SI-3025ZF [ALLEGRO]
High-Current, Low-Dropout, 2.5 V Regulator; 大电流，低压差， 2.5 V稳压器
| 型号： | SI-3025ZF |
| 厂家： | 
ALLEGRO MICROSYSTEMS |
| 描述： | High-Current, Low-Dropout, 2.5 V Regulator |
| 文件： | 总8页 (文件大小：214K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SI-3025ZF
High-Current, Low-Dropout, 2.5 V Regulator
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-3025ZF 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 an adjustable 1.2 ~ 5 V output or a 3.3 V fixed
output 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 700 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 fully molded TO-220-style 5-lead
flange-mounted , high power, isolated plastic package. A similar device
in a lower-power surface-mount plastic package is the SI-3025ZD.
FEATURES
■ 3 A Output Current at 2.5 V
■ 0.7 V Maximum Dropout Voltage at IO = 3 A
■ 1 µA Maximum Standby Current
■ RemoteVoltageSensing
■ Foldback Current Limiting
■ ThermalProtection
ABSOLUTE MAXIMUM RATINGS
Input Voltage, VI . . . . . . . . . . . . . 10 V
Output Current, IO . . . . . . . . . . . . . 3 A*
Enable Input Voltage, VE . . . . . . . . 6 V
Junction Temperature, TJ . . . . +125°C
APPLICATIONS
■ TVs, VCRs, Electronic Games
■ Embedded Core, Memory, or Logic Supplies
■ Printers and Other Office Equipment
■ Industrial Machinery
Storage Temperature Range,
■ Secondary-Side Stabilization of Multi-Output SMPS
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.
Always order by complete part number, e.g., SI-3025ZF .
Sanken Power Devices
from Allegro MicroSystems
SI-3025ZF
High-Current,
Low-Dropout,
2.5 V Regulator
FUNCTIONAL BLOCK DIAGRAM
Allowable Package Power Dissipation
Recommended Operating Conditions
Min
—
Max Units
DC Input Voltage
6
3
V
DC Output Current
0
A
Operating Junction Temp.
-20
+100
°C
For the availability of parts meeting -40°C requirements,
contact Allegro’s Sales Representative.
This data sheet is based on Sanken data sheet SSJ-02578
115NortheastCutoff, Box15036
Worcester,Massachusetts01615-0036
2
Copyright © 2004, 2005 Allegro MicroSystems, Inc.
SI-3025ZF
High-Current,
Low-Dropout,
2.5 V Regulator
ELECTRICAL CHARACTERISTICS at TA = +25°C, VE = 2 V (unless otherwise noted).
Limits
Characteristic
Symbol Test Conditions
Min.
2.45
—
Typ. Max.
Units
V
Output Voltage
VO
VO(off)
aVO
VI = 3.3 V, IO = 10 mA
VE = 0 V
2.50 2.55
—
±0.3
—
0.5
—
V
Output Volt. Temp. Coeff.
Output Short-Circuit Current
Line Regulation
0°C ≤ TJ ≤ 100°C
VI = 3.3 V, see note
VI = 3.0 ~ 5.0 V, IO = 10 mA
VI = 3.3 V, IO = 0 A ~ 3.0 A
IO = 3.0 A
—
mV/°C
A
IOM
3.2
—
—
∆VO(∆VI)
∆VO(∆IO)
VImin - VO
IGND
—
10
mV
mV
V
Load Regulation
—
—
40
Dropout Voltage
—
—
0.7
1.5
1.0
—
Ground Terminal Current
VI = 3.3 V, IO = 0 mA, VE = 2.0 V
VI = 3.3 V, VE = 0 V
Output ON
—
1.0
—
mA
µA
V
—
Enable Input Voltage
Enable Input Current
VEH
VEL
IEH
2.0
—
—
Output OFF
—
0.8
100
-5.0
—
V
VE = 2.7 V
—
—
µA
µA
dB
°C
IEL
VE = 0 V
—
0
Ripple Rejection Ratio
Thermal Shutdown
PSRR
TJ
VI = 3.3 V, 100 Hz ≤ f ≤ 120 Hz
—
60
152
135
—
Typical values are given for circuit design information only.
