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SI-3011ZF Folha de dados(PDF) 6 Page - Sanken electric

Nome de Peças SI-3011ZF
Descrição Electrónicos  High-Current, Low-Dropout, 1.1 to 5 V Regulator
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Fabricante Electrônico  SANKEN [Sanken electric]
Página de início  http://www.sanken-ele.co.jp/en
Logo SANKEN - Sanken electric

SI-3011ZF Folha de dados(HTML) 6 Page - Sanken electric

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SANKEN ELECTRIC CO., LTD.
SI-3011ZF
High-Current, Low-Dropout, 1.1 to 5 V Regulator
SI-3011ZF
Input Capacitor
(CI, approximately 10 μF). This is necessary
either when the input line includes inductance or when the wiring
is long.
Output Capacitor
(CO , > 47 μF). This device is not designed
for a use with a very low ESR output capacitor such as a ceramic
capacitor. Output oscillation may occur with that kind of capaci-
tor.
Output Voltage Adjustable Resistors
(R1 and R2). The
output voltage is adjusted by R1 and R2. 10 kΩ or
11 kΩ for R2 is recommended.
R1 = (VO – Vref ) / (Vref / R2)
For an output voltage of 1.8 V or less, add a 10 kΩ resistor
between ADJ and the junction of R1 and R2.
Determination of DC Input Voltage
. The minimum input
voltage VI(min) should be higher than the sum of the fixed out-
put voltage and the maximum rated dropout voltage. If setting
the output voltage lower than 2.0 V, the minimum input voltage
should be more than 2.4 V.
Overcurrent Protection
. The SI-3000ZD series has a built-in
fold-back type overcurrent protection circuit, which limits the
output current at a start-up mode. It thus cannot be used in appli-
cations that require current at the start-up mode such as:
(1) constant-current load,
(2) power supply with positive and negative outputs to common
load (a center-tap type power supply), or
(3) raising the output voltage by putting a diode or a resistor
between the device ground and system ground.
Thermal Protection
. Circuitry turns off the pass transistor
when the junction temperature rises above 135°C. It is intended
only to protect the device from failures due to excessive junction
temperatures and should not imply that output short circuits or
continuous overloads are permitted.
Heat Radiation and Reliability
. The reliability of the IC
is directly related to the junction temperature (TJ) in its opera-
tion. Accordingly, careful consideration should be given to heat
dissipation. The graph on page 2 illustrates the effect of thermal
resistance on the allowable package power dissipation.
The junction temperature (TJ ) can be determined from either of
the following equations:
TJ = ( PD × RθJA) + TA
or
TJ = ( PD × RθJC) + TC
where
PD = IO × (VI – VO) and
RθJC = 5 °C/W.
Parallel Operation
. Parallel operation to increase load current
is not permitted.


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