SI8250 Datasheet, PDF (1/30 Pages) Silicon Laboratories – DIGITAL POWER CONTROLLER

Si8250/1/2
DIGITAL POWER CONTROLLER
Features
Single-Chip, Flash-based digital
power controller
Supports isolated and non-isolated
applications
Enables new system capabilities
such as:
- Adaptive dead-time control for
higher efficiency
- Nonlinear control for faster
transient response
- Self diagnostics for higher
reliability
- Full PMBus command set
implementation for system
connectivity
Highly integrated control solution:
High-speed digital hardware
control loop
In-system programmable
supervisory processor
Programmable system protection
functions
Hardware cycle-by-cycle current
limiting and OCP
External clock and frame
synchronization inputs
Performs system management
functions such as external power
supply sequencing and fan
control/monitoring
In-system Flash programmable
Flash can also be used as NV
memory for data storage
Low cost, comprehensive
development tool kit includes:
Graphical, easy-to-use system
design tools
Integrated development
environment
In-system, on-line debugger
Turnkey isolated 35 W digital
half-bridge target board
Typical Applications
Isolated and non-isolated DC/DC
converters
AC/DC converters
Fully Pb-free and ROHS compliant
packages
32-pin LQFP
28-pin 5 x 5 mm QFN
Temp Range: –40 to +125 ºC
Description
Si8250/1/2 provides all control and protection functions necessary to implement
highly intelligent, fast response power delivery and management control systems
for isolated and non-isolated power supplies. On-board processing capability
enables intelligent control optimization for improved system performance and new
capabilities such as serial connectivity via the PMBus or on-board UART. The
Si8250/1/2 family is in-system Flash programmable enabling control and
protection parameters such as system regulation and protection settings, start-up
and shutdown modes, loop response, and modulation timing to be readily
modified. The built-in high-speed control path provides loop updates every 100nS
and provides pulse-by-pulse current limiting and over-current protection even
while the internal CPU is disabled.
The Si825x family is supported by the Si8250DK development kit, which contains
everything required to develop and program power supply applications with the
Si825x family of digital controllers.
Pin Assignments:
See page 23
32-pin LQFP
RST/C2CK 1
IPK 2
VSENSE 3
GNDA 4
VDDA 5
VREF 6
P1.0/VIN/AIN0 7
P1.1/AIN1 8
Si8250/1/2
Top View
24 P0.0
23 P0.1
22 P0.2
21 P0.3 / XCLK
20 P0.4
19 P0.5
18 P0.6
17 P0.7
28-pin QFN
GND
RST / C2CK 1
IPK 2
VSENSE 3
GND 4
VDD 5
VREF 6
P1.0/VIN/AIN0 7
Si8250/1/2
Top View
GND
21 P0.1
20 P0.2
19 P0.3/XCLK
18 P0.4
17 P0.5
16 P0.6
15 P0.7
Patents pending
Preliminary Rev. 0.8 3/06
Copyright © 2006 by Silicon Laboratories
Si8250/1/2
This information applies to a product under development. Its characteristics and specifications are subject to change without notice.