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PDF SC1162 Data sheet ( Hoja de datos )
| Número de pieza | SC1162 | |
| Descripción | PROGRAMMABLE SYNCHRONOUS DC/DC CONVERTER WITH LOW DROPOUT REGULATOR CONTROLLER | |
| Fabricantes | Semtech Corporation | |
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October 25, 1999
PROGRAMMABLE SYNCHRONOUS DC/DC
CONVERTER WITH LOW DROPOUT
REGULATOR CONTROLLER
SC1162/3
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC1162/3 combines a synchronous voltage mode
controller with a low-dropout linear regulator providing
most of the circuitry necessary to implement two DC/
DC converters for powering advanced microprocessors
such as Pentium® II.
The SC1162/3 switching section features an integrated
5 bit D/A converter, pulse by pulse current limiting,
integrated power good signaling, and logic compatible
shutdown. The SC1162/3 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 components.
The SC1162/3 linear section is a high performance
positive voltage regulator design for either the GTL bus
supply at 1.5V (SC1162) or an adjustable output
(SC1163).
The output of the linear regulator can provide up to 5A
or more with the appropriate external MOSFET.
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® II requirements
• 1.5V or Adj. @ 1% for linear section
• 1.300V-2.05V ±1.5%; 2.100V-3.500V ±2%
APPLICATIONS
• Pentium® ll or Deschutes microprocessor supplies
• Flexible motherboards
• 1.3V to 3.5V microprocessor supplies
• Programmable dual power supplies
ORDERING INFORMATION
Part Number(1) Package
Linear
Voltage
SC1162CSW SO-24 1.5V
Temp.
Range (TJ)
0° to 125°C
SC1163CSW SO-24
Adj. 0° to 125°C
Note:
(1) Add suffix ‘TR’ for tape and reel.
PIN CONFIGURATION
BLOCK DIAGRAM
Top View
(24 Pin SOIC)
VCC CS- CS+
EN
VID4
VID3
VID2
VID1
VID0
1.25 REF
VCC
D/A &
SHUT-
DOWN
LOGIC
CURRENT LIMIT
70mV
OSCILLATOR
R
Q
S
BSTH
LEVEL SHIFT
AND HIGH SIDE
MOSFET DRIVE
DH
PGNDH
VOSENSE
PWRGOOD
OPEN
COLLECTORS
VCC
ERROR
AMP
OVP
AGND
1.265V
REF
SHOOT-
THRU
CONTROL
SYNCHRONOUS
MOSFET DRIVER
BSTL
DL
FET
CONTROLLER
PGNDL
LDOV
GATE LDOS
© 1999 SEMTECH CORP.
Pentium is a registered trademark of Intel Corporation
1
652 MITCHELL ROAD NEWBURY PARK CA 91320
1 page  
October 25, 1999
APPLICATION CIRCUIT
PROGRAMMABLE SYNCHRONOUS DC/DC
CONVERTER WITH LOW DROPOUT
REGULATOR CONTROLLER
SC1162/3
© 1999 SEMTECH CORP.
5
652 MITCHELL ROAD NEWBURY PARK CA 91320
5 Page 
October 25, 1999
PROGRAMMABLE SYNCHRONOUS DC/DC
CONVERTER WITH LOW DROPOUT
REGULATOR CONTROLLER
SC1162/3
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 conduc-
tion at the beginning and end of the bottom switch con-
duction 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 deter-
mined by:
INPUT CAPACITORS - since the RMS ripple current in
the input capacitors may be as high as 50% of the out-
put 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.
PCOND
=
I
2
O
⋅ RDS (on) ⋅ (1 − δ )
For the example above:
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 sur-
face 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 de-
tailed below:
Temperature rise (oC)
FET type Top FET
BUK556H 49.6(1)
Bottom FET
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 posi-
tion, power dissipation will be approximately halved and
temperature rise reduced by a factor of 4.
© 1999 SEMTECH CORP.
11
652 MITCHELL ROAD NEWBURY PARK CA 91320
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet SC1162.PDF ] | |
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