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FEATURES

■

LTC2970/LTC2970-1

Dual I

2

C Power

Supply Monitor and

Margining Controller

DESCRIPTIO

The LTC

®

2970 is a dual power supply monitor and

margining controller with an SMBus compatible I

2

C bus

interface. A low-drift, on-chip reference and 14-bit

ΔΣ

A/D

converter allow precise measurements of supply voltages,

load currents or internal die temperature. Fault manage-

ment allows

⎯

A

⎯

L

⎯

E

⎯

R

⎯

T to be asserted for conﬁgurable over

and under voltage fault conditions. Two voltage buffered,

8-bit IDACs allow highly accurate programming of DC/DC

converter output voltages. The IDACs can be conﬁgured

to automatically servo the power supplies to the desired

voltages using the ADC. The LTC2970-1 adds a tracking

feature that can be used to turn multiple power supplies

on or off in a controlled manner.

The bus address is set to 1 of 9 possible combinations by

pin strapping the ASEL0 and ASEL1 pins. The LTC2970/

LTC2970-1 are packaged in the 24-lead, 4mm

×

5mm

QFN package.

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

■

Less Than ±0.5% Total Unadjusted Error 14-Bit

ΔΣ

ADC with On-Chip Reference

Dual, 8-Bit IDACs with 1x Voltage Buffers

Linear, Voltage Servo Adjusts Supply Voltages by

Ramping IDAC Outputs Up/Down

I

2

C™ Bus Interface (SMBus Compatible)

Extensive, User Conﬁgurable Fault Monitoring

On-Chip Temperature Sensor

Available in 24-Lead 4mm

×

5mm QFN Package

APPLICATIO S

■

Dual Power Supply Voltage Servo

Monitoring Supply Voltage and Current

Programmable Power Supplies

Programmable Reference

TYPICAL APPLICATIO

Dual Power Supply Monitor and Controller (One of Two Channels Shown)

8V TO 15V

0.1μF

12V

IN

V

IN

OUT

1/2 LTC2970

GPIO_CFG

I+

I–

DC/DC

CONVERTER

V

IN0_BM

V

IN0_BP

V

OUT0

V

IN0_AP

RUN/SS

FB

LOAD

I

OUT0

V

IN0_AM

ALERT

SCL

SDA

I

2

C BUS

SMBUS

COMPATIBLE

V

DD

ERROR (%)

0.1μF

0.25

(

)

GPIO_0

REF

0.1μF

GND

SGND

GND ASEL0 ASEL1

29701 TA01

U

ADC Total Unadjusted Error

vs Temperature

0.50

15 PARTS MOUNTED ON PCB

0

–0.25

–0.50

–50

ADC V

IN

= 5V

–25

50

25

TEMPERATURE (°C)

0

75

100

29701 TA01b

29701fc

1

LTC2970/LTC2970-1

ABSOLUTE

(Notes 1 and 2)

AXI U RATI GS

Supply Voltages:

V

DD

......................................................... –0.3V to 6V

12V

IN

.................................................... –0.3V to 15V

Digital Input/Output Voltages:

ASEL0, ASEL1 ............................ –0.3V to V

DD

+ 0.3V

SDA, SCL, GPIO_CFG,

⎯

A

⎯

L

⎯

E

⎯

R

⎯

T, GPIO_0, GPIO_1.......................... –0.3V to 6V

Analog Voltages:

V

IN0_AP

, V

IN0_AM

, V

IN0_BP

,

V

IN0_BM

, V

IN1_AP

, V

IN1_AM

,

V

IN1_BP

, V

IN1_BM

, V

OUT0

, V

OUT1

.............. –0.3V to 6V

I

OUT0

, I

OUT1

, REF......................... –0.3V to V

DD

+ 0.3V

RGND.................................................... –0.3V to 0.3V

Operating Temperature Range:

LTC2970C ................................................ 0°C to 70°C

LTC2970I ............................................. –40°C to 85°C

Storage Temperature Range...................– 65°C to 125°C

Lead Temperature (Soldering, 10 sec) .................. 300°C

24 23 22 21 20

V

IN0_AP

1

V

IN0_AM

2

V

IN0_BP

3

V

IN0_BM

4

V

IN1_AP

5

V

IN1_AM

6

V

IN1_BP

7

8

V

IN1_BM

9 10 11 12

12V

IN

V

OUT0

V

OUT1

V

DD

25

19 SDA

18 SCL

17 ALERT

16 GPIO_0

15 GPIO_1

14 I

OUT0

13 I

OUT1

UFD PACKAGE

24-LEAD (4mm

×

5mm) PLASTIC QFN

T

JMAX

= 125°C,

θ

JA

= 37°C/W

EXPOSED PAD (PIN 25) IS GND MUST BE SOLDERED TO PCB

ORDER INFORMATION

LEAD FREE FINISH

LTC2970CUFD#PBF

LTC2970CUFD-1#PBF

LTC2970IUFD#PBF

LTC2970IUFD-1#PBF

TAPE AND REEL

LTC2970CUFD#TRPBF

LTC2970CUFD-1#TRPBF

LTC2970IUFD#TRPBF

LTC2970IUFD-1#TRPBF

PART MARKING*

2970

29701

2970

29701

PACKAGE DESCRIPTION

24-Lead (4mm

×

5mm) Plastic DFN

24-Lead (4mm

×

5mm) Plastic DFN

24-Lead (4mm

×

5mm) Plastic DFN

24-Lead (4mm

×

5mm) Plastic DFN

TEMPERATURE RANGE

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.

