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LTC2915/LTC2916

Voltage Supervisor with

27 Selectable Thresholds

FEATURES

n

DESCRIPTION

The LTC

®

2915/LTC2916 are low voltage single-supply

monitors with selectable thresholds. The parts operate

from 1.5V to 5.5V and consume a quiescent current of

only 30μA.

Two three-state inputs select one of nine internally pro-

grammed thresholds without the need for external resistors.

For the LTC2915, an additional three-state input determines

the tolerance (–5%, –10%, –15%). The tolerance for the

LTC2916 is ﬁxed at –5%. Threshold accuracy is guaranteed

at ±1.5% over the entire operating temperature range.

Glitch ﬁltering ensures reliable reset operation without

false triggering.

The reset timeout may be set to 200ms or adjusted using

an external capacitor. A separate manual reset input on the

LTC2916 allows a simple push button interface.

Operation to 125°C makes the LTC2915 and LTC2916

suitable for automotive applications.

L,

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

ThinSOT is a trademark of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

n

9 Selectable Supply Voltages

12V, 5V, 3.3V, 2.5V, 1.8V

1.5V, 1.2V, 1.0V, +ADJ (0.5V)

3 Selectable Tolerances

–5%, –10%, –15% (LTC2915)

Manual Reset Input (LTC2916)

1.5V to 5.5V Supply Operation

6.2V Shunt Regulator for High Voltage Operation

Guaranteed Operation to 125˚C

Guaranteed Threshold Accuracy: ±1.5%

Low Quiescent Current: 30μA Typical

Power Supply Glitch Immunity

Guaranteed

RST

for V

CC

≥ 0.8V

Low Proﬁle (1mm) 8-Lead TSOT-23 (ThinSOT

TM

) and

(3mm

×

2mm) DFN Packages

APPLICATIONS

n

Handheld Devices

Cell Phone Base Stations

Automotive Control Systems

Network Servers

Optical Networking Systems

TYPICAL APPLICATION

1.8V, –5% Tolerance Supply Monitor

1.8V

0.1μF

V

CC

LTC2916

VM

RT

MR

GND

RST

SEL1

SEL2

t

RST

= 200ms

10k

V

CC

μP

RESET

29156 TA01

Monitor Selection Table

NOMINAL VOLTAGE

12V

5V

3.3V

2.5V

1.8V

1.5V

1.2V

1V

ADJ (0.5V)

SEL1

V

CC

V

CC

V

CC

Open

GND

SEL2

V

CC

Open

GND

V

CC

Open

GND

V

CC

Open

GND

29156fa

1

LTC2915/LTC2916

ABSOLUTE MAXIMUM RATINGS

(Notes 1, 2)

