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PDF SC1408IS.TR Data sheet ( Hoja de datos )
| Número de pieza | SC1408IS.TR | |
| Descripción | LOW VOLTAGE/ BOOST DC-DC CONTROLLER | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC1408IS.TR (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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LOW VOLTAGE, BOOST DC-DC
CONTROLLER
SC1408
August 22, 2000
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC1408 is a low voltage boost controller that oper-
ates from a 1.8V to 16.5V input range. A shutdown pin
allows the user to turn the controller off reducing sup-
ply current to less than 2µA typical. Output voltage can
be preset to 5V or is adjustable from 3V to 16.5V with
a resistor divider. The controller changes frequency in
low load conditions to improve efficiency.
The SC1408 was designed for two cell Alkaline or sin-
gle cell Lithium Ion battery applications. With the
proper external components it can be used as a boost
converter or a buck/boost converter.
A current sense is implemented with an external resis-
tor that is not in the load current path.
The SC1408 operates in “bootstrapped” mode. When
the input voltage to the device is less than 2.5V during
startup, a low voltage 50% fixed duty cycle oscillator is
switched in to initiate boost action.
FEATURES
•= 1.8V to 16.5V input range
•= Up to 10W output power
•= Preset 5V or adjustable output
•= Up to 300kHz switching frequency
•= 10µA max shutdown current
•= Industrial temperature range
•= SO-8 or MSOP-8 package
APPLICATIONS
•= PDA Power supplies
•= Battery powered applications
•= Positive LCD Bias generator
•= Portable communications (cellular phones)
•= Peripheral card supplies
•= Industrial power supplies
ORDERING INFORMATION
Part Number(1)
SC1408IS.TR
Package
SO-8
Temp. Range (TA)
-40° to +85°C
SC1408IMS.TR MSOP-8
Note:
(1) Only available in tape and reel packaging. A reel
contains 2500 devices.
TYPICAL APPLICATION - BOOST CONFIGURATION
Vin (1.8V to 16.5V)
L1
D1 Vout (3V to 16.5V)
+
C2
U1
2 BST
GATE 1
4 SHDN ISENSE 8
5 REF
FB 3
7 GND AGND 6
SC1408IS
C5
Q1 R3
+ C3
R2 R4
© 2000 SEMTECH CORP.
1
652 MITCHELL ROAD NEWBURY PARK CA 91320
1 page  
LOW VOLTAGE, BOOST DC-DC
CONTROLLER
August 22, 2000
Fig. 1: Typical Application - Boost Configuration
SC1408
Vin=3.3V
L1 22uH
COILCRAFT DO3316P-223
C2
100uF +
U1
2 BST
GATE 1
4 SHDN ISENSE 8
5
REF
3
FB
7 GND
AGND 6
C5
0.1uF
SC1408IS
D1
B130T
Q1
IRLR024N
R3
31.6k
Vout=5V
C9
(1) + C8
100uF
R2
0.05Ohm
R4
10.0k
+
C3
100uF
(1) See Component Selection
Fig. 2: Typical Application - Buck/Boost (SEPIC) Configuration
D2 1N4148
Vin=2.7V to 6V
C2
100uF +
L1A 22uH
21
C4
0.1uF
U1
2 BST
GATE 1
4 SHDN ISENSE 8
5 REF
FB 3
7 GND
AGND 6
C5
0.1uF
SC1408IS
C1
100uF
+
Q1
IRLL3303
D1
B130T
R3
31.6k
C9
(1)
4
R2
0.05Ohm
L1B
22uH
R4
10.0k
3
L1A/L1B IS COUPLED INDUCTOR
PULSE PE-53718 OR
EQUIVALENT
(1) See Component Selection
Vout=5V
+ C8
100uF
+
C3
100uF
© 2000 SEMTECH CORP.
5
652 MITCHELL ROAD NEWBURY PARK CA 91320
5 Page 
August 22, 2000
OUTLINE DRAWING - SO-8
LOW VOLTAGE, BOOST DC-DC
CONTROLLER
SC1408
JEDEC
REF: MS-012AA
LAND PATTERN - SO-8
© 2000 SEMTECH CORP.
11
652 MITCHELL ROAD NEWBURY PARK CA 91320
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet SC1408IS.TR.PDF ] | |
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