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/

GPIO_CFG

ASEL0

ASEL1

RGND

REF

2

U

W W

W

PIN CONFIGURATION

TOP VIEW

29701fc

LTC2970/LTC2970-1

The

●

denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at T

A

= 25°C. V

12VIN

= 12V, V

DD

and REF pins ﬂoating unless otherwise indicated,

C

VDD

= 100nF and C

REF

= 100nF.

SYMBOL

I

V12

I

DD

V

LKO

V

DD

PARAMETER

12V

IN

Supply Current

V

DD

Supply Current

V

DD

Undervoltage Lockout

V

DD

Undervoltage Lockout Hysteresis

Supply Input Operating Range

Regulator Output Voltage

Temperature Coefﬁcient

Regulator Output Voltage Load

Regulation

Regulator Line Regulation

V

12VIN

V

REF

12V

IN

Supply Operating Range

Reference Output Voltage

Reference Voltage Temperature

Coefﬁcient

Reference Overdrive Voltage Input

Range

ADC Characteristics

N_ADC

TUE_ADC

INL_ADC

DNL_ADC

V

IN_ADC

V

OS_ADC

GAIN_ADC

T

CONV_ADC

C

IN_ADC

F

IN_ADC

I

LEAK_ADC

N_I

OUT

INL_I

OUT

DNL_I

OUT

I

FS-

I

OUT

I

DRIFT-

I

OUT

I

OS-

I

OUT

Resolution

Total Unadjusted Error

Integral Nonlinearity

Differential Nonlinearity

Input Voltage Range

Offset Error

Offset Error Drift

Gain Error

Gain Error Drift

Conversion Time

Input Sampling Capacitance

Input Sampling Frequency

Input Leakage Current

Resolution (Guaranteed Monotonic)

Integral Nonlinearity

Differential Nonlinearity

Full-Scale Output Current

Output Current Drift

Offset Current

V

IOUTn

< V

DD

– 1.5V

V

IOUTn

< V

DD

– 1.5V

V

IOUTn

< V

DD

– 1.5V, DAC Code = 'hff

DAC Code = 'hff

DAC Code = 'h00

●

ELECTRICAL CHARACTERISTICS

CONDITIONS

V

12VIN

= 12V, V

DD

Floating

V

DD

= 5V, V

12VIN

= V

DD

V

DD

Ramping-Down, V

12VIN

= V

DD

●

MIN

TYP

4.24

3.7

MAX

7.5

5

4.4

5.75

UNITS

mA

V

mV

V

ppm/°C

ppm/mA

ppm/V

Power-Supply Characteristics

3.7

4.5

4.75

4.14

118

8V ≤ V

12VIN

≤ 15V, –1mA ≤ I

VDD

≤ 0

●

4.95

10

5.25

–1mA ≤ I

VDD

≤ 0

8V ≤ V

12VIN

≤ 15V, I

VDD

= 0mA

●

160

80

–5

8

1.229

2

1

1.5

–34

–63

15

Regulator Output Short-Circuit Current V

12VIN

= 12V, V

DD

= 0V

Voltage Reference Characteristics

mA

V

ppm/°C

V

N_ADC = 8.192V/16384

V

IN

= 3V, V

IN

= V

INn_xP

– V

INn_xM

(Note 3)

(Note 4)

(Note 7)

●

500

±0.5

–4.5

0

–1000

–316

0.19

2

4.5

±0.5

6

1000

±0.4

3

33.3

3

61.4

μV/LSB

%

LSB

V

μV

μV/°C

%

ppm/°C

ms

pF

kHz

±0.1

μA

Bits

±1

LSB

μA

ppm/°C

±0.1

μA

29701fc

Full-Scale V

IN

= 6V

●

0V < V

IN

< 6V

●

IDAC Output Current Characteristics

8

–236

–255

32

–276

3

LTC2970/LTC2970-1

ELECTRICAL CHARACTERISTICS

SYMBOL

INL_V

OUT

DNL_V

OUT

V

OS-

V

OUT

V

OUT

PARAMETER

Integral Nonlinearity

Differential Nonlinearity

Offset Voltage

Output Voltage Drift

Load Regulation

Leakage Current

Short-Circuit Current Low

Short-Circuit Current High

V

OS

TMP

GAIN_12V

IN

V

IH

V

IL

V

HYST

I

LEAK

C

IN

V

IH_ASEL

V

IL_ASEL

I

IN,HL

I

IN,Z

V

OL

I

OH

Offset Voltage

Gain

Input High Threshold Voltage

Input Low Threshold Voltage

Input Hysteresis

Input Leakage Current

Input Capacitance

Input High Threshold Voltage

Input Low Threshold Voltage

High, Low Input Current

High Z Input Current

Output Low Voltage

Input Leakage Current

I

SINK

= 3mA

0V ≤ V

IN

≤ 6V

ASEL[1:0] = 0, V

DD

●

The

●

denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at T

A

= 25°C. V

12VIN

= 12V, V

DD

and REF pins ﬂoating unless otherwise indicated,

C

VDD

= 100nF and C

REF

= 100nF.

