DataSheet.es    


PDF SC2655 Data sheet ( Hoja de datos )

Número de pieza SC2655
Descripción Programmable Synchronous DC/DC Hysteretic Controller
Fabricantes Semtech Corporation 
Logotipo Semtech Corporation Logotipo



Hay una vista previa y un enlace de descarga de SC2655 (archivo pdf) en la parte inferior de esta página.


Total 20 Páginas

No Preview Available ! SC2655 Hoja de datos, Descripción, Manual

SC2655
Programmable Synchronous DC/DC
Hysteretic Controller with VRM 9.0 VID Range
POWER MANAGEMENT
www.DataSheet4U.com
Description
Features
The SC2655 is a synchronous-buck switch-mode con-
troller designed for use in single ended power supply ap-
plications where efficiency is the primary concern. The
controller is a hysteretic type, with a user selectable hys-
teresis. The SC2655 is ideal for implementing DC/DC
converters needed to power advanced microprocessors
such as Pentium® llI and Athlon®, in both single and mul-
tiple processor configurations. Inhibit, under-voltage lock-
out and soft-start functions are included for controlled
power-up.
SC2655 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-volt-
age protection are also provided. The integrated D/A
converter provides programmability of output voltage
from 1.1V to 1.85V in 25mV increments.
‹ 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
‹ VIDs pulled up to +3.3V
Applications
‹ Server Systems and Workstations
‹ Pentium® III Core Supplies
‹ AMD Athlon® Core Supplies
‹ Multiple Microprocessor Supplies
‹ Voltage Regulator Modules
The SC2655 high side driver can be configured as either
a ground-referenced or as a floating bootstrap driver.
The high and low side MOSFET drivers have a peak cur-
rent rating of 2 amps.
Typical Application Circuit
+5V
R2
1k
R4
1k
R5
*
R6
20k
C2
0.001
R1
*
U1
SC2655
R3
* 1 IOUT
PWRGD 28
2 DROOP
VID0 27
3 OCP
VID1 26
4 VHYST
VID2 25
5 VREFB
C1
0.1 6 VSENSE
VID3 24
VID4 23
7 AGND
INHIBIT 22
R9
10k
R10
1k
R11
1k
PWRGD
"POWER GOOD"
C6
0.1
INHIB
"INHIBIT"
C7
0.1
L1
0.5uH
Cin
HF
Cin
Bulk
+5V
C4
0.01
C3
0.1
8 SOFTST
9 N/C
10 LODRV
11 LOHIB
12 DRVGND
13 LOWDR
14 DRV
C5
IOUTLO 21
LOSENSE 20
C8
0.033
HISENSE 19
BOOTLO 18
HIGHDR 17
Q1
FDB6035AL
R12
1.0
BOOT
VIN12V
16
+12V
15
C9
1.0
Q2
FDB7030BL
R14
1.6
C10
L2
1.0uH
Cout
Bulk
Cout
HF
+
Vin +5V/12V
_
+
1.10 to 1.825V
_
R7
R8 *
10k
*) for the values see specific application circuit somewhere else in the datasheet
Revision: December 10, 2003
1
www.semtech.com

