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PDF MAX44268EWL Data sheet ( Hoja de datos )
| Número de pieza | MAX44268EWL | |
| Descripción | Low-Power Dual Comparator | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-6144; Rev 0; 12/11
EVALUATION KIT AVAILABLE
MAX44268
1.3mm x 1.3mm, Low-Power
Dual Comparator with Reference
General Description
The MAX44268 is an ultra-small and low-power dual
comparator ideal for battery-powered applications such
as cell phones, notebooks, and portable medical devices
that have extremely aggressive board space and power
constraints. The comparator is available in a miniature
1.3mm x 1.3mm, 9-bump WLP package, making it the
industry’s smallest dual comparator.
The IC can be powered from supply rails as low as 1.8V
and up to 5.5V. It also features a 1.236V ±1% reference
and a 0.7µA typical supply current per comparator. It has
a rail-to-rail input structure and a unique output stage that
limits supply current surges while switching. This design
also minimizes overall power consumption under dynam-
ic conditions. The IC has open-drain outputs, making it
suitable for mixed voltage systems. The IC also features
internal filtering to provide high RF immunity. It operates
over a -40°C to +85°C temperature.
Applications
Smartphones
Notebooks
Two-Cell Battery-Powered Devices
Battery-Operated Sensors
Ultra-Low-Power Systems
Portable Medical Mobile Accessories
Features
S Ultra-Low Power Consumption
0.7µA per Comparator
S Ultra-Small 1.3mm x 1.3mm WLP Package
S Internal 1.236V ±1% Reference
S Guaranteed Operation Down to VCC = 1.8V
S Input Common-Mode Voltage Range Extends
200mV Beyond-the-Rails
S 6V Tolerant Inputs Independent of Supply
S Open-Drain Outputs
S Internal Filters Enhance RF Immunity
S Crowbar-Current-Free Switching
S Internal Hysteresis for Clean Switching
S No Output Phase Reversal for Overdriven Inputs
Ordering Information appears at end of data sheet.
For related parts and recommended products to use with this part,
refer to www.maxim-ic.com/MAX44268.related.
Typical Application Circuit
VIN
R3
INA+
5V
VCC
MAX44268
REF/INA-
R2
INB+
INB-
R1
GND
OUTA
POWER-
GOOD
OUTB
����������������������������������������������������������������� 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.
1 page  
MAX44268
1.3mm x 1.3mm, Low-Power
Dual Comparator with Reference
Typical Operating Characteristics (continued)
(VCC = 5V, VGND = 0V, VIN- = VIN+ = 1.236V, RPULLUP = 100kΩ to VCC, TA = -40NC to +85NC. Typical values are at TA = +25NC, unless
otherwise noted. All devices are 100% production tested at TA = +25NC. Temperature limits are guaranteed by design.)
INPUT OFFSET VOLTAGE HISTOGRAM
45
LEAKAGE CURRENT vs. TEMPERATURE
PROPAGATION DELAY
vs. PULLUP RESISTANCE
0.50 120
40
35
30
25
20
15
10
5
0
-2 -1.5 -1.0 -0.5 0 0.5 1.0 1.5 2.0 2.5
INPUT OFFSET VOLTAGE (mV)
PROPAGATION DELAY
vs. CAPACITIVE LOAD
100
0.45
0.40 100
0.35 80
0.30 tPLH
0.25 60
0.20 VCC = 5V VCC = 2.7V
0.15
40
0.10 20 tPHL
0.05 VCC = 1.8V
0
-50 -30 -10 10 30 50 70 90 110
0
1k 10k 100k 1M
TEMPERATURE (°C)
PULLUP RESISTANCE (I)
PROPAGATION DELAY vs. TEMPERATURE
(VOVERDRIVE = 100mV, VDD = 5V)
45
10M
90
80 tPLH
70
60
50
40
30
20 tPHL
40
35
30
25 tPLH
20
15 tPHL
10
10 5
0
0 200 400 600 800 1000
CAPACITIVE LOAD (pF)
0
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
PROPAGATION DELAY
vs. INPUT OVERDRIVE (tPLH)
60
PROPAGATION DELAY
vs. INPUT OVERDRIVE (tPLH)
12
50
TA = -40°C
TA = +25°C
40
10
8 TA = -40°C
30
20 TA = +85°C
6 TA = +25°C
4
10
0
0
200 400 600 800
INPUT OVERDRIVE VOLTAGE (mV)
1000
2
TA = +85°C
0
0 200 400 600 800 1000
INPUT OVERDRIVE VOLTAGE (mV)
����������������������������������������������������������������� Maxim Integrated Products 5
5 Page 
MAX44268
1.3mm x 1.3mm, Low-Power
Dual Comparator with Reference
Power-On-Reset Circuit
The IC can be used to make a power-on-reset circuit as
displayed in Figure 5. The negative input provides the
ratiometric reference with respect to the power supply
and is created by a simple resistive divider. Choose
reasonably large values to minimize the power consump-
tion in the resistive divider. The positive input provides
the power-on delay time set by the time constant of the
RC circuit formed by R2 and C1. This simple circuit can
be used to power up the system in a known state after
ensuring that the power supply is stable. Diode D1 pro-
vides a rapid reset in the event of unexpected power loss.
If using comparator A, R3 and R4 are not populated and
REF settles in approximately 100µs.
Relaxation Oscillator
The IC can also be used to make a simple relaxation
oscillator (Figure 6) using comparator B. By adding the
RC circuit R5 and C1, a standard Schmidt Trigger circuit
referenced to a set voltage is converted into an astable
VCC
MAX44268
VIN
VPULL
R1
OUT
VREF
multivibrator. As shown in Figure 7, IN- is a sawtooth
waveform with capacitor C1 alternately charging and
discharging through resistor R5. The external hysteresis
network formed by R1 to R4 defines the trip voltages as:
VT
_RISE
=
VCC
R2R3
R3 x R4
+ R2R4 +
R3R4
R4R5(R1+ R2 + R3)
V T _FALL
=
VCC
R4R5
(R1
+ R1R3R4
+ R2 + R3)
+
R1R3R4
+ R2(R1R3 + R3R5 + R1R5)
Using the basic time domain equations for the charging
and discharging of an RC circuit, the logic-high time,
logic-low time, and frequency can be calculated as:
tLOW
=
R5C1
ln
V T _FALL
V T _RISE
Since the comparator’s output is open drain, it goes to
high impedance corresponding to logic-high. So, when
the output is at logic-high, the C1 capacitor charges
through the resistor network formed by R1 to R5. An
accurate calculation of tHIGH would have involved
applying thevenin’s theorem to compute the equivalent
thevenin voltage (VTHEVENIN) and thevenin resistance
GND
Figure 4. Logic-Level Translator
VCC VCC
D1 R2
R3
MAX44268
R1
RESET
R4 C1
GND
VCC
R2
R4
C1
VCC
R3
MAX44268
OUT
GND
R5
R1
Figure 5. Power-On Reset Circuit
Figure 6. Relaxation Oscillator
���������������������������������������������������������������� Maxim Integrated Products 11
11 Page | ||
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