Datasheet

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LTC4151

4151ff

For more information www.linear.com/LTC4151

Typical applicaTion

FeaTures

applicaTions

DescripTion

High Voltage I

C Current

and Voltage Monitor

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

C interface when polled

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

C data pins to

drive opto-isolators. The data out on the LTC4151-1 is

inverted while that on the LTC4151-2 is not.

High Side Power Sensing with Onboard ADC and I

Wide Operating Voltage Range: 7V to 80V

12-Bit Resolution for Both Current and Voltages

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 Opto-Isolation (LTC4151-1/LTC4151-2)

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

DFN and 16-Lead SO Packages

–48V Telecom Infrastructure

Automotive

Industrial

Consumer

12-Bit ADC DNL and INL

4151 TA01

3.3V

0.02Ω

µCONTROLLER

GND

LTC4151

SHDN

7V TO 80V

OUT

MEASURED

VOLTAGE

SCL

SDA

ADIN

ADR1

SCL

2k 2k

SDA

ADR0

GND

SENSE

–

CODE

ADC DNL (LSB)

0.5

4096

–0.5

–1.0

1024

2048

3072

1.0

4151 TA01b

CODE

ADC INL (LSB)

0.5

4096

–0.5

–1.0

1024

2048

3072

1.0

4151 TA01c

PART PACKAGE FEATURED PIN

LTC4151 DD10, MS10 SHDN

LTC4151-1 DD10, MS10 SDAO

LTC4151-2 S16 SDAO

L, LT , LT C , LT M , Linear Technology and the Linear logo are registered trademarks and

Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners.

Summary of content (18 pages)

