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參數(shù)資料
| 型號： | ILC7280AR3030X |
| 英文描述： | VOLT REGULATOR|FIXED|DUAL +3V|CMOS|TSSOP|8PIN|PLASTIC |
| 中文描述： | 電壓調(diào)節(jié)器|定額|雙3V的|的CMOS | TSSOP封裝| 8引腳|塑料 |
| 文件頁數(shù)： | 7/9頁 |
| 文件大?。?/td> | 377K |
| 代理商： | ILC7280AR3030X |
PRODUCT SPECIFICATION
ILC7280
REV. 1.0.5 6/3/02
7
Application Information
V
These pins are connected internally through a galvanic
connection. For maximum power from each regulator, both
V
INA
and V
INB
must be connected externally to V+.
IN
A and B
Enable/Shutdown
Forcing EN
enables the regulator(s). These inputs are CMOS logic
compatible gates. If this feature is not required, connect
EN
A
and/or EN
B
to V
IN
. Note that V
connected internally. To minimize the effect of imbalanced
current sharing and possible noise, both V
should also be connected externally.
A
and/or EN
B
to a voltage greater than 2V,
INA
and V
INB
are
INA
and V
INB
Input Capacitor
A 1μF capacitor should be placed from V
INA/B
to GND if
there is more than 10 inches of wire between the input and
the ac filter capacitor or if a battery is used as the input.
Reference Bypass Capacitor
C
NOISE
(the reference voltage bypass capacitor) may be
connected to the internal V
REF
which is common to regula-
tor’s A and B.
For low noise applications use of 1nF C
NOISE
is recom-
mended. Value higher than 1nF will lead to minimum
improvement of output noise, but it will substantially
increase the start-up time. Lower value of C
NOISE
results in
faster start –up. If a slow or delayed start up time is desired,
a larger value of C
NOISE
is used. Conversely, faster start up
times or instant-on applications will require smaller values
of C
NOISE
or its omission with the pin left open. The trade-
off of noise to response time should be considered.
Output Capacitor
An output capacitor is required from V
OUTA
and V
OUTB
to
GND to prevent oscillation and minimize the effect of load
transient currents. The minimum size of the output capaci-
tor(s) is dependent on the usage of C
NOISE
and its value.
Without C
NOISE
, a minimum of 0.47μF is recommended.
For C
NOISE
= 1nF, a minimum of 2.2μF is recommended.
Larger values of output capacitance will slightly slow the
regulator’s response during power up. The ILC7280 remains
stable even with ESR values as low as 10m
.
If the system design calls for smaller load currents, lower
capacitance may be used. Below 10mA the capacitance may
be reduced to 0.33μF.
No-load Stability
The ILC7280 will remain stable and in regulation with no
load current. These are desirable performance features for
applications such as keep-alive modes in CMOS systems.
Split-Supply Operation
When using the ILC7280 in a system requiring that the load
be returned to the negative voltage source, the output(s) must
be diode clamped to inhibit significant voltage excursions
below ground. A simple external diode clamp to ground will
protect the device from damage.
Thermal Considerations
In order to minimize thermal resistance (
θ
JA
), the device
mounted on conventional FR4 PCB material should be
surrounded as much ground copper ground plane as
possible. In a worst case application with minimum trace
widths and no ground plane, the MSOP-8 package exhibits a
thermal resistance of 200 °C/W. The maximum allowable
power dissipation is calculated in the following examples.
Thermal Evaluation Examples
The maximum allowed package power dissipation is:
P
D(max)
=(T
Jmax
–T
A
) /
θ
JA
, where T
Jmax
is the maximum
junction temperature and T
A
is the ambient temperature.
For an ambient temperature of 50°C
P
D(max)
= (150°C - 50°C) / 200°C/W
P
D(max)
= 500mW
If the intent is to operate from a 4V power source with a
150mA load current from both outputs at a 50°C ambient
temperature, the expected power dissipation is found in the
following calculation:
P
D
(each regulator) = (V
IN
– V
OUT
) * I
OUT
+ (V
IN
* I
GND
)
P
D
(each regulator) = (4V – 3V) * 150mA + (4V * 0.12mA)
P
D
(each regulator) = 150mW
P
D
(both regulators) = 2 * 150mW
P
D
(both regulators) = 300mW
In this example the total power dissipated is 300mW which
is below the 500mW maximum package consideration and
therefore safe to operate. It should be noted that it is not
always possible to operate both regulators at the maximum
output current.
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