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

Pin Functions

STMR: Sequence Timer. Attach an external capacitor to

ground to set the adjacent time-position delay between

sequenced supplies. For supplies in adjacent time positions,

this delay resides between the previous supply crossing

its sequence-up (down) threshold and the next enable

(EN) pulling high (low). For a supply in time position 1,

the sequence delay is the time from ON going high to

its enable pulling high. The sequence timing scale fac-

tor is 8670ms/µF. Floating STMR generates a minimum

sequencing time delay of approximately 100µs. A 3300pF

capacitor will generate a 29ms delay time. Referring to the

timing diagrams, the sequence delay time is equivalent

to the cascade (CAS) pin high time. Consult Applications

Information for details.

VCC: Power Supply Input/Output. All internal circuits are

powered from VCC. Bypass VCC with at least 0.1µF to

ground in close proximity to this pin (1µF minimum when

using HVCC).

VSEL: Voltage Monitor Select Input. Tie to ground to

select four positive inputs. Tie to VCC for three positive

and one negative adjustable input. Negative supplies are

monitored on the V1 input. See Applications Information

for configuration table.

V1-V4: Voltage Monitor Inputs. Connect these high imped-

ance inputs to external resistive dividers between each

monitored power supply and ground (or REF for negative

supplies monitored on V1). See Applications Information

for selecting resistors to configure the monitor thresholds.

Voltage monitor inputs operate with their respective RT

inputs and EN outputs. OV comparators are always active.

Tie unused monitor inputs to GND.

For more information www.linear.com/LTC2928

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