19-5803; Rev 0; 3/11
KIT
ATION
EVALU
BLE
AVAILA
Low-Power Comparators with Precision
Reference in 4-Bump UCSP
General Description
The MAX9644/MAX9645/MAX9646 are small, single com-
parators, 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 pow-
ered 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.
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 (100nA 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
Ordering Information
PART
MAX9644EBS+G45
MAX9644EUK+
MAX9645EBS+G45
MAX9645EUK+
MAX9646EBS+G45
MAX9646EUK+
PIN-PACKAGE
4 UCSP
5 SOT23
4 UCSP
5 SOT23
4 UCSP
5 SOT23
TOP MARK
+AGL
+AFJN
+AGM
+AFJO
+AGN
+AFJP
Applications
Cell Phones
Portable Media Players
Electronic Toys
Notebook Computers
Portable Medical Devices
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.
Selector Guide
PART
MAX9644
MAX9645
MAX9646
REFERENCE VOLTAGE (V)
0.2
0.2
0.2
INPUT
Noninverting
Inverting
Noninverting
OUTPUT
Open drain
Open drain
Push-pull
UCSP is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________
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.
Low-Power Comparators with Precision
Reference in 4-Bump UCSP
MAX9644/MAX9645/MAX9646
ABSOLUTE MAXIMUM RATINGS
V
CC
, 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
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
(V
CC
= 3.3V, R
PULLUP
= 10kΩ to V
PULLUP
= 3.3V for MAX9644/MAX9645, T
A
= -40°C to +85°C. Typical values at T
A
= +25°C, unless
otherwise noted.) (Note 1)
PARAMETER
DC CHARACTERISTICS
Input Voltage Range
Input Bias Current
Input Leakage Current
V
IN
I
IN
I
IN_SHDN
Guaranteed by I
IN
test
V
IN
= 0.2V to 5.5V (Note 2)
V
CC
= 0, V
IN
= 5.5V (Note 2)
I
SINK
= 50µA, V
CC
= 1.0V
I
SINK
= 200µA, V
CC
= 1.2V
Output Voltage Low
V
OL
I
SINK
= 500µA, V
CC
= 1.8V
I
SINK
= 0.75mA, V
CC
= 3.3V
I
SINK
= 1.2mA, V
CC
= 5.5V
I
SOURCE
= 15µA, V
CC
= 1.0V
Output Voltage High
(MAX9464 Only)
I
SOURCE
= 40µA, V
CC
= 1.2V
V
OH
I
SOURCE
= 180µA, V
CC
= 1.8V
I
SOURCE
= 0.3mA, V
CC
= 3.3V
I
SOURCE
= 0.75mA, V
CC
= 5.5V
Output Leakage Current
(MAX9644/MAX9645 Only)
AC CHARACTERISTICS
Propagation Delay
Fall Time
Rise Time
REFERENCE VOLTAGE
Input Threshold (Note 4)
Input Threshold Error
(Note 4)
Input Threshold Hysteresis
REF Tempco
Power-Supply Rejection
Ratio
V
REF
Delta-V
REF
V
HYS
V
REF_TEMPCO
PSRR
MAX964_EBS+
MAX964_EUK+
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= -40°C to +85°C (Note 5)
(Note 6)
V
CC
= 1.0V to 5.5V
40
-1
-3.5
±0.9
6
53
200
199
+1
+3.5
mV
%
mV
µV/°C
dB
t
PD
t
F
t
R
V
OVERDRIVE
= ±100mV (Note 3)
C
L
= 10pF
C
L
= 10pF, MAX9646 only
15
14
30
µs
ns
ns
I
OUT_LEAKAGE
OUT = high, V
PULLUP
= 5.5V
(Note 2)
-0.3
0.06
< 0.1
0.03
0.08
0.13
0.14
0.19
V
CC
- 0.08V
V
CC
- 0.08V
V
CC
- 0.15V
V
CC
- 0.13V
V
CC
- 0.24V
< 0.1
+5.5
15
15
0.2
0.20
0.23
0.3
0.5
V
CC
- 0.2V
V
CC
- 0.20V
V
CC
- 0.23V
V
CC
- 0.3V
V
CC
- 0.5V
15
nA
V
V
V
nA
nA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
Low-Power Comparators with Precision
Reference in 4-Bump UCSP
ELECTRICAL CHARACTERISTICS
(V
CC
= 3.3V, R
PULLUP
= 10kΩ to V
PULLUP
= 3.3V for MAX9644/MAX9645, T
A
= -40°C to +85°C. Typical values at T
A
= +25°C, unless
otherwise noted.) (Note 1)
PARAMETER
POWER SUPPLY
Supply Voltage
Supply Current
Power-Up Time
V
CC
I
CC
t
ON
Guaranteed by V
OL
/V
OH
tests
V
CC
= 1.0V
V
CC
= 5.5V
1.0
0.4
0.6
3
5.5
0.7
1.1
V
µA
ms
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX9644/MAX9645/MAX9646
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
All devices are 100% production tested at T
A
= +25°C. Temperature limits are guaranteed by design.
Too small to be measured in an ATE test environment. Only gross test to catch failures is implemented.
Overdrive is defined as the voltage above or below the switching points.
Guaranteed by ATE and/or bench characterization over temperature. V
REF
is the average of the trip points.
Hysteresis is half the input voltage difference between the two switching points.
Includes reference error along with comparator offset voltage error.
