Global Mixed-mode Technology G2992 Datasheet

Global Mixed-mode Technology Inc.

G2992

3A DDR Bus Termination Regulator

Features

 V  Termination Supply Voltage: 1.8V to 3.6V

 Support Both DDR I(1.25V

 Requires Only 20µF Ceramic Output Capacitor  Low Output Offset  3A Source and Sink Current  Low External Component Count  No Inductor Required  Thermal Shutdown Protection  Over Current Protection  Suspend to RAM (STR) Function with

 SOP-8 (FD) Package

Supply Voltage: 3.3V to 5.5V

CNTL

V

) Requirements

TT

High-impedance output

) and DDR II (0.9

TT

Applications

 DDR-SDRAM Termination Voltage  DDR I / DDR II Termination Voltage  SSTL-18  SSTL-2  SSTL-3

General Description

The G2992 is a linear regulator designed to meet the JEDEC SSTL-18, SSTL-2 and SSTL-3 (Series Stub Termination Logic) specifications for termination of

DDR I / II -SDRAM. It contains a high-speed opera-

tional amplifier that provides excellent response to the load transients. This device can deliver 3A continuous current in the application such as required for DDR I/ II SDRAM termination. The G2992 can easily provide

the accurate V

voltage with two external resistors

TT

generating reference voltage. The quiescent current is as low as 750µA @ V

= 3.3V. So the power con-

CNTL

sumption can meet the low power consumption applications. The G2992 also has a shutdown function by

setting V

smaller than 0.2V, that provides Suspend

REF

to RAM (STR) functionality. When in the shutdown mode, the V

output (on V

TT

pin) will be tri-state

OUT

providing a high impendence. A power saving advantage can be obtained in this mode through lowering

the quiescent current to 50μA @ V

CNTL

= 3.3V.

Ordering Information

ORDER

NUMBER

MARKING

G2992F1U G2992 -40°C to +85°C SOP-8 (FD)

Note: U: Tape & Reel

(FD): Thermal Pad

TEMP.

RANGE

PACKAGE

(Pb free)

Pin Configuration Typical Application Circuit

=3.3V

V

CNTL

V

=2.5V

IN

1

EN

2N7002

R

1

R

2

C

SS

VIN VCNTL

VREF

GND

VOUT

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1

VIN

2

GND

3

VREF

4

VOUT

Ver: 1.0

Aug 29, 2006

G2992

SOP-8(FD)

8

7

6

5

NC

VCNTL

NC

R

TT

C

CNTL

IN

C

R

OUT

DUMMY

Global Mixed-mode Technology Inc.

Absolute Maximum Ratings

Supply Voltage V

to GND. . . . . . . . . . . . . . . . . . . . . . -0.3V to +7V

CNTL

Maximum Junction Temperature, T Storage Temperature Range, T

STG

Reflow Temperature (soldering, 10sec) . . . . . . 260°C

Thermal Resistance Junction to Ambient, (θ

SOP-8 (FD). . . . . . . . . . . . . . . . . . . . . . . . . . ..50°C/W

Electrostatic Discharge, V

ESD

Human body mode. . . . . . . . . . . . . . . . . . . . . 2000V

Note:

(1)

: Absolute maximum rating indicates limits beyond which damage to the device may occurs.

(2)

: Human body model : C = 100pF, R = 1500Ω, 3 positive pulses plus 3 negative pulses.

(3)

:VIN and V

mustn’t be higher than V

REF

Electrical Characteristics

Specifications with standard typeface are for TA=25°C, VIN=2.5V, V Unless otherwise specified.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNIT

Output Offset Voltage

VTT output voltage

VTT Output Voltage Load Regulation (DDR I/DDR II)

Input Voltage Range (DDR I/DDR II)

Control Voltage Range (DDR I/DDR II)

Quiescent Current

Quiescent Current in Shutdown

Current