1 page




SC2655 pdf
SC2655
POWER MANAGEMENT
DCwEwwle.DcattarSicheaetl4UC.chomaracteristics (Cont.)
Parameter
Symbol
Conditions
High-Side Output Driver (1)
Peak Output Current
IsrcHIGHDR duty cycle < 2%, tpw < 100µs,
Min Typ Max Units
2A
Equivalent Output Resistance
Low-Side Output Driver (1)
IsinkHIGHDR
RsrcHIGHDR
RsinkHIGHDR
TJ = 125°C
VBOOT - VBOOTLO = 6.5V, VHIGHDR = 1.5V (src)
or VHIGHDR = 5V (sink)
TJ = 125°C
VBOOT - VBOOTLO = 6.5V, VHIGHDR = 6V
TJ = 125°C
VBOOT - VBOOTLO = 6.5V, VHIGHDR = 0.5V
Peak Output Current
IsrcLOWDR
IsinkLOWDR
Equivalent Output Resistance RsrcLOWDR
RsinkLOWDR
AC Electrical Characteristics
duty cycle < 2%, tpw < 100us,
TJ = 125°C
VDRV - VBOOTLO = 6.5V, VLOWDR = 1.5V (src)
or VLOWDR = 5V (sink)
TJ = 125°C
VDRV = 6.5V, VLOWDR = 6V
TJ = 125°C
VDRV = 6.5V, VLOWDR = 0.5V
(Note 1)
Hysteretic Comparators
Propagation Delay Time from
VSENSE to HIGHDR or
LOWDR (excluding
deadtime)
Output Drivers
HIGHDR rise/fall time
LOWDR rise/falltime
Overcurrent Protection
Comparator Propagation
Delay Time
Deglitch Time (Includes
comparator propagation
delay time)
tHCPROP
10mV overdrive,
1.3V Vref 1.8V
trHIGHDR
trHIGHDR
trLOWDR
tfLOWDR
CI = 9nF, VBOOT = 6.5V,
VBOOTLO = grounded,
TJ =125°C
CI = 9nF, VDRV = 6.5V,
TJ =125°C
tOVPROP
tOVDGL
2
2
45
5
45
5
150 250
60
60
1
5
ns
ns
ns
µs
µs
2003 Semtech Corp.
5
www.semtech.com

5 Page





SC2655 arduino
SC2655
POWER MANAGEMENT
Outwpwuw.tDaVtaoSlhteaetg4Ue.coTmable
0 = VSS; 1 = OPEN
VID4
VID3
VID2
VID1
VIDO
VDC
(V)
1 1 1 1 1 Output Off
1 1 1 1 0 1.1
1 1 1 0 1 1.125
1 1 1 0 0 1.15
1 1 0 1 1 1.175
1 1 0 1 0 1.2
1 1 0 0 1 1.225
1 1 0 0 0 1.250
1 0 1 1 1 1.275
1 0 1 1 0 1.3
10
10
1 1.325
10
10
0 1.35
1 0 0 1 1 1.375
1 0 0 1 0 1.4
1 0 0 0 1 1.425
1 0 0 0 0 1.45
0 1 1 1 1 1.475
0 1 1 1 0 1.5
0 1 1 0 1 1.525
0 1 1 0 0 1.55
0 1 0 1 1 1.575
0 1 0 1 0 1.6
0 1 0 0 1 1.625
0 1 0 0 1 1.65
0 0 1 1 1 1.675
0 0 1 1 0 1.7
0 0 1 0 1 1.725
0 0 1 0 0 1.75
0 0 0 1 1 1.775
0 0 0 1 0 1.8
0 0 0 0 1 1.825
0 0 0 0 0 1.85
NOTE:
(1) If the VID bits are set to 11111, then the high-side and the low-side driver outputs will be set low, and the
controller will be set to a low-Iq state.
2003 Semtech Corp.
11
www.semtech.com

11 Page







PáginasTotal 20 Páginas
PDF Descargar[ Datasheet SC2655.PDF ]




Hoja de datos destacado

Número de piezaDescripciónFabricantes
SC265(SC2xx) Thyristors / TRIACSemitronics
Semitronics
SC2655Programmable Synchronous DC/DC Hysteretic ControllerSemtech Corporation
Semtech Corporation

Número de piezaDescripciónFabricantes
SLA6805M

High Voltage 3 phase Motor Driver IC.

Sanken
Sanken
SDC1742

12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters.

Analog Devices
Analog Devices


DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares,
permitiéndote verlos en linea o descargarlos en PDF.


DataSheet.es    |   2020   |  Privacy Policy  |  Contacto  |  Buscar