Document
19-1512; Rev 2; 10/10
MAX917–MAX920
SOT23, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference
General Description
The MAX917–MAX920 nanopower comparators in space-saving SOT23 packages feature Beyond-theRails™ 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 (without 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-current 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 suitable 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
Selector Guide
PART
MAX917 MAX918 MAX919 MAX920
INTERNAL REFERENCE
Yes Yes No No
OUTPUT TYPE
Push-Pull Open-Drain
Push-Pull Open-Drain
SUPPLY CURRENT
(nA)
750
750
380 380
Typical Application Circuit appears at end of data sheet.
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
Ordering Information
PART
PIN-PACKAGE
TOP MARK
PKG CODE
MAX917EUK+T 5 SOT23
ADIQ
U5+1
MAX917ESA+
8 SO
— S8+2
MAX918EUK+T 5 SOT23
ADIR
U5+1
MAX918ESA+
8 SO
— S8+2
MAX919EUK+T 5 SOT23
ADIS
U5+1
MAX919EUK/V+T 5 SOT23
AFGP
U5+1
MAX919ESA+
8 SO
— S8+2
MAX920EUK+T 5 SOT23
ADIT
U5+1
MAX920ESA+
8 SO
— S8+2
Note: All devices are specified over the -40°C to +85°C operating temperature range. +Denotes a lead(Pb)-free/RoHS-compliant package. /V denotes an automotive qualified part.
Pin Configurations
TOP VIEW
OUT 1
5 VCC
VEE 2 IN+ 3
MAX917 MAX918 MAX919 MAX920
4 IN- (REF)
Beyond-the-Rails is a trademark of Maxim Integrated Products, Inc.
( ) ARE FOR MAX917/MAX918.
SOT23
Pin Configurations continue at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
MAX917–MAX920
SOT23, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC to VEE)..................................................+6V Voltage Inputs (IN+, IN-, REF) .........(VEE - 0.3V) to (VCC + 0.3V) Current Into Input Pins......................................................±20mA
Output Voltage
MAX917/MAX919 ........................(VEE - 0.3V) to (VCC + 0.3V) MAX918/MAX920 ......................................(VEE - 0.3V) to +6V Output Current..................................................................±50mA
Output Short-Circuit Duration .............................................10sec
Continuous Power Dissipation (TA = +70°C) 5-Pin SOT23 (derate 7.31mW/°C above +70°C).........571mW 8-Pin SO (derate 5.88mW/°C above +70°C)...............471mW
Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C Soldering Temperature (reflow) .......................................+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS—MAX917/MAX918
(VCC = +5V, VEE = 0V, VIN+ = VREF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Supply Voltage Range
VCC Inferred from the PSRR test VCC = 1.8V
1.8.