MAX8677AEVKIT+ Maxim Integrated, MAX8677AEVKIT+ Datasheet
MAX8677AEVKIT+
Manufacturer Part Number
MAX8677AEVKIT+
Description
Battery Management MAX8677A Evaluation Kit
Manufacturer
Maxim Integrated
Series
MAX8677Ar
Datasheet
1.MAX8677AEVKIT.pdf
(4 pages)
Specifications of MAX8677AEVKIT+
Battery Type
Li-Ion, Li-Poly
Operating Supply Voltage
4.1 V to 6.6 V
Charge Safety Timers
Yes
Operating Supply Current
1 mA
Temperature Monitoring
Yes
Table 2. Input Limiter Control Logic
6) Verify that the voltage at SYS is approximately 5V.
7) If V
8) Increase the load current on SYS to 1A.
9) Verify that the charge current into the battery
10) Increase the load current on SYS to 1.5A.
11) Verify that the charge current into the battery is near
12) Increase the load current on SYS to 2.5A.
13) Verify that current out of the battery is near 0.5A.
Follow the steps below to ensure that the EV kit is con-
figured for operation in a specific application circuit:
1) Verify that the EV kit DC input current-limit setting is
2) If necessary, replace R6 in the EV kit such that the
3) Verify that the USB source can supply 100mA or
4) Verify the maximum charge-current rating or
5) Ensure that the charge-current setting of the EV kit
* Charge current cannot exceed the input current limit. Charge may be less than the maximum charge current if the total SYS load
exceeds the input current limit.
x = Don’t care.
AC adapter at DC input
USB power at DC input
USB power at USB input,
DC unconnected
DC and USB unconnected
from BATT+ into the battery is approximately 1A.
remains near 1A.
0.5A.
less than the AC adapter source current limit.
DC input current is less than or equal to the AC
adapter output-current capability.
500mA.
desired charge-current rating of the battery.
does not exceed the battery rating, or replace resistor
R7 as required. See the Adjusting Input Current Limit
and Charge-Current Limit section for more details.
POWER SOURCE
BAT
is less than 4.05V, verify that the current
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Detailed Description
Adjusting the EV Kit for
DOK
H
H
H
H
L
L
L
L
In-Circuit Evaluation
UOK PEN1 PEN2 USUS
H
x
x
x
x
L
L
L
H
L
L
L
x
x
x
x
H
H
L
X
L
x
x
x
MAX8677A Evaluation Kit
H
H
L
L
L
L
x
x
CURRENT LIMIT
The input and charge current limits are set, as shown in
Table 2. It is often preferable to change the input cur-
rent limit as the input power source is changed. The
MAX8677A facilitates this by allowing different input
current limits for DC and USB inputs.
When the input current limit is reached, the first action
taken by the MAX8677A is to reduce battery-charge
current. This allows the SYS regulator to stay in drop-
out, or at 5.3V, during heavy loads, thus reducing power
dissipation. If, after the charge current is reduced to
0mA, the load at SYS still exceeds the input current limit,
the SYS voltage starts falling. When the SYS voltage
drops to BAT, the SYS-to-BAT switch turns on, using
battery power to support the system load during the
load peak.
The MAX8677A features flexible input connections (at
the DC and USB input pins) and current-limit settings
(set by PEN1, PEN2, PSET, and ISET) to accommodate
nearly any input power configuration. However, it is
expected that most systems use one of two external
power schemes: separate connections for USB and an
AC adapter, or a single connector that accepts either
USB or the AC adapter output. Input and charge-
current limits are controlled by PEN1, PEN2, R
and R
When CEN is low, the charger is on. When CEN is high,
the charger turns off. CEN does not affect the SYS out-
put. In many systems there is no need for the system
controller (typically a microprocessor) to disable the
charger, because the MAX8677A Smart Power Selector
circuitry independently manages charging and
adapter/battery power hand-off. In these situations,
CEN may be connected to ground.
USB suspend
No DC input
DC INPUT
3000/R6
100mA
500mA
ISET
, as shown in Table 2.
CURRENT LIMIT
USB input off. DC
Adjusting Input Current Limit
input has priority.
USB suspend
No USB input
USB INPUT
100mA
500mA
and Charge-Current Limit
Charge Enable ( CEN )
MAXIMUM CHARGE
CURRENT*
3000/R7
3000/R7
100mA
500mA
0
0
0
PSET
3
,
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MAX8677AEVKIT+ Summary of contents
Page 1
Verify that the voltage at SYS is approximately 5V less than 4.05V, verify that the current BAT from BATT+ into the battery is approximately 1A. 8) Increase the load current on SYS to 1A. 9) ...
Page 2
MAX8677A Evaluation Kit Charge Termination When the charge current falls to the termination thresh- old AND the charger is in voltage mode, charging is complete. Charging continues for a brief 15s top-off period and then enters the DONE state where ...
Page 3
Figure 3. MAX8677A EV Kit Component Placement Guide— Component Side Figure 5. MAX8677A EV Kit PCB Layout—Layer ...
Page 4
... 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. 6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2007 Maxim Integrated Products Figure 7. MAX8677A EV Kit PCB Layout— ...