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MAX1614
High-Side, n-Channel MOSFET
Switch Driver
Simple Low-Battery Disconnect/Fresh
Battery Reconnect Circuit
A simple undervoltage disconnect circuit is often desir-
able to prevent damage to secondary batteries due to
repeated deep discharge or cell reversal. The Typical
SHUTDOWN
(CMOS OR TTL LOGIC)
OFF
MAX1614
Operating Circuit turns off the MAX1614, disconnecting
the battery from the load when the battery voltage
falls below the minimum battery voltage required,
(V LOW BATT ). V LOW BATT = (R1 + R2)/R2 x V TH where
V TH is the LBI input threshold (1.20V typ). When fresh
cells are installed or the batteries are recharged, a μC
GND
Figure 2. Single-Line Shutdown Control
ON
or pushbutton reconnects the load.
Using LBO to Generate Early
Power-Fail Interrupt
Many applications require an early warning indicating
that power is failing so that the microprocessor (μP)
can take care of any “housekeeping” functions (storing
current settings in memory, etc.) before the power fails.
Connect LBI through a resistor divider across the bat-
N
N
LOAD
tery, and connect LBO to the μP nonmaskable interrupt
(NMI). Set the threshold so that LBO goes low when the
battery decays to a point where regulation begins to
degrade (Figure 4). V LOW BATT = (R1 + R2)/R2 x V TH,
where V TH is the LBI input threshold (1.20V typ). Once
GATE
SRC
ON
housekeeping is complete, the μP can turn off the load
by pulling OFF low.
BATT
MAX1614
OFF
TO μC
R1
LBI
LBO
N
N
LOAD
R2
GND
GATE
SRC
Figure 3. Single-Pushbutton On/Off Control
ON
TO μC
On/Off Control with a
BATT
MAX1614
OFF
PORT PINS
Single Pushbutton Switch
The MAX1614’s separate on and off inputs allow maxi-
mum flexibility in controlling the external MOSFETs.
R1
LBI
LBO
TO μC
NONMASKABLE
INTERRUPT
Connect a pushbutton switch to the ON pin and micro-
controller (μC) I/O for single-button control. Connect the
OFF pin to another μC I/O pin. On the first button
depression, the MAX1614 turns on automatically; the
signal is also detected by the μC. When the button is
depressed a second time, the μC wraps around and
turns off the MAX1614 by pulling low on the OFF pin
(Figure 3).
Maxim Integrated
R2
GND
Figure 4. Using LBO to Generate Early Power-Fail Interrupt
7
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