RT9210GC RICHTEK [Richtek Technology Corporation], RT9210GC Datasheet

RT9210GC

Manufacturer Part Number

RT9210GC

Description

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

Manufacturer

RICHTEK [Richtek Technology Corporation]

Datasheet

1.RT9210GC.pdf (17 pages)

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Dual 5V Synchronous Buck DC-DC PWM Controller

for DDR Memory V

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

memory, V

for V

the control, output adjustment, monitoring and protection

functions into a single package.

The V

during S3 sleep mode, the V

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

regulator. The V

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

MOSFET which eliminates the need for a current sensing

resistor.

Ordering Information

Note :

RichTek Pb-free and Green products are :

DS9210-05 March 2007

RT9210

RoHS compliant and compatible with the current require-

Suitable for use in SnPb or Pb-free soldering processes.

100% matte tin (Sn) plating.

ments of IPC/JEDEC J-STD-020.

accurately tracks V

REF

DDQ

supply can be turned off independently of V

reference. V

regulator by using the R

for signal termination and a buffered amplifier

Package Type

C : TSSOP-24

S : SOP-24

Operating Temperature Range

P : Pb Free with Commercial Standard

G : Green (Halogen Free with Commer-

regulator features internal compensation

cial Standard)

REF

tracks (V

. The RT9210 integrates all of

output is maintained by a

DDQ

DS(ON)

DDQ

/2) to ±30mV, and

for powering DDR

of the upper

and V

Preliminary

DDQ

Termination

Features

Applications

Pin Configurations

Operating with Single 5V Supply Voltage

High Power V

Support

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

Sense Resistor Required

RoHS Compliant and 100% Lead (Pb)-Free

DDR Memory Termination Supply

SSTL_2 and SSTL_3 Interfaces

Graph Card, Motherboard, Desktop Servers

High Power Tracking DC-DC Regulators

Tracks (V

Regulator Internally Compensated

VREF_IN

“

UGATE2

UGATE1

PHASE1

SENSE1

COMP1

BOOT1

BOOT2

GNDA

VREF

”

FB1

DDQ

Sleep Mode

TSSOP-24 & SOP-24

/2) to ±30mV

, V

(TOP VIEW)

and V

REF

for DDR Memory

SENSE2

VCC

LGATE2

PGND2

PGND1

LGATE1

PVCC1

OCSET/SD

V2_SD

PGOOD

RT9210

, No Current

www.richtek.com

Related parts for RT9210GC

RT9210GC Summary of contents

Page 1

Dual 5V Synchronous Buck DC-DC PWM Controller for DDR Memory V 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 designed to ...

Page 2

RT9210 Typical AppIication Circuit V IN 2.5V/3.3V/5V R1 3.48k Q5 RESET VTT_SD VREF_IN C3 100pF C4 0.1uF C6 VREF_OUT 100pF C7 0.1uF 1k www.richtek.com 2 Preliminary C2 1uF C1 1nF RT9210 15 19 VCC PGOOD 21 2 OCSET/SD BOOT1 7 ...

Page 3

Functional Pin Description UGATE1 (Pin 1) V upper gate driver output. Connect to gate of the high- DDQ side power N-MOSFET. This pin is monitored by the adaptive shoot-through protection circuitry to determine when the upper MOSFET has turned off. ...

Page 4

RT9210 NC (Pin 18) No internal connection. SENSE2 (Pin 17) This pin is connected directly to the regulated output of V supply. This pin is also used as the feedback pin of TT the V regulator ...

Page 5

Function Block Diagram VCC FB1 Power PGOOD Good COMP1 VREF VREE_IN SENSE1 SENSE2 Regulator V2_SD DS9210-05 March 2007 Preliminary 137.5% 0.8V 62.5% Ref. OV OVP 0.8V & UV UVP + + 200k 200k 300kHz Oscillator + ...

Page 6

RT9210 Absolute Maximum Ratings Supply Voltage, V -------------------------------------------------------------------------------------------------- 7V CC ------------------------------------------------------------------------------------------------ 7V BOOT BOOT PHASE Input, Output or I/O Voltage ----------------------------------------------------------------------------------------- GND-0. Package Thermal Resistance TSSOP-24, θ --------------------------------------------------------------------------------------------------------- 100°C/W JA SOP-24, θ ------------------------------------------------------------------------------------------------------------ 90°C/W JA ...

Page 7

Parameter Window Regulator Load Current Output Voltage Error PWM Controller Gate Drivers Upper Gate Source (UGATE1 and 2) Upper Gate Sink (UGATE1 and 2) Lower Gate Source (LGATE1 and 2) Lower Gate Sink (LGATE1 and 2) Upper Gate Rising Time ...

Page 8

RT9210 Typical Operating Characteristics POR ( Start Up) 1V/Div Time (5ms/Div) Power Good Rising 5V/Div V CC 5V/Div PGOOD 2V/Div V DDQ Time (5ms/Div) Power DDQ 2V/Div 1V/Div UGATE1 5V/Div Time ...

Page 9

UGATE Phase Shift UGATE1 UGATE2 Time (1μs/Div) V Sleep Mode TT 5V/Div Vvs_sd 2V/Div V DDQ 20mV/Div V TT UGATE2 Time (5μs/Div) V DDQ V DDQ V FB1 UGATE1 Time (10ms/Div) DS9210-05 March 2007 Preliminary 5V/Div LGATE1 5V/Div LGATE2 Vvs_sd ...

Page 10

RT9210 V DDQ V DDQ DDQ 2.5V DDQ Time (250μs/Div) V Sink & Source TT 100mV/Div V DDQ 100mV/Div 2000μF OUT ...

Page 11

POR vs. Temperature 4.4 4.2 4 3.8 3.6 3.4 3.2 3 -40 -10 20 Temperature (°C) DS9210-05 March 2007 Preliminary Rising Falling 50 80 110 140 RT9210 www.richtek.com 11 ...

Page 12

RT9210 Applications Information Inductor The inductor is required to supply constant current to the output load. The inductor is selected to meet the output voltage ripple requirements and minimize the converter's response time to the load transient. A larger value ...

Page 13

Output Capacitor The output capacitor is required to maintain the DC output voltage and supply the load transient current. The capacitor must be selected and placed carefully to yield optimal results and should be chosen to provide acceptable ripple on ...

Page 14

RT9210 Feedback Compensation The RT9210 is a voltage mode controller; the control loop is a single voltage feedback path including an error amplifier and PWM comparator as Figure 1 shows. In order to achieve fast transient response and accurate output ...

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RT9210GC RICHTEK [Richtek Technology Corporation], RT9210GC Datasheet

RT9210GC

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RT9210GC Summary of contents

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