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SI-3025LSA Schematic ( PDF Datasheet ) - Allegro MicroSystems

Teilenummer SI-3025LSA
Beschreibung LOW-VOLTAGE/ HIGH-CURRENT 2.5 V LINEAR REGULATOR
Hersteller Allegro MicroSystems
Logo Allegro MicroSystems Logo 




Gesamt 10 Seiten
SI-3025LSA Datasheet, Funktion
SI-3025LSA
IN 1
INTERNAL
CONNECTION
2
IC
SUPPLY 3 VS
ENABLE 4
8 OUT
7 OUT
VR SUB
6 GND
5 GND
Dwg. PK-012
ABSOLUTE MAXIMUM RATINGS
Input Voltage, VI ................................ 16 V
Supply Voltage, VS ............................ 16 V
Continuous Output Current, IO ........ 1.0 A*
Logic Input Voltage, VE ......................... VS
Package Power Dissipation,
PD ........................................ See Graph
Output Junction Temperature,
TJ ............................................ +150°C
Operating Temperature Range,
TA ............................... -30°C to +100°C
Storage Temperature Range,
Tstg ............................. -30°C to +150°C
* Output current rating may be limited by duty
cycle, ambient temperature, and heat sinking.
Under any set of conditions, do not exceed the
specified current rating or a junction temperature
of 150˚C.
† Fault conditions that produce excessive
junction temperature will activate the device’s
thermal shutdown circuitry. These conditions
can be tolerated but should be avoided.
LOW-VOLTAGE, HIGH-CURRENT
2.5 V LINEAR REGULATOR
The SI-3025LSA is designed to meet the requirement for increased
integration and reliability in low-voltage, high-current, linear regulator
applications such as personal computers (PCs) and set-top boxes. Each
device incorporates a monolithic low-level reference and control circuit
with a high-current pnp transistor in a power multi-chip module
(PMCM™). Regulated output voltages of 1.8 V or 3.3 V are also
available.
The high-current pass element provides a low dropout voltage with
output current to 1 A. Regulator accuracy of ±2 % and excellent
temperature characteristics are provided. The logic-compatible
ENABLE input gives the designer complete control over power up,
power down, and standby or sleep.
These devices are supplied in a fully molded 8-lead miniature
surface-mount package (tape and reel) with enhanced power-dissipating
qualities. They are rated for continuous operation between -30°C and
+100°C.
FEATURES
s 1 A Output Current
s Low Dropout voltage
s LSTTL/CMOS-Compatible On/Off Control
Less Than 1 µA “Sleep” Current
s Internal Foldback Overcurrent Limiting
s Internal Thermal Shutdown
s Surface-Mount Package
Always order by complete part number: SI-3025LSA-TL ,
where “-TL” indicates tape and reel.
TM






SI-3025LSA Datasheet, Funktion
SI-3025LSA
LOW-VOLTAGE, HIGH-CURRENT
2.5 V LINEAR REGULATOR
APPLICATIONS INFORMATION
Thermal shutdown and heat sinking. Thermal protection
circuitry turns off the device should the junction temperature rise
above 135°C. This is intended only to protect the device from
failures due to excessive junction temperatures and should not
imply that high-temperature operation is permitted. Ambient
temperature is affected by air circulation and proximity to other
heat-producing components. Normal operation is resumed when
the junction temperature is reduced. Output terminals 7 and 8
are the lead frame and substrate of the pass transistor and
provide a low thermal-resistance path for heat sinking.
In general, the maximum ambient temperature has the most
effect on determining the heat sinking that is needed to maintain
a safe normal operating junction temperature. The maximum
heat sinking thermal resistance (RθJA) can be calculated as
RθJA
=
(135
T)
A
/
I
O
(V
I
2.5)
where TA is the maximum ambient temperature in °C,
IO is the maximum output (load) current in amperes, and
VI is the maximum input voltage in volts.
The following graph gives the required copper foil area
(soldered to leads 7 and 8) to provide the required thermal
resistance. Note that more is always better and both sides of the
printed wiring board can be used.
ENABLE input. The ENABLE input includes an internal pull-
2000
1000
GLASS-EPOXY
PRINTED WIRING BOARD
down resistor. If this terminal is not connected (open-circuit
fault), the device output is turned off.
Overcurrent protection. The SI-3025LSA includes an
overcurrent protection circuit, which limits the output current at
start up. It thus cannot be used with
1) a constant-current load,
2) a power supply with positive and negative to a common load
(center-tap type power supply),
3) a series power supply, or
4) a diode or resistor in series with the device ground to raise
the output voltage.
Input voltage. Including ripple voltage and transients, the
minimum input voltage should be greater than the sum of the
output voltage and the maximum rated dropout voltage; the
maximum input voltage must be less than the absolute maximum
rated input voltage (16 V).
In most applications, the input voltage (terminal 1, VI) and
the supply voltage (terminal 3, V ) are connected together.
S
Output capacitor. A 22 µF tantalum electrolytic capacitor is
recommended between the output and ground. Very-low ESR
capacitors should not be used.
Input capacitor. A 0.1 µF to 10 µF tantalum capacitor is
recommended between the input and ground to prevent oscilla-
tion.
500
300
200
100
90
100
110 120 130
JUNCTION-TO-AMBIENT THERMAL RESISTANCE in °C/W
Dwg. GK-031
115 Northeast Cutoff, Box 15036
TM
6 Worcester, Massachusetts 01615-0036 (508) 853-5000

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