Terminal Voltages

V

CC

(Note 3).......................................... –0.3V to 5.7V

SEL1, SEL2, TOL,

MR, RST

.................. –0.3V to 7.5V

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

RT .............................................–0.3V to (V

CC

+ 0.3)V

Terminal Currents

V

CC

(Note 3).......................................................±5mA

Operating Temperature Range

LTC2915C/LTC2916C ............................... 0°C to 70°C

LTC2915I/LTC2916I.............................. –40°C to 85°C

LTC2915H/LTC2916H ......................... –40°C to 125°C

Storage Temperature Range................... –65°C to 150°C

TS8 Lead Temperature (Soldering, 10 sec) ........... 300°C

PIN CONFIGURATION

TOP VIEW

VM 1

SEL1 2

TOL/MR 3

GND 4

8 V

CC

7 SEL2

6 RT

5

RST

GND 1

TOL/MR 2

SEL1 3

VM 4

9

8

7

6

5

RST

RT

SEL2

V

CC

TS8 PACKAGE

8-LEAD PLASTIC TSOT-23

TOL FOR LTC2915

MR

FOR LTC2916

T

JMAX

= 150°C,

θ

JA

= 250°C/W

DDB PACKAGE

8-LEAD (3mm 2mm) PLASTIC DFN

TOL FOR LTC2915

MR

FOR LTC2916

T

JMAX

= 150°C,

θ

JA

= 76°C/W

EXPOSED PAD (PIN 9) PCB GND CONNECTION OPTIONAL

ORDER INFORMATION

LEAD FREE FINISH

LTC2915CTS8-1#PBF

LTC2915ITS8-1#PBF

LTC2915HTS8-1#PBF

LTC2915CDDB-1#PBF

LTC2915IDDB-1#PBF

LTC2915HDDB-1#PBF

LEAD FREE FINISH

LTC2916CTS8-1#PBF

LTC2916ITS8-1#PBF

LTC2916HTS8-1#PBF

LTC2916CDDB-1#PBF

LTC2916IDDB-1#PBF

LTC2916HDDB-1#PBF

TAPE AND REEL

LTC2915CTS8-1#TRPBF

LTC2915ITS8-1#TRPBF

LTC2915HTS8-1#TRPBF

LTC2915CDDB-1#TRPBF

LTC2915IDDB-1#TRPBF

LTC2915HDDB-1#TRPBF

TAPE AND REEL

LTC2916CTS8-1#TRPBF

LTC2916ITS8-1#TRPBF

LTC2916HTS8-1#TRPBF

LTC2916CDDB-1#TRPBF

LTC2916IDDB-1#TRPBF

LTC2916HDDB-1#TRPBF

PART MARKING*

LTCVQ

LCVR

PART MARKING*

LTDCW

LDCX

PACKAGE DESCRIPTION

8-Lead TSOT-23

8-Lead (3mm

×

2mm) Plastic DFN

8-Lead (3mm

×

2mm) Plastic DFN

8-Lead (3mm

×

2mm) Plastic DFN

PACKAGE DESCRIPTION

8-Lead TSOT-23

8-Lead (3mm

×

2mm) Plastic DFN

8-Lead (3mm

×

2mm) Plastic DFN

8-Lead (3mm

×

2mm) Plastic DFN

TEMPERATURE RANGE

0°C to 70°C

–40°C to 85°C

–40°C to 125°C

0°C to 70°C

–40°C to 85°C

–40°C to 125°C

TEMPERATURE RANGE

0°C to 70°C

–40°C to 85°C

–40°C to 125°C

0°C to 70°C

–40°C to 85°C

–40°C to 125°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/

29156fa

2

LTC2915/LTC2916

ELECTRICAL CHARACTERISTICS

SYMBOL

V

CC(MIN)

V

CC(UVLO)

V

CC(SHUNT)

I

CC

PARAMETER

Supply Undervoltage Lockout

Shunt Regulation Voltage

V

CC

Pin Current

I

VCC

= 0.5mA

SEL1, SEL2, TOL,

MR

= Open

SEL1, SEL2, TOL = GND (LTC2915)

MR

= V

CC

(LTC2916)

The

l

denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at T

A

= 25°C. V

CC

= 2.5V, unless otherwise noted. (Note 2)

CONDITIONS

l

MIN

0.8

TYP

MAX

1.5

UNITS

V

μA

Supply Voltage for Guaranteed

RST

Low

RST

Driven Low

5.7

6.2

30

45

7.0

50

80

Monitor Input (VM)

V

MT120

12V, 5% Reset Threshold

12V, 10% Reset Threshold

12V, 15% Reset Threshold

5V, 5% Reset Threshold

5V, 10% Reset Threshold

5V, 15% Reset Threshold

3.3V, 5% Reset Threshold

3.3V, 10% Reset Threshold

3.3V, 15% Reset Threshold

2.5V, 5% Reset Threshold

2.5V, 10% Reset Threshold

2.5V, 15% Reset Threshold

1.8V, 5% Reset Threshold

1.8V, 10% Reset Threshold

1.8V, 15% Reset Threshold

1.5V, 5% Reset Threshold

1.5V, 10% Reset Threshold

1.5V, 15% Reset Threshold

1.2V, 5% Reset Threshold

1.2V, 10% Reset Threshold

1.2V, 15% Reset Threshold

1V, 5% Reset Threshold

1V, 10% Reset Threshold

1V, 15% Reset Threshold

ADJ (0.5V), 5% Reset Threshold

ADJ (0.5V), 10% Reset Threshold

ADJ (0.5V), 15% Reset Threshold

VM Input Impedance (Note 4)

