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PDF SC1155EVB Data sheet ( Hoja de datos )
| Número de pieza | SC1155EVB | |
| Descripción | PROGRAMMABLE SYNCHRONOUS DC/DC HYSTERETIC CONTROLLER WITH VRM 9.0 VID RANGE | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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PROGRAMMABLE SYNCHRONOUS
DC/DC HYSTERETIC CONTROLLER
WITH VRM 9.0 VID RANGE
SC1155
PRELIMINARY - August 7, 2000
DESCRIPTION
The SC1155 is a synchronous-buck switch-mode con-
troller designed for use in single ended power supply
applications where efficiency is the primary concern.
The controller is a hysteretic type, with a user se-
lectable hysteresis. The SC1155 is ideal for implement-
ing DC/DC converters needed to power advanced mi-
croprocessors such as Pentium® llI and Athlon®, in both
single and multiple processor configurations. Inhibit,
under-voltage lockout and soft-start functions are in-
cluded for controlled power-up.
SC1155 features include an integrated 5 bit D/A con-
verter, temperature compensated voltage reference,
current limit comparator, over-current protection, and
an adaptive deadtime circuit to prevent shoot-through
of the power MOSFET during switching transitions.
Power good signaling, logic compatible shutdown, and
over-voltage protection are also provided. The inte-
grated D/A converter provides programmability of out-
put voltage from 1.1V to 1.85V in 25mV increments.
The SC1155 high side driver can be configured as
either a grounded reference or as a floating bootstrap
driver. The high and low side MOSFET drivers have a
peak current rating of 2 amps.
TYPICAL APPLICATION CIRCUIT
FEATURES
•= Programmable hysteresis
•= 5 bit DAC programmable output (1.1V-1.85V)
•= On-chip power good and OVP functions
•= Designed to meet latest Intel specifications
•= Up to 95% efficiency
•= +1% voltage tolerance over temperature
APPLICATIONS
•= Server Systems and Workstations
•= Intel Pentium® III Core Supplies
•= AMD Athlon® Core Supplies
•= Multiple Microprocessor Supplies
•= Voltage Regulator Modules
ORDERING INFORMATION
DEVICE(1)
PACKAGE TEMP. RANGE (TJ)
SC1155CSW.TR SO-28
0 - 125°C
SC1155EVB
Evaluation Board
Note:
(1) Only available in tape and reel packaging. A reel
contains 1000 devices.
R1 R3
2k 2.7k
C2
0.01
R2
1k
R4
1k
C3
0.01
R5
100
C4 R6
0.01 20k
1 IOUT
U1
SC1155CSW
PWRGD
28
2 DROOP
VID0 27
3 OCP
VID1 26
4 VHYST
VID2 25
5 VREFB
C6
0.1 6 VSENSE
VID3 24
VID4 23
R9
10k
+5V
R10
10k
C5
0.001
C7
0.1
C8
0.01
+5V
7 AGND
8 SOFTST
9 N/C
10 LODRV
INHIBIT 22
IOUTLO 21
LOSENSE 20
HISENSE 19
C12
0.33
11 LOHIB
BOOTLO 18
R8
12 DRVGND
HIGHDR 17
R11
2.2
Q1
IRL3103S
10k
C13
13 LOWDR
BOOT 16
0.33
+12V
14 DRV
VIN12V 15
Q2
R12 IRL2203S
3.9
C8
2.2uF
C9
2.2uF
R7
150
PWRGD
INHIB
L1
1uH
C16
0.1
C17-C19
150uF/16V
Vin
C20
0.1 Vin +5 to +12V
GND
L2
1.5uH
Vout
C21-C26
150uF/4V
C27
0.1 Vout = 1.1 to 1.85V
GND
© 2000 SEMTECH CORP.
Athlon is a registered trademark of AMD Corporation
Pentium is a registered trademark of Intel Corporation
1
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
1 page  
PROGRAMMABLE SYNCHRONOUS
DC/DC HYSTERETIC CONTROLLER
WITH VRM 9.0 VID RANGE
SC1155
PRELIMINARY - August 7, 2000
ELECTRICAL CHARACTERISTICS (cont.)
Unless specified: 0 < TJ < 125°C, VIN = 12V
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
HYSTERETIC COMPARATOR
Input Offset Voltage
Input Bias Current
Hysteresis Accuracy
Hysteresis Setting
DROOP COMPENSATION
VosHYSCMP VDROOP pin grounded
IbiasHYSCMP
VHYS_ACC
VHYS_SET
5 mV
1 µA
7 mV
60 mV
Initial Accuracy
OVERCURRENT PROTECTION
VDROOP_ACC VDROOP = 50mV
5 mV
OCP Trip Point
Input Bias Current
HIGH-SIDE VDS SENSING
VOCP
IbiasOCP
0.09 0.1 0.11
100
V
nA
Gain
2 V/V
Initial Accuracy
IOUT Source
IOUT Sink Current
IOUT Voltage Swing
VIOUT Voltage Swing
VIOUT Voltage Swing
LOSENSE High Level Input Voltage
LOSENSE Low Level Input Voltage
Sample/Hold Resistance
BUFFERED REFERENCE
VIOUT_ACC VHISENSE = 12V, VIOUTLO = 11.9V
6
IsourceIOUT VIOUT = 0.5V, VHISENSE = 12V,
VIOUTLO = 11.5V
500
IsinkIOUT
VIOUT = 0.05V, VHISENSE = 12V,
VIOUTLO = 12V
40 50
VIOUT (IN)
VHISENSE = 11V,
RIOUT = 10k0hm
0 3.75
VIOUT(4,5V)
VHISENSE = 4.5V,
RIOUT = 10kOhm
0 2.0
VIOUT(3V) VHISENSE = 3V, RIOUT = 10kOhm
0
1.0
VihLOSENSE VHISENSE = 4.5V (Note 1)
2.85
VilLOSENSE VHISENSE = 4.5V (Note 1)
1.8
RS/H 4.5V ≤ = 13V
50 65 80
mV
µA
µA
V
V
V
V
V
Ω
VREFB Load Regulation
DEADTIME CIRCUIT
VldregREFB 10µA < IREFB < 500µA
2 mV
LOHIB High Level Voltage
LOHIB Low Level Input Voltage
LOWDR High Level Input Voltage
LOWDR Low Level Input Voltage
VihLOHIB
VilLOHIB
VihLOWDR
VilLOWDR
(Note 1)
(Note 1)
2V
1.0 V
2V
1.0 V
© 2000 SEMTECH CORP.
5
5 Page 
PRELIMINARY - August 7, 2000
BLOCK DIAGRAM
PROGRAMMABLE SYNCHRONOUS
DC/DC HYSTERETIC CONTROLLER
WITH VRM 9.0 VID RANGE
SC1155
© 2000 SEMTECH CORP.
11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet SC1155EVB.PDF ] | |
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