Rainbow Electronics MAX920 - Manual

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General Description
The MAX917–MAX920 nanopower comparators in
space-saving SOT23 packages feature Beyond-the-
Rails™ inputs and are guaranteed to operate down to
+1.8V. The MAX917/MAX918 feature an on-board
1.245V ±1.5% reference and draw an ultra-low supply
current of only 750nA, while the MAX919/MAX920 (with-
out reference) require just 380nA of supply current.
These features make the MAX917–MAX920 family of
comparators ideal for all 2-cell battery applications,
including monitoring/management.
The unique design of the output stage limits supply-cur-
rent surges while switching, virtually eliminating the
supply glitches typical of many other comparators. This
design also minimizes overall power consumption
under dynamic conditions. The MAX917/MAX919 have
a push/pull output stage that sinks and sources current.
Large internal output drivers allow Rail-to-Rail
® output
swing with loads up to 8mA. The MAX918/MAX920
have an open-drain output stage that makes them suit-
able for mixed-voltage system design.
Applications
2-Cell Battery Monitoring/Management
Ultra-Low-Power Systems
Mobile Communications
Notebooks and PDAs
Threshold Detectors/Discriminators
Sensing at Ground or Supply Line
Telemetry and Remote Systems
Medical Instruments
Features
♦ Ultra-Low Supply Current
380nA per Comparator (MAX919/MAX920)
750nA per Comparator with Reference
(MAX917/MAX918)
♦ Guaranteed to Operate Down to +1.8V
♦ Internal 1.245V ±1.5% Reference
(MAX917/MAX918)
♦ Input Voltage Range Extends 200mV
Beyond-the-Rails
♦ CMOS Push/Pull Output with ±8mA Drive
Capability (MAX917/MAX919)
♦ Open-Drain Output Versions Available
(MAX918/MAX920)
♦ Crowbar-Current-Free Switching
♦ Internal Hysteresis for Clean Switching
♦ No Phase Reversal for Overdriven Inputs
♦ Space-Saving SOT23 Package
MAX917–MAX920
SOT23, 1.8V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
________________________________________________________________ Maxim Integrated Products 1
V EE
IN- (REF) IN+
1 5 V
CC OUT
MAX917
MAX918
MAX919
MAX920
SOT23-5
TOP VIEW
2
3 4
( ) ARE FOR MAX917/MAX918.
PART
MAX917 EUK-T
MAX917ESA -40°C to +85°C
-40°C to +85°C
TEMP.
RANGE
PIN-
PACKAGE
5 SOT23-5
8 SO
Pin Configurations continue at end of data sheet.
Typical Application Circuit appears at end of data sheet.
Pin Configurations
Selector Guide
Ordering Information
SOT
TOP MARK
ADIQ
—
MAX918 EUK-T
MAX918ESA
ADIR
-40°C to +85°C
-40°C to +85°C 5 SOT23-5
8 SO —
MAX919 EUK-T
MAX919ESA
ADIS
-40°C to +85°C
-40°C to +85°C 5 SOT23-5
8 SO —
MAX920 EUK-T
MAX920ESA
ADIT
-40°C to +85°C
-40°C to +85°C 5 SOT23-5
8 SO —
Open-Drain Yes MAX918 750
380
380
750
SUPPLY
CURRENT
(nA)
Open-Drain No MAX920
PART
Push/Pull No MAX919
Push/Pull Yes MAX917
OUTPUT
TYPE
INTERNAL
REFERENCE
Beyond-the-Rails is a trademark of Maxim Integrated Products.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
19-1512; Rev 0; 7/99