ADJ Input Current

Low Level Input Voltage

High Level Input Voltage

Pin Voltage when Open

Allowable Leakage in Open State

Pin Input Current

V

TPIN

= 0V, V

CC

I

TPIN

= 0μA

l

11.04

10.44

9.84

4.600

4.350

4.100

3.036

2.871

2.706

2.300

2.175

2.050

1.656

1.566

1.476

1.380

1.305

1.230

1.104

1.044

0.984

0.920

0.870

0.820

460.0

435.0

410.0

0.5

11.22

10.62

10.02

4.675

4.425

4.175

3.086

2.921

2.756

2.338

2.213

2.088

1.683

1.593

1.503

1.403

1.328

1.253

1.122

1.062

1.002

0.935

0.885

0.835

467.5

442.5

417.5

11.40

10.80

10.20

4.750

4.500

4.250

3.135

2.970

2.805

2.375

2.250

2.125

1.710

1.620

1.530

1.425

1.350

1.275

1.140

1.080

1.020

0.950

0.900

0.850

475.0

450.0

425.0

8

±15

0.5

V

mV

MΩ

nA

V

MT50

V

MT33

V

MT25

V

MT18

V

MT15

V

MT12

V

MT10

V

MTADJ

R

VM

I

VM(ADJ)

V

TPIN,LOW

V

TPIN,HIGH

V

TPIN,Z

I

TPIN,Z

I

TPIN,H/L

Fixed Threshold Modes

VM = 0.5V

l

Three-State Inputs (SEL1, SEL2), (TOL, LTC2915)

1.4

0.9

±5

±20

μA

29156fa

3

LTC2915/LTC2916

ELECTRICAL CHARACTERISTICS

SYMBOL

I

RT(UP)

I

RT(DOWN)

I

RT(INT)

V

RT(INT,LH)

Reset Output (RST)

t

RST(INT)

t

RST(EXT)

t

UV

V

OL

Internal Reset Timeout Period

Adjustable Reset Timeout Period

VM Undervoltage Detect to

RST

Asserted

Output Voltage Low

RST

V

RT

= V

CC

C

RT

= 2.2nF

VM Less Than Reset Threshold

V

MTX

by More Than 5%

V

CC

= 3.3V, I

RST

= 2.5mA

V

CC

= 1V, I

RST

= 100μA

V

CC

= 0.8V, I

RST

= 15μA

RST

= V

CC

l

The

l

denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at T

A

= 25°C. V

CC

= 2.5V, unless otherwise noted. (Note 2)

PARAMETER

RT Pull-Up Current

RT Pull-Down Current

Internal RT V

CC

Detect Current

RT Internal Timer Threshold

CONDITIONS

V

RT

= 0.25V

V

RT

= 1.1V

V

RT

= V

CC

V

RT

Rising, Referenced to V

CC

l

MIN

–2

2

–100

150

16

10

TYP

–3

3

1

–160

200

20

80

0.15

0.05

MAX

–4

4

8

–300

260

25

150

0.4

0.3

0.2

±1

0.2 • V

CC

UNITS

μA

mV

ms

μs

V

μA

V

kΩ

ns

Reset Timer Control (RT)

I

OH(RST)

V

IL

V

IH

R

PU

t

PW

RST

Output Voltage High Leakage

Input Low Voltage

Input High Voltage

Pull Up Resistance

Pulsewidth

Manual Reset Input (LTC2916)

l

0.8 • V

CC

50

250

100

150

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:

All currents into pins are positive; all voltages are referenced to

GND unless otherwise noted.