CONDITIONS

R

IOUTn

= 10kΩ, No Load on V

OUTn

(Note 5)

R

IOUTn

= 10kΩ, No Load on V

OUTn

(Note 5)

V

OS

= V

OUTn

– V

IOUTn

, No Load on V

OUTn

No Load on V

OUTn

0.1V < V

OUTn

< V

DD

– 1.5V, I

VOUTn

Source = 1mA

0.1V < V

OUTn

< V

DD

– 1.5V, I

VOUTn

Sink = 1mA

V

OUTn

High-Z, 0V ≤ V

OUTn

≤ V

DD

V

OUTn

Shorted to GND

V

OUTn

Shorted to V

DD

●

MIN

TYP

MAX

±1

UNITS

LSB

mV

μV/°C

ppm/mA

Voltage Buffered IDAC Output Characteristics

1.6

0.17

–57

100

1

±10

±100

–50

50

nA

mA

mV

°C/LSB

Soft Connect Comparator Characteristics (CMP0, CMP1)

±3

0.25

0.329

0.333

0.335

2.1

1.6

1.5

1.0

0.08

0V ≤ V

IN

≤ 6V

●

Temperature Sensor Characteristics

12V

IN

Voltage Divider Characteristics

V/V

V

±1

10

V

DD

– 0.5

0.5

±20

±2

0.4

±1

μA

pF

V

μA

V

μA

Digital Inputs SCL, SDA, GPIO_CFG, GPIO_0, GPIO_1

SDA, SCL

GPIO_CFG, GPIO_0, GIPO_1

SDA, SCL

GPIO_CFG, GPIO_0, GIPO_1

●

Three State Inputs ASEL[1:0]

Open Drain Outputs SDA, GPIO_CFG, GPIO_0, GPIO_1,

⎯

A

⎯

L

⎯

E

⎯

R

⎯

T

●

29701fc

4

LTC2970/LTC2970-1

ELECTRICAL CHARACTERISTICS

SYMBOL

f

SCL

t

LOW

t

HIGH

t

BUF

t

HD,STA

t

SU,STA

t

SU,STO

t

HD,DAT

t

SU,DAT

t

SP

t

SETUP_GPIO

PARAMETER

Serial Clock Frequency

Serial Clock Low Period

Serial Clock High Period

Bus Free Time Between Stop and Start

Start Condition Hold Time

Start Condition Setup Time

Stop Condition Setup Time

I

2

C Interface Timing Characteristics

(Note 6)

●

The

●

denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at T

A

= 25°C.

CONDITIONS

MIN

10

1.3

0.6

1.3

600

0

300

100

98

2.5

900

TYP

MAX

400

UNITS

kHz

μs

ns

μs

Data Hold Time (LTC2970 Receiving Data)

(Note 6)

Data Hold Time (LTC2970 Transmitting Data)

Data Setup Time (LTC2970 Receiving Data)

Pulse Width of Spike Suppressed

GPIO_0 and GPIO_1 Setup Time

(Note 6)

GPIO_0 and GPIO_1 input setup time

prior to the 26th rising SCL of an IO()

I

2

C read. These inputs must be valid and

stable by this time to be returned in the

IO() read result. (Note 6)

GPIO_0 and GPIO_1 input hold time

after the 26th rising SCL of an IO() I

2

C

read. These inputs must be held until

this amount of time has elapsed to be

returned in the IO() read result. (Note 6)

GPIO_0 and GPIO_1 output delay after

the 35th rising SCL of an I

2

C write. These

outputs will become high impedance or

begin driving low by this time. (Note 6)

The LTC2970 will release the I

2

C bus and

terminate the current command if the

command is not completed before this

amount of time has elapsed.

After selecting a new ADC channel, the

LTC2970 will wait this amount of time

to allow the analog input to settle before

beginning an ADC conversion.

LTC2970-1 Only: The LTC2970-1 will

abort a pending SYNC() command if a

tracking command is not received before

this amount of time has elapsed.

LTC2970-1 Only: After the tracking

algorithm asserts CPIO_CFG low, the

LTC2970-1 will delay disconnecting the

IDACs from the power supply feedback

nodes by this amount of time. Used while

tracking power supplies on.

t

HOLD_GPIO

GPIO_0 and GPIO_1 Hold Time

●

2.5

μs

t

OUT_GPIO

GPIO_0 and GPIO_1 Output Time

●

2.5

μs

Internal Timers

t

TIMEOUT_SMB

Stuck BUS Timer

24

32

39

ms

t

SETUP_ADC

ADC Channel Setup Time

304

μs

t

TIMEOUT_

SYNC

Tracking SYNC Failure Timer

255

ms

t

HOLD_TRACK

Tracking IDAC Disconnect Delay

32

ms

29701fc

5

LTC2970IUFD-PBF

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