RT8805C Datasheet, PDF (1/18 Pages) Richtek Technology Corporation – Two Phase General Purpose PWM Controller

Preliminary
RT8805C
Two Phase General Purpose PWM Controller
General Description
The RT8805C is the most compact dual-phase
synchronous buck controller in the industry specifically
designed for high power density applications. This part is
capable of delivering up to 60A output current due to its
embedded bootstrapped drivers that support 12V + 12V
driving capability.
The phase currents are sensed by innovative time sharing
R_DS(ON) current sensing technique for current balance and
over current balance. Using one common GM amplifier to
sense two phase currents eliminates offset and
nonlinearity of the GM amplifier and yields good current
balance. Other features include adjustable operation
frequency from 50kHz to 1MHz, adjustable soft-start,
PGOOD, external compensation, enable/shutdown for
various application and performance consideration.
The RT8805C comes to a tiny footprint package of
VQFN-16L 3x3 and VQFN-24L 4x4 packages.
Ordering Information
RT8805C
Package Type
QV : VQFN-16L 3x3 (V-Type)
QVA : VQFN-24L 4x4 (V-Type)
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
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.
Features
z 12V Power Supply Voltage
z 2 Phase Power Conversion
z Embedded 12V Boot Strapped Driver
z Precise Core Voltage Regulation
z Low Side MOSFET R_DS(ON) Current Sensing for
Power Stage Current Balance
z External Compensation
z Adjustable Soft-Start
z Adjustable Frequency and Typical at 300kHz Per
Phase
z Power Good Indication
z Adjustable Over Current Protection
z External Reference Voltage Tracking (RT8805CxQVA)
z Small 16-Lead and 24-Lead VQFN Packages
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Middle-High End GPU Core Power
z High End Desktop PC Memory 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, otherwise visit our website for detail.
DS8805C-03 August 2007
www.richtek.com
1