MAX6775 MAXIM [Maxim Integrated Products], MAX6775 Datasheet - Page 6

• Manufacturer Part Number: MAX6775
• Description: Low-Power, 1%-Accurate Battery Monitors in uDFN and SC70 Packages
• Manufacturer: MAXIM [Maxim Integrated Products]

These battery monitors have an active-low output that
asserts when the input falls below a set voltage. They
also offer hysteresis for noise immunity, and to remove
the possibility of output chatter due to battery terminal
voltage recovery after load removal. They are available
with one or two monitors per package, with push-pull or
open-drain outputs, and with internally set or externally
adjustable hysteresis (dual-channel devices offer only
internally fixed hysteresis). Figures 1, 2, and 3 show
block diagrams and typical connections. See the
Selector Guide for details.
All devices are offered with either push-pull or open-
drain outputs (see the Selector Guide). The MAX6781
has one push-pull output and one open-drain output,
configured as in
On all devices with open-drain outputs an external
pullup resistor is required. The open-drain pullup resis-
tor can connect to an external voltage up to +6V,
regardless of the voltage at BATT.
Table 1. MAX6781 Outputs
Low-Power, 1%-Accurate Battery
Monitors in µDFN and SC70 Packages
Figure 1. Single-Channel Fixed-Hysteresis Block Diagram
6
R
R
_______________________________________________________________________________________
H
L
V
MAX6781
BATT
DEVICE
LBI
GND
Table 1.
V
HYSTERESIS
REF
CONTROL
Detailed Description
Push-Pull
LBO1
MAX6775
MAX6776
1
0
Low-Battery Output
BATT
Open-Drain
LBO2
LBO
Figure 2. Dual-Channel Fixed-Hysteresis Block Diagram
Figure 3. Single-Channel Adjustable-Hysteresis Block Diagram
V
BATT
R
HYST
R
R
H
L
V
LBI1
LBI2
BATT
HYSTERESIS
CONTROL
LBH
LBL
GND
V
REF
1
0
MAX6779
MAX6780
MAX6781
MAX6777
MAX6778
GND
1
0
0
1
V
BATT
REF
BATT
LBO
LBO1
LBO2