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 (1) U.S. Patent No. 7,714,547 • 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 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 SC493ULTRT 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 Eval Board 16 BST Package 17 FB SDA Part Number 18 DH Ordering Information 19 VIN • Other embedded applications VOUT 20 EN • Networking and communications equipment • Office automation equipment • Power supply modules A0 High-current, distributed main power supply rails in: AGND Pin Configuration Applications Semtech and the Semtech logo are registered trademarks and EcoSpeed™ and SmartDrive™ are trademarks 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. ©2010 Semtech Corporation. All rights reserved. W W W .SE MTE C H .C OM -2SC493-PB-0610