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

IDONE(DN)

DONE Pull-Down Current

VDONE = 3.3V (Note 6)

l

20

40

µA

RDONE

Required Pull-Up Resistance on “Last” 5% Tolerance or Better

LTC2928

l 2.4

5.1

kΩ

VDONE(LAST)

Voltage Output High when Configured

as “Last”

l 0.8 • VCC

V

Reset Pin: RST

VRST(OL)

RST Voltage Output Low

VRST(OH)

RST Voltage Output High

Timer Pins: RTMR, PTMR, STMR

VCC = 0.2V, IRST = 0.1µA

VCC = 0.5V, IRST = 5µA

VCC = 1V, IRST = 200µA

VCC = 3V, IRST = 2500µA

IRST = –1µA (Note 7)

l

5

60

mV

l

10

150

mV

l

25

300

mV

l

150

300

mV

l VCC – 1

V

ITMR(UP)

Timer Pull-Up Current

VTMR = GND

l –1.7

–2

–2.3

µA

ITMR(DN)

Timer Pull-Down Current

tRTMR

tPTMR

tSTMR

Timer Period, RTMR (Note 8)

Timer Period, PTMR

Timer Period, STMR

External Voltage Reference Pin: REF

VTMR = 1.3V

CRTMR = 1500pF

CPTMR = 1500pF

CSTMR = 1500pF

l

15

20

25

µA

l

5

6

7

ms

l

5

6

7

ms

l

11

13

15

ms

VREF

Reference Voltage Output

100% Sequence Threshold

67% Sequence Threshold

33% Sequence Threshold

10% Sequence Threshold

Over Voltage Indication Pin: OV

IREF = 0.2mA, –1mA, CREF = ≤ 1000pF l 1.172 1.189 1.205

V

VSEL = VCC

l 1.172 1.189 1.205

V

VSEL = VCC

l 0.780 0.793 0.806

V

VSEL = VCC

l 0.386 0.396 0.406

V

VSEL = VCC

l 0.109 0.119 0.129

V

VOV(OL)

OV Voltage Output Low

IOV = 2.5mA

l

0.15

0.3

V

VOV(OH)

tOV

OV Voltage Output High (Note 7)

OV Indication Time (Note 8)

Over Voltage Adjust Pin: OVA

IOV = –1mA

OV Low Time Upon Cleared

OV Event, CRTMR = 1500pF

l VCC – 1

V

l

5

6

7

ms

VOVA(TH)

Over Voltage Threshold at Comparator

Inputs (Note 9)

VOVA = GND

VOVA Floating

VOVA = VCC = 3.3V

l 0.546 0.556 0.566

V

l 0.650 0.660 0.670

V

l 1.042 1.072 1.102

V

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: Internal circuits regulate the EN output voltage to VEN. Driving this

pin to voltages beyond VEN may damage the part.

Note 4: The comparator outputs have internal pull-ups to VCC of typically

–10µA. However, external pull-up resistors may be used when faster rise

times are required or for VOH voltages greater than VCC.

Note 5: The CAS high time after an ON edge is stretched by the ON pin

propagation delay (20µs typical).

Note 6: The DONE pull-down current is present when DONE is high to

facilitate cascading multiple LTC2928s.

Note 7: The RST and OV outputs have an internal pull-up to VCC of

typically –10µA. However, external pull-up resistors may be used when

faster rise times are required or for VOH voltages greater than VCC.

Note 8: If the termination of under and overvoltage events occur within

one nominal tRTMR period, the variation in tRTMR and/or tOV may be ±15%.

Note 9: Use a resistor from OVA to ground or VCC to configure overvoltage

thresholds within the max/min ranges shown. See Applications

Information for details.

For more information www.linear.com/LTC2928

2928fa

5

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