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PDF MAX9119EXK Data sheet ( Hoja de datos )
| Número de pieza | MAX9119EXK | |
| Descripción | SC70 / 1.8V / Nanopower / Beyond-the-Rails Comparators With/Without Reference | |
| Fabricantes | Maxim Integrated | |
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19-1862; Rev 2; 8/02
SC70, 1.8V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
General Description
The MAX9117–MAX9120 nanopower comparators in
space-saving SC70 packages feature Beyond-the-
Rails™ inputs and are guaranteed to operate down to
+1.8V. The MAX9117/MAX9118 feature an on-board
1.252V ±1.75% reference and draw an ultra-low supply
current of only 600nA, while the MAX9119/MAX9120
(without reference) require just 350nA of supply current.
These features make the MAX9117–MAX9120 family of
comparators ideal for all 2-cell battery-monitoring/man-
agement applications.
The unique design of the output stage limits supply-cur-
rent surges while switching, virtually eliminating the sup-
ply glitches typical of many other comparators. This
design also minimizes overall power consumption under
dynamic conditions. The MAX9117/MAX9119 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 5mA. The MAX9118/MAX9120
have an open-drain output stage that makes them suit-
able for mixed-voltage system design. All devices are
available in the ultra-small 5-pin SC70 package.
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
MAX9117
MAX9118
MAX9119
MAX9120
INTERNAL
REFERENCE
Yes
Yes
No
No
OUTPUT
TYPE
Push-Pull
Open-Drain
Push-Pull
Open-Drain
SUPPLY
CURRENT
(nA)
600
600
350
350
Typical Application Circuit appears at end of data sheet.
Beyond-the-Rails is a trademark of Maxim Integrated Products, Inc.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
Features
o Space-Saving SC70 Package (Half the Size of
SOT23)
o Ultra-Low Supply Current
350nA Per Comparator (MAX9119/MAX9120)
600nA Per Comparator with Reference
(MAX9117/MAX9118)
o Guaranteed to Operate Down to +1.8V
o Internal 1.252V ±1.75% Reference
(MAX9117/MAX9118)
o Input Voltage Range Extends 200mV
Beyond-the-Rails
o CMOS Push-Pull Output with ±5mA Drive
Capability (MAX9117/MAX9119)
o Open-Drain Output Versions Available
(MAX9118/MAX9120)
o Crowbar-Current-Free Switching
o Internal Hysteresis for Clean Switching
o No Phase Reversal for Overdriven Inputs
Ordering Information
PART
TEMP
RANGE
PIN-
PACKAGE
MAX9117EXK-T
MAX9118EXK-T
MAX9119EXK-T
MAX9120EXK-T
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
5 SC70-5
5 SC70-5
5 SC70-5
5 SC70-5
TOP
MARK
ABW
ABX
ABY
ABZ
TOP VIEW
Pin Configurations
OUT 1
5 VCC
VEE 2
IN+ 3
MAX9117
MAX9118
MAX9119
MAX9120
4 IN- (REF)
( ) ARE FOR MAX9117/MAX9118.
SC70
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
SC70, 1.8V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
Typical Operating Characteristics
(VCC = +5V, VEE = 0V, CL = 15pF, VOVERDRIVE = 100mV, TA = +25°C, unless otherwise noted.)
