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PDF SC1183 Data sheet ( Hoja de datos )
| Número de pieza | SC1183 | |
| Descripción | PROGRAMMABLE SYNCHRONOUS DC/DC CONVERTER/ DUAL LOW DROPOUT REGULATOR CONTROLLER | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC1183 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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August 25, 1998
PROGRAMMABLE SYNCHRONOUS DC/DC
CONVERTER, DUAL LOW DROPOUT
REGULATOR CONTROLLER
SC1182/3
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC1182/3 combines a synchronous voltage mode
controller with two low-dropout linear regulators
providing most of the circuitry necessary to implement
three DC/DC converters for powering advanced
microprocessors such as Pentium® II (Klamath) or
Deschutes.
The SC1182/3 switching section features an integrat-
ed 5 bit D/A converter, pulse by pulse current limiting,
integrated power good signaling, and logic compatible
shutdown. The SC1182/3 switching section operates
at a fixed frequency of 200kHz, providing an optimum
compromise between size, efficiency and cost in the
intended application areas. The integrated D/A con-
verter provides programmability of output voltage
from 2.0V to 3.5V in 100mV increments and 1.30V to
2.05V in 50mV increments with no external compo-
nents.
The SC1182/3 linear sections are low dropout regula-
tors. The SC1182 supplies 1.5V for GTL bus and 2.5V
for non-GTL I/O.
For the SC1183 both LDO’s are adjustable.
FEATURES
• Synchronous design, enables no heatsink solution
• 95% efficiency (switching section)
• 5 bit DAC for output programmability
• On chip power good function
• Designed for Intel Pentium® ll VRM8.1 require-
ments
• 1.5V, 2.5V or Adj. @ 1% for linear section
APPLICATIONS
• Pentium® ll or Deschutes microprocessor supplies
• Flexible motherboards
• 1.3V to 3.5V microprocessor supplies
• Programmable triple power supplies
ORDERING INFORMATION
Part Number(1) Package
Linear
Voltage
Temp.
Range (TJ)
SC1182CSW SO-24 1.5V/2.5V 0° to 125°C
SC1183CSW SO-24
Adj. 0° to 125°C
Note:
(1) Add suffix ‘TR’ for tape and reel.
PIN CONFIGURATION
BLOCK DIAGRAM
Top View
AGND
GATE1
LDOS1
LDOS2
VCC
OVP
PWRGOOD
CS-
CS+
PGNDH
DH
PGNDL
1
2
3
4
5
6
7
8
9
10
11
12
24 GATE2
23 LDOV
22 VID0
21 VID1
20 VID2
19 VID3
18 VID4
17 VOSENSE
16 EN
15 BSTH
14 BSTL
13 DL
(24 Pin SOIC)
© 1998 SEMTECH CORP.
REF.
FET
CONTROLLE R
2.5V/ADJ.
1.265V
REF.
LDOV
FET
CONTROLLE R
1.5V/ADJ.
Pentium is a registered trademark of Intel Corporation
1
652 MITCHELL ROAD NEWBURY PARK CA 91320
1 page  
August 25, 1998
APPLICATION CIRCUIT
PROGRAMMABLE SYNCHRONOUS DC/DC
CONVERTER, DUAL LOW DROPOUT
REGULATOR CONTROLLER
SC1182/3
© 1998 SEMTECH CORP.
5
652 MITCHELL ROAD NEWBURY PARK CA 91320
5 Page 
August 25, 1998
PROGRAMMABLE SYNCHRONOUS DC/DC
CONVERTER, DUAL LOW DROPOUT
REGULATOR CONTROLLER
SC1182/3
FET type RDS(on) (mΩ) PD (W) Package
BUK556H 22
IRL2203 7.0
2.48
0.79
TO220
D2PAK
Si4410 13.5
1.53 SO-8
BOTTOM FET - Bottom FET losses are almost entirely
due to conduction. The body diode is forced into con-
duction at the beginning and end of the bottom switch
conduction period, so when the FET turns on and off,
there is very little voltage across it, resulting in low
switching losses. Conduction losses for the FET can be
determined by:
PCOND = I2O ⋅ R DS (on ) ⋅ (1 − δ)
For the example above:
INPUT CAPACITORS - since the RMS ripple current
in the input capacitors may be as high as 50% of the
output current, suitable capacitors must be chosen ac-
cordingly. Also, during fast load transients, there may
be restrictions on input di/dt. These restrictions require
useable energy storage within the converter circuitry,
either as extra output capacitance or, more usually,
additional input capacitors. Choosing low ESR input
capacitors will help maximize ripple rating for a given
size.
FET type
BUK556H
IRL2203
Si4410
RDS(on) (mΩ) PD (W)
22 1.95
7.0 0.62
13.5 1.20
Package
TO220
D2PAK
SO-8
Each of the package types has a characteristic thermal
impedance, for the TO-220 package, thermal
impedance is mostly determined by the heatsink used.
For the surface mount packages on double sided FR4, 2
oz printed circuit board material, thermal impedances of
40oC/W for the D2PAK and 80oC/W for the SO-8 are
readily achievable. The corresponding temperature rise
is detailed below:
Temperature rise (oC)
FET type Top FET Bottom FET
BUK556H 49.6(1)
39.0(1)
IRL2203 31.6
24.8
Si4410 122.4
96
(1) With 20oC/W Heatsink
It is apparent that single SO-8 Si4410 are not adequate
for this application, but by using parallel pairs in each po-
sition, power dissipation will be approximately halved and
temperature rise reduced by a factor of 4.
© 1998 SEMTECH CORP.
11
652 MITCHELL ROAD NEWBURY PARK CA 91320
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet SC1183.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| SC1182 | PROGRAMMABLE SYNCHRONOUS DC/DC CONVERTER/ DUAL LOW DROPOUT REGULATOR CONTROLLER | Semtech Corporation |
| SC1182CSW | PROGRAMMABLE SYNCHRONOUS DC/DC CONVERTER/ DUAL LOW DROPOUT REGULATOR CONTROLLER | Semtech Corporation |
| SC1183 | PROGRAMMABLE SYNCHRONOUS DC/DC CONVERTER/ DUAL LOW DROPOUT REGULATOR CONTROLLER | Semtech Corporation |
| SC1183CSW | PROGRAMMABLE SYNCHRONOUS DC/DC CONVERTER/ DUAL LOW DROPOUT REGULATOR CONTROLLER | Semtech Corporation |
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