Linear LTC4151, LTC4151-1, LTC4151CS-2, LTC4151IS-2 Schematics

LTC4151

High Voltage I2C Current

and Voltage Monitor

FEATURES

n

Wide Operating Voltage Range: 7V to 80V

n

12-Bit Resolution for Both Current and Voltages

n

I2C Interface

n

Additional ADC Input Monitors an External Voltage

n

Continuous Scan and Snapshot Modes

n

Shutdown Mode (LTC4151) Reduces Quiescent

Current to 120μA

n

Split SDA for Opto-isolation (LTC4151-1/LTC4151-2)

n

Available in 10-Lead MSOP, 10-Lead 3mm × 3mm

DFN and 16-Lead SO Packages

APPLICATIONS

n

Telecom Infrastructure

n

Automotive

n

Industrial

n

Consumer

DESCRIPTION

The LTC®4151 is a high side power monitor that operates 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 by a host. The LTC4151 can also perform on-demand measurement in a snapshot mode. The LTC4151 features a dedicated shutdown pin to reduce power consumption. The LTC4151-1/LTC4151-2 feature split I drive opto-isolators. The data out on the LTC4151-1 is inverted while that on the LTC4151-2 is not.

PART PACKAGE FEATURED PIN

LTC4151 DD10, MS10 SHDN

LTC4151-1 DD10, MS10 SDAO

LTC4151-2 S16 SDAO

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.

2

C interface when polled

2

C data pins to

TYPICAL APPLICATION

High Side Power Sensing with Onboard ADC and I2C

V

IN

ADR1

ADR0

SENSE

0.02Ω

+

LTC4151

GND

SENSE

–

SHDN

SCL

SDA

ADIN

V

OUT

V

7V to 80V

IN

MEASURED VOLTAGE

2k 2k

μCONTROLLER

SCL

SDA

3.3V

V

4151 TA01

12-Bit ADC DNL and INL

1.0

0.5

0

ADC DNL (LSB)

DD

–0.5

–1.0

0

1.0

0.5

0

ADC INL (LSB)

–0.5

–1.0

0

1024

2048 CODE

3072

4096

4151 TA01b

4096

4151 TA01c

4151fb

1

LTC4151

ABSOLUTE MAXIMUM RATINGS

VIN Voltage ................................................. –0.3V to 90V

SENSE

ADR1, ADR0 Voltages .............................. –0.3V to 90V

ADIN, SHDN, SDAO, SDAO Voltages ........... –0.3V to 6V

SCL, SDA, SDAI Voltages (Note 2) ........... –0.3V to 5.5V

SCL, SDA, SDAI Clamp Current .............................. 5mA

+

, SENSE– Voltages .......................... VIN – 10V or

–0.3V to V

IN

(Notes 1, 3)

+ 0.3V

Operating Temperature Range

LTC4151C/LTC4151C-1/LTC4151C-2 ........ 0°C to 70°C

LTC4151I/LTC4151I-1/LTC4151I-2 .......–40°C to 85°C

Storage Temperature Range

MSOP, SO ........................................... –65°C to 150°C

DFN .................................................... – 65°C to 125°C

Lead Temperature (Soldering, 10 sec)

