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PDF SI-8005Q Data sheet ( Hoja de datos )
| Número de pieza | SI-8005Q | |
| Descripción | Step-Down Switching Regulator | |
| Fabricantes | Sanken | |
| Logotipo |  |
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SI-8005Q
Step-Down Switching Regulator with Current-Mode Control
Features and Benefits
▪ Current-mode control system employed
▪ Excellent line regulation (60 mV maximum)
▪ 165 mΩ maximum on-resistance of built-in MOSFET
▪ Output current 3.5 A
▪ Wide range of input voltages (4.75 to 28 V), supports
24 V direct drive
▪ Output voltage 0.5 to 24 V, compatible with various IC
power supply voltages, through low VREF of 0.5 V.
▪ High efficiency, 94% maximum at VIN = 8 V, VO = 5 V,
and IO = 0.5 A
▪ Operating frequency 500 kHz, supports downsizing of
smoothing choke coil
▪ Soft start and output on/off functions built-in
▪ Built-in protection:
▫ Drooping overcurrent protection
▫ Overtemperature protection
▫ Undervoltage lockout (UVLO)
Package: HSOP8 surface mount with
exposed thermal pad
Description
The SI-8005Q is a step-down switching regulator IC, designed as
an output voltage regulator at the secondary stage of switch mode
power supplies.The current-mode control system permits small
ceramic capacitors to be used as output capacitors. Together
with the compact HSOP8 package, this allows reduction of
regulator circuitry area on the PCB by approximately 50% in
comparison with conventional topologies.
Designed to save power, losses in the SI-8005Q are reduced
by controlling the maximum on-resistance of a built-in output
MOSFETto as low as 165 mΩ. Furthermore, die miniaturization
has been accomplished through a proprietary BCD process.
The SI-8005Q supplies an output current of 3.5 Aand an output
voltage that is variable from 0.5 to 24 V, which is easily set to
a voltage compatible with the diverse reduced power supply
voltages required by signal processing ICs. Accepting a wide
input voltage range, from 4.75 to 28 V, the SI-8005Q can be
driven directly by a 24 V power supply.
Applications include power supplies for signal processing ICs
for memories and microcomputers used in plasma display panel
(PDP) TVs, liquid crystal display (LCD) TVs, computer hard
drives, and DVD recorders.
Not to scale
Functional Block Diagram
VIN
2 IN
C1
EN
３
7
ON/
OFF
OSC
Σ
5v_ldo
P.REG
Current
Sense
Amp
OCP
Boot
REG
VREF
0.5V
OVP
TSD
PWM
LOGIC
DRIVE
４
5v_ldo
３
COMP
6
C3
R3
１
GND 4
UVLO
0.5V
Amp
SS 8
C5
BS
６
1
C4
SW L1
3
Di
R1
FB
5
R2
VO
C2
27469.058, Rev. 1
1 page  
SI-8005Q
Step-Down Switching Regulator with Current-Mode Control
6
5
Overcurrent
Protection
Load = CR
4
3
2
1
0
0
Load
Regulation
5.05
5.04
5.03
5.02
5.01
5.00
4.99
4.98
4.97
4.96
4.95
0
Quiescent
Current versus
Input Voltage
VEN = 0 V
10
9
8
7
6
5
4
3
2
1
0
0
Operating
Frequency versus
Output Current
550
540
530
520
510
500
490
480
470
460
450
0
Performance Characteristics
at TA = 25°C
6
0A
1A
2A
3A
Overcurrent
Protection
5
4
3
IO 2 VIN
1
2 4 6 8 10
VIN (V)
0
0
25
1
20 V
24 V
28 V
234
IO (A)
8V
12 V
15 V
56
28 V
20 V
15 V
8 V 12 V
VIN
Quiescent
Current versus
Input Voltage
IO = 0 A
20
15
10
5
12345
IO (A)
0
0
6
5
Overvoltage
Protection
VIN = 12 V
IO = 0 A
4
3
2
1
10 20
VIN (V)
8V
12 V
15 V
30
VIN
20 V
24 V
28 V
1234
IO (A)
0
40 120
550
540
530
520
Operating
Frequency versus
Input Voltage
510
500
490
480
470
460
450
50
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
10 20
VIN (V)
OTP On
OTP Off
130
140
TJ (°C)
10 20
VIN (V)
30
150
30
40
160
40
5
5 Page 
SI-8005Q
Step-Down Switching Regulator with Current-Mode Control
Cautions
In general, the junction temperature level of surface mount pack-
age ICs is dependent upon the area and material of the PC board
and its copper area. Therefore, please design the PCB to allow
sufficient margin for heat dissipation.
Parallel Operation Parallel operation of multiple products to
increase the current is not allowed.
Thermal Shutdown The SI-8000Q series has a thermal protec-
tion circuit. This circuit keeps the IC from the damage by over-
load. But this circuit cannot guarantee the long-term reliability
against the continuous overload conditions.
ESD Susceptibility Take precautions against damage by static
electricity.
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 im-
provements 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 equip-
ment, 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 publication 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.
Copyright © 2009 Allegro MicroSystems, Inc.
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
11
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| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet SI-8005Q.PDF ] | |
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