MAXIM MAX9644, MAX9645, MAX9646 User Manual
General Description
The MAX9644/MAX9645/MAX9646 are small, single comparators, ideal for a wide variety of portable electronics
applications such as cell phones, media players, and
notebooks that have extremely tight board space and
power constraints. These comparators are offered in both
a miniature 4-bump UCSP™ package with a 1mm x 1mm
footprint (as small as two 0402 resistors) and a
5-pin SOT23 package.
The ICs feature an input voltage range of -0.3V to
+5.5V, independent of supply voltage. These devices
maintain high impedance at the inputs even when powered down (V
CC
or V
REF
= 0V). They also feature inter-
nal filtering to provide high RF immunity.
The ICs have an internal 0.2V reference. These devices
feature either a push-pull or an open-drain output. They
consume only 700nA (max) supply current and operate
down to V
CC
= 1V over the extended -40°C to +85°C tem-
perature range.
Applications
Cell Phones
Portable Media Players
Electronic Toys
Notebook Computers
Portable Medical Devices
Features
o Tiny, 1mm x 1mm x 0.6mm 4-Bump UCSP
Footprint = Two 0402 Resistors
Also Available in a 5-Pin SOT23 Package
o Ultra-Low Operating Current (700nA max)
o -0.3V to +5.5V Input Voltage Range
o Internal 0.2V Reference Trimmed to 1% Accuracy
o 15µs Propagation Delay
o -40°C to +85°C Extended Temperature Range
MAX9644/MAX9645/MAX9646
Low-Power Comparators with Precision
Reference in 4-Bump UCSP
________________________________________________________________
Maxim Integrated Products
1
19-5803; Rev 1; 10/11
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.
EVALUATION KIT
AVAILABLE
Ordering Information
PART PIN-PACKAGE TOP MARK
MAX9644EBS+G45 4 UCSP +AGL
MAX9644EUK+ 5 SOT23 +AFJN
MAX9645EBS+G45 4 UCSP +AGM
MAX9645EUK+ 5 SOT23 +AFJO
MAX9646EBS+G45 4 UCSP +AGN
MAX9646EUK+ 5 SOT23 +AFJP
Note: All devices are specified over the extended -40°C to
+85°C operating temperature range.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
G45
= Protective die coating.
UCSP is a trademark of Maxim Integrated Products, Inc.
Selector Guide
PART REFERENCE VOLTAGE (V) INPUT OUTPUT
MAX9644 0.2 Noninverting Open drain
MAX9645 0.2 Inverting Open drain
MAX9646 0.2 Noninverting Push-pull
MAX9644/MAX9645/MAX9646
Low-Power Comparators with Precision
Reference in 4-Bump UCSP
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC= 3.3V, R
PULLUP
= 10kΩ to V
PULLUP
= 3.3V for MAX9644/MAX9645, TA= -40°C to +85°C. Typical values at TA= +25°C, unless
otherwise noted.) (Note 1)
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.
VCC, REF, IN to GND................................................-0.3V to +6V
OUT to GND (MAX9644/MAX9645)..........................-0.3V to +6V
OUT to GND (MAX9646 only) .................-0.3V to + (V
CC
+ 0.3V)
Output Short-Circuit Current Duration ....................................10s
Input Current into Any Terminal........................................±20mA
Continuous Power Dissipation
4-Bump UCSP (derate 3.0mW/°C above +70°C) .......238 mW
5-Pin SOT23 (derate 3.9mW/°C above +70°C)...........312 mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Bump Temperature (soldering) Reflow............................+235°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DC CHARACTERISTICS
Input Voltage Range V
Input Bias Current I
Input Leakage Current I
Output Voltage Low V
Output Voltage High
(MAX9464 Only)
Output Leakage Current
(MAX9644/MAX9645 Only)
AC CHARACTERISTICS
Propagation Delay t
Fall Time t
Rise Time t
REFERENCE VOLTAGE
Input Threshold (Note 4) V
Input Threshold Error
(Note 4)
Input Threshold Hysteresis V
REF Tempco V
Power-Supply Rejection
Ratio
I
OUT_LEAKAGE
Delta-V
REF_TEMPCO
IN
IN
IN_SHDN
OL
V
OH
PD
F
R
REF
REF
HYS
PSRR V
Guaranteed by IIN test -0.3 +5.5 V
VIN = 0.2V to 5.5V (Note 2) 0.06 15 nA
VCC = 0, VIN = 5.5V (Note 2) < 0.1 15 nA
I
= 50µA, VCC = 1.0V 0.03 0.2
SINK
I
= 200µA, VCC = 1.2V 0.08 0.20
SINK
I
= 500µA, VCC = 1.8V 0.13 0.23
SINK
I
= 0.75mA, VCC = 3.3V 0.14 0.3
SINK
I
= 1.2mA, VCC = 5.5V 0.19 0.5
SINK
I
I
I
I
I
OUT = high, V
= 15µA, VCC = 1.0V V
SOURCE
= 40µA, VCC = 1.2V V
SOURCE
= 180µA, VCC = 1.8V V
SOURCE
= 0.3mA, VCC = 3.3V V
SOURCE
= 0.75mA, VCC = 5.5V V
SOURCE
PULLUP
(Note 2)
V
OVERDRIVE
= ±100mV (Note 3) 15 µs
CL = 10pF 14 ns
CL = 10pF, MAX9646 only 30 ns
MAX964_EBS+ 200
MAX964_EUK+ 199
TA = +25°C -1 +1
TA = -40°C to +85°C -3.5 +3.5
TA = -40°C to +85°C (Note 5) ±0.9 mV
(Note 6) 6 µV/°C
= 1.0V to 5.5V 40 53 dB
CC
= 5.5V
- 0.08V V
C C
- 0.08V V
C C
- 0.15V V
C C
- 0.13V V
C C
- 0.24V V
C C
< 0.1 15 nA
C C
- 0.20V
C C
- 0.23V
C C
C C
C C
- 0.2V
- 0.3V
- 0.5V
V
V
mV
%
MAX9644/MAX9645/MAX9646
Low-Power Comparators with Precision
Reference in 4-Bump UCSP
_______________________________________________________________________________________ 3
Note 1: All devices are 100% production tested at TA = +25°C. Temperature limits are guaranteed by design.
