S5J2596M [SECOS]
150 KHz, 3A PWM Step-Down DC/DC Converter; 150千赫， 3A PWM降压型DC / DC转换器
| 型号： | S5J2596M |
| 厂家： | 
SECOS HALBLEITERTECHNOLOGIE GMBH |
| 描述： | 150 KHz, 3A PWM Step-Down DC/DC Converter |
| 文件： | 总6页 (文件大小：1307K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
S5J2596M
150 KHz, 3A PWM
Elektronische Bauelemente
Step-Down DC/DC Converter
Description
The S5J2596M series of regulators are monolithic integrated circuit
that provides all active functions for a step-down (buck) switching
regulator, capable of driving 3A load with excellent line and load
regulation. These devices are available in fixed output voltages of
3.3V,5V,12V and an adjustable output version. The S5J2596M
series ioerate at a switching frequency of 150 KHz; thus allowing
smaller sized filter components than what would be needed with
lower frequency switching regulators. Available in standard 5-lead
TO-252 package. Other feature include a guaranteed 4% to
tolerance on output voltage under specified input voltages and
output load conditions. The 150KHz 15% is on the oscillator
frequency. External shutdown is included, featuring 80uA(Typ.)
standby current. The output switch includes cycle-by cycle current
limiting, as well as thermal shutdown for full protection under
fault conditions.
Features
Millimeter
Millimeter
REF.
REF.
Min.
Max.
6.73
5.46
10.20
3.00
Min.
Max.
0.60
2.40
0.58
0.15
1.50
5.59
* Uses Readily Available Standard Inductors
* Operating Voltage Can Be Up To 22V
A
B
C
D
P
S
6.35
5.21
9.40
2.40
G
H
J
0.45
2.20
0.46
0
* Thermal Shutdown And Current Limit Protection
* 3.3V,5V,12V and adjustable Output Versions
K
L
1.27 REF.
0.90
5.40
* TTL Shutdown Capability
0.50
0.80
M
* Built-in TTL On/Off Control
* Guaranteed 3A Output Current
* 150 KHz Fixed Frequency Internal Oscillator
Applications
* Positive To Negative Converter
* High-Effciency Step-Down Regulator
* One-ch Switching Regulators Simple
Block Diagram
http://www.SeCoSGmbH.com/
Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page 1 of 6
S5J2596M
150 KHz, 3A PWM
Elektronische Bauelemente
Step-Down DC/DC Converter
Pin Function
Pin Name
Pin#
Function
This is the positive input supply for the IC switching regulator. A suitable input bypass capacitor
VIN
1
must be present at this pin to minimize voltage transients and to supply the switching current
needed by regulator.
Internal switch. The voltage at this pin switches between (+VIN - VSAT) and approximately -
. To minimize coupling to sensitive circuitry, the PC
board copper area connected to this pin should be keep to a minimum.
0.5V,
with a duty cycle of approximately VOUT/VIN
Output
2
Circuit ground
Ground
Feedback(FB)
3
4
Senses the regulated output voltage to complete the feedback loop.
Allows the switching regulator circuit to be shutdown using logic level signals. Thus drop the total
input supply current to approximately 150ꢀA. Pulling this pin below a threshold voltage of
ON/OFF(SD)
approximately 1.3V turns the regulator on, and pulling this pin above 1.3V (up to a maximum
18V) shuts the regulator down. If this shutdown feature is not needed, ON/OFF pin can be wired to
the ground pin.
5
of
Absolute Maximum Ratings
Parameter
Supply Voltage
Symbol
VCC
Ratings
24
Unit
V
VSD
-0.3 ~ +18
-0.3 ~ +18
-1
V
V
V
W
к
к
V
ON/OFF Pin Input Voltage
Feedback Pin Voltage
Output Voltage to ground
Power Dissipation
Storage Temperature
Operating temperature
Operating Voltage
VFB
VOUT
PD
TST
TOP
VOP
Internally Limited
-65 ~ +150
-40 ~ +125
+4.5 ~ +22
S5J2596M Electrical Characteristics
Specifications in boldface type are for full operating temperature range. The other type are for TJ=25 к.
