RT8805 Datasheet, PDF (1/15 Pages) Richtek Technology Corporation – Two Phase General Purpose PWM Controller

Preliminary
RT8805
Two Phase General Purpose PWM Controller
General Description
The RT8805 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 RT8805 comes to a tiny footprint package of
VQFN-16L 3x3 package that is capable of dissipating up
to 1.47W heat.
Ordering Information
RT8805
Package Type
QV : VQFN-16L 3x3 (V-Type)
Operating Temperature Range
P : Pb Free with Commercial Standard
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 Small 16-Lead VQFN Package
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
Pin Configurations
(TOP VIEW)
Note :
RichTek Pb-free 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.
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.
16 15 14 13
UGATE1 ₁
BOOT1 2
AGND 3
IMAX 4
GND
12 PHASE2
11 UGATE2
10 BOOT2
9 PGOOD
5678
VQFN-16L 3x3
DS8805-01 November 2005
www.richtek.com
1