19-5930; Rev 1; 1/12
EVALUATION KIT AVAILABLE
MAX34406
Quad Current-Sense Amplifier
with Overcurrent Threshold Comparators
General Description
The MAX34406 is a quad, high-side, unidirectional, cur-
rent-sense amplifier that offers precision accuracy. It
provides analog outputs for each of the four amplifiers
that can be routed to an external ADC, and contains four
overcurrent comparators with a fixed 1.0V threshold. All
four comparators are logically ORed, and the result can
be delayed/filtered with an external capacitor before it is
fed to a latched common shutdown open-drain output pin.
Features
S
Four Precision Current-Sense Amplifiers
S
Fixed Gains of 25V/V, 50V/V, 100V/V, and 200V/V
S
Less Than ±600µV of Input Offset
S
Less Than ±0.6% of Gain Error (T/F/H) or ±0.8% of
Gain Error (W)
S
Wide 2.0V to 28V Common Mode Range
S
Analog Voltage Outputs for Each Amplifier
S
Independent Overcurrent Comparators with Fixed
1.0V Threshold
S
Low Power Consumption
S
-40NC to +85NC Temperature Range
S
Small 24-Pin TQFN (4mm x 4mm) Package
Ordering Information
appears at end of data sheet.
Applications
Network Switches/Routers
Base Stations
Servers
Smart Grid Network Systems
Industrial Controls
Block Diagram
V
DD
ENA
AMPLIFIER 4
AMPLIFIER 3
AMPLIFIER 2
AMPLIFIER 1
4
4
R1
R1
POR
MAX34406
OR
INx+
INx-
P
OR
R
OUT
6V
CLAMP
5µA
CLR
D
CK
Q
SHTDN
N
N
N
LATCH THRESHOLD = V
DD
x 50%
4
1.0V
REFERENCE
4
OUTx
GND
OCx
CDLY
For related parts and recommended products to use with this part, refer to:
www.maxim-ic.com/MAX34406.related
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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.
MAX34406
Quad Current-Sense Amplifier
with Overcurrent Threshold Comparators
ABSOLUTE MAXIMUM RATINGS
Voltage Range on INx+ and INx-
Relative to GND .................................................-0.3V to +30V
Voltage Range on V
DD
Relative to GND.................-0.3V to +6V
Voltage Range on Remaining Pins
Relative to GND .................................... -0.3V to (V
DD
+ 0.3V)
Continuous Power Dissipation (T
A
= +70NC)
TQFN (derate 27.8mW/NC above +70NC)...............2222.2mW
OUT1, OUT2, OUT3, OUT4 Short Circuit to GND ....Continuous
Operating Junction Temperature Range ........... -40NC to +85NC
Storage Temperature Range............................ -55NC to +125NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-
tion 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
INx+
= V
INx-
= 12V, V
SENSE
= 0V, T
A
= -40NC to +85NC, unless otherwise noted. Typical values are T
A
= +25NC) (Note 1)
PARAMETER
V
DD
Operating Range
V
DD
Supply Current
Common-Mode Input Range
Common-Mode Rejection Ratio
Input Offset Voltage
SYMBOL
V
DD
I
DD
V
CM
CMRR
V
OS
(Note 2)
Guaranteed by CMRR
V
INx+
> 2.0V at T