Note 2: Too small to be measured in an ATE test environment. Only gross test to catch failures is implemented.
Note 3: Overdrive is defined as the voltage above or below the switching points.
Note 4: Guaranteed by ATE and/or bench characterization over temperature. V
REF
is the average of the trip points.
Note 5: Hysteresis is half the input voltage difference between the two switching points.
Note 6: Includes reference error along with comparator offset voltage error.
ELECTRICAL CHARACTERISTICS
(VCC= 3.3V, R
PULLUP
= 10kΩ to V
PULLUP
= 3.3V for MAX9644/MAX9645, TA= -40°C to +85°C. Typical values at TA= +25°C, unless
otherwise noted.) (Note 1)
Typical Operating Characteristics
(VCC= 3.3V, V
REF
= 1.8V, R
PULLUP
= 10kΩ to V
PULLUP
= 3.3V for MAX9644/MAX9645, GND = 0, TA= +25°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
POWER SUPPLY
Supply Voltage V
Supply Current I
Power-Up Time t
CC
CC
ON
Guaranteed by VOL/VOH tests 1.0 5.5 V
VCC = 1.0V 0.4 0.7
VCC = 5.5V 0.6 1.1
3ms
1000
800
600
400
SUPPLY CURRENT (nA)
200
0
06
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
+85°C
+25°C
-40°C
SUPPLY VOLTAGE (V)
MAX9644 toc01
54321
vs. OUTPUT TRANSITION FREQUENCY
SUPPLY CURRENT
100
VCC = 5V
10
SUPPLY CURRENT (µA)
1
0.1 100
VCC = 3.3V
VCC = 1.8V
110
OUTPUT TRANSITION FREQUENCY (kHz)
1.0
0.9
MAX9644 toc02
0.8
0.7
0.6
0.5
0.4
0.3
OUTPUT VOLTAGE LOW (V)
0.2
0.1
0
OUTPUT VOLTAGE LOW
vs. SINK CURRENT
V
= 3.3V
REF
V
= 1.8V
REF
048
SINK CURRENT (mA)
µA
MAX9644 toc03
V
= 5V
REF
62
REFERENCE VOLTAGE
vs. TEMPERATURE
MAX9644 toc11
TEMPERATURE (°C)
REFERENCE VOLTAGE (mV)
201.6
202.0
201.8
201.4
201.2
201.0
201.7
201.9
201.5
201.3
201.1
-40 8510 60-15 35
VCC = 3.3V
MAX9644/MAX9645/MAX9646
Low-Power Comparators with Precision
Reference in 4-Bump UCSP
4 _______________________________________________________________________________________
Typical Operating Characteristics
(VCC= 3.3V, V
REF
= 1.8V, R
PULLUP
= 10kΩ to V
PULLUP
= 3.3V for MAX9644/MAX9645, GND = 0, TA= +25°C, unless otherwise noted.)
OUTPUT VOLTAGE HIGH
vs. SOURCE CURRENT (MAX9646)
1.0
0.9
, V)
OH
0.8
- V
0.7
CC
0.6
0.5
0.4
0.3
0.2
OIUTPUT VOLTAGE HIGH (V
0.1
0
VCC = 1.8V
01.51.0 2.5 3.00.5 2.0
SOURCE CURRENT (mA)
VCC = 5V
VCC = 3.3V
MAX9644 toc04
-10
INPUT BIAS CURRENT (nA)
-15
-20
201.0
200.8
200.6
200.4
200.2
200.0
199.8
199.6
REFERENCE VOLTAGE (mV)
199.4
199.2
199.0
INPUT BIAS CURRENT
vs. INPUT BIAS VOLTAGE
5
0
-5
0 0.20 0.25 0.300.05 0.10 0.15
INPUT BIAS VOLTAGE (V)
REFERENCE VOLTAGE
vs. SUPPLY VOLTAGE
1.0 5.02.5 3.0 4.54.01.5 2.0 3.5
SUPPLY VOLTAGE (V)
MAX9644 toc05
VCC = 3.3V
MAX9644 toc07
17
16
15
14
13
12
PROPAGATION DELAY (µs)
11
10
9
-40 -15 60 853510
PROPAGATION DELAY
vs. TEMPERATURE
VOD = ±100mV
VCC = 3.3V
TEMPERATURE (°C)
VCC = 1.8V
VCC = 5V
MAX9644 toc08
PROPAGATION DELAY (µs)
80
70
60
50
40
30
20
10
0
PROPAGATION DELAY
vs. INPUT OVERDRIVE
VCC = 1.8V
VCC = 3.3V
0 100 150 25020050
INPUT OVERDRIVE (mV)
MAX9644 toc09
VCC = 5V
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