MSOP, SO .......................................................... 300°C

PIN CONFIGURATION

LTC4151 LT4151

SENSE

V

IN

ADR1

ADR0

ADIN

10-LEAD (3mm s 3mm) PLASTIC DFN

EXPOSED PAD (PIN 11) PCB GND CONNECTION OPTIONAL

LTC4151-1 LTC4151-1

TOP VIEW

+

1

2

3

4

5

DD PACKAGE

T

= 125°C, θJA = 45°C/W

JMAX

TOP VIEW

9

8

7

6

SENSE

GND

SHDN

SDA

SCL

–

10

11

+

SENSE

1

V

2

IN

ADR1

3

ADR0

4

ADIN

5

10-LEAD PLASTIC MSOP

T

JMAX

TOP VIEW

10 9 8 7 6

MS PACKAGE

= 125°C, θJA = 85°C/W

SENSE GND

SHDN

SDA SCL

–

LTC4151-2

9

8

7

6

SENSE

GND

SDAO

SDAI

SCL

–

SENSE

+

SENSE

1

V

2

IN

ADR1

ADR0

ADIN

10-LEAD (3mm s 3mm) PLASTIC DFN

T

EXPOSED PAD (PIN 11) PCB GND CONNECTION OPTIONAL

JMAX

11

3

4

5

DD PACKAGE

= 125°C, θJA = 45°C/W

10

+

1

2

V

IN

3

NC

4

NC

5

ADR1

6

NC

7

ADR0

8

NC

16-LEAD PLASTIC SO

T

JMAX

TOP VIEW

16

15

14

13

12

11

10

9

S PACKAGE

= 150°C, θJA = 100°C/W

SENSE

NC

GND

SDAO

SDAI

SCL

ADIN

TOP VIEW

+

SENSE

1

V

2

IN

ADR1

3

ADR0

4

ADIN

5

MS PACKAGE

10-LEAD PLASTIC MSOP

T

= 125°C, θJA = 85°C/W

JMAX

–

10 9 8 7 6

SENSE GND

SDAO

SDAI SCL

–

2

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LTC4151

ORDER INFORMATION

LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE

LTC4151CDD#PBF LTC4151CDD#TRPBF LCWZ 10-Lead (3mm x 3mm) Plastic DFN 0°C to 70°C

LTC4151IDD#PBF LTC4151IDD#TRPBF LCWZ 10-Lead (3mm x 3mm) Plastic DFN –40°C to 85°C

LTC4151CDD-1#PBF LTC4151CDD-1#TRPBF LCXC 10-Lead (3mm x 3mm) Plastic DFN 0°C to 70°C

LTC4151IDD-1#PBF LTC4151IDD-1#TRPBF LCXC 10-Lead (3mm x 3mm) Plastic DFN –40°C to 85°C

LTC4151CMS#PBF LTC4151CMS#TRPBF LTCWY 10-Lead Plastic MSOP 0°C to 70°C

LTC4151IMS#PBF LTC4151IMS#TRPBF LTCWY 10-Lead Plastic MSOP –40°C to 85°C

LTC4151CMS-1#PBF LTC4151CMS-1#TRPBF LTCXB 10-Lead Plastic MSOP 0°C to 70°C

LTC4151IMS-1#PBF LTC4151IMS-1#TRPBF LTCXB 10-Lead Plastic MSOP –40°C to 85°C

LTC4151CS-2#PBF LTC4151CS-2#TRPBF LTC4151S-2 16-Lead Plastic SO 0°C to 70°C

LTC4151IS-2#PBF LTC4151IS-2#TRPBF LTC4151S-2 16-Lead Plastic SO –40°C to 85°C

Consult LTC Marketing for parts speciﬁ ed with wider operating temperature ranges. *The temperature grade is identiﬁ ed by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based ﬁ nish parts.

For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel speciﬁ cations, go to: http://www.linear.com/tapeandreel/

The l denotes the speciﬁ cations which apply over the full operating

ELECTRICAL CHARACTERISTICS

temperature range, otherwise speciﬁ cations are at TA = 25°C. VIN is from 7V to 80V, unless noted. (Note 3)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

General

V

IN

I

IN

I

SENSE

I

SENSE

V

SHDN(TH)

I

SHDN

+

–

Supply Voltage

Supply Current VIN = 48V, Normal Operation Mode

V

= 12V, Shutdown Mode

IN

SENSE+ Input Current VIN, SENSE+, SENSE– = 48V

SENSE– Input Current VIN, SENSE+, SENSE– = 48V

SHDN Input Threshold

SHDN Input Current SHDN = 0V

ADC

RES Resolution (No Missing Codes) (Note 4)

V

FS

Full-Scale Voltage (SENSE+ – SENSE–)

V

IN

ADIN

LSB LSB Step Size (SENSE

+

IN

– SENSE–) V ADIN

TUE Total Unadjusted Error (SENSE+ – SENSE–)

V

(Note 5)

IN

ADIN, LTC4151C, LTC4151C-1, LTC4151C-2 ADIN, LTC4151I, LTC4151I-1, LTC4151I-2

V

OS

Offset Error (SENSE+ – SENSE–)

