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BD3507HFV 데이터시트(PDF) 8 Page - Rohm

부품명 BD3507HFV
상세설명  Nch FET Ultra LDO for PC Chipsets
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제조업체  ROHM [Rohm]
홈페이지  http://www.rohm.com
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BD3507HFV 데이터시트(HTML) 8 Page - Rohm

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Technical Note
8/15
BD3507HFV
www.rohm.com
2010.05 - Rev.A
© 2010 ROHM Co., Ltd. All rights reserved.
Application setting method
Part No
Value
Notes for Use
R1/R2
22k/11k
The present IC can set output voltage by external reference voltage (VR) and value of output
voltage setting resistors (R1, R2). Output voltage can be set by VRxR2/(R1+R2) but it is
recommended to use at the resistance value (total: about 10 kΩ) which is not susceptible to VREF
bias current (±100nA).
C3
22μF
Connect the output capacitor between Vo terminal and GND terminal without fail in order to
stabilize output voltage. The output capacitor has a role to compensate for the phase of loop
gain and to reduce output voltage fluctuation when load is rapidly changed. When there is an
insufficient capacity value, there is a possibility to cause oscillation, and when the equivalent serial
resistance (ESR) of the capacitors is large, output voltage fluctuation is increased when load is
rapidly changed. About 22µF ceramic capacitors are recommended but output capacitor greatly
depends on temperature and load conditions.
In addition, when various capacitors are
connected in series, the total phase allowance of loop gain becomes not sufficient, and oscillation
may result.
Thoroughgoing confirmation at application temperature and under load range
conditions is requested.
C1
0.1μF
The input capacitor plays a part to lower output impedance of a power supply connected to input
terminals (Vcc). When output impedance of this power supply increases, the input voltages
(Vcc, VIN) become unstable and there is a possibility of giving rise to oscillation and degraded
ripple rejection characteristics. The use of capacitors of about 10μF with low ESR, which provide
less capacity value changes caused by temperature changes, is recommended, but since input
capacitor greatly depends on characteristics of the power supply used for input, substrate wiring
pattern, thoroughgoing confirmation under the application temperature and load range, is
requested.
C2
10μF
The input capacitor plays a part to lower output impedance of a power supply connected to input
terminals (VIN). When output impedance of this power supply increases, the input voltages (Vcc,
VIN) become unstable and there is a possibility of giving rise to oscillation and degraded ripple
rejection characteristics. The use of capacitors of about 10μF with low ESR, which provide less
capacity value changes caused by temperature changes, is recommended, but since input
capacitor greatly depends on characteristics of the power supply used for input, substrate wiring
pattern, thoroughgoing confirmation under the application temperature and load range, is
requested.
C4
1μF
The present IC can set the output voltage buildup time by VREF terminal capacitor (C4) and R1 and
R2 values. When EN terminal is “High” or UVLO is reset, output voltage is built up by the time
constant determined by C4, R1, and R2. It is recommended to use capacitors (B special) with
little capacity value change caused by temperature change for C4.
Vcc
VIN
VREF
Vo
EN
GND
VIN
ON/OFF
Ceramic Capacitor
VO
Vcc
VREF
R1
C1
C2
C3
C4
R2
VR


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