Note 3:

V

CC

maximum pin voltage is limited by input current. Since the

V

CC

pin has an internal 6.2V shunt regulator, a low impedance supply

which exceeds 5.7V may exceed the rated terminal current. Operation

from higher voltage supplies requires a series dropping resistor. See

Applications Information.

Note 4:

Input impedance is dependent on the conﬁguration of the SEL

pins.

TIMING DIAGRAM

Monitor Input Timing

VM

V

MTx

t

UV

RST

1V

29156 TD01

t

RST

29156fa

4

LTC2915/LTC2916

TYPICAL PERFORMANCE CHARACTERISTICS

Threshold Voltage vs

Temperature

1.5

QUIESCENT SUPPLY CURRENT, I

CC

(μA)

1.0

NORMALIZED V

MTnn

(%)

0.5

0

–0.5

–1.0

–1.5

–50 –25

V

MT25

V

MT120

40

T

A

= 25°C unless otherwise noted.

Allowable Glitch Duration vs

Magnitude

MAXIMUM ALLOWABLE GLITCH DURATION (μs)

300

250

200

150

100

50

0

1

10

100

0.1

GLITCH PERCENTAGE PAST THRESHOLD (%)

29156 G03

Quiescent Supply Current vs

Temperature

SEL1 = 0V

SEL2 = 2.5V

TOL = OPEN

V

CC

= 5.5V

30

V

CC

= 2.5V

V

CC

= 1.5V

25

35

V

MTADJ

RESET OCCURS

ABOVE CURVE

50

25

75

0

TEMPERATURE (°C)

100

125

20

–50

–25

75

0

25

50

TEMPERATURE (°C)

100

125

29156 G01

29156 G02

Internal Reset Timeout Period vs

Temperature

RESET TIMEOUT PERIOD (ms), t

RST(INT)

RT = V

CC

SHUNT REGULATION VOLTAGE, V

CC(SHUNT)

(V)

250

6.4

Shunt Regulation Voltage vs

Temperature

I

CC

= 5mA

SHUNT REGULATION VOLTAGE, V

CC(SHUNT)

(V)

7.0

Shunt Regulation Voltage vs

Supply Current

230

6.8

6.3

I

CC

= 1mA

210

6.6

190

6.2

I

CC

= 100μA

6.4

170

6.2

150

–50

–25

50

25

0

75

TEMPERATURE (°C)

100

125

6.1

–50

–25

0

25

50

75

TEMPERATURE (°C)

100

125

6.0

0.01

1

0.1

10

SUPPLY CURRENT, I

CC

(mA)

100

29156 G06

29156 G04

29156 G05

RST

Output Voltage vs V

CC

6

PULL-DOWN CURRENT, I

RST

(mA)

100k PULL-UP TO V

CC

SEL1 = SEL2 = TOL = 0V

5 V

M

= 0.5V

RST

VOLTAGE (V)

4

3

2

1

0

1

2

3

4

SUPPLY VOLTAGE, V

CC

(V)

5

29156 G07

RST

Pull-Down Current vs V

CC

6

5

4

RST

AT 150mV

3

2

1

0

1

2

3

4

SUPPLY VOLTAGE, V

CC

(V)

5

29156 G08

RST

V

OL

vs I

RST

1.0

NO PULL-UP R

V

CC

= 2.5V

0.8

RST

VOLTAGE (V)

T

A

= 125°C

0.6

T

A

= 25°C

0.4

RST

AT 50mV

0.2

T

A

= –40°C

0

2

6

4

I

RST

(mA)

8

10

29156 G09

29156fa

5

LTC2915CTS8-1-PBF

LTC2915CTS8-1-PBF概述

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