PAGE 1
LTC4151 High Voltage I2C Current and Voltage Monitor Features n n n n n n n n Description Wide Operating Voltage Range: 7V to 80V 12-Bit Resolution for Both Current and Voltages I2C Interface Additional ADC Input Monitors an External Voltage Continuous Scan and Snapshot Modes Shutdown Mode (LTC4151) Reduces Quiescent Current to 120µA Split SDA for Opto-Isolation (LTC4151-1/LTC4151-2) Available in 10-Lead MSOP, 10-Lead 3mm × 3mm DFN and 16-Lead SO Packages The LTC®4151 is a high side power monitor that o
PAGE 2
LTC4151 Absolute Maximum Ratings (Notes 1, 3) VIN Voltage.................................................. –0.3V to 90V SENSE+, SENSE – Voltages............................VIN – 10V or –0.3V to VIN + 0.3V 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................................
PAGE 3
LTC4151 Order Information LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4151CDD#PBF LTC4151CDD#TRPBF LCWZ 10-Lead (3mm × 3mm) Plastic DFN 0°C to 70°C LTC4151IDD#PBF LTC4151IDD#TRPBF LCWZ 10-Lead (3mm × 3mm) Plastic DFN –40°C to 85°C LTC4151HDD#PBF LTC4151HDD#TRPBF LCWZ 10-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C LTC4151CDD-1#PBF LTC4151CDD-1#TRPBF LCXC 10-Lead (3mm × 3mm) Plastic DFN 0°C to 70°C LTC4151IDD-1#PBF LTC4151IDD-1#TRPBF LCXC 1
PAGE 4
LTC4151 Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN is from 7V to 80V, unless noted.
PAGE 5
LTC4151 Typical Performance Characteristics Supply Current vs Supply Voltage (Normal Mode) Supply Current vs Supply Voltage (Shutdown Mode) 400 1.15 – 40°C SUPPLY CURRENT (µA) SUPPLY CURRENT (mA) 1.30 25°C 1.00 85°C 0.85 0.70 VIN = 12V, TA = 25°C, unless noted. 40 60 20 SUPPLY VOLTAGE (V) 0 300 25°C 200 85°C 100 0 80 – 40°C 40 60 20 SUPPLY VOLTAGE (V) 0 4151 G01 4151 G02 ADC DNL vs Code (ADIN Voltage) 1.0 0.05 0.5 0.5 –0.05 –0.10 ADC INL (LSB) 1.
PAGE 6
LTC4151 Typical Performance Characteristics 0.5 SDA, SDAO, SDAO Output Low vs Pull-Up Current (VSDA(OL) vs ISDA ) 6.3 VIN = 12V, TA = 25°C, unless noted. SDA, SDAI, SCL Clamp Voltage vs Load Current 85°C 0.4 6.2 0.3 – 40°C 0.2 6.1 – 40°C 6.0 0.1 0 VSDA,SCL(CL) (V) VSDA(OL) (V) 25°C 25°C 0 5 10 15 20 85°C 5.9 0.01 ISDA (mA) 0.1 1 10 ILOAD (mA) 4151 G09 4151 G10 Pin Functions ADIN: ADC Input. The onboard ADC measures voltage range between 0V and 2.048V. Tie to GND if unused.
PAGE 7
LTC4151 Pin Functions 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. Block Diagram VIN: Supply Voltage Input. Accepts 7V to 80V. The voltage at this pin is monitored by the onboard ADC with a fullscale input range of 102.4V. SENSE+ must be connected to VIN for proper ADC readout. RS VIN 2k SENSE+ SENSE– 6.
PAGE 8
LTC4151 Applications Information The LTC4151 offers a compact complete solution for high side power monitoring. With a wide operating voltage range from 7V to 80V, this device is ideal for a variety of applications including consumer, automotive, industrial and telecom infrastructure. The simple application circuit as shown in Figure 1 provides monitoring of high side current with a 0.02W resistor (4.096A in full scale), input voltage (102.4V in full scale) and an external voltage (2.
PAGE 9
LTC4151 Applications Information I2C Interface The LTC4151 features an I2C-compatible interface to provide access to six ADC data registers and a control register for monitoring the measured voltages. Figure 2 shows a general data transfer format using the I2C. The LTC4151is a read-write slave device and supports SMBus Read Byte, Write Byte, Read Word and Write Word commands. The device also supports Read Page and Write Page commands that allow one to read or write more than two bytes of data.
PAGE 10
LTC4151 Applications Information Using Opto-Isolators with LTC4151-1 and LTC4151-2 Start and Stop Conditions The LTC4151-1/LTC4151-2 split the SDA line into SDAI (input) and SDAO (LTC4151-1 inverted output) or SDAO (LTC4151-2 output) for convenience of opto-coupling with a host controller that sits at a different ground level. When the I2C bus is idle, both SCL and SDA must remain in the high state.
PAGE 11
LTC4151 Applications Information I2C Device Addressing Nine distinct I2C bus addresses are configurable using the three-state pins ADR0 and ADR1, as shown in Table 1. Address bits a6, a5 and a4 are configured to (110) and the least significant bit is the R/W bit. In addition, the LTC4151 will respond to a mass write address (1100 110) b for writing to all LTC4151s, regardless of their individual address settings.
PAGE 12
LTC4151 Applications Information Table 2.
PAGE 13
LTC4151 Applications Information address with the R/W bit now set to one. The LTC4151 acknowledges and sends the contents of the requested register. The transmission terminates when the master sends a Stop condition. If the master acknowledges the transmitted data byte, as in a Read Word command, the LTC4151 will send the contents of the next register.
PAGE 14
LTC4151 Typical Application Temperature Monitoring with an NTC Thermistor While Measuring Load Current and LTC4151 Supply Current 0.2Ω VIN 48V VISHAY 2381 615 4.104 100k AT 25°C 1% SENSE+ SENSE – 250mA LOAD VIN SCL I2C 40.2k 1% LTC4151 ADIN SDA ADR1 1.5k 1% GND ADR0 4151 TA02 T(°C) = 58.82 • (NADIN /NVIN – 0.1066), 20°C < T < 60°C. NADIN AND NVIN ARE DIGITAL CODES MEASURED BY THE ADC AT THE ADIN AND VIN PINS, RESPECTIVELY.
PAGE 15
LTC4151 Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. DD Package 10-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1699 Rev C) R = 0.125 TYP 6 0.40 ± 0.10 10 0.70 ±0.05 3.55 ±0.05 1.65 ±0.05 2.15 ±0.05 (2 SIDES) 3.00 ±0.10 (4 SIDES) 1.65 ± 0.10 (2 SIDES) PIN 1 NOTCH R = 0.20 OR 0.35 × 45° CHAMFER PIN 1 PACKAGE TOP MARK OUTLINE (SEE NOTE 6) 0.25 ± 0.05 5 0.75 ±0.05 0.200 REF 0.50 BSC 2.38 ±0.05 (2 SIDES) 0.00 – 0.
PAGE 16
LTC4151 Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. S Package 16-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610 Rev G) .386 – .394 (9.804 – 10.008) NOTE 3 .045 ±.005 .050 BSC 16 N 14 13 12 11 10 9 N .245 MIN .160 ±.005 .150 – .157 (3.810 – 3.988) NOTE 3 .228 – .244 (5.791 – 6.197) 1 .030 ±.005 TYP 15 2 3 N/2 N/2 RECOMMENDED SOLDER PAD LAYOUT .010 – .020 × 45° (0.254 – 0.508) .
PAGE 17
LTC4151 Revision History (Revision history begins at Rev C) REV DATE DESCRIPTION C 11/10 Added H-grade information PAGE NUMBER 2, 3 Revised order of Pin Functions section and added information to SDAI pin description 6 Added diode and 2k resistor to Block Diagram 7 Added information to Application Information section 10 D 7/12 Changed part number in Pin Configuration section from LT4151 to LTC4151 2 E 11/12 Added –48V application schematic 14 F 3/14 Increased VADR(H) MAX limit and d
PAGE 18
LTC4151 Typical Application High Side Current, Input Voltage and Open Fuse Monitoring with a Single LTC4151 VIN1 48V F1 D1 F2 D2 RS 0.02Ω VIN2 48V D3 D4 R1 150k R2 301k SENSE+ SENSE– VIN SCL V+ I2C LTC4151 LOAD ADR1 ADIN R3 3.4k SDA V– ADR0 GND GND 4151 TA03 CONDITION RESULT NADIN ≥ 1.375 • NVIN Normal Operation 0.835 • NVIN ≤ NADIN < 1.375 • NVIN F2 is Open 0.285 • NVIN ≤ NADIN < 0.