MAX6437UT+T Maxim Integrated Products, MAX6437UT+T Datasheet - Page 8

• Manufacturer Part Number: MAX6437UT+T
• Description: IC MONITOR BAT LP SOT23-6
• Manufacturer: Maxim Integrated Products

Specifications of MAX6437UT+T

• Function: Battery Monitor
• Battery Type: Alkaline, Li-Ion, NiCd, NiMH
• Voltage - Supply: 1 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-6
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MAX6437UT+T; MAX6437UT+TTR

Low-Power, Single/Dual-Level Battery Monitors
with Hysteresis
device to monitor and operate from direct battery voltage
while interfacing to higher voltage microprocessors.
The MAX6427/MAX6428/MAX6429/MAX6433/MAX6434/
MAX6435 single-output voltage monitors provide a sin-
gle low-battery output, LBO/LBO. The MAX6427/
MAX6428/MAX6429 fixed-threshold parts assert
LBO/LBO when BATT drops below V
MAX6433/MAX6434/MAX6435 adjustable-threshold
parts assert LBO/LBO when the LTHIN input drops
below the V
The MAX6430/MAX6431/MAX6432/MAX6436/MAX6437/
MAX6438 dual-output voltage monitors provide two low-
battery outputs, LBOH/LBOH and LBOL/LBOL. The
MAX6430/MAX6431/MAX6432 fixed-threshold parts
assert LBOH/LBOH when BATT drops below V
and assert LBOL/LBOL when BATT drops below V
The MAX6436/MAX6437/MAX6438 adjustable-thresh-
old parts assert LBOH/LBOH when HTHIN drops below
V
below V
Figure 2. MAX6430/MAX6431/MAX6432 Functional Diagram
8
HTHIN-
_______________________________________________________________________________________
LTHIN-
, and assert LBOL/LBOL when LTHIN drops
LTHIN
(see Figure 6).
threshold (615mV) (see Figure 5).
( ) ARE FOR THE MAX6432
V BATT
615
mV
V BATT
+
-
LTH
. The
HTH-
LTH-
HYSTERESIS SWITCH
HYSTERESIS SWITCH
,
.
The MAX6433–MAX6438 HTHIN and LTHIN inputs are
high-impedance inputs to comparators. An external resis-
tor-divider network is required between the monitored
voltage, HTHIN, LTHIN, and GND to select the desired
thresholds (see Resistor-Value Selection). The
MAX6433/MAX6434/MAX6435 single-output voltage
monitors assert LBO/LBO when LTHIN drops below the
internal LTHIN reference (615mV). LBO/LBO is deassert-
ed when HTHIN rises above the internal HTHIN reference
level (615mV) for at least 140ms (see Figure 6).
The MAX6436/MAX6437/MAX6438 dual-output voltage
monitors assert LBOL/LBOL when LTHIN drops below
the LTHIN- threshold and deassert LBOL/LBOL when
LTHIN rises above the LTHIN+ threshold for at least
140ms. LBOH/LBOH is asserted when HTHIN drops
below the HTHIN- threshold and is deasserted when
HTHIN rises above the HTHIN+ threshold for at least
140ms (see Figure 7).
TIMEOUT
PERIOD
LBO
Threshold Monitoring
LBOH
(LBOH)
LBOL
(LBOL)