|
|
PDF SC453 Data sheet ( Hoja de datos )
| Número de pieza | SC453 | |
| Descripción | VID Programmed Single Phase Power Supply Controller | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de SC453 (archivo pdf) en la parte inferior de esta página. Total 23 Páginas | ||
|
No Preview Available !
POWER MANAGEMENT
Description
The SC453 IC is a single chip high-performance Hysteretic
PWM controller. With its integrated SmartDriver™, it pow-
ers advanced graphics and core processors. It provides
sleep mode and boot voltage support. Automatic "power-
save" is present to prevent negative current flow in the
low-side FET during light loading conditions saving even
more power. The high side driver initially turns on with a
weak drive to reduce ringing, EMI, and capacitive turn-on
of the low side.
www.DataSheet4U.com
A 6-bit DAC, accurate to 0.85%, sets the output voltage
reference, and implements the 0.700V to 1.708V range
required by the processor. The hysteretic converter uses a
comparator without an error amplifier, and therefore pro-
vides the fastest possible transient response, while avoid-
ing the stability issues inherent to classical PWM control-
lers. The DAC is externally slew rate limited to minimize
transient currents and audible noise.
SC453
Portable, VID Programmed Single
Phase Power Supply Controller
Features
High Speed Hysteretic Controller
Single Phase Operation
Selectable Analog or VID Controlled Sleep Setting
6 Bit VID programmable Output
Integrated Drivers with Soft-High Side Turn-On
Programmable Soft-Start
Programmable Boot Voltage
Programmable Sleep Voltage with Sleep Mode
Under-Voltage Lockout on VCCA
Over-voltage Protection on CORE
Current Limit Protection on CORE
Thermal Protection
Power Good Flag with Blanking During
VCORE Changes
Automatic Power Save at Light Load
TSSOP-28 Package
The SC453 operates from 5VDC and also features soft-
start, an open-drain PWRGD signal with power good blank-
ing, and an enable input. Programmable current limiting
shuts down the SC453 after 32 current limit pulses.
Applications
Low Power Notebook and Laptop Computers
Embedded Applications
PowerStep IV™ and Smart Driver™ are trademarks
of Semtech Corporation.
Typical Application Circuit
VCCA
V5
VIN
Smart
Driver
VCORE
0.700V-1.708V
SC453 Single Phase
Power Supply
PWM
Controller
VID (5:0)
August 25, 2006
VID Logic
and DAC
1
www.semtech.com
1 page  
SC453
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Parameter
Symbol
Conditions
Soft-Start & DAC Slew (SS)
Soft-Start/DAC
Slew Current
Note:
www.DataSSuhneSteilct4EaUpN.cisogmoneost
discharged
low or
UVLO cuts in. To enable
the converter, SS has to
drop below VSS_EN.
Soft-Start
Enable Threshold
DAC (VID [5:0])
VID Input Threshold
ISS
VSS_EN
ViH_VID
ViL_VID
DAC Output
Voltage Accuracy
VDAC_ERR
Boot Voltage (BOOTV)
Input Voltage Offset
BOOT Delay Time(1)
VBOOTV-
VDAC
TBOOT
Discharge (sink) Current
Soft-Start transition 0 < TA < 85°C,
- 40 < TA < 85° C
Sleep Exit, 0 < TA < 85°C
Sleep Exit, -40 < TA < 85°C
VID Transition, 0 < TA < 85°C
VID Transition, -40 < TA < 85°C
0° < TA < 85°C, VID [5:0] = 000000
"111111(1.708V" 0.812V)
-25°C < TA < 85°C, VID [5:0] = 000000
"111111 (1.708V" 0.700V)
BOOTV = 1.2V
Sleep (SLP, SLPV)
Input Voltage Offset
SLP Logic Threshold
VSLPV-VDAC
ViH_SLP
ViL_SLP
CORE Comparator (CMP, REFIN, HYS)
Input Bias Current
Input Voltage Offset
IREFIN
VCMP -
VREFIN
SLPV = 0.8V
VREFIN = 1.3V
Min
5
7.5
204
180
102
90
0.55
-0.85
-2.0
10
2
Typ Max Units
10 mA
10.5 16
256 310
240 320
128 155
120 160
μA
40 100 mV
0.45
+0.85
+2.0
V
%
%
|±3| %
35 μs
|±3| %
V
0.8
|±1.5|
|±2|
|±3|
μA
mV
© 2006 Semtech Corp.
