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| 型號(hào)： | ADP3604 |
| 廠商： | Analog Devices, Inc. |
| 中文描述： | 開(kāi)關(guān)電容電壓轉(zhuǎn)換器，具有穩(wěn)壓輸出 |
| 文件頁(yè)數(shù)： | 5/8頁(yè) |
| 文件大小： | 143K |
| 代理商： | ADP3604 |
ADP3604
REV. 0
–5–
TEMPERATURE –
°
C
E
10
1.0
0.01
–50
100
0
50
0.1
ALUMINUM
CERAMIC
ORGANIC SEMIC
TANTALUM
ALUMINUM
CERAMIC
ORGANIC SEMIC
TANTALUM
Figure 16. ESR vs. Temperature
T able I. Alternative Capacitor T echnologies
High
Freq
T ype
Life
T emp
Size
Cost
Aluminum
Electrolytic
Capacitor
Multilayer
Ceramic
Capacitor
Solid
T antalum
Capacitor
OS-CON
Capacitor
Fair Fair
Fair
Small
Low
Long
Good
Poor
Fair
High
Above
Avg
Avg
Avg
Avg
Avg
Above
Avg
Good
Good
Good
Avg
T he following is a partial list of manufacturers providing low
ESR capacitors.
T able II. Recommended Capacitor Manufacturers
Manufacturer
Capacitor
Capacitor T ype
Sprague
672D, 673D,
674D, 678D
675D, 173D,
199D
PF & PL
T DC & T DL
MLCC
GRM
Aluminum Electrolytic
Sprague
T antalum
Nichicon
Mallory
T OK IN
muRata
Aluminum Electrolytic
T antalum
Multilayer Ceramic
Multilayer Ceramic
E X T E RNAL OUT PUT FILT E RING
In applications requiring very low power supply ripple and
noise, the circuit in Figure 18 provides low noise and ripple of
less than 2% of the output voltage over the full load current and
temperature.
Since output current is supplied solely by the output capacitor
C3 during one-half of the charge-pump cycle, peak-to-peak
output ripple voltage is calculated by using the following
formula:
V
RIPPLE
=
I
OUT
2(
F
PUMP
)(
C
2)
+
I
OUT
(
ESR
C
2
)
In Figure 15, output ripple voltage vs. capacitance and various
ESR are shown.
CAPACITANCE – μF
O
120
00
180
20
40
60
80
100
120
140
160
100
80
60
40
20
ESR
C
140mA
V
OUT
ADP3604
150m
100m
50m
Figure 15. Output Ripple Voltage (mV) vs. Capacitance
and ESR
Note that as the capacitor value increases beyond the point
where the dominant contribution to the output ripple is due to
the ESR, no significant reduction in V
OUT
ripple is achieved by
added capacitance.
A low ESR capacitor has much greater impact on performance
for C2 than C3 since current through C2 is twice the C3 cur-
rent. T here is a voltage drop across C
P
’s ESR during the charge
as well as during discharges. T herefore, the voltage drop due to
C2 is about 4 times C2’s ESR times the load current. T he volt-
age drop generated by C2’s ESR combined with the voltage
drop due to the output source resistance, determines the maxi-
mum available V
OUT
, while C3’s ESR affects the output voltage
ripple.
When selecting the capacitors, keep in mind that not all manu-
facturers guarantee capacitor ESR in the range required by the
circuit. In general, the capacitor’s ESR is inversely proportional
to its physical size, so larger capacitance values and higher volt-
age ratings tend to reduce ESR.
ESR is also a function of the operating frequency. When select-
ing a capacitor, make sure its value is rated at the circuit’s oper-
ating frequency. T he other factor affecting the capacitor’s
performance is temperature. If the circuit has to operate at tem-
peratures significantly different than 25
°
C, the capacitance and
ESR values must be carefully selected to adequately compen-
sate for the change. Various capacitor technologies offer im-
proved performance over temperature, for example, certain
tantalum capacitors provide good low-temperature ESR but at
a higher cost.
Figure 16 demonstrates the effect temperature has on various
capacitors. ADP3604’s high internal oscillator frequency per-
mits the usage of smaller capacitance for both the pump and
the output capacitors.
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PDF描述 |
|---|---|
| ADP3604AR | Secondary Over-Voltage Protection for 2-4 cell in series Li-Ion/Poly (4.45V) 8-SM8 -40 to 110 |
| ADP3604* | Dual/Quad Rail-to-Rail Output, Picoamp Input Precision Op Amps; Package: SO; No of Pins: 8; Temperature Range: -40°C to +85°C |
| ADP3605ARU-3 | 120 mA Switched Capacitor Voltage Inverter with Regulated Output |
| ADP3605AR-3 | 120 mA Switched Capacitor Voltage Inverter with Regulated Output |
| ADP3605AR | Secondary Over-Voltage Protection for 2-4 cell in series Li-Ion/Poly (4.45V) 8-SM8 -40 to 110 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADP3604AR | 制造商:Rochester Electronics LLC 功能描述:SW CAPACITOR VOLT CONV W/REG OUTPUT - Bulk |
| ADP3604AR-REEL | 制造商:Analog Devices 功能描述: |
| ADP3605 | 制造商:AD 制造商全稱:Analog Devices 功能描述:120 mA Switched Capacitor Voltage Inverter with Regulated Output |
| ADP36050001RUR | 制造商:Analog Devices 功能描述: |
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