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RT8800A Datasheet(PDF) 1 Page - Richtek Technology Corporation

Part No. RT8800A
Description  General Purpose 3-Phase PWM Controller for High-Density Power Supply
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Maker  RICHTEK [Richtek Technology Corporation]
Homepage  http://www.richtek.com
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RT8800A Datasheet(HTML) 1 Page - Richtek Technology Corporation

 
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RT8800A
1
DS8800A-04 August 2007
www.richtek.com
All brand name or trademark belong to their owner respectively
Features
5V Power Supply Voltage
2/3-Phase Power Conversion with Automatic Phase
Selection
Output Voltage Controlled by External Reference
Voltage
Precise Core Voltage Regulation
Power Stage Thermal Balance by DCR Current
Sensing
Extreme Low-Cost, Lossless Time Sharing Current
Sensing
Internal Soft-Start
Hiccup Mode Over-Current Protection
Over-Voltage Protection
Adjustable Operating Frequency and Typical at
300kHz Per Phase
Power Good Indication
Small 16-Lead VQFN Package
RoHS Compliant and 100% Lead (Pb)-Free
Applications
Desktop CPU Core Power
Low Output Voltage, High Power Density DC-DC
Converters
Voltage Regulator Modules
General Purpose 3-Phase PWM Controller for High-Density
Power Supply
Ordering Information
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area, otherwise visit our website for detail.
Note :
Richtek Pb-free and Green 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.
100% matte tin (Sn) plating.
General Description
The RT8800A is a general-purposed multi-phase
synchronous buck controller dedicating for high power
density applications. The RT8800A operates with 2 or 3
synchronous buck switching stages in interleaved phase
set automatically. The multiphase architecture provides
high output current while maintaining low power dissipation
on power devices and low stress on input and output
capacitors.
The output voltage is precisely regulated to the external
reference voltage at PI pin. The RT8800A can provide Intel®
VRD10.x or AMD® K8 compliant output voltage when
companioned with DAC generator RT9401A/B.
The RT8800A adopts innovative time-sharing DCR current
sensing technique for channel current balance, droop
tuning, and over current protection. Using one common
GM amplifier for current sensing eliminates offset errors
and linearity variation between GMs. As sub-milli-ohm-
grade inductors are widely used in modern mother boards,
slight mismatch of GM amplifiers offset and linearity results
in considerable current shift between phases. The time-
sharing DCR current sensing technique is extremely
important to guarantee phase current balance at mass
production.
Other features include overvoltage protection, undervoltage
protection and internal softstart. The RT8800A comes to
a VQFN-16L 3x3 package.
Package Type
QV : VQFN-16L 3x3 (V-Type)
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
RT8800A


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