RT8100A Datasheet, PDF (1/18 Pages) Richtek Technology Corporation – Synchronous buck PWM DC/DC with Dual Voltage Control Mode

Preliminary
RT8100A
Synchronous buck PWM DC/DC with Dual Voltage Control Mode
General Description
The RT8100A is an advanced DC/DC synchronous buck
PWM controller with several innovative functions for specific
customer’ s ASIC only. The part features RichTek’ s
innovative design and topology say “analogous current
mode” for current sensing and full functions for various
applications including adjustable soft start, free-run and
adjustable operation frequency and enable; the part is with
design of 12V+12V boot strapped driver which is capable
to drive up to 20Amp output current; moreover the part is
with implementation of accuracy DCR current sensing
topology. There are several specific features implemented
and reserved for the specific customer’ s special
applications including dual V_CORE control mode including
tracking and stand-alone mode, and output current
indication. The part is proposed with a small footprint of
VQFN-16L 3x3 package.
Ordering Information
RT8100A
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)
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 Analogous Current Mode Design
z 2.5V to 12V Switching Source Power
z 0.8V to 3.3V Output Voltage Regulation
z Adjustable V<sub>IN</sub> Feed-Forward Ramp Slope
z Adjustable Operation Frequency
z Precise Core Voltage Regulation
z Precise DCR Current Sensing with High Quality
Capacitor, X7R
z ± 1.5% System Accuracy
z Input Voltage : 12V and 5V Bias
z Enable Function
z RoHS Compliant and 100% Lead (Pb)-Free
z Over Current Protection
z External Soft Start Setting
z Operation Frequency up to 1.0MHz
z Dual Mode Voltage Control
`Tracking Mode
`Stand-Alone Mode
z Output Current Indication
z 16-Lead VQFN Package
Applications
z MB memory and chipset core power
z Middle-high graphic card GPU and memory core power
z General-purpose fields including server, NB, bare-bone
and mini-system
Pin Configurations
(TOP VIEW)
16 15 14 13
5VSB 1
RT 2
I_IND 3
RR 4
GND
17
12 LGATE
11 PVCC
10 SS
9 PI
5678
VQFN-16L 3X3
DS8100A-01 August 2007
www.richtek.com
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