Parameter
Symbol
Conditions
Min
1.193/1.180
Typ
Max
Unit
5≤ VIN ≤ 22V, 0.2A ≤ ILOAD ≤ 3A
VOUT=3V
VIN=12V, ILOAD=3A, VOUT=3V
1.267/1.280
Output Feedback
Efficiency
VFB
1.230
74
V
ꢁ
%
S5J2596M-33 Electrical Characteristics
Specifications in boldface type are for full operating temperature range. The other type are for TJ=25 к.
Parameter
Symbol
Conditions
5.5V ≤ VIN ≤ 22V
0.2A ≤ ILOAD ≤ 3A
VIN=12V, ILOAD=3A
Min
3.168/3.135
Typ
Max
Unit
3.432/3.465
Output Feedback
Efficiency
VFB
3.3
75
V
ꢁ
%
S5J2596M-50 Electrical Characteristics
Specifications in boldface type are for full operating temperature range. The other type are for TJ=25 к.
Parameter
Symbol
Conditions
8V ≤ VIN ≤ 22V
0.2A ≤ ILOAD ≤ 3A
VIN=12V, ILOAD=3A
Min
4.80/4.75
Typ
Max
Unit
5.20/5.25
Output Feedback
Efficiency
VFB
5.0
80
V
ꢁ
%
S5J2596M-12 Electrical Characteristics
Specifications in boldface type are for full operating temperature range. The other type are for TJ=25 к.
Parameter
Symbol
Conditions
Min
11.52/11.40
Typ
Max
Unit
15V ≤ VIN ≤ 22V
0.2A≤ ILOAD ≤3A
VIN=16V, ILOAD=3A
12.48/12.60
Output Feedback
Efficiency
VFB
12
89
V
ꢁ
%
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Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page 2 of 6
S5J2596M
150 KHz, 3A PWM
Elektronische Bauelemente
Step-Down DC/DC Converter
All Output Voltage Version Electrical Characteristics
Specifications in boldface type are for full operating temperature range. The other type are for TJ=25 к.
Parameter
Feedback bias current
Oscillator frequency
Symbol
Conditions
VFB=1.3V (adjustable version only)
Min
-
127/110
Typ
-10
150
Max
-50/-100
173/173
Unit
nA
kHz
IFB
FOSC
Oscillator frequency of
short circuit protect
When current limit occurred and
FSCP
5
-
15
25
kHz
V
VFB<0.5V, TA=25 к.
ILOAD=3A No outside circuit
VFB=0V force drive on
1.6/1.7
Saturation voltage
VSAT
1.4
Max. duty cycle (ON)
Max. duty cycle (OFF)
VFB=0V force drive on
VFB=12V force drive off
-
-
100
0
-
-
DC
%
Peak current No outside circuit
VFB=0V force drive on
5.5/6.5
Current limit
ICL
3.6
4.5
A
Output=0V, No outside circuit
VFB=12V force drive off
Output=-1V, VIN=22V
-
-
-200
uA
Output leakage current
I
L
-
-
-5
5
-
-
10
mA
mA
Quiescent current
VFB=12V force drive off
IQ
VIL
VIH
Low (Regulator ON)
High (Regulator OFF)
-
0.6
-
ON/OFF pin logic input
V
-
2.0
-
Threshold Voltage
ON/OFF pin Logic input
current
-
-
-
-0.01
-1
IH
VLOGIC=2.5V ( Regulator OFF)
VLOGIC=0.5V ( Regulator ON)
uA
ON/OFF pin input
current
-0.1
IL
Standby quiescent
I
STBY
-
-
-
150
10
200
uA
ON/OFF pin=5V, VIN=12V
Junction to Case
current
ꢀJC
-
-
к/W
Thermal Resistance
Junction to Ambient with copper
ꢀJA
50
area of approximately 2 cm2
Unless otherwise specified, VIN=12V for 3.3V, 5V, adjustable version and VIN=18V for the 12V version. ILOAD=0.5A
Function Description
The TO-252-5L surface mount package tab is designed to be soldering to the copper on a printed circuit board. The copper and the board
are the heat sink for this package and the other heat producing components, such as the catch diode and inductor. The PC board copper
area that the package is soldered to should be at least 0.8 in2 and ideally should have 2 or more square inches of 2 oz. Additional copper
area improve the thermal characteristics, but with copper areas greater than approximately 6 in2, only small improvements in heat
dissipation are realized. If further thermal improvements are needed, double sided, multi-layer PC board with large copper areas and/or
airflow will be recommended. The S5J2596M junction temperature rises above ambient temperature with a 3A load and different input and
output voltages. The data was taken with the circuit operating as a buck-switching regulator with all components mounted on a PC board
to simulate the junction temperature under actual operating conditions. This curve can be used for a quick check for the approximate
junction temperature for various conditions, but be aware that there are many factors that can affect the junction temperature. When load
current higher than 3A are used, double sided or multi-layer PC boards with large copper areas and/or airflow might be needed, especially
for high ambient temperatures and high output voltages.
For the best thermal performance, wide copper traces and generous amounts of printed circuit board copper should be used in the board
layout. (One exception to this is the output (switch) pin, which should not have large areas of copper.) Large areas of copper provide the
best transfer of heat (lower thermal resistance) to the surrounding air, and moving air lowers the thermal resistance even further.
Package thermal resistance and junction temperature rise numbers are all approximate, and there are many factors will affect these
numbers. Some of these factors include board size, shape, thickness, position, location and even board temperature. Other factors are,
trace width, total printed circuit copper area, copper thickness, single or double-sided, multi-layer board and the amount of solder on the
board. The effectiveness of the PC board to dissipate heat also depends on the size, quantity and spacing of other components on the
board, as well as the surrounding air is still or moving. Furthermore, some of these components such as the catch diode will add heat to
the PC board and the heat can vary as the input voltage changes. For the inductor, depending on the physical size, type of core material
and the DC resistance, it could either act as a heat sink taking heat away from the board, or it could add heat to the board.
h tp://www.SeCoSGmbH.com/
Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page 3 of 6
S5J2596M
150 KHz, 3A PWM
Elektronische Bauelemente
Step-Down DC/DC Converter
Typical Application Circuit
(1)Fixed Type Circuit
S5E2596M
S5E2596M
S5J2596M
S5E2596M
SS5S5E5E2E2525959696M6MM
SS55EE22559966MM
SSS5S5E5E5E2E2525295956969M6M6MM
SS55EE22559966MM
SS55EE22559966MM
S5E2596M
-33
-33
-33
--3-33-333
B--3M333KFE
--33--33333
BMKFE
BM-3-K33FE
BBMMKKFFEE
--3333
-33
(2)Adjustable Type Circuit
BMKFE
BSS55MEJ22K5599F66MEM
BMKFE
BMKFE
BBMBMKMKFKFEFEE
BMKFE
BBMMKKFFEE
B-M33KFE
(3)Delay Start Circuit
BMKFE
SB5MJ25K96FME
BMKFE
BMBKMFKEFE
BMKFE
BMKFE
BMKFE
BBMMBKKMFFKEEFE
BMKFE
5
3
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Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page 4 of 6
S5J2596M
150 KHz, 3A PWM
Elektronische Bauelemente
Step-Down DC/DC Converter
Typical Performance Characteristics
http://www.SeCoSGmbH.com/
Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page 5 of 6
S5J2596M
150 KHz, 3A PWM
Elektronische Bauelemente
Step-Down DC/DC Converter
http://www.SeCoSGmbH.com/
Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page 6 of 6
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