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PDF RT8100 Data sheet ( Hoja de datos )
| Número de pieza | RT8100 | |
| Descripción | Synchronous buck PWM DC/DC | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT8100 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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Preliminary
RT8100
Synchronous buck PWM DC/DC
with Dual Voltage Control Mode
General Description
The RT8100 is an advancedDC/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 VCORE 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
RT8100
Package Type
QV : VQFN-16L 3x3 (V-Type)
Operating Temperature Range
P : Pb Free with Commercial Standard
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.
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 VIN 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
12 LGATE
11 PVCC
10 SS
9 PI
5678
DS8100-00 January 2006
VQFN-16L 3X3
www.richtek.com
1
1 page  
Function Block Diagram
Preliminary
RT8100
12VCC 5VSB
RT Oscillator free Running 200kHz
SS Soft Stsrt
CLK
POR Power_sel
PI
CSN
CSP
I_IND
RR
VREF
+GM
-
x4
S/H
S/H
CLK
Ramp
Current
Generator
EN & VIN Detection
To RR Pin
VREF_SEL
OCP
Current to
Voltage
Converter
+
-
+
-
PWMCP
PWM
Logic
Driver
PVCC
PVCC
FB
COMP
BOOT
UGATE
PHASE
LGATE
GND
Operation
RT8100 is a highly flexible, high performance and high
precision synchronous buck controller specifically
designed for high-end graphic core power supply as well
as DDR applications, with highly reduced external
components and costs.
RT8100 uses RichTek proprietary Analogous Current
ModeTM topology which mimics the traditional peak current
mode by sensing the valley current of the inductor via DCR
sensing techniques and simulating the current ramp with
an artificial ramp set externally. The Analogous Current
Mode topology benefits all the advantages of peak current
mode converter with much higher noise immunity than
conventional one. Since the compensation is easier and
with less constraint than that in voltage mode, using low
ESR output capacitor as MLCC is possible, which therefore
dramatically reduce the board size as well as the cost and
has better transient response due to higher control
bandwidth. RT8100 also adopts VIN feedfoward for ramp
setting, which decreases the complexity for compensation
by keeping the modulator gain constant along line
variations.
The wide input voltage range of the converter ranges from
3.3V to 12V. The output voltage can be set from 0.8V to
3.3V with external resistor divider.
The power sequence of RT8100 includes :
1 : POR function
2 : VIN power supply detection
3 : PI pin setting to enable the whole chip.
The external elements selection of RT8100 includes :
1 : RT pin resister to GND to set the operation frequency
of the chip.
2 : CSN pin resister to set the current gain(ratio of
inductance current IL and sensed current Ix).
3 : RR pin resister to VIN to set the slope of the VIN feed
forward ramp and the effective slope compensation of
current mode.
4 : Use RCSN resister to set the over current level.
5 : Capacitor at SS pin to set the soft-start time.
6 : Type two compensation at COMP pin.
DS8100-00 January 2006
www.richtek.com
5
5 Page 
Preliminary
GM
350
300
250
200
150
100
50
0
0 2 4 6 8 10 12 14 16 18 20
Output Current (A)
RT8100
DS8100-00 January 2006
www.richtek.com
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet RT8100.PDF ] | |
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