max9065euk Maxim Integrated Products, Inc., max9065euk Datasheet - Page 5

• Manufacturer Part Number: max9065euk
• Description: Ultra-small, Low-power, Window Comparator In 4 Ucsp And 5 Sot23
• Manufacturer: Maxim Integrated Products, Inc.

The MAX9065 is an extremely small window compara-
tor designed for compact, low-current applications, fea-
turing a supply current of less than 1µA (max).
At the heart of the MAX9065 are two comparators, a
resistor-divider with a disconnect switch, a 200mV ref-
erence, digital logic circuitry, and an output stage (see
the Typical Operating Circuit ).
The digital logic circuitry and the output stage together
behave like an AND gate. The gate’s inputs are the out-
puts of the two comparators. When either comparator’s
output is low, the output asserts low. When both com-
parator’s outputs are high, the output asserts high.
When power is applied to V
the bottom of the resistor-divider is turned on. The
resistor-divider provides two voltages, V
V
voltage. When the input voltage exceeds 4.2V, V
is greater than 0.2V, causing the output to assert low.
When the input voltage falls below 3.0V, V
LOWER
SOT23
2, 3
1
4
5
Ultra-Small, Low-Power, Window Comparator
PIN
, for comparison with an internal 0.2V reference
UCSP
B1
B2
A2
A1
_______________________________________________________________________________________
NAME
GND
OUT
V
IN
Detailed Description
CC
External Supply Input. Bypass
to ground with a 0.1µF bypass
capacitor.
Ground
Window Comparator Input
Push-Pull Output
CC
Pin Description
, the n-channel FET at
FUNCTION
LOWER
Operation
UPPER
UPPER
is less
and
in 4 UCSP and 5 SOT23
than 0.2V, causing the output also to assert low. With
the input voltage between 3.0V and 4.2V, the output
asserts high, indicating that the input voltage is within
the desired range. Table 1 summarizes the operation of
the MAX9065.
When V
eliminating the resistor-divider as a leakage path for
current.
The MAX9065 is designed specifically to monitor the
voltage on a single lithium battery. Keeping the voltage
on a lithium battery within a tight range is important to
prevent damage to the battery. Specifically, ensuring
that the battery’s voltage neither exceeds 4.2V nor falls
below 3.0V lengthens the lifetime of the battery and
avoids any hazardous battery conditions.
There are four trip points for hysteresis. See Figure 1.
Bypass V
PROCESS: BiCMOS
Table 1. MAX9065 Operation
INPUT VOLTAGE
3.0V < V
CC
V
V
CC
IN
IN
goes to 0V, the n-channel FET is turned off,
> 4.2V
< 3.0V
with a 0.1µF capacitor to ground.
IN
< 4.2V
Power-Supply Considerations
Chip Information
Applications
OUTPUT
High
Low
Low
Hysteresis
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