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PDF LA5757TP Data sheet ( Hoja de datos )
| Número de pieza | LA5757TP | |
| Descripción | Separately-excited Step-down Switching Regulator | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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Ordering number : ENA1439
LA5757TP
Monolithic Linear IC
Separately-excited Step-down
Switching Regulator
(Variable Type)
http://onsemi.com
Overview
The LA5757TP is a separately-excited step-down switching regulator (variable type).
Features
• Output smoothing condenser can use a Low ESR condenser for the reliability improvement
• High efficiency
• Four external parts
• Time-base generator (300kHz) incorporated
• Current limiter incorporated
• Thermal shutdown circuit incorporated
• Soft start circuit incorporated
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Input voltage
Output current
SW pin application reverse
Allowable power dissipation
VIN max
IO max
VSW
Pd max
Mounted on a specified board*
Operating temperature
Topr
Storage temperature
Tstg
* Specified board: 114.3mm × 76.1mm × 1.6mm, glass epoxy board.
Ratings
34
1.5
-1
1.1
-30 to +125
-40 to +150
Unit
V
A
V
W
°C
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Recommended Operating Conditions at Ta = 25°C
Parameter
Input voltage range
Symbol
VIN
Conditions
Ratings
4.5 to 32
Unit
V
Semiconductor Components Industries, LLC, 2013
August, 2013
40809 MS 20090326-S00004 No.A1439-1/6
1 page  
Timing Chart
VIN
LA5757TP
SWOUT
VOUT
Td Tss
Overcurrent protection characteristic
8
VIN = 12V
7
VO = 5V
CIN = 1000μF
COUT = 470μF
6 L = 68μH
5
4
3
2
1
0
0 0.4 0.8 1.2 1.6 2.0
Load current, IL -- A
VOsat -- ISW
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0 0.25 0.5 0.75 1.0 1.25 1.5
Switch current, ISW -- A
90 Efficiency -- VIN
85
IO = 0.5A
80
1.5A
1.0A
75
70
65
60
0 10 20 30 40
Input voltage, VIN -- V
ISTB -- VIN
250
200
150
100
50
0
0 10 20 30 40
Input voltage, VIN -- V
No.A1439-5/6
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet LA5757TP.PDF ] | |
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