Typical Operating Characteristics
(V
CC
= 3.3V, V
REF
= 1.8V, R
PULLUP
= 10kΩ to V
PULLUP
= 3.3V for MAX9644/MAX9645, GND = 0, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX9644 toc01
SUPPLY CURRENT
vs. OUTPUT TRANSITION FREQUENCY
MAX9644 toc02
OUTPUT VOLTAGE LOW
vs. SINK CURRENT
0.9
OUTPUT VOLTAGE LOW (V)
0.8
0.7
0.6
0.5
0.4
0.3
0.2
V
REF
= 3.3V
V
REF
= 1.8V
0
2
4
SINK CURRENT (mA)
6
8
V
REF
= 5V
MAX9644 toc03
1000
100
1.0
800
SUPPLY CURRENT (nA)
+25°C
600
SUPPLY CURRENT (µA)
+85°C
V
CC
= 5V
10
V
CC
= 3.3V
V
CC
= 1.8V
400
200
-40°C
0
0
1
2
3
4
5
6
SUPPLY VOLTAGE (V)
1
0.1
1
10
100
OUTPUT TRANSITION FREQUENCY (kHz)
0.1
0
_______________________________________________________________________________________
3
Low-Power Comparators with Precision
Reference in 4-Bump UCSP
MAX9644/MAX9645/MAX9646
Typical Operating Characteristics
(V
CC
= 3.3V, V
REF
= 1.8V, R
PULLUP
= 10kΩ to V
PULLUP
= 3.3V for MAX9644/MAX9645, GND = 0, T
A
= +25°C, unless otherwise noted.)
OUTPUT VOLTAGE HIGH
vs. SOURCE CURRENT (MAX9646)
MAX9644 toc04
INPUT BIAS CURRENT
vs. INPUT BIAS VOLTAGE
MAX9644 toc05
1.0
OIUTPUT VOLTAGE HIGH (V
CC
- V
OH
, V)
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
0.5
1.0
1.5
2.0
2.5
V
CC
= 1.8V
V
CC
= 3.3V
V
CC
= 5V
5
INPUT BIAS CURRENT (nA)
0
-5
-10
-15
V
CC
= 3.3V
0
0.05
0.10
0.15
0.20
0.25
0.30
-20
3.0
SOURCE CURRENT (mA)
INPUT BIAS VOLTAGE (V)
REFERENCE VOLTAGE
vs. TEMPERATURE
MAX9644 toc11
REFERENCE VOLTAGE
vs. SUPPLY VOLTAGE
200.8
REFERENCE VOLTAGE (mV)
200.6
200.4
200.2
200.0
199.8
199.6
199.4
199.2
199.0
MAX9644 toc07
202.0
201.9
REFERENCE VOLTAGE (mV)
201.8
201.7
201.6
201.5
201.4
201.3
201.2
201.1
201.0
-40
-15
10
V
CC
= 3.3V
201.0
35
60
85
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
PROPAGATION DELAY
vs. TEMPERATURE
V
OD
=
±100mV
16
PROPAGATION DELAY (µs)
15
V
CC
= 5V
14
13
12
11
10
9
-40
-15
10
35
60
85
TEMPERATURE (°C)
V
CC
= 1.8V
V
CC
= 3.3V
MAX9644 toc08
PROPAGATION DELAY
vs. INPUT OVERDRIVE
70
PROPAGATION DELAY (µs)
60
50
40
30
20
10
0
0
50
100
150
200
250
INPUT OVERDRIVE (mV)
V
CC
= 1.8V
V
CC
= 3.3V
V
CC
= 5V
MAX9644 toc09
17
80
4
_______________________________________________________________________________________
Low-Power Comparators with Precision
Reference in 4-Bump UCSP
Typical Operating Characteristics (continued)
(V
CC
= 3.3V, V
REF
= 1.8V, R
PULLUP
= 10kΩ to V
PULLUP
= 3.3V for MAX9644/MAX9645, GND = 0, T
A
= +25°C, unless otherwise noted.)
MAX9644/MAX9645/MAX9646
PROPAGATION DELAY AT V
CC
= 3.3V
MAX9644 toc10
REFERENCE VOLTAGE
vs. TEMPERATURE
201.9
REFERENCE VOLTAGE (mV)
IN+
100mV/div
201.8
201.7
201.6
201.5
201.4
201.3
201.2
201.1
V
CC
= 3.3V
MAX9644 toc11
202.0
0.3V
0.1V
OUT
2V/div
0V
100µs/div
201.0
-40
-15
10
35
60
85
POWER-UP/POWER-DOWN RESPONSE
MAX9644 toc12
OUTPUT RESPONSE TO
SUPPLY VOLTAGE TRANSIENT
MAX9644 toc13
V
IN
= 0.3V
V
CC
= 3.3V
3.2V
3V
V
CC
2V/div
V
IN
= V
TH
+ 1mV
V
CC
200mV/div
OUT
2V/div
0V
0V
V
IN
= V
TH
+ 10mV
OUT
2V/div
OUT
2V/div
OUT
2V/div
0V
0V
V
IN
= V
TH
+ 20mV
0V
1ms/div
1ms/div
POWER-SUPPLY REJECTION
FOR NO FALSE TRIGGERING
MAX9644 toc14
206
204
TRIP POINT (mV)
202
200
198
196
V
CC
= 3.3V + 100mV
P-P
194
10
100
1k
10k
100k
LOWER TRIP POINT
UPPER TRIP POINT
1M
FREQUENCY (Hz)
_______________________________________________________________________________________
5
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