SI8251-IM Silicon Laboratories Inc, SI8251-IM Datasheet - Page 15

• Manufacturer Part Number: SI8251-IM
• Description: IC DIGITAL PWR CONTROLLER 32LQFP
• Manufacturer: Silicon Laboratories Inc
• Type: SMPS Controllerr

Specifications of SI8251-IM

• Applications: Digital Power Controller
• Voltage - Supply: 2.25 V ~ 2.75 V
• Current - Supply: 26mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 28-QFN
• Product: MOSFET Gate Drivers
• Mounting Style: SMD/SMT
• For Use With: 336-1323 - KIT REFERENCE DESIGN FOR SI825X
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Voltage - Input: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

3. Product Description
SYSCLKIN
VSENSE
DEBUG
PORT
VDD
VREF
IPK
System Management Processor
Control Processor
VREF
50MIPS 8051 CPU
VSENSE
and Memory
SYSCLKIN
REFDAC
VSENSE
DEBUG
PORT
VREF
VDD
IPK
10Msps
ADC1
Pulse-by-Pulse
Current Limiter
System Management Processor
Control Processor
VREF
2% 25 Mhz OSC,
and OCP
HARDWARE
INTERRUPT
CONTROL
CONTROL
VSENSE
12-Bit, 200Ksps
and LFO
Figure 2. Si8250 Top-Level Block Diagram
DEBUG
RESET
10-Channel
REFDAC
ADC 0
FILTER ENGINE
Digital Peripherals:
- UART
- SMBus Port
- 4 x 16-Bit Timers
- 3 Ch PCA (PWM)
- I/O Port Latches
Figure 1. Functional Block Diagram
DSP
ICYC
OCP
10 MHz
VSENSE
ADC
SENSOR
TEMP
Pulse-by-Pulse
Current Limiter
and OCP
u(n)
DETECTORS
REGISTERS
MULTIPHASE
& LIMIT
ADC
DPWM
Rev. 1.0
FILTER ENGINE
1280 Byte
16/32 kB
Si8250
Flash
RAM
DSP
ICYC
OCP
LOGIC
200 Ksps
AUTO
SCAN
12-BIT
ADC
Control Outputs
SUPPLY INPUT
3 CH PCA
LATCHES
I/O PORT
Up to 6 Gate
4x 16-BIT
TIMERS
SMBus
VSENSE
UART
Digital Ouput (e.g. fan speed control)
VOLTAGE
Analog Input (e.g. average current)
SENSOR
u(n)
Analog/Digital I/O Lines
TEMP
16 General-Purpose
Si8250/1/2
MULTIPHASE
Peak Current Signal (e.g. CT)
DPWM
8
DRIVERS
GATE
GATE CONTROL
(6)
MAGNETICS
I/O (8)
SWITCHES
I/O (8)
AND
Si8250/1/2
POWER STAGES
OUTPUT
FILTER
VOUT
15