RT8800_11 Datasheet, PDF (1/26 Pages) Richtek Technology Corporation – General Purpose 2/3-Phase PWM Controller for High-Density Power Supply

RT8800/B
General Purpose 2/3-Phase PWM Controller for High-Density
Power Supply
General Description
The RT8800/B are general purpose multi-phase
synchronous buck controllers dedicating for high density
power supply regulation. The parts implement 2, and 3
buck switching stages operating in interleaved phase set
automatically. The output voltage is regulated and
controlled following the input voltage of FB pin. With such
a single analog control, the RT8800/B provide a simple,
flexible, wide-range and extreme cost-effective high-
density voltage regulation solutions for various high-density
power supply application. The RT8800/B multi-phase
architecture provide high output current while maintaining
low power dissipation on power devices and low stress
on input and output capacitors. The high equivalent
operating frequency also reduces the component
dimension and the output voltage ripple in load transient.
RT8800/B implement both voltage and current loops to
achieve good regulation, response and power stage
thermal balance. The RT8800/B apply the time sharing
DCR current sensing technology newly as well; with such
a topology, the RT8800/B extract the DCR of output
inductor as sense component to deliver a more precise
load line regulation and better thermal balance capability.
Moreover, the parts monitor the output voltage for over-
current and over-voltage protection; Soft-start and
programmable under-voltage lockout are also provided to
assure the safety of power system.
Applications
z Desktop CPU core power
z Low Output Voltage, High power density DC-DC
Converters
z Voltage Regulator Modules
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Features
z 5V Power Supply Voltage
z 2/3-Phase Power Conversion with Automatic Phase
Selection (RT8800 : 2/3-Phase, RT8800B : 2-Phase)
z Output Voltage Controlled by External Reference
Voltage
z Precise Core Voltage Regulation
z Power Stage Thermal Balance by DCR Current
Sensing
z Extreme Low-Cost, Lossless Time Sharing Current
Sensing
z Internal Soft-start
z Hiccup Mode Over-Current Protection
z Over-Voltage Protection
z Adjustable Operating Frequency and Typical at
300kHz Per Phase
z Power Good indication
z Small 16-Lead VQFN Package (For RT8800 only)
z RoHS Compliant and 100% Lead (Pb)-Free
Ordering Information
RT8800/B
Note :
Package Type
QV : VQFN-16L 3x3 (V-Type)
S : SOP-16
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
2-Phase
2/3-Phase
Richtek products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
DS8800/B-08 April 2011
www.richtek.com
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