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RT9210GS

Description
Dual 5V Synchronous Buck DC-DC PWM Controller for DDR Memory VDDQ and VTT Termination
File Size350KB,17 Pages
ManufacturerRichtek Technology Corporation
Websitehttps://www.richtek.com/
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RT9210GS Overview

Dual 5V Synchronous Buck DC-DC PWM Controller for DDR Memory VDDQ and VTT Termination

Preliminary
RT9210
Dual 5V Synchronous Buck DC-DC PWM Controller
for DDR Memory V
DDQ
and V
TT
Termination
General Description
The RT9210 is a dual high power, high efficiency
synchronous buck DC-DC controller optimized for high
performance double data rate (DDR) memory applications.
It is designed to convert voltage supplies ranging from
4.5V to 5.5V into efficiently 2.5V
DDQ
for powering DDR
memory, V
TT
for signal termination and a buffered amplifier
for V
REF
reference. V
TT
tracks (V
DDQ
/2) to ±30mV, and
V
TT
accurately tracks V
REF
. The RT9210 integrates all of
the control, output adjustment, monitoring and protection
functions into a single package.
The V
TT
supply can be turned off independently of V
DDQ
during S3 sleep mode, the V
TT
output is maintained by a
low power window regulator when V2_SD pin being
triggered high.
The RT9210 provides simple, single feedback loop, voltage
mode control with fast transient response for V
DDQ
regulator. The V
TT
regulator features internal compensation
that eases the circuitry design. It includes two phase-
locked 300kHz sawtooth-wave oscillators which are placed
90° to minimize interference between the two PWM
regulators.
The RT9210 protects against over-current conditions by
inhibiting PWM operation. It also monitors the current in
the V
DDQ
regulator by using the R
DS(ON)
of the upper
MOSFET which eliminates the need for a current sensing
resistor.
Features
Operating with Single 5V Supply Voltage
High Power V
DDQ
, V
TT
and V
REF
for DDR Memory
V
TT
Tracks (V
DDQ
/2) to ±30mV
V
TT
Regulator Internally Compensated
Support
S3
Sleep Mode
Drives All Low Cost N-MOSFETs
Voltage Mode PWM Control
300kHz Fixed Frequency Oscillator
Fast Transient Response :
Full 0% to 100% Duty Ratio
Internal Soft-Start
Adaptive Non-Overlapping Gate Driver
Over-Current Fault Monitor on V
CC
, No Current
Sense Resistor Required
RoHS Compliant and 100% Lead (Pb)-Free
Applications
DDR Memory Termination Supply
SSTL_2 and SSTL_3 Interfaces
Graph Card, Motherboard, Desktop Servers
High Power Tracking DC-DC Regulators
Pin Configurations
(TOP VIEW)
UGATE1
BOOT1
PHASE1
VREF
FB1
COMP1
SENSE1
VREF_IN
GNDA
NC
BOOT2
UGATE2
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
PGND1
LGATE1
PVCC1
OCSET/SD
V2_SD
PGOOD
NC
SENSE2
NC
VCC
LGATE2
PGND2
Ordering Information
RT9210
Package Type
C : TSSOP-24
S : SOP-24
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Note :
TSSOP-24 & SOP-24
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.
DS9210-05 March 2007
www.richtek.com
1

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Description Dual 5V Synchronous Buck DC-DC PWM Controller for DDR Memory VDDQ and VTT Termination Dual 5V Synchronous Buck DC-DC PWM Controller for DDR Memory VDDQ and VTT Termination Dual 5V Synchronous Buck DC-DC PWM Controller for DDR Memory VDDQ and VTT Termination Dual 5V Synchronous Buck DC-DC PWM Controller for DDR Memory VDDQ and VTT Termination Dual 5V Synchronous Buck DC-DC PWM Controller for DDR Memory VDDQ and VTT Termination
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