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参数资料
| 型号： | LTC2910HDHC#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 8-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： | 520K |
| 代理商： | LTC2910HDHC#TR |
LTC2910
11
2910fc
the desired delay time as a function of the value of the
timer capacitor. 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 LTC2910 asserts an
undervoltage lockout (UVLO) condition. During UVLO, RST
is asserted and pulled low and RST is pulled high. When
VCC rises above 2V, RST and RST follow the same timing
procedure as an undervoltage condition on any input.
Shunt Regulator
The LTC2910 has an internal shunt regulator. The VCC pin
operates as a direct supply input for voltages up to 6V.
In this range, the quiescent current of the device remains
below a maximum of 100μA. For VCC voltages higher than
6V, the pin functions 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 selecting this resistance value, choose an appropriate
location on the I-V curve shown in the Typical Performance
Characteristics to accommodate any variations in VCC due
to changes in current through RZ.
RST/RST Output Characteristics
The DC characteristics of the RST and RST pull-up and
pull-down strength are shown in the Typical Performance
Characteristics. Each has a weak internal pull-up to VCC and
a strong pull-down to ground. This arrangement allows
each pin to have open-drain behavior while possessing
several other benecial characteristics. The weak pull-up
eliminates the need for an external pull-up resistor when
the rise time on this pin is not critical. On the other hand,
the open drain conguration allows for wired-OR connec-
tions and is useful when more than one signal needs to
pull down on the RST or RST lines. VCC of 1V guarantees
a maximum VOL = 0.15V.
At VCC = 1V, the weak pull-up current on RST is barely
turned on. Therefore, an external pull-up resistor of no more
than 100k is recommended on the RST pin if the state and
pull-up strength of the RST pin is crucial at very low VCC.
Note however, by adding an external pull-up resistor, the
pull-up strength on the RST pin is increased. Therefore,
if it is connected in a wired-OR connection, the pull-down
strength of any single device must accommodate this ad-
ditional pull-up strength.
Output Rise and Fall Time Estimation
The RST and RST outputs have strong pull-down capabil-
ity. The following formula estimates the output fall time
(90% to 10%) for a particular external load capacitance
(CLOAD):
tFALL ≈ 2.2 RPD CLOAD
where RPD is the on-resistance of the internal pull-down
transistor, typically 50Ω at VCC > 1V, and at room tem-
perature (25°C). CLOAD is the external load capacitance
on the pin. Assuming a 150pF load capacitance, the fall
time is 16.5ns.
The rise time on the RST and RST pins is limited by a
400k internal pull-up resistance to VCC. A similar formula
estimates the output rise time (10% to 90%) at the RST
and RST pins:
tRISE ≈ 2.2 RPU CLOAD
where RPU is the pull-up resistance.
Disable
The LTC2910 allows disabling the RST and RST outputs
via the DIS pin. Pulling DIS high forces both outputs to
remain unasserted, regardless of any faults that occur
on the inputs. However, if a UVLO condition occurs, RST
asserts and pulls low, RST asserts and pulls high, but the
timeout function is bypassed. RST pulls high and RST pulls
low as soon as the UVLO condition is cleared.
DIS has a weak 2μA (typical) internal pull-down current
guaranteeing normal operation with the pin left open.
APPLICATIONS INFORMATION
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| LTC2910IGN | 制造商:Linear Technology 功能描述:Volt Supervisor Monitor 1.2V/1.8V/2.5V/3.3V/5V/12V 16-Pin SSOP N |
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