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参数资料
| 型号： | LTC2914HDHC-1 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封装： | 5 X 3 MM, PLASTIC, MO-229WJED-1, DFN-16 |
| 文件页数： | 3/16页 |
| 文件大小： | 211K |
| 代理商： | LTC2914HDHC-1 |
LTC2914
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UV/OV Timing
The LTC2914 has an adjustable timeout period (tUOTO) that
holds OV or UV asserted after all faults have cleared. This
assures a minimum reset pulse width allowing a settling
time delay for the monitored voltage after it has entered
the valid region of operation.
When any VH input drops below its designed threshold,
the UV pin asserts low. When all inputs recover above
their designed thresholds, the UV output timer starts. If
all inputs remain above their designed thresholds when
the timer nishes, the UV pin weakly pulls high. However,
if any input falls below its designed threshold during this
time-out period, the timer resets and restarts when all inputs
are above the designed thresholds. The OV output behaves
as the UV output when LATCH is high (LTC2914-1).
Selecting the UV/OV Timing Capacitor
The UV and OV timeout period (tUOTO) for the LTC2914
is adjustable to accommodate a variety of applications.
Connecting a capacitor, CTMR, between the TMR pin and
ground sets the timeout period. The value of capacitor
needed for a particular timeout period is:
CTMR = tUOTO 115 10–9 (F/s)
The Reset Timeout Period vs Capacitance graph found in
the Typical Performance Characteristics shows the desired
delay time as a function of the value of the timer capacitor
that must be used. The TMR pin must have a minimum of
10pF or be tied to VCC. For long timeout periods, the only
limitation is the availability of a large value capacitor with
low leakage. Capacitor leakage current must not exceed
the minimum TMR charging current of 1.3μA. Tying the
TMR pin to VCC bypasses the timeout period.
Undervoltage Lockout
When VCC falls below 2V, the LTC2914 asserts an
undervoltage lockout (UVLO) condition. During UVLO,
UV is asserted and pulled low while OV is cleared and
blocked from asserting. When VCC rises above 2V, UV
follows the same timing procedure as an undervoltage
condition on any input.
Shunt Regulator
The LTC2914 has an internal shunt regulator. The VCC pin
operates as a direct supply input for voltages up to 6V.
Under this condition, the quiescent current of the device
remains below a maximum of 100μA. For VCC voltages
higher than 6V, the device operates as a shunt regulator
and must have a resistance RZ between the supply and the
VCC pin to limit the current to no greater than 10mA.
When choosing this resistance value, choose an appropriate
location on the I-V curve shown in the Typical Performance
Characteristics section to accommodate variations in VCC
due to changes in current through RZ.
UV and OV Output Characteristics
The DC characteristics of the UV and OV pull-up and
pull-down strength are shown in the Typical Performance
Characteristics section. Each pin has a weak internal pull-up
to VCC and a strong pull-down to ground. This arrangement
allows these pins to have open-drain behavior while pos-
sessing several other benecial characteristics. The weak
pull-up eliminates the need for an external pull-up resistor
when the rise time on the pin is not critical. On the other
hand, the open-drain conguration allows for wired-OR
connections and is useful when more than one signal
needs to pull down on the output. VCC of 1V guarantees
a maximum VOL = 0.15V at UV.
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