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參數(shù)資料
| 型號： | TC1142-50EUA |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Inductorless -2x Boost/Buck Regulator |
| 中文描述： | 電感- 2x升壓/降壓穩(wěn)壓器 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 419K |
| 代理商： | TC1142-50EUA |
2002 Microchip Technology Inc.
DS21360B-page 7
TC1142
TABLE 3-2:
LOW ESR SURFACE-MOUNT
CAPACITOR
MANUFACTURERS
3.3
Power Efficiency
Assuming the output is loaded with at least 20% of the
maximum available output current, the power efficiency
of the TC1142 can be estimated using the following
equation:
EQUATION 3-5:
For example, a 3.2 Volt V
IN
, and a -5 Volt V
R
will have
an efficiency of approximately 78%. For loads less than
20% of the maximum available output current, the
power efficiency will be substantially reduced. Other
factors that affect the actual efficiency include:
1.
Losses from power consumed by the internal
oscillator (if used).
2.
I
2
R losses due to the on-resistance of the
MOSFET charge pump switches.
3.
Charge pump capacitor losses due to ESR.
4.
Losses that occur during charge transfer (from
the flying capacitors to the output capacitor)
when a voltage difference exists between these
capacitors.
3.4
Choice of -2x or -1x Connections
If required output voltage can be achieved using a -1x
configuration then this is preferred for the following
reasons:
1.
Power efficiency is improved from V
R
/2V
IN
to
V
R
/V
IN
2.
Only one flying capacitor needed
3.
The output ripple becomes proportional to
V
IN
–
V
R
rather than 2 V
IN
–
V
R
.
3.5
Layout Considerations
Proper layout is important to obtain optimal perfor-
mance. Mount capacitors as close to their connecting
device pins as possible to minimize stray inductance
and capacitance. It is recommended that a large
ground plane be used to reduce noise leakage into
other circuitry.
FIGURE 3-4:
TIMING DIAGRAM
Manufacturer
Type
Phone
AVX Corp.
TPS series surface-mount
tantalum
X7R type surface-mount
ceramic
267 series surface-mount
tantalum
X7R type surface-mount
ceramic
593D, 594D, 595D series
surface-mount tantalum
Ceramic chip capacitors
Ceramic chip capacitors
Ceramic chip capacitors
803-448-9411
Matsuo
714-969-2491
Sprague
207-324-4140
Murata
Taiyo Yuden
Tokin
800-831-9172
800-348-2496
408-432-8020
η
= |V
R
|
2(V
IN
)
CCLK
V
OUT
–
V
R
Internal
Oscillator
Shutdown
External
Clock
Shutdown
t
0
= counter timeout (~160
μ
sec)
t
0
V
IL
GND
V
IH
t
0
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