Note: Output short-circuit current is at point where output voltage has decreased 5% below VO(nom)
.
www.allegromicro.com
3
SI-3025ZF
High-Current,
Low-Dropout,
2.5 V Regulator
TYPICAL CHARACTERISTICS
(TA = 25°C)
ꢀ Dropout Voltage
ꢀ Low-Voltage Behavior
ꢀ GND Pin Current
ꢀ Line Regulation
ꢀ Load Regulation
ꢀ Overcurrent Protection
ꢀ ENABLE Control Voltage
ꢀ ENABLE Control Current
ꢀ Thermal Protection
115NortheastCutoff, Box15036
Worcester,Massachusetts01615-0036
4
SI-3025ZF
High-Current,
Low-Dropout,
2.5 V Regulator
APPLICATIONS INFORMATION
Input Capacitor (CI, approximately 10 µF). This is
necessary either when the input line includes inductance or
when the wiring is long.
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 graph on page 2 illustrates
the effect of thermal resistance on the allowable package
powerdissipation.
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.
When mounting to a heat sink, apply silicone grease (Shin-
Etsu Chemical G746, Dow Corning Toray Silicone SC102,
or Toshiba Silicone SY6260). Recommended mounting
hardware torque: 0.588 ~ 0.686 Nm or 6.0 ~ 7.0 kgf•cm
(4.34 ~ 5.06 lbf•ft).
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.
The junction temperature (TJ) can be determined from
either of the following equations:
Increased Output Voltage. The output voltage (VO)
may be increased by inserting a resistor (REXT) between
SENSE and OUTPUT. The current flowing into SENSE is
typically 90 µA ±30%. To minimize the effect of ISENSE
and temperature on REXT, it is recommended that a 6.8 kΩ
resistor be added between SENSE and GND to increase the
current in REXT. The value of REXT is then
TJ = (PD × RθJA) + TA
or
TJ = (PD × RθJC) + TC
where PD = IO × (VI – VO) and
RθJC = 5°C/W.
R
EXT = (VO – 2.5) × 106/458
Parallel Operation. Parallel operation to increase load
current is not permitted.
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.
www.allegromicro.com
5
SI-3025ZF
High-Current,
Low-Dropout,
2.5 V Regulator
Dimensions in Millimeters
Terminal Finish: Sn–3Ag–0.5Cu, 2nd level interconnect category (e1)
Product Weight: Approx. 2.3 g
Terminal spacing is measured at lead tips.
115NortheastCutoff, Box15036
Worcester,Massachusetts01615-0036
6
SI-3025ZF
High-Current,
Low-Dropout,
2.5 V Regulator
Shipping Container Dimensions in Millimeters
Primary Packing: A U-shaped cardboard separator (Fig. 1) is
used to accommodate a maximum of 100 pieces (5 × 20) and, if
less than 100 pieces, a shock absorber shall be placed in the
vacant space. Each thin primary carton (Fig. 2) will contain a
maximum of 400 pieces in four rows.
Secondary Packing: The secondary carton (Fig. 3) contains
nine thin cartons.
EI16EI
www.allegromicro.com
7
SI-3025ZF
High-Current,
Low-Dropout,
2.5 V Regulator
The products described herein are manufactured in Japan by Sanken
Electric Co., Ltd. for sale by Allegro MicroSystems, Inc.
Sanken and Allegro reserve the right to make, from time to time, such
departures from the detail specifications as may be required to permit
improvements in the performance, reliability, or manufacturability of its
products. Therefore, the user is cautioned to verify that the information
in this publication is current before placing any order.
When using the products described herein, the applicability and
suitability of such products for the intended purpose shall be reviewed at
the users responsibility.
Although Sanken undertakes to enhance the quality and reliability of
its products, the occurrence of failure and defect of semiconductor
products at a certain rate is inevitable.
Users of Sanken products are requested to take, at their own risk,
preventative measures including safety design of the equipment or
systems against any possible injury, death, fires or damages to society
due to device failure or malfunction.
Sanken products listed in this publication are designed and intended
for use as components in general-purpose electronic equipment or
apparatus (home appliances, office equipment, telecommunication
equipment, measuring equipment, etc.). Their use in any application
requiring radiation hardness assurance (e.g., aerospace equipment) is
not supported.
When considering the use of Sanken products in applications where
higher reliability is required (transportation equipment and its control
systems or equipment, fire- or burglar-alarm systems, various safety
devices, etc.), contact a company sales representative to discuss and
obtain written confirmation of your specifications.
The use of Sanken products without the written consent of Sanken in
applications where extremely high reliability is required (aerospace
equipment, nuclear power-control stations, life-support systems, etc.) is
strictly prohibited.
The information included herein is believed to be accurate and
reliable. Application and operation examples described in this publica-
tion are given for reference only and Sanken and Allegro assume no
responsibility for any infringement of industrial property rights,
intellectual property rights, or any other rights of Sanken or Allegro or
any third party that may result from its use.
115NortheastCutoff, Box15036
Worcester,Massachusetts01615-0036
8
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