LTC2901 datasheet(3/16 Pages) LINER

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LTC2901

2901fb

The

● denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25

°C. VCC = 5V, unless otherwise noted. (Notes 3, 4)

ELECTRICAL CHARACTERISTICS

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: The greater of V1, V2 is the internal supply voltage (VCC).

Note 4: 10% thresholds apply to the LTC2901-3/LTC2901-4 only when the

TOL pin is set to a logic high.

Note 5: Under static no-fault conditions, V1 will necessarily supply quiescent

current. If at any time V2 is larger than V1, V2 must be capable of supplying

the quiescent current, programming (transient) current and reference load

current.

Note 6: The output pins RST, WDO and COMPX have internal pull-ups to V2

of typically 6

μA. However, external pull-up resistors may be used when faster

rise times are required or for VOH voltages greater than V2.

Note 7: The push-pull RST output pin on the LTC2901-2/LTC2901-4 is

actively pulled up to V2.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VCCMINP

Minimum Required for Programming

VCC Rising

●

2.42

VCCMINC

Minimum Required for Comparators

VCC Falling

●

2.32

VREF

Reference Voltage

VCC ≥ 2.3V, IVREF = ±1mA, CREF ≤ 1000pF

T0L Low

●

1.192

1.210

1.228

T0L High

●

1.128

1.146

1.163

VPG

Programming Voltage Range

VCC ≥ VCCMINP

●

0VREF

IVPG

VPG Input Current

VPG = VREF

●

±20

IV1

V1 Input Current

V1 = 5V, IVREF = 12μA, (Note 5)

●

μA

IV2

V2 Input Current

V2 = 3.3V

●

0.8

μA

IV3

V3 Input Current

V3 = 2.5V

●

0.52

1.2

μA

V3 = 0.55V (ADJ Mode)

●

–15

IV4

V4 Input Current

V4 = 1.8V

●

0.34

0.8

μA

V4 = 0.55V (ADJ Mode)

●

–15

V4 = –0.05V (–ADJ Mode)

●

–15

ICRT(UP)

CRT Pull-Up Current

VCRT = 0V

●

–1.4

–2

–2.6

μA

ICRT(DN)

CRT Pull-Down Current

VCRT = 1.3V

●

μA

tRST

Reset Time-Out Period

CRT = 1500pF

●

579

tUV

VX Undervoltage Detect to RST or COMPX

VX Less Than Reset Threshold VRTX

150

μs

by More Than 1%

VOL

Output Voltage Low RST, COMPX

ISINK = 2.5mA; V1 = 3V, V2 = 3V;

●

0.15

0.4

V3, V4 = 0V; VPG = 0V

ISINK = 100μA; V2 = 1V; V1, V3, V4 = 0V

●

0.05

0.3

ISINK = 100μA; V1 = 1V; V2, V3, V4 = 0V

●

0.05

0.3

VOH

Output Voltage High RST, WDO, COMPX

ISOURCE = 1μA

●

V2 – 1

(Note 6)

VOL

Output Voltage Low WDO

ISINK = 2.5mA; V1 = 5V, V2 = 3.3V;

●

0.15

0.4

V3, V4 = 1V; VPG = 0V

VOH

Output Voltage High RST

ISOURCE = 200μA

●

0.8 • V2

(LTC2901-2/LTC2901-4) (Note 7)

ICWT(UP)

CWT Pull-Up Current

VCWT = 0V

●

–1.4

–2

–2.6

μA

ICWT(DN)

CWT Pull-Down Current

VCWT = 1.3V

●

μA

tWD

Watchdog Time-Out Period

CWT = 1500pF

●

VIH

WDI Input Threshold High

VCC = 3.3V to 5.5V

●

1.6

VIL

WDI Input Threshold Low

VCC = 3.3V to 5.5V

●

0.4

tWP

WDI Input Pulse Width

VCC = 3.3V

●

150

IWDI

WDI Pull-Up Current

VWDI = 0V

–10

μA

Digital Input T0L

VIL

T0L Low Level Input Voltage

VCC = 3.3V to 5.5V

●

0.3VCC

VIH

T0L High Level Input Voltage

VCC = 3.3V to 5.5V

●

0.7VCC

IINTOL

T0L Input Current

TOL = VCC

●

±0.1

±1

μA

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