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SP4446 数据表(PDF) 5 Page - Sipex Corporation

部件名 SP4446
功能描述  High Output Voltage Boost Regulator LCD Bias Regulator
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制造商  SIPEX [Sipex Corporation]
网页  http://www.sipex.com
标志 SIPEX - Sipex Corporation

SP4446 数据表(HTML) 5 Page - Sipex Corporation

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5
Rev. 7/14/03
SP4446 High Output Voltage Boost Regualtor, LCD Bias Regulator
© Copyright 2003 Sipex Corporation
APPLICATION INFORMAMTION: Continued
The formula and table for the resistor selection
are shown below:
R1 =
(
VOUT
- 1
) • R2
1.22
Table 3. Divider Resistor Selection
VOUT (V)
R1 (
)R2 ()
12
1M
113K
15
1M
88.7K
18
1M
73.2K
20
1M
64.9K
30
1M
42.2K
Layout Consideration
Both the input capacitor and the output capacitor
should be placed as close as possible to the IC.
This can reduce the copper trace resistance which
directly effects the input and output ripples. The
feedback resistor network should be kept close to
the FB pin to minimize copper trace connections
that can inject noise into the system. The ground
connectionforthefeedbackresistornetworkshould
connect directly to the GND pin or to an analog
ground plane that is tied directly to the GND pin.
The inductor and the schottky diode should be
placed as close as possible to the switch pin to
minimize the noise coupling to the other circuits,
especially the feedback network.
3.3V or 5V
R1
1M
C1
4.7uF
30V
R2
42.2K
U1
SP4446
1
2
3
4
5
SHDN
Murata LQH32CN100K21
3 to 5 mA
DS
MBR0530
C2
47pF
1.22V
L1 10uH 0.3A
C3
2.2uF
3.3V or 5V
R1
1M
C1
4.7uF
30V
R2
42.2K
U1
SP4446
1
2
3
4
SW
GND
FB
SHDN
V
IN
Murata LQH32CN100K21
V
IN
3 to 5 mA
DS
MBR0530
V
OUT
C2
47pF
1.22V
L1 10uH 0.3A
C3
2.2uF
V
IN
DS
C1
4.7uF
Q1
MMBT2907A
R1
1M
R3
154K
20V
1.22V
C2
47pF
R2
64.9K
U1
SP4446
1
2
3
4
5
SW
GND
FB
SHDN
V
IN
V
OUT
L1
10uH
C3
2.2uF
Load Disconnect in Shutdown
When SP4446 was shut down, the load is still
connected to the input. In applications that re-
quire output isolation during shutdown, an ex-
ternalPNPtransistor(forexample MMBT2907A)
can be added as shown in Figure 20. When the
SP4446 is active, the voltage set at the emitter of
the transistor exceeds the input voltage, forcing
the transistor into the saturation region. When
the SP4446 is shut down, the input voltage
exceeds the emitter voltage, thus the transistor
becomes inactive and provides high-impedance
isolation between the input and load. Efficiency
will be slightly sacrificed because of the satura-
tion voltage and base current of the PNP transistor.
Fig. 20. Load Disconnect in Shutdown
PIN Diode Driver
The SP4446 can be used as PIN diode driver as
shown in Fig. 21. Two Resistors (R1=1MΩ,
R2=42.2KΩ) are used to program the output volt-
age to be 30V. When input voltage is 3.3V or 5V,
it can supply a maximum current of 3mA and 5mA
to the load.
Fig. 21. Pin Diode Driver


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