MAX11080GUU+ Maxim Integrated Products, MAX11080GUU+ Datasheet - Page 20

IC LI/BATTERY MANAGEMENT 38TSSOP

MAX11080GUU+

Manufacturer Part Number
MAX11080GUU+
Description
IC LI/BATTERY MANAGEMENT 38TSSOP
Manufacturer
Maxim Integrated Products
Datasheets

Specifications of MAX11080GUU+

Function
Battery Monitor
Battery Type
Lithium-Ion (Li-Ion)
Voltage - Supply
6 V ~ 72 V
Operating Temperature
-40°C ~ 105°C
Mounting Type
Surface Mount
Package / Case
38-TSSOP (0.173", 4.40mm Width)
Product
Charge Management
Operating Supply Voltage
6 V to 72 V
Supply Current
0.05 uA
Maximum Operating Temperature
+ 105 C
Minimum Operating Temperature
- 40 C
Charge Safety Timers
No
Mounting Style
SMD/SMT
Temperature Monitoring
No
Uvlo Start Threshold
1.6 V
Uvlo Stop Threshold
2.8 V
No. Of Batteries
12
Supply Voltage Range
6V To 72V
Battery Ic Case Style
TSSOP
No. Of Pins
38
Operating Temperature Range
-40°C To +105°C
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
12-Channel, High-Voltage
Battery-Pack Fault Monitors
Figure 17. Shutdown Circuit Interface
and then VDD
MAX11081 shut down.
Figure 17 shows the shutdown circuit interface of two
daisy-chain devices.
When SHDN is high for device n, the charge pump is
enabled and begins to charge the capacitors in the
interface circuit. When the voltage of the SHDN pin for
device (n+1) rises above the VIH threshold, that device
begins its power-up sequence. This action propagates
up the daisy-chain until the last battery module is
enabled. Conversely, pulling SHDN to AGND powers
down a module and thus propagates the power-down
to all higher daisy-chained modules as the charge on
their SHDN capacitors is dissipated. The zener diodes
provide additional ESD protection. The filter capacitors
and resistors are sized to provide robust noise immuni-
ty. The diode from the CP+ pin should be S1B or a simi-
lar low-leakage type for high-temperature stability.
The SHDN pin has a weak internal pulldown resistor on
the order of 12MΩ. A 200kΩ or similar resistor from SHDN
to AGND should be installed to ensure that the SHDN pin
is pulled low when the active SHDN signal is propagated
up the daisy-chain bus. The resistor is not needed for
applications that tie SHDN high at all times. The typical
SHDN rising edge propagation time from one daisy-
chained module to the next is 1.5ms.
For FMEA detectability, the SHDN pin is designed to
detect logic transitions that could be indicative of a
short circuit to the ALRM
shown in Figure 18 provides some immunity for rare
glitches at the SHDN pin, such as those during power-
up, that are not a result of a short to ALRM
pin signal is fed as a clock to a 5-bit counter. When the
counter reaches the maximum count of 32, the full flag
is set and acts as a clock to a D flip-flop. When the D
flip-flop is clocked, its output goes high to signal the
FMEA fault condition and trigger the alarm. In this way,
the device goes into the alarm state only after 32 pulses
20
______________________________________________________________________________________
U
. If SHDN < 0.6V, the MAX11080/
DEVICE
(n)
L
pin. The SHDN pin circuit
GND
CP+
U
S1B
5.6V
L
. The SHDN
150I
100nF
1kI
5.6V
Figure 18. Internal FMEA SHDN Pin Functionality Circuit
on the SHDN pin have occurred. To clear the FMEA
fault state, a POR of the device must be activated. The
application circuit should ensure that the SHDN pin is
glitch free and only toggles when a shutdown or power-
down event is intended. This FMEA detection circuit
should not be considered as a provision to filter out
noise or glitches on the SHDN pin.
The C1 input is limited to V
a maximum of 20V if the SHDN pin is asserted. If an
application requires that the 20V restriction be removed
during active shutdown, then a 4.0V zener diode can
be added from V
allows the C1 input to go to V
the SHDN state. It also allows the differential C1 to C0
voltage to range from -0.3V to +80V.
An individual MAX11080/MAX11081 can be connected to
as many as 12 series-connected cells. To accommodate
configurations with fewer cells, unused cell inputs must be
ALRM
SHDN
VAA
U
68nF
COUNTER
5 BIT UP
C1 Input Absolute Maximum Rating
200kI
FULL FLAG
Cell-Connection and Detection
AA
to AGND. This protects V
SHDN
AGND
D
CLK
PORb
RST
DCIN
DEVICE
(n+1)
Q
DCIN
FMEA FLAG
- 0.6V above AGND or
- 0.6V regardless of
INTERNAL ALARM
SIGNAL
AA
ALRM
and
L

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