Si8250/1/2
Digital Power Controller
The Si825x family of programmable digital power controllers
provides closed-loop feedback control, system protection and
power management functions for switch mode power systems.
The novel Si825x architecture combines a dedicated DSP-based
control loop processor with an in-system programmable system
management processor. This architecture guarantees the control
loop is updated at 10 MHz, regardless of firmware size and
complexity for the fastest possible control response. Firmware can
change all control parameters on the fly (loop gain, compensation,
timing, etc.) enabling the system to quickly and intelligently adapt
to changing operating conditions, such as loading and unloading
transients. The Si825x family is supported by a low-cost
development kit, which includes a complete real-time firmware
kernel with intuitive design tools. Packaged in a tiny 5 x 5 mm 28-
pin QFN package or 32-pin LQFP, the Si825x family provides cost-
effective control solutions that offer greater levels of performance,
controllability, reliability, and flexibility than today's analog-based
designs.
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Programmable hardware over-current protection
16 or 32 kB of Flash
50 MIPS Flash System Management Processor
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Flash can be used as EEPROM
On-board 2% oscillator
Self-sequencing, 8-channel 12-bit ADC
Supports firmware-programmable safeguards (UVLO, OTP, OVP)
Individual hardware limit detectors with vectored interrupts
On-board temperature sensor and VREF
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High-speed, programmable general-purpose comparator
PMBus hardware interface (SMBus)
Enhanced UART for isolated control data link
Four 16-bit timers
3-Channel PCA for general-purpose timing or additional PWM outputs
High-current, fully-programmable I/O port lines
Minimizes learning curve and speeds time-to-market
Real-time firmware kernel greatly reduces firmware development
Intuitive compensator design tool
GUI-based waveform designer/simulator
System configuration wizards
Intuitive IDE with real-time debug
Single-Chip, Flash Digital Controller
Comprehensive, Low-cost Development Kit
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Supports isolated and non-isolated applications
Supports ac/dc, dc/dc and PFC applications
Enables new system capabilities
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Adaptive dead-time control
Nonlinear control response
Efficiency optimization
Self diagnostics/status reporting
Dedicated DSP-Based Loop Processor
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Standard and on-line debug modes
Everything included
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Fixed 10 MHz update rate (independent of firmware)
Differential input ADC
Loop filter DSP engine
Applications
DC/DC converters
AC/DC converters
PFC circuits
DC motor control
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PID + 2nd stage low-pass filter
Selectable discrete time or SINC 2nd stage low-pass filter
Less than 5 ns dithered resolution
Highly flexible DPWM with up to 6 output phases
Hardware pulse-by-pulse current limiting with programmable leading-
edge blanking
5 x 5 mm 28-pin QFN and 32-pin LQFP Packages
125 °C Maximum Operating Temperature
VDD
50MIPS 8051 CPU
PORT 0
SYSCLKIN
2% 25 MHz
OSC, and LFO
Reset Control
16/32 K
Flash
1280B
RAM
4x 16-bit
Timers
SMBus
3 CH PCA
I/O Port
Latches
UART
MUX
I/O (8)
DEBUG
PORT
Hardware
Debug
Interrupt
Control
PORT 1
VSENSE
I/O (8)
ADC
Registers &
Limit
Detectors
12-bit
200 Ksps
ADC
Auto
Sequencing
Logic
8
Temp
Sensor
VSENSE
VSENSE
VREF
DAC
10 MHz
ADC
DSP
Filter Engine
u(n)
VREF
VREF
IPK
Multiphase
DPWM
Pulse-by-Pulse
Current Limiter
and OCP
ICYC
OCP
Gate Control (6)
Si8250
Power
Copyright © 2005 by Silicon Laboratories
4.19.2005
Si8250/1/2
Digital Power Controller
Selected Electrical Specifications
(T
A
= –40 to +125 C°, V
DD
= 2.5 V unless otherwise specified)
Parameter
Global Characteristics
Supply Voltage
Supply Current
Conditions
Min
2.25
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—
—
—
5
—
—
—
—
—
—
Typ
—
25
200
0.1
22
10
—
15
—
—
200
—
—
Max
2.55
—
—
—
—
—
—
—
50
12
—
750
40
Units
V
mA
µA
µA
Bits
MHz
ns
ns
MIPS
Bits
ksps
ns
All peripherals enabled
VIN < V
UVLO
Stop mode
Loop Processor Specifications
DSP Data Path
Loop ADC Sampling Frequency
DPWM Resolution
Not dithered
IPK Sense to DPWM Output Delay
System Management Processor Specifications
Processor Throughput
Management ADC Resolution
Management ADC Sampling Frequency
Low power mode, 25 mV Overdrive
General Purpose Comparator
Response Time
High power mode, 25 mV Overdrive
Ordering Guide
Part Number
Si8250-IM
Si8250-IQ
Si8251-IM
Si8251-IQ
Si8252-IM
Si8252-IQ
Flash
32 K
32 K
16 K
16 K
16 K
16 K
DPWM Outputs
6Φ
6Φ
6Φ
6Φ
3Φ
3Φ
UART
Y
Y
Y
Y
N
N
Comparator
Y
Y
Y
Y
N
N
Package
QFN28
LQFP32
QFN28
LQFP32
QFN28
LQFP32
Temperature
–40 to 125 ºC
–40 to 125 ºC
–40 to 125 ºC
–40 to 125 ºC
–40 to 125 ºC
–40 to 125 ºC
Package Information (28-pin QFN)
Bottom View
L
7
Package Information (32-pin LQFP)
MAX
1.00
0.05
1.00
0.30
3.35
3.35
0.65
15
D2
D2
2
E2
R
16
17
6xe
E
18
19
20
DETAIL 1
28
27
26
25
24
23
22
21
6
5
4
e
b
2
1
E2
2
3
6xe
D
A
A1
A2
A3
b
D
D2
E
E2
e
L
N
ND
NE
R
AA
BB
CC
DD
MIN
0.80
0
0
0.18
2.90
2.90
0.45
MM
TYP
0.90
0.02
0.65
0.25
0.23
5.00
3.15
5.00
3.15
0.5
0.55
28
7
7
0.435
0.435
0.18
0.18
10
11
12
13
14
D
D1
A
MIN NOM MAX
(mm) (mm) (mm)
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1.60
0.15
8
9
A1 0.05
E1 E
A2 1.35 1.40 1.45
b
0.30 0.37 0.45
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-
9.00
7.00
0.80
9.00
7.00
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32
D
D1
1
0.09
PIN 1
IDENTIFIER
A2
e
A
b
BB
E
E1
Side View
A2
A
DETAIL 1
AA
A1
e
A3
A1
e
Power
Copyright © 2005 by Silicon Laboratories
DD
CC
4.19.2005
Silicon Laboratories and Silicon Labs are trademarks of Silicon Laboratories Inc.
Other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders
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