5
www.semtech.com
5 Page 
SC453
POWER MANAGEMENT
Applications Information (Cont.)
SUPPLY, BIAS, UVLO, POWER GOOD GENERATOR
Supply
The chip is optimized to operate from a 5V ± 5% rail but
also designed to work up to 6V maximum supply voltage.
Under-Voltage Lock-Out Circuit
The Under-Voltage Lock-Out Circuit consists of compara-
tors which monitor the VCCA and V5 voltage levels. The
w w w . D aSt Ca 4S5h 3e e tis4 Uin. c oUmVLO mode while either supply has not
ramped above the upper threshold or has dropped below
the lower threshold. During UVLO, the external FETs are
held off, tri-stating the output (DRN).
Over-Voltage Protection
If the CORE voltage is greater than +14% of the DAC (i.e.,
out of the power good window), the SC453 will latch off
and hold the low-side driver on permanently. Either the
power or EN must be recycled to clear the latch. The latch
is disabled during soft-start and VID/Sleep transitions.
For safety, the latch is enabled if the CORE voltage ex-
ceeds 2V even during VID/Sleep transitions.
Thermal Shutdown
The device will be disabled and latched off when the inter-
nal junction temperature reaches approximately 160°C.
Either the power or EN must be recycled to clear the
latch.
Band Gap Reference
A ± 0.85% precision Band Gap reference acts as the in-
ternal reference voltage standard of the chip, which all
critical biasing voltages and currents are derived from. All
references to VREF in the equations to follow will assume
VREF = 1.7V.
Precision DAC
This 6-bit digital-to-analog converter (DAC) serves as the
programmable reference source of the Core Comparator.
Programming is accomplished by logic voltage levels ap-
plied to the DAC inputs. The VID code vs. the DAC output
is shown in the following table. The accuracy of the VID
/DAC is maintained on the same level as the Band Gap
reference.
VID
54 32 10
000000
00000 1
0000 10
0000 11
000 100
000 10 1
000 110
000 111
00 1000
00 100 1
00 10 10
00 10 11
00 1100
00 110 1
00 1110
00 1111
0 10000
0 1000 1
0 100 10
0 100 11
0 10 100
0 10 10 1
0 10 110
0 10 111
0 11000
0 1100 1
0 110 10
0 110 11
0 11100
0 1110 1
0 11110
0 11111
VDAC
V
1.708
1.692
1.676
1.660
1.644
1.628
1.612
1.596
1.580
1.564
1.548
1.532
1.516
1.500
1.484
1.468
1.452
1.436
1.420
1.404
1.388
1.372
1.356
1.340
1.324
1.308
1.292
1.276
1.260
1.244
1.228
1.212
VID
54 3 2 10
10 0 0 0 0
10000 1
100 0 10
1000 11
100 100
100 10 1
100 110
100 111
10 1000
10 100 1
10 10 10
10 10 11
10 1100
10 110 1
10 1110
10 1111
1 10 00 0
1 10 00 1
1 10 0 10
1 10 0 1 1
1 10 10 0
1 10 10 1
1 10 1 10
1 10 1 1 1
1 1 10 0 0
11100 1
1 110 10
1110 11
1 11100
1 1110 1
1 11110
111111
VDAC
V
1.196
1.180
1.164
1.148
1.132
1.116
1.100
1.084
1.068
1.052
1.036
1.020
1.004
0.988
0.972
0.956
0.940
0.924
0.908
0.892
0.876
0.860
0.844
0.828
0.812
0.796
0.780
0.764
0.748
0.732
0.716
0.700
© 2006 Semtech Corp.
11
www.semtech.com
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet SC453.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| SC450 | Dual Phase Power Supply Controller | Semtech Corporation |
| SC4501 | 2MHz Step-Up Switching Regulator | Semtech Corporation |
| SC4502 | 2MHz Step-Up Switching Regulator | Semtech Corporation |
| SC4502H | 2MHz Step-Up Switching Regulator | Semtech Corporation |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 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, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |