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PDF SI-3011ZD Data sheet ( Hoja de datos )
| Número de pieza | SI-3011ZD | |
| Descripción | High-Current / Low-Dropoiut / 1.1 - 5V Regulator | |
| Fabricantes | Allegro MicroSystems | |
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( DataSheet : www.DataSheet4U.com )
LRinegeuarlators
SI-3011ZD
High-Current, Low-Dropout, 1.1~5 V Regulator
ABSOLUTE MAXIMUM RATINGS
Input Voltage, VI . . . . . . . . . . . . . 10 V
Output Current, IO . . . . . . . . . . . . . 3 A*
Enable Input Voltage, VE . . . . . . . . 6 V
Junction Temperature, TJ . . . . +125°C
Storage Temperature Range,
TS . . . . . . . . . . . . -40°C to +125°C
* Output current rating is limited by input
voltage, duty cycle, and ambient tempera-
ture. Under any set of conditions, do not
exceed a junction temperature of +125°C.
Designed to meet the high-current requirements in industrial and
consumer applications; embedded core, memory, or logic supplies; TVs,
VCRs, and office equipment, the SI-3011ZD voltage regulator offers the
reduced dropout voltage and low quiescent current essential for im-
proved efficiency. This device delivers a regulated output at up to 3 A.
Integrated thermal and overcurrent protection enhance overall system
reliability. Devices with fixed output voltages of 2.5 or 3.3 V are also
available.
Quiescent current does not increase significantly as the dropout
voltage is approached, an ideal feature in standby/resume power systems
where data integrity is crucial. Regulator accuracy and excellent
temperature characteristics are provided by a bandgap reference. An
LS-TTL/CMOS-compatible input gives the designer complete control
over power up, standby, or power down. A pnp pass element provides a
dropout voltage of less than 600 mV at 3 A of load current. Low output
voltages eliminate the need for expensive PWM buck converters. The
low dropout voltage permits more efficient regulation before output
regulation is lost.
This device is supplied in a 5-lead surface-mount plastic package
(TO-263) with ground tab to provide a low-resistance path for maximum
heat dissipation. A similar device in a flange-mounted (TO-220-style)
high-power package is the SI-3011ZF.
FEATURES
■ 3 A Output Current
■ Adjustable 1.1~ 5 V Output Voltage
■ 0.6 V Maximum Dropout Voltage at IO = 3 A
■ Fast Transient Response
■ 1 µA Maximum Standby Current
■ Remote Voltage Sensing
■ Foldback Current Limiting
■ Ground Tab for Superior Heat Dissipation
■ Thermal Protection
APPLICATIONS
■ TVs, VCRs, Electronic Games
■ Embedded Core, Memory, or Logic Supplies
■ Printers and Other Office Equipment
■ Industrial Machinery
■ Secondary-Side Stabilization of Multi-Output SMPS
Always order by complete part number, e.g., SI-3011ZD-TL ,
where “-TL” indicates tape and reel.
www.DataSheet4U.com
Sanken Power Devices
from Allegro MicroSystems
1 page  
LRinegeuarlators
SI-3011ZD
High-Current,
Low-Dropout,
1.1~5 V Regulator
APPLICATIONS INFORMATION
Input Capacitor (CI, 0.1 µF to 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 capacitor.
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.
Heat Radiation and Reliability. The reliability of the
IC is directly related to the junction temperature (TJ) in its
operation. Accordingly, careful consideration should be
given to heat dissipation.
The inner frame on which the integrated circuit is mounted
is connected to the GND terminal (pin 3). Therefore, it is
very effective for heat radiation to enlarge the copper area
that is connected to the GND terminal. The graph illus-
trates the effect of the copper area on the junction-to-
ambient thermal resistance (RθJA).
Determination of DC Input Voltage. The minimum
input voltage VI(min) should be higher than the sum of the
fixed output 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 applications 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.
The junction temperature (TJ) can be determined from
either of the following equations:
TJ = (PD × RθJA) + TA
or
TJ = (PD × RθJT) + TT
where PD = IO × (VI – VO) and
RθJT = 3°C/W.
Parallel Operation. Parallel operation to increase load
current is not permitted.
www.allegromicro.com
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| PDF Descargar | [ Datasheet SI-3011ZD.PDF ] | |
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