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PDF MAX44269 Data sheet ( Hoja de datos )
| Número de pieza | MAX44269 | |
| Descripción | Dual Comparator | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-5986; Rev 0; 9/11
EVALUATION KIT AVAILABLE
MAX44269
1.3mm x 1.3mm, Low-Power
Dual Comparator
General Description
The MAX44269 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 requires just 0.5µA of typical supply
current per comparator. It has a rail-to-rail input struc-
ture and a unique output stage that limits supply current
surges while switching. This design also minimizes over-
all power consumption under dynamic 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
0.5µA per Comparator
S Ultra-Small 1.3mm x 1.3mm WLP Package
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/MAX44269.related.
Typical Application Circuit
REMOTE KEY
VCC
CONNECTOR
VCC
VREF
VCC
VCC
MAX44269
OUT1
VPULL
VPULL
OUT2
ACCESSORY ID
GND
����������������������������������������������������������������� 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.
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
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MAX44269
1.3mm x 1.3mm, Low-Power
Dual Comparator
Typical Operating Characteristics (continued)
(VCC = 5V, VGND = 0V, VIN- = VIN+ = 1.2V, 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.)
LEAKAGE CURRENT vs. TEMPERATURE
PROPAGATION DELAY
vs. PULLUP RESISTANCE
0.50 120
PROPAGATION DELAY
vs. CAPACITIVE LOAD
100
0.45
0.40 100
90
80 tPLH
0.35
0.30
0.25
0.20 VCC = 5V VCC = 2.7V
0.15
0.10
0.05 VCC = 1.8V
0
-50 -30 -10 10 30 50 70 90 110
TEMPERATURE (°C)
PROPAGATION DELAY vs. TEMPERATURE
(VOVERDRIVE = 100mV, VDD = 5V)
45
80
tPLH
60
40
20 tPHL
0
1k
60
10k 100k 1M
PULLUP RESISTANCE (I)
PROPAGATION DELAY
vs. INPUT OVERDRIVE (tPLH)
10M
70
60
50
40
30
20 tPHL
10
0
0 200 400 600 800 1000
CAPACITIVE LOAD (pF)
PROPAGATION DELAY
vs. INPUT OVERDRIVE (tPLH)
12
40
35
30
25 tPLH
20
15 tPHL
10
5
50
TA = -40°C
TA = +25°C
40
30
20 TA = +85°C
10
10
8 TA = -40°C
6 TA = +25°C
4
2
TA = +85°C
0
-40
4.5
-20 0 20 40 60 80
TEMPERATURE (°C)
INPUT REFERRED HYSTERESIS
vs. TEMPERATURE
100
0
0 200 400 600 800 1000
INPUT OVERDRIVE VOLTAGE (mV)
PROPAGATION DELAY
100mVP-P OVERDRIVE
MAX44269 toc17
0
0 200 400 600 800 1000
INPUT OVERDRIVE VOLTAGE (mV)
PROPAGATION DELAY
20mVP-P OVERDRIVE
MAX44269 toc18
4.0
3.5
VOUT
VOUT
3.0
500mV/div
500mV/div
2.5
2.0
1.5
1.0
0.5
0
-40
-20
0 20 40 60
TEMPERATURE (°C)
80 100
VIN
50mV/div
20µs /div
VIN
10mV/div
20µs /div
����������������������������������������������������������������� Maxim Integrated Products 5
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
www.DataSheet.co.kr
MAX44269
1.3mm x 1.3mm, Low-Power
Dual Comparator
Since the comparator’s output is open drain, it goes to The frequency of the relaxation oscillator is:
high impedance corresponding to logic-high. So, when
the output
through the
risesaisttolor gniect-whoigrkh,fotrhmeedC1bycRa1patocRito5racshsa=hrogwens f
in Figure 8. An accurate calculation of tHIGH would have
involved applying thevenin’s theorem to compute the
1
=
tHIGH + tLOW
1
( )R5C11n
V T _FALL
( ) VT_RISE
VCC − VT_RISE
VCC − VT_FALL
equivalent thevenin voltage (VTHEVENIN) and thevenin
resistance (RTHEVENIN) in series with the capacitor
C1. tHIGH can then be computed using the basic time
domain equations for the charging RC circuit as:
Simple PWM Generation Circuit
A pulse-width modulated (PWM) signal generator can be
made utilizing both comparators in the IC (Figure 9). The
capacitor/feedback resistor combination on INA- deter-
tHIGH
=
R
THEVENIN
C1
ln
VTHEVENIN
VTHEVENIN
−
−
V T _RISE
V T _FALL
mines the switching frequency and the analog control
voltage determines the pulse width.
R THEVENIN= [(R2 R4) + R3] R1+ R5
=VTHEVENIN
VCC [(R2 R4)
(R2 R4) + R3
+ R3]
+ R1
+
VCC x R4
R2 + R4
x
(R2
R1
R4) +
R3
+
R1
The tHIGH calculation can be simplified by selecting the
component values in such a way that R3 >> R1 and R5
>> R1. This ensures that the output of the comparator
goes close to VCC when at logic-high (that is, VTHEVENIN
~ VCC and RTHEVENIN ~ R5). With this selection, tHIGH
can be approximated as:
tHIGH
=
R5C1
ln
VCC
VCC
−
−
V T _RISE
V T _FALL
VCC VCC
R2
R3
R1
R5
R4
C1
RTHEVENIN
VTHEVENIN
C1
Figure 8. Charging Network Corresponding to Logic-High Output
VCC
R2
R4
VCC
R1
VT_FALL
C1 WAVEFORM
VT_RISE
OUT
WAVEFORM
R3
C1
ANALOG
CONTROL
VOLTAGE
INA-
R5
MAX44269
OUT
VCC
R6
GND
Figure 7. Relaxation Oscillator Waveforms
Figure 9. PWM Generator
���������������������������������������������������������������� Maxim Integrated Products 11
Datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet MAX44269.PDF ] | |
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