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ADP3604 데이터시트(PDF) 5 Page - Analog Devices

부품명 ADP3604
상세설명  Switched Capacitor Voltage Converter with Regulated Output
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ADP3604 데이터시트(HTML) 5 Page - Analog Devices

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ADP3604
REV. 0
–5–
TEMPERATURE –
°C
10
1.0
0.01
–50
100
050
0.1
ALUMINUM
CERAMIC
ORGANIC SEMIC
TANTALUM
ALUMINUM
CERAMIC
ORGANIC SEMIC
TANTALUM
Figure 16. ESR vs. Temperature
Table I. Alternative Capacitor Technologies
High
Type
Life
Freq
Temp
Size
Cost
Aluminum
Fair
Fair
Fair
Small
Low
Electrolytic
Capacitor
Multilayer
Long
Good
Poor
Fair
High
Ceramic
Capacitor
Solid
Above
Avg
Avg
Avg
Avg
Tantalum
Avg
Capacitor
OS-CON
Above
Good
Good
Good
Avg
Capacitor
Avg
The following is a partial list of manufacturers providing low
ESR capacitors.
Table II. Recommended Capacitor Manufacturers
Manufacturer
Capacitor
Capacitor Type
Sprague
672D, 673D,
Aluminum Electrolytic
674D, 678D
Sprague
675D, 173D,
Tantalum
199D
Nichicon
PF & PL
Aluminum Electrolytic
Mallory
TDC & TDL
Tantalum
TOKIN
MLCC
Multilayer Ceramic
muRata
GRM
Multilayer Ceramic
EXTERNAL OUTPUT FILTERING
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:
VRIPPLE =
IOUT
2(FPUMP )(C2)
+ I
OUT ( ESRC2 )
In Figure 15, output ripple voltage vs. capacitance and various
ESR are shown.
CAPACITANCE – µF
120
0
0
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 VOUT 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. There is a voltage drop across CP’s ESR during the charge
as well as during discharges. Therefore, the voltage drop due to
C2 is about 4 times C2’s ESR times the load current. The volt-
age drop generated by C2’s ESR combined with the voltage
drop due to the output source resistance, determines the maxi-
mum available VOUT, 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. The 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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