A
= +25NC
(Note 3)
MAX34406T
Gain (0.5V < V
OUTx
< 1.5V)
G
MAX34406F
MAX34406H
MAX34406W
Gain Error
OUTx Output Resistance
GE
R
OUTx
MAX34406T/F/H
MAX34406W
MAX34406T/F/H
MAX34406W
MAX34406T
OUTx Low Voltage
V
OL
MAX34406F
MAX34406H
MAX34406W
MAX34406T
Bandwidth
BW
MAX34406F
MAX34406H
MAX34406W
ENA Input Logic-High
ENA Input Logic-Low
ENA Input Leakage
Output Logic-Low (SHTDN, OCx)
V
OL
I
OL
= 2mA
V
IH
V
IL
V
DD
x
0.7
V
GND
-
0.3
V
OUTx
= 2.0V
(Note 5)
125
60
30
15
V
DD
+
0.3
V
DD
x
0.3
Q1
0.3
V
V
FA
V
kHz
(Note 4)
(Note 5)
10
20
15
30
60
120
mV
2.0
86
120
Q100
25
50
100
200
Q0.6
Q0.8
%
kω
V/V
Q600
CONDITIONS
MIN
2.7
TYP
MAX
5.5
200
28
UNITS
V
FA
V
dB
FV
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Maxim Integrated Products
2
MAX34406
Quad Current-Sense Amplifier
with Overcurrent Threshold Comparators
ELECTRICAL CHARACTERISTICS (continued)
(V
INx+
= V
INx-
= 12V, V
SENSE
= 0V, T
A
= -40NC to +85NC, unless otherwise noted. Typical values are T
A
= +25NC) (Note 1)x
PARAMETER
Output Leakage (SHTDN, OCx)
Comparator Threshold
Comparator Offset
Comparator Hysteresis
Comparator Propagation Delay
SYMBOL
I
O
V
TH
V
COS
V
HYS
t
D
Overdrive =
Q50mV,
output load = 2mA
V
DD
= 3.3V, C
CDLY
= 10nF
V
DD
= 3.3V, C
CDLY
= 22nF
SHTDN Delay
t
DLY
V
DD
= 3.3V, C
CDLY
= 33nF
V
DD
= 5.0V, C
CDLY
= 10nF
V
DD
= 5.0V, C
CDLY
= 22nF
V
DD
= 5.0V, C
CDLY
= 33nF
Note
Note
Note
Note
1:
2:
3:
4:
20
3
3.3
7.3
11
5
11
16
ms
0.98
1.00
CONDITIONS
MIN
TYP
MAX
Q1
1.02
Q5
UNITS
FA
V
mV
mV
Fs
All devices are 100% production tested at T
A
= +25NC. All temperature limits are guaranteed by design.
V
OUT1
, V
OUT2
, V
OUT3
, V
OUT4
= 0V. All open-drain outputs left disconnected.
V
OS
is extrapolated from measurements for the gain-error test.
Gain error is calculated by applying two values of V
SENSE
and calculating the error of the slope vs. the ideal: Gain = 100,
V
SENSE
is 5mV and 15mV.
Note 5:
The device is stable for any external capacitance value.
Typical Operating Characteristics
(V
INx+
= V
INx-
= 12V, T
A
= +25°C, unless otherwise noted.)
+25°C INPUT OFFSET
MAX34406 toc01
+25°C GAIN ERROR
MAX34406 toc02
V
OL
vs. I
OL
140
120
VOLTAGE (mV)
100
80
60
40
20
MAX34406 toc03
20
18
16
% OF POPULATION (%)
14
12
10
8
6
4
2
0
-200 -150 -100
-50
0
50
100
25
20
% OF POPULATION (%)
15
10
5
0
160
OC1
SHTDN
0
-0.15 -0.10 -0.05 0 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40
GAIN ERROR (%)
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
CURRENT IN (mA)
150
OFFSET (µV)
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Maxim Integrated Products
3
MAX34406
Quad Current-Sense Amplifier
with Overcurrent Threshold Comparators
Typical Operating Characteristics (continued)
((V
INx+
= V
INx-
= 12V, T
A
= +25°C, unless otherwise noted.)