MAX9117/MAX9118 SUPPLY CURRENT
vs. SUPPLY VOLTAGE AND TEMPERATURE
950
900
850 TA = +85°C
800
750 TA = +25°C
700
650
600 TA = -40°C
550
500
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
MAX9119/MAX9120 SUPPLY CURRENT
vs. SUPPLY VOLTAGE AND TEMPERATURE
550
500
TA = +85°C
450
400 TA = +25°C
350
TA = -40°C
300
250
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
MAX9117/MAX9118
SUPPLY CURRENT vs. TEMPERATURE
900
850
800 VCC = +5V
750
VCC = +3V
700
650
VCC = +1.8V
600
550
-40
-15 10 35 60
TEMPERATURE (°C)
85
MAX9119/MAX9120
SUPPLY CURRENT vs. TEMPERATURE
550
MAX9117/MAX9118 SUPPLY CURRENT
vs. OUTPUT TRANSITION FREQUENCY
35
MAX9119/MAX9120 SUPPLY CURRENT
vs. OUTPUT TRANSITION FREQUENCY
35
500
VCC = +3V
450 VCC = +5V
400
350
300
250
-40
VCC = +1.8V
-15 10 35 60
TEMPERATURE (°C)
85
30
25 VCC = +1.8V
20
VCC = +5V
15
10 VCC = +3V
5
0
1
10 100 1k 10k 100k
OUTPUT TRANSITION FREQUENCY (Hz)
30
25 VCC = +1.8V
20
VCC = +5V
15
10 VCC = +3V
5
0
1
10 100 1k 10k 100k
OUTPUT TRANSITION FREQUENCY (Hz)
OUTPUT VOLTAGE LOW
vs. SINK CURRENT
700
OUTPUT VOLTAGE LOW vs. SINK CURRENT
AND TEMPERATURE
600
MAX9117/MAX9119 OUTPUT VOLTAGE
HIGH vs. SOURCE CURRENT
0.7
600
500
VCC = +1.8V
400
VCC = +3V
300
200
100 VCC = +5V
0
0 1 2 3 4 5 6 7 8 9 10
SINK CURRENT (mA)
500
400 TA = +25°C
300 TA = +85°C
200
100 TA = -40°C
0
0 1 2 3 4 5 6 7 8 9 10
SINK CURRENT (mA)
0.6
0.5
0.4 VCC = +1.8V
0.3
VCC = +3V
0.2
VCC = +5V
0.1
0
0 1 2 3 4 5 6 7 8 9 10
SOURCE CURRENT (mA)
_______________________________________________________________________________________ 5
5 Page 
SC70, 1.8V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
IN+
VTHR
IN-
VTHF
VHB
THRESHOLDS
HYSTERESIS
BAND
OUT
VCC
R3
R1
VIN
R2
VREF
VCC
OUT
VEE
MAX9117
MAX9119
Figure 2. Threshold Hysteresis Band
MAX9117 (VREF = 1.252V) and VCC = +5V, and if
we choose IR3 = 1µA, then the two resistor values
are 1.2MΩ and 3.8MΩ. Choose a 1.2MΩ standard
value for R3.
2) Choose the hysteresis band required (VHB). For this
example, choose 50mV.
3) Calculate R1 according to the following equation:
R1 = R3 (VHB / VCC)
For this example, insert the values:
R1 = 1.2MΩ (50mV / 5V) = 12kΩ
4) Choose the trip point for VIN rising (VTHR) such that
VTHR > VREF ✕ (R1 + R3) / R3, (VTHF is the trip point
for VIN falling). This is the threshold voltage at which
the comparator switches its output from low to high
as VIN rises above the trip point. For this example,
choose 3V.
5) Calculate R2 as follows:
R2 = 1 / [VTHR / (VREF ✕ R1) - (1 / R1) - (1 / R3)]
R2 = 1 / [3.0V / (1.2V ✕ 12kΩ) - (1 / 12kΩ) -
(1 / 1.2MΩ)] = 8.05kΩ
For this example, choose an 8.2kΩ standard value.
6) Verify the trip voltages and hysteresis as follows:
VIN rising: VTHR = VREF ✕ R1 [(1 / R1) + (1 / R2)
+ (1 / R3)]
VIN falling: VTHF = VTHR - (R1 ✕ VCC / R3)
Hysteresis = VTHR - VTHF
Additional Hysteresis (MAX9118/MAX9120)
The MAX9118/MAX9120 have a 4mV internal hysteresis
band. They have open-drain outputs and require an
Figure 3. MAX9117/MAX9119 Additional Hysteresis
external pullup resistor (Figure 4). Additional hysteresis
can be generated using positive feedback, but the for-
mulas differ slightly from those of the MAX9117/
MAX9119. Use the following procedure to calculate
resistor values.
1) Select R3 according to the formulas R3 = VREF / 1µA
or R3 = (VCC - VREF) / 1µA - R4. Use the smaller of
the two resulting resistor values.
2) Choose the hysteresis band required (VHB).
3) Calculate R1 according to the following equation:
R1 = (R3 + R4) (VHB / VCC)
4) Choose the trip point for VIN rising (VTHR) (VTHF is
the trip point for VIN falling). This is the threshold
voltage at which the comparator switches its output
from low to high as VIN rises above the trip point.
5) Calculate R2 as follows:
R2 = 1 VTHR (VREF
×
R1) −
1
R1
−
1
R3
6) Verify the trip voltages and hysteresis as follows:
VIN rising:
VTHR = VREF
×
R1
1
+
1
+
1
R1 R2 R3
VIN falling:
VTHF
=
VREF
×
R1
1
R1
+
1
R2
+
R3
1
+ R4
−
R3
R1
+
R4
×
VCC
Hysteresis = VTHR - VTHF
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MAX9119EXK.PDF ] | |
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