V

(Note 6)

IN

ADIN

V

(Note 5)

IN

+

– SENSE–)

INL Integral Nonlinearity (SENSE

ADIN

l

780V

l l

l

1 1.5 2 V

l

–3 –5 –8 μA

l

12 Bits

1.2

120

1.7

300

mA

μA

59 μA

0.1 1 μA

81.92

mV

102.4

2.048

20 25

0.5

l l l l

l l l

±1 ±1

±0.5

±1.25

±1

±0.75

±1

±5 ±6 ±8

±3 ±3 ±2

μV mV mV

LSB LSB LSB

V V

% % % %

4151fb

3

LTC4151

ELECTRICAL CHARACTERISTICS

The l denotes the speciﬁ cations which apply over the full operating temperature range, otherwise speciﬁ cations are at T

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

σ

T

f

CONV

t

CONV

R

ADIN

I

ADIN

2

C Interface

I

V

ADR(H)

V

ADR(L)

I

ADR(IN)

V

SDA(OL)

I

SDA,SCL(IN)

V

SDA,SCL(TH)

V

SDA,SCL(CL)

2

C Interface Timing (Note 4)

I

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

Transition Noise (SENSE+ – SENSE–)

Conversion Rate (Continuous Mode)

Conversion Time (Snapshot Mode) (SENSE+ – SENSE–)

ADIN Pin Input Resistance ADIN = 3V

ADIN Pin Input Current ADIN = 3V

ADR0, ADR1 Input High Threshold

ADRO, ADRI Input Low Threshold

ADRO, ADRI Input Current ADR0, ADR1 = 0V or 3V

SDA, SDAO, SDAO Output Low Voltage I

SDA, SDAI, SDAO, SDAO, SCL Input

Current

SDA, SDAI, SCL Input Threshold

SDA, SDAI, SCL Clamp Voltage I

Maximum SCL Clock Frequency 400 kHz

Minimum SCL Low Period 0.65 1.3 μs

Minimum SCL High Period 50 600 ns

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 30 600 ns

Minimum Data Hold Time Input –100 0 ns

Minimum Data Hold Time Output 300 600 900 ns

Minimum Data Set-Up Time Input 30 100 ns

Maximum Suppressed Spike

Pulse Width

Stuck-Bus Reset Time SCL or SDA/SDAI Held Low 20 33 ms

SCL, SDA Input Capacitance 510 pF

= 25°C. VIN is from 7V to 80V, unless noted. (Note 3)

A

V

IN

ADIN

l

6 7.5 9 Hz

l

53

ADIN, V

IN

ADR0, ADR1 = 0.8V or 2.2V

, I

SDA

SDAO

= 8mA

SDA, SDAI, SDAO, SDAO, SCL = 5V

, I

SDA

SDAI

SCL

= 3mA

l

26

l

210

l

2.3 2.65 2.9 V

l

0.3 0.6 0.9 V

l l

±8

l

1.6 1.8 2 V

l

5.5 6.1 6.6 V

50 110 250 ns

1.2

0.3 22

67 33

85 42

μV

mV

μV

RMS RMS RMS

ms ms

MΩ

±2 μA

±70 μA

μA

0.15 0.4 V

0±2 μA

0.12 1.3 μs

140 600 ns

30 600 ns

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/LTC4151-2) 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.

4

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

are tested

IN

between 7V and 80V. Note 6: Offset error of V

is deﬁ ned by extrapolating the straight line

IN

measured between 7V and 80V.

4151fb

LTC4151

TYPICAL PERFORMANCE CHARACTERISTICS

Supply Current vs Supply Voltage (Normal Mode)

1.30

1.15

1.00

SUPPLY CURRENT (mA)

0.85

0.70 0

ADC Total Unadjusted Error vs Code (ADIN Voltage)

0.10

– 40°C

25°C

85°C

20

40

SUPPLY VOLTAGE (V)

60

80

4151 G01

ADC DNL vs Code (ADIN Voltage)

1.0

400

300

200

SUPPLY CURRENT (μA)

100

0

= 12V, TA = 25°C, unless noted.

