voltage by 255mV, and does not exceed 7.5V. After a
valid input has been established, charging is sustained
with inputs as low as 3.5V as long as the input remains
above the battery by at least 55mV. POK is high imped-
ance when the charger is disabled.
FAST
is set to 1A.
LED
SETI
Off
Off
On
On
Off
Off
Off
Off
Off
THM
. Toggle EN or the input power to clear the
RESULTS
< 28.3kΩ
High
High
High
High
High
High
High
FLT
Low
Low
BAT
is greater than 7.5% of the
Fast-Charging in Controlled
Fast-Charging in Controlled
Timeout in Prequalification
Timeout in Charge Mode
IN
SETI
.
Charging Done
Current Mode
Voltage Mode
Prequal
Top-Off
. The MAX8601
STATE
CHG Output
POK Output
Mode
FLT Output
Off
Off
BAT
is
3