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.
Features
Analogous Current Mode Design
2.5V to 12V Switching Source Power
0.8V to 3.3V Output Voltage Regulation
Adjustable V
IN
Feed-Forward Ramp Slope
Adjustable Operation Frequency
Precise Core Voltage Regulation
Precise DCR Current Sensing with High Quality
Capacitor, X7R
±
1.5% System Accuracy
Input Voltage : 12V and 5V Bias
Enable Function
RoHS Compliant and 100% Lead (Pb)-Free
Over Current Protection
External Soft Start Setting
Operation Frequency up to 1.0MHz
Dual Mode Voltage Control
Tracking Mode
Stand-Alone Mode
Output Current Indication
16-Lead VQFN 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)
Applications
MB memory and chipset core power
Middle-high graphic card GPU and memory core power
General-purpose fields including server, NB, bare-bone
and mini-system
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.
Pin Configurations
(TOP VIEW)
UGATE
PHASE
12
LGATE
11
PVCC
10
SS
9
8
12VCC
5VSB
1
RT
2
I_IND
3
RR
4
5
16 15 14 13
BOOT
GND
17
6
7
PI
COMP
VQFN-16L 3X3
DS8100A-01 August 2007
CSN
CSP
FB
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
