Download SC493 Product Brief

Product Brief
SEMTECH
POWER
MANAGEMENT
Digitally Controlled EcoSpeed® DC-DC Converter
Flexible, High-Performance Solution for Complex
Power Management Requirements
PWM controller with I2C interface provides ultra-fast transient response and
high efficiency with the flexibility of digital control.
Description
The SC493 combines Semtech’s patented(1) EcoSpeed®
adaptive on-time (AOT) controller core with I2C configuration
and diagnostics functions delivering the benefits of highperformance analog and the flexibility of digital control.
Pure analog controllers can provide high performance, but
lack flexibility. Some controllers offer digital flexibility using
fully digital topologies that require high-speed ADCs and
power-hungry DSPs. The SC493 wraps Semtech’s best-inclass, EcoSpeed AOT core with a digital interface to deliver
ultra-fast transient response, high efficiency across light to
full power loads and the flexibility of digital control.
The SC493 does not require external compensation
components and works with any type of output capacitor,
providing a simple, flexible, space-saving and cost-effective
power management solution.
SC493 – EcoSpeed PWM Controller with I2C Interface
EcoSpeed
Adaptive On-time (AOT) Core
EFFICIENCY
• Very high efficiency across entire
load range
I2C Control
Power Stage
• Ultra-fast transient response
• No external compensation
Control Loop
components required
• Ultra-thin, 20-pad MLPQ package:
3.0 x 3.0 x 0.6mm
FREQUENCY
• Programmable switching
frequency: 250kHZ to 1MHz
• Output Voltage
– Offset
– Margining
• Control
SPEED
SIZE
CONFIGURATION
Configuration
& Status
S C 493
SC493
– Enable/Disable
– Power-on delay
– Soft-start time
• Operating Modes
– Switching frequency
– Power-save mode
– Ultrasonic power-save
frequency
STATUS
• Operating Mode
– Power save
• Status
– Power good
• Fault Conditions
–
–
–
–
–
–
Over current
Over temperature
Over voltage
Under voltage
Brown out
Did not start
(1) U.S. Patent No. 7,714,547
W W W .SE MTE C H .C OM
Product Brief
Digital Voltage Margining
Digital Output Voltage Offset Configuration
Many designers enhance system reliability by conducting
voltage margining during the final test phase of product
manufacture. Margining is achieved by raising and lowering
the supply voltages to stress test the system. The SC493
enables users to digitally control margining up to ±10% from
nominal.
The SC493 features a separate configuration function allowing
users to fine-tune the output voltage in increments of 0.75%
from nominal, up to a maximum of ±9%. This offset can be
combined with the voltage margining for even greater offsets.
SC493 Features Overview
Typical Application Circuit
• I2C configuration control and status monitoring
• Patented adaptive on-time control architecture
­ - Ultra-fast transient response
­ - Pseudo-fixed switching frequency typically ±15% accuracy
­ - Programmable switching frequency: 250kHz to 1MHz
­ - Very high efficiency across the entire load range
­ - No external compensation components required
• Selectable auto power-save (PSAVE)
­ - Programmable ultrasonic PSAVE (UPSAVE)
> Eliminates audible noise during standby
> Provides programmable floor frequency
­ - Regular PSAVE
> Provides up to 95% peak efficiency during light loads
• Very wide VIN range: 3V to 28V
• VOUT range: 0.5V to 5V
• Gate drive to FETs capable of supporting 25A loads
• Fully protected
• SmartDrive™ technology reduces EMI
• Ultra-thin, 20-pad MLPQ package – 3.0 x 3.0 x 0.6 mm
3.3V or 5V
3V to 28V
VDD
3 to 28V
BST
DH
VIN
VOUT = 0.5V to 5V
VOUT
Chip Enable
LX
EN
ILIM
I2C VDD
SC493
DL
SCL
FB
SDA
PGOOD
VOUT
Power Good
(open drain)
A2
A1
A0
AGND
PGND
MLPQ-UT-20 (3 x 3 x 0.6 mm)
SC493EVB
A1
A2
ILIM
1
TOP VIEW
15
PGOOD
14
PVDD
2
AVDD
3
13
PGND
4
12
DL
11
NC
SCL
PAD
5
6
7
8
9
10
LX
SC493ULTRT
16
BST
Eval Board
17
DH
Package
18
FB
SDA
Part Number
19
VIN
Ordering Information
VOUT
20
EN
• Networking and communications equipment
• Office automation equipment
• Power supply modules
• Other embedded applications
A0
High-current, distributed main power supply rails in:
AGND
Pin Configuration
Applications
Semtech, the Semtech logo and EcoSpeed are registered marks of Semtech Corporation and SmartDrive™ is a trademark of Semtech Corporation. Semtech reserves the right to make changes to, or discontinue
any products described in this document without further notice. Semtech makes no warranty, representation or guarantee, express or implied, regarding the suitability of its products for any particular purpose.
I2C and the I2C bus are trademarks of NXP B.V. ©2011 Semtech Corporation. All rights reserved. SC493-PB-0411
W W W .SE MTE C H .C OM
-2-
Similar pages