LTC2928I データシートの表示（PDF） - Linear Technology

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LTC2928I

Multichannel Power Supply Sequencer and Supervisor

Linear Technology 

LTC2928

Electrical Characteristics The l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C, VCC = 3.3V unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Supply Enable Pins: EN1, EN2, EN3, EN4

VEN

Enable Pin Voltage Output in On State IEN = –1µA

l VCC + 4.5 VCC + VCC + 6

V

5.5

IEN(UP)

Enable Pin Pull-Up Current

VEN(OL)

Enable Pin Voltage Output Low

Comparator Outputs: CMP1, CMP2, CMP3, CMP4

Enable Pin On, VEN ≤ (VCC + 4V)

l –7.5

–10

–12.5

µA

IEN = 2.5mA

l

0.25

0.4

V

VCMP(OL)

VCMP(OH)

Comparator Voltage Output Low

Comparator Voltage Output High

(Note 4)

ICMP = 2.5mA

ICMP = –1µA

l

0.15

0.3

V

l VCC – 1

V

Three-State Selection Inputs: SQT1, SQT2, MS1, MS2, RDIS

VIL

Voltage Input Low Threshold

VIH

Voltage Input High Threshold

IHZ

High Z Pin Current

Positive/Negative Selection Input: VSEL

VHZ = 0.7V

VHZ = 1.1V

l

l 1.4

l –10

l

10

0.4

V

V

µA

µA

VIL

Voltage Input Low Threshold

VIH

Voltage Input High Threshold

Sequence Time Position Control Inputs: RT1, RT2, RT3, RT4 (see resistor selection Table 3)

l

l 1.4

0.4

V

V

VRT(LO)

Voltage Required to Force Enable Pin

Low While Sequencing

l

0.045 • VCC

V

VRT(HI)

Voltage Required to Force Enable Pin

High Outside of Sequencing

l 0.955 • VCC

V

RRT

RT Pin Input Resistance

Cascade Pin: CAS

l 11.2

12

12.8

kΩ

VCAS(OL)

ICAS(UP)

tCAS(HI)

CAS Voltage Output Low

ICAS = 2.5mA

l

0.15

0.3

V

CAS Pull-Up Current

Master Pulling CAS High, VCAS = GND l –45

–60

–75

µA

Fixed Time Delay between Sequence

Time Positions (Note 5)

CAS High, CSTMR = 1500pF

l

11

13

15

ms

tCAS(MIN)

Minimum CAS Low Time During

Sequencing

l

15

22.5

30

µs

Fault Status Pin: FLT

VFLT(OL)

IFLT(UP)

VFLT(TH)

VFLT(HYST)

tFLT

FLT Voltage Output Low

FLT Pull-Up Current

External Fault Input Threshold

External Fault Input Hysteresis

Minimum Detectable External Fault

Pulse Width

IFLT = 2.5mA

VFLT = VCC –1V

VFLT Falling

l

0.15

0.3

V

l –12

–17

–22

µA

l 1.0

1.1

1.2

V

l

25

100

150

mV

2

µs

IFLT(LKG)

Fault Pin Leakage Current

Done Status Pin: DONE

VFLT = VCC

l

±1

µA

VDONE(OL)

DONE Voltage Output Low

IDONE = 2.5mA

l

0.15

0.3

V

2928fa

4

For more information www.linear.com/LTC2928

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