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PDF SC493 Data sheet ( Hoja de datos )
| Número de pieza | SC493 | |
| Descripción | EcoSpeed Step-down Controller | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC493 (archivo pdf) en la parte inferior de esta página. Total 28 Páginas | ||
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POWER MANAGEMENT
SC493
EcoSpeedTM Step-down Controller
with I2C Interface
Features
Input supply voltage range — 3.0V to 28V
Controller supply voltage range — 3.0V to 5.5V
All ceramic solution enabled
I2C interface
Output voltage fine adjust control
Output voltage margining
Supports dynamic voltage transitions via the I2C
interface
Programmable power-on delay time and soft-start time
EcoSpeedTM architecture with pseudo fixed-frequency
adaptive on-time control
Switching frequency programmable up to 1MHz
Selectable power save, including ultrasonic
Non-synchronous start-up into pre-biased loads
Over-voltage/under-voltage fault protection
Smart power save
Power good Output
Smart driveTM
Status register monitoring device operation
Ultra-thin package — 3 x 3 x 0.6 (mm), 20 pin MLPQ-UT
Lead-free and halogen-free
WEEE and RoHS compliant
Description
The SC493 is a synchronous EcoSpeedTM buck power supply
controller. It features an I2C interface and a bootstrap switch in
a space-saving MLPQ 3X3-20 pin package. The SC493 uses
Semtech’s advanced patented adaptive on-time control archi-
tecture to provide excellent light load efficiency and fast tran-
sient response with small external components.
The I2C interface is used to program the output voltage
offset, the power-on delay time, the soft-start time, the
power save operating mode, and it can enable/disable the
controller. Additionally, a status register provides informa-
tion on device state and faults.
The controller is capable of operating with all ceramic solu-
tions and switching frequencies up to 1MHz. The program-
mable frequency and selectable power save mode offer the
flexibility to optimize the controller for high efficiency and
small size.The power save mode can be enabled to maximize
efficiency over the entire load range (PSAVE), or switched to
ultrasonic mode to set the minimum frequency to the desired
value (UPSAVE). Power save mode can be disabled for opera-
tion in continuous conduction mode at all loads.
Applications
Printers
Computer peripherals
Typical Application Circuit
Additional features include output voltage margining,
cycle-by-cycle current limit, output voltage soft-start, over
and under-voltage protection, controller over-tempera-
ture protection, and output voltage soft-shutdown when
disabled. The SC493 also provides a power good output.
VDD
VIN
Q1 CIN
R1 R2 R3
EN
PGD
SCL
SDA
EN
PGD
SCL
SDA
A0
A1
A2
SC493
BST
LX
DL
RILIM
CBST
L
VOUT
R4
Q2
COUT
R5
June 10, 2010
© 2010 Semtech Corporation
US Patent: 7,714,547 B2
1 page  
SC493
Electrical Characteristics (continued)
Parameter
Symbol
Condition
Min Typ Max Units
Digital Input Electrical Specifications (A0, A1, A2, EN)
Input High Threshold
VIH
VVDD(1) = 5.5V
1.6
V
Input Low Threshold
VIL VVDD(1) = 3.0V
0.4 V
Input High Current
IIH
VVDD(1) = 5.5V
-1 +1 μA
Input Low Current
IIL
VVDD(1) = 5.5V
-1 +1
I2C Interface
Interface complies with slave mode I2C interface as described by Philips I2C specifications version 2.1 dated January, 2000
μA
Digital Input Voltage Low
Digital Input Voltage High
SDA Output Low Level
Digital Input Current
Hysteresis of Schmitt Trigger Inputs
Maximum Glitch Pulse
Rejection
VB-IL
VB-IH
VSDA_LOW
IB-IN
VHYS
tSP
IDN(SDA) ≤ 3mA
0.4 V
1.6 V
0.4 V
-0.2 +0.2 μA
0.1 V
50 ns
I/O Pin Capacitance
CIN
10 pF
I2C Timing
Clock Frequency
SCL Low Period (2)
SCL High Period (2)
Data Hold Time (2)
Data Setup Time (2)
Setup Time for Repeated START
Condition (2)
Hold Time for Repeated START
Condition (2)
fSCL
tLOW
tHIGH
tHD_DAT
tSU_DAT
tSU_STA
tHD_STA
400 440 kHz
1300
ns
600 ns
0 ns
100 ns
600 ns
600 ns
Setup Time for STOP Condition (2)
Bus-Free Time Between STOP and START
(2)
tSU_STO
tBUF
600
1300
ns
ns
5 Page 
SC493
Block Diagram
VIN EN
76
SCL SDA A2 A1 A0
5 4 17 18 19
PGOOD PVDD
15 14
Reference
Control, Status, and I2C Interface
Feedback Adjustment
Output Voltage Margining
Power On Delay
Soft Start Time
Frequency Setting
Current Limit Setting
Power Save Mode
Status Register
Soft Start &
Slew Control
AVDD 3
AVDD
AGND 20
+
-
Comparator
On-time
Generator
FB 2
Gate Drive
Control
Zero Cross Detector
Valley Current Limit
PVDD
1
VOUT
PVDD
DL
9 BST
8 DH
10 LX
12 DL
16 ILIM
13 PGND
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet SC493.PDF ] | |
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