V

IN

Supply Current vs Supply Voltage (Shutdown Mode)

– 40°C

25°C

85°C

0

20

40

SUPPLY VOLTAGE (V)

60

4151 G02

ADC INL vs Code (ADIN Voltage)

1.0

80

0.05

0

–0.05

ADC TOTAL UNADJUSTED ERROR (%)

–0.10

0

1024

2048

CODE

3072

4151 G03

4096

0.5

0

ADC DNL (LSB)

–0.5

–1.0

0

1024

2048 CODE

3072

4096

4151 G04

0.5

0

ADC INL (LSB)

–0.5

–1.0

0

1024

2048 CODE

ADC Total Unadjusted Error vs Code (SENSE Voltage) ADC DNL vs Code (SENSE Voltage) ADC INL vs Code (SENSE Voltage)

1.0

0.5

0

–0.5

ADC TOTAL UNADJUSTED ERROR (%)

–1.0

0

1024

2048 CODE

3072

4151 G06

4096

2

1

0

ADC DNL (LSB)

–1

–2

0

1024

2048 CODE

3072

4096

4151 G07

2

1

0

ADC INL (LSB)

–1

–2

0

1024

2048 CODE

3072

4096

4151 G05

4096

4151 G08

4151fb

5

LTC4151

TYPICAL PERFORMANCE CHARACTERISTICS

SDA, SDAO, SDAO Output Low vs Pull-Up Current (V

0.5

0.4

0.3

(V)

SDA(OL)

0.2

V

0.1

0

I

SDA

10

(mA)

5

SDA(OL)

vs I

15

SDA

85°C

25°C

– 40°C

4151 G09

)

20

6.3

6.2

(V)

6.1

SDA,SCL(CL)

V

6.0

5.9

0.01 0.1 1 10

PIN FUNCTIONS

SENSE+: Kelvin Sense of the VIN Pin. See Figure 10 for recommended Kelvin connection.

: Supply Voltage Input. Accepts 7V to 80V. The voltage

V

IN

at this pin is monitored by the onboard ADC with a full-

+

scale input range of 102.4V. SENSE

for proper ADC readout.

to V

IN

2

ADR1, ADR0: I ADR1 and ADR0 to V

C Device Address Inputs. Connecting

, GND or leaving the pins open

IN

must be connected

conﬁ gures one of nine possible addresses. See Table 1 in the Applications Information section for details.

ADIN: ADC Input. The onboard ADC measures voltage range between 0V and 2.048V. Tie to GND if unused.

2

SCL: I

C Bus Clock Input. Data is shifted in and out at the SDA pin on rising edges of SCL. This pin is driven by an open-collector output from a master controller. An external pull-up resistor or current source is required and can be placed between SCL and V

. The voltage at SCL

IN

is internally clamped to 6V (5.5V minimum).

2

SDA (LTC4151 Only): I

C Bus Data Input/Output. Used for shifting in address, command or data bits and sending out data. An external pull-up resistor or current source

is required and can be placed between SDA and V The voltage at SDA is internally clamped to 6V (5.5V minimum).

SDAI (LTC4151-1/LTC4151-2 Only): I Used for shifting in address, command or data bits. This pin is driven by an open-collector output from a master controller. An external pull-up resistor or current source is required and can be placed between SDAI and V age at SDAI is internally clamped to 6V (5.5V minimum).

SDAO (LTC4151-2 Only): Serial Bus Data Output. Opendrain output used for sending data back to the master controller or acknowledging a write operation. Normally tied to SDAI to form the SDA line. An external pull-up resistor or current source is required.

SDAO (LTC4151-1 Only): Inverted Serial Bus Data Out- put. Open-drain output used for sending data back to the master controller or acknowledging a write operation. Data is inverted for convenience of opto-isolation. An external pull-up resistor or current source is required.

SHDN (LTC4151 Only): Shutdown Input. Internally pulled up to 6.3V. Pull this pin below 1V to force the LTC4151 into shutdown mode. Leave this pin open if unused.

VIN = 12V, TA = 25°C, unless noted.

SDA, SDAI, SCL Clamp Voltage vs Load Current

– 40°C

25°C

85°C

I

(mA)

LOAD

4151 G10

2

C Bus Data Input.

. The volt-

IN

.

6

4151fb