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PDF SC1409ISTR Data sheet ( Hoja de datos )
| Número de pieza | SC1409ISTR | |
| Descripción | 1 A Synchronous Switching Regulator | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC1409ISTR (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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1 A Synchronous Switching Regulator SC1409
June 28, 2000
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC1409 is a versatile, voltage-mode switching
regulator designed for use in battery operated power
supply applications. A simple, fixed-voltage buck regu-
lator can be implemented using the SC1409 with a
minimum of external components. Internal MOSFETs
and control circuitry minimize board space and design
time. The small device footprint allows for compact
circuit design.
SC1409 features include a temperature compensated
voltage reference, triangle wave oscillator, hiccup
mode current limit, an internally compensated error
amplifier, overcurrent temperature protection, soft
start, and under voltage lock out.
The SC1409 operates at a selectable, fixed frequency
of 300kHz or 500kHz, or can be synchronized to an
external clock within this range, providing an optimum
compromise between efficiency, external component
size, and cost.
FEATURES
•= Internal MOSFETs
•= Excellent efficiency >88%
•= 1% Voltage accuracy
•= Built-in over current protection
•= 1A Output current
•= 5µA Standby current
•= Industrial temperature range
•= 300kHz/500kHz selectable frequency
APPLICATIONS
•= Handheld equipment
•= PDA power supplies
•= Notebook I/O power supplies
•= Peripheral card supplies
•= High density DC/DC conversion
ORDERING INFORMATION
DEVICE(1)
PACKAGE
SC1409ISTR
SO-8
Note:
(1) Only available in tape and reel packaging. A reel
contains 2500 devices.
APPLICATION CIRCUIT
Vin=5V
Vout R3 R4
3.45V 1.87k 1.00k
3.30V 1.74k 1.00k
3.10V 1.58k 1.00k
2.90V 1.40k 1.00k
2.80V 1.33k 1.00k
2.50V 1.07k 1.00k
1.50V 249 1.00k
+
C1
47uF/16V
C3
0.033uF
R1
OPEN
U1
1 SYNC/FSET ISET 8
2 EN/SS
VIN 7
3 AGND
PHASE 6
4 FB
PGND 5
SC1409IS
C6
0.1uF
L1 100uH
R2
R4
Vout
+
C2
47uF/16V
© 2000 SEMTECH CORP.
1
652 MITCHELL ROAD NEWBURY PARK CA 91320
1 page  
1 A Synchronous Switching Regulator SC1409
June 28, 2000
8.0
7.0
6.0
Shutdown Quiescent Current
5.0
4.0
3.0
2.0 Quiescent Current
1.0
0.0
-50
-25
0 25 50 75
Temperature (oC)
Quiescent current vs temperature
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
100 125
0.45
0.40
P-Channel (Topside)
0.35
0.30
0.25
0.20 N-Channel (Bottomside)
0.15
0.10
0.05
0.00
-50
-25
0 25 50 75
Temperature (oC)
FET RDS(ON) vs temperature
100 125
50
45
40
35
30
25
20
15
10
5
0
-50
-25
0 25 50
Temperature (oC)
Soft start current vs temperature
75
100 125
550 100
500
Frequency (FSET=VIN)
450
98
96
400
Max Duty Cycle
350
94
92
300
250
-50
-25
Frequency (FSET=GND)
0 25 50 75
Temperature (oC)
100
90
88
125
Frequency and max. duty cycle vs temperature
4.5
4.4
4.3 VIN Increasing
4.2
4.1
4.0
3.9
-50
-25
VIN Decreasing
0 25 50
Temperature (oC)
UVLO trip point vs temperature
75
100 125
1.206
1.204
1.202
1.200
1.198
1.196
-50
-25
0 25 50
Temperature (oC)
Reference voltage vs temperature
75
100 125
© 2000 SEMTECH CORP.
5
652 MITCHELL ROAD NEWBURY PARK CA 91320
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet SC1409ISTR.PDF ] | |
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