monitors that operate over a wide voltage range of 7V to
80V. In default operation mode, the onboard 12-bit ADC
continuously measures high side current, input voltage
and an external voltage. Data is reported through the I
2
C
interface when polled by a host. The monitors can also
perform on-demand measurement in a snapshot mode.
The LTC4151 features a dedicated shutdown pin to reduce
power consumption. The LTC4151-1 features split I
2
C
data pins with data in and an inverted data output to drive
optoisolators.
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Wide Operating Voltage Range: 7V to 80V
12-Bit Resolution for Both Current and Voltages
I
2
C Interface
Additional ADC Input Monitors an External Voltage
Continuous Scan and Snapshot Modes
Shutdown Mode (LTC4151) Reduces Quiescent
Current to 120μA
Split SDA for Optoisolation (LTC4151-1)
Tiny 10-Lead MSOP and 3mm
×
3mm DFN Packages
APPLICATIONS
n
n
n
n
Telecom Infrastructure
Automotive
Industrial
Consumer
TYPICAL APPLICATION
1.0
12-Bit ADC DNL and INL
High Side Power Sensing with Onboard ADC and I
2
C
V
IN
7V to 80V
0.02Ω
V
OUT
SENSE
+
SENSE
–
2k
V
IN
LTC4151
SCL
ADR1
ADR0
GND
SDA
ADIN
MEASURED
VOLTAGE
SCL
SDA
41511 TA01
0.5
ADC DNL (LSB)
3.3V
0
2k
V
DD
μCONTROLLER
–0.5
SHDN
–1.0
0
1024
2048
CODE
3072
4096
41511 TA01b
1.0
0.5
ADC INL (LSB)
0
–0.5
–1.0
0
1024
2048
CODE
3072
4096
41511 TA01c
41511fa
1
LTC4151/LTC4151-1
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 3)
V
IN
Voltage ................................................. –0.3V to 90V
SENSE
+
, SENSE
–
Voltages .......................... V
IN
– 10V or
–0.3V to V
IN
+ 0.3V
ADR1, ADR0 Voltages .............................. –0.3V to 90V
ADIN,
SHDN, SDAO
Voltages ...................... –0.3V to 6V
SCL, SDA, SDAI Voltages (Note 2) ........... –0.3V to 5.5V
SCL, SDA, SDAI Clamp Current .............................. 5mA
Operating Temperature Range
LTC4151C/LTC4151C-1 ............................ 0°C to 70°C
LTC4151I/LTC4151I-1 ..........................–40°C to 85°C
Storage Temperature Range
MSOP ................................................–65°C to 150°C
DFN....................................................–65°C to 125°C
Lead Temperature (Soldering, 10 sec)
MSOP Only ....................................................... 300°C
PIN CONFIGURATION
LTC4151
TOP VIEW
SENSE
+
V
IN
ADR1
ADR0
ADIN
1
2
3
4
5
11
10 SENSE
–
9 GND
8
SHDN
7 SDA
6 SCL
TOP VIEW
SENSE
V
IN
ADR1
ADR0
ADIN
+
LT4151
1
2
3
4
5
10
9
8
7
6
SENSE
–
GND
SHDN
SDA
SCL
DD PACKAGE
10-LEAD (3mm 3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 45°C/W
EXPOSED PAD (PIN 11) PCB GND CONNECTION OPTIONAL
LTC4151-1
TOP VIEW
SENSE
+
V
IN
ADR1
ADR0
ADIN
1
2
3
4
5
11
10 SENSE
–
9 GND
8
SDAO
7 SDAI
6 SCL
SENSE
V
IN
ADR1
ADR0
ADIN
+
MS PACKAGE
10-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 85°C/W
LTC4151-1
TOP VIEW
1
2
3
4
5
10
9
8
7
6
SENSE
–
GND
SDAO
SDAI
SCL
DD PACKAGE
10-LEAD (3mm 3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 45°C/W
EXPOSED PAD (PIN 11) PCB GND CONNECTION OPTIONAL
MS PACKAGE
10-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 85°C/W
41511fa
2
LTC4151/LTC4151-1
ORDER INFORMATION
LEAD FREE FINISH
LTC4151CDD#PBF
LTC4151IDD#PBF
LTC4151CDD-1#PBF
LTC4151IDD-1#PBF
LTC4151CMS#PBF
LTC4151IMS#PBF
LTC4151CMS-1#PBF
LTC4151IMS-1#PBF
TAPE AND REEL
LTC4151CDD#TRPBF
LTC4151IDD#TRPBF
LTC4151CDD-1#TRPBF
LTC4151IDD-1#TRPBF
LTC4151CMS#TRPBF
LTC4151IMS#TRPBF
LTC4151CMS-1#TRPBF
LTC4151IMS-1#TRPBF
PART MARKING*
LCWZ
LCWZ
LCXC
LCXC
LTCWY
LTCWY
LTCXB
LTCXB
PACKAGE DESCRIPTION
10-Lead (3mm x 3mm) Plastic DFN
10-Lead (3mm x 3mm) Plastic DFN
10-Lead (3mm x 3mm) Plastic DFN
10-Lead (3mm x 3mm) Plastic DFN
10-Lead Plastic MSOP
10-Lead Plastic MSOP
10-Lead Plastic MSOP
10-Lead Plastic MSOP
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS
SYMBOL
General
V
IN
I
IN
I
SENSE
+
I
SENSE
–
V
SHDN(TH)
I
SHDN
ADC
RES
V
FS
Resolution (No Missing Codes)
Full-Scale Voltage
Supply Voltage
Supply Current
SENSE
+
Input Current
SENSE
–
Input Current
SHDN
Input Threshold
SHDN
Input Current
PARAMETER
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
is from 7V to 80V, unless noted. (Note 3)
CONDITIONS
l
MIN
7
TYP
MAX
80
UNITS
V
mA
μA
μA
μA
V
μA
Bits
V
IN
= 48V, Normal Operation Mode
V
IN
= 12V, Shutdown Mode
V
IN
, SENSE
+
, SENSE
–
= 48V
V
IN
, SENSE
+
, SENSE
–
= 48V
SHDN
= 0V
(Note 4)
(SENSE
+
– SENSE
–
)
V
IN
ADIN
(SENSE
+
– SENSE
–
)
V
IN
ADIN
(SENSE
+
– SENSE
–
)
V
IN
(Note 5)
ADIN, LTC4151C, LTC4151C-1
ADIN, LTC4151I, LTC4151I-1
(SENSE
+
– SENSE
–
)
V
IN
(Note 6)
ADIN
(SENSE
+
– SENSE
–
)
V
IN
(Note 5)
ADIN
l
l
l
l
l
l
1.2
120
5
0.1
1
–3
12
81.92
102.4
2.048
20
25
0.5
1.5
–5
1.7
300
9
1
2
–8
l
mV
V
V
μV
mV
mV
±1.25
±1
±0.75
±1
±5
±6
±8
%
%
%
%
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB Step Size
TUE
Total Unadjusted Error
l
l
l
l
l
l
l
l
l
l
V
OS
Offset Error
INL
Integral Nonlinearity
±1
±1
±0.5
±3
±3
±2
41511fa
3
LTC4151/LTC4151-1
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
Transition Noise
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
is from 7V to 80V, unless noted. (Note 3)
CONDITIONS
(SENSE
+
– SENSE
–
)
V
IN
ADIN
l
MIN
TYP
1.2
0.3
22
MAX
UNITS
μV
RMS
mV
RMS
μV
RMS
σ
T
f
CONV
t
CONV
R
ADIN
I
ADIN
I
2
C Interface
V
ADR(H)
V
ADR(L)
I
ADR(IN)
V
SDA(OL)
I
SDA,SCL(IN)
V
SDA,SCL(TH)
V
SDA,SCL(CL)
f
SCL(MAX)
t
LOW
t
HIGH
t
BUF(MIN)
t
HD,STA(MIN)
t
SU,STA(MIN)
t
SU,STO(MIN)
t
HD,DATI(MIN)
t
HD,DATO(MIN)
t
SU,DAT(MIN)
t
SP(MAX)
t
RST
C
X
Conversion Rate (Continuous Mode)
Conversion Time (Snapshot Mode)
ADIN Pin Input Resistance
ADIN Pin Input Current
ADR0, ADR1 Input High Threshold
ADRO, ADRI Input Low Threshold
ADRO, ADRI Input Current
SDA,
SDAO
Output Low Voltage
SDA, SDAI,
SDAO,
SCL Input Current
SDA, SDAI, SCL Input Threshold
SDA, SDAI, SCL Clamp Voltage
Maximum SCL Clock Frequency
Minimum SCL Low Period
Minimum SCL High Period
Minimum Bus Free Time Between Stop/
Start Condition
Minimum Hold Time After (Repeated)
Start Condition
Minimum Repeated Start Condition
Set-Up Time
Minimum Stop Condition Set-Up Time
Minimum Data Hold Time Input
Minimum Data Hold Time Output
Minimum Data Set-Up Time Input
Maximum Suppressed Spike
Pulse Width
Stuck-Bus Reset Time
SCL, SDA Input Capacitance
SCL or SDA/SDAI Held Low
I
SDA
, I
SDAI
, I
SCL
= 3mA
ADR0, ADR1 = 0V or 3V
ADR0, ADR1 = 0.8V or 2.2V
I
SDA
, I
SDAO
= 8mA
SDA, SDAI,
SDAO,
SCL = 5V
(SENSE
+
– SENSE
–
)
ADIN, V
IN
ADIN = 3V
ADIN = 3V
6
53
26
2
7.5
67
33
10
9
85
42
±2
Hz
ms
ms
MΩ
μA
V
V
μA
μA
V
μA
V
V
kHz
l
l
l
l
l
l
l
l
l
l
l
l
2.3
0.3
±8
2.65
0.6
2.9
0.9
±70
0.15
0
1.6
5.5
400
0.65
50
0.12
140
30
30
–100
300
50
20
600
30
110
33
5
1.8
6.1
0.4
±2
2
6.6
I
2
C Interface Timing (Note 4)
1.3
600
1.3
600
600
600
0
900
100
250
μs
ns
μs
ns
ns
ns
ns
ns
ns
ns
ms
10
pF
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
Internal clamps limit the SCL, SDA (LTC4151) and SDAI
(LTC4151-1) pins to a minimum of 5.5V. Driving these pins to voltages
beyond the clamp may damage the part. The pins can be safely tied to
higher voltages through a resistor that limits the current below 5mA.
Note 3:
All currents into pins are positive. All voltages are referenced to
GND, unless otherwise noted.
Note 4:
Guaranteed by design and not subject to test.
Note 5:
Integral nonlinearity and total unadjusted error of V
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