INPUT OFFSET
vs. COMMON-MODE VOLTAGE
MAX34406 toc04
INPUT OFFSET vs. TEMPERATURE
MAX34406 toc05
GAIN ERROR
vs. COMMON-MODE VOLTAGE
MAX34406 toc06
30
20
INPUT OFFSET (µV)
10
0
-10
-20
-30
0
5
10
15
20
25
0
-10
INPUT OFFSET (µV)
-20
-30
-40
-50
-60
-40
-15
10
35
60
0.5
0.4
GAIN ERROR (%)
0.3
0.2
0.1
0
-0.1
30
85
0
5
10
15
20
25
30
COMMON-MODE VOLTAGE (V)
TEMPERATURE (°C)
COMMON-MODE VOLTAGE (V)
GAIN ERROR vs. TEMPERATURE
MAX34406 toc07
SMALL-SIGNAL GAIN
vs. FREQUENCY (GAIN = 100)
45
40
35
GAIN (dB)
30
25
20
15
MAX34406 toc08
SMALL-SIGNAL PULSE RESPONSE
(GAIN = 100)
0.5
0.4
GAIN ERROR (%)
0.3
0.2
0.1
0
-40
-15
10
35
60
50
MAX34406 toc09
V
SENSE
10mV
5mV
1.0V
V
OUTx
0.5V
10
5
85
0
1
10
100
1000
FREQUENCY (kHz)
20µs/div
TEMPERATURE (°C)
LARGE-SIGNAL PULSE RESPONSE
(GAIN = 100)
MAX34406 toc10
COMPARATOR THRESHOLD
vs. TEMPERATURE
MAX34406 toc11
SHTDN DELAY vs. TEMPERATURE
C
CDLY
= 10nF
3.5
3.0
SHTDN DELAY (ms)
2.5
2.0
1.5
1.0
0.5
MAX34406 toc12
1.05
1.04
4.0
25mV
THRESHOLD (V)
1.03
1.02
1.01
1.00
0.99
0.98
0.97
0.96
0.95
-40
-15
10
35
60
V
SENSE
5mV
2.5V
V
OUTx
0.5V
20µs/div
85
0
-45
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
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Maxim Integrated Products
4
MAX34406
Quad Current-Sense Amplifier
with Overcurrent Threshold Comparators
Pin Configuration
OUT4
OUT3
IN4+
IN3+
13
12
11
10
9
OC4
OC3
OC2
OC1
N.C.
N.C.
8
7
1
IN1+
2
IN1-
3
OUT1
4
OUT2
5
IN2-
6
IN2+
IN4-
18
V
DD
19
ENA 20
SHTDN 21
CDLY 22
N.C. 23
GND 24
17
16
15
MAX34406
+
TQFN
(4mm x 4mm)
IN3-
14
EP
TOP VIEW
Pin Description
PIN
1
2
3
4
5
6
7, 8, 23
9
10
11
12
13
NAME
IN1+
IN1-
OUT1
OUT2
IN2-
IN2+
N.C.
OC1
OC2
OC3
OC4
IN3+
FUNCTION
External Sense Resistor Power-Side Connection for Amplifier 1. Bias at this pin also provides the supply
voltage for amplifier 1. This pin can be left open circuit if not needed.
External Sense Resistor Load-Side Connection for Amplifier 1
Output Voltage from Amplifier 1 Proportional to V
SENSE
. This output is clamped at 6V.
Output Voltage from Amplifier 2 Proportional to V
SENSE
. This output is clamped at 6V.
External Sense Resistor Load-Side Connection for Amplifier 2
External Sense Resistor Power-Side Connection for Amplifier 2. Bias at this pin also provides the supply
voltage for amplifier 2. This pin can be left open circuit if not needed.
No Connection. Not internally connected.
Overcurrent Threshold Comparator Associated with Amplifier 1. Open-drain output. This output
transitions to high impedance during an overcurrent event.
Overcurrent Threshold Comparator Associated with Amplifier 2. Open-drain output. This output
transitions to high impedance during an overcurrent event.
Overcurrent Threshold Comparator Associated with Amplifier 3. Open-drain output. This output
transitions to high impedance during an overcurrent event.
Overcurrent Threshold Comparator Associated with Amplifier 4. Open-drain output. This output
transitions to high impedance during an overcurrent event.
External Sense Resistor Power-Side Connection for Amplifier 3. Bias at this pin also provides the supply
voltage for amplifier 3. This pin can be left open circuit if not needed.
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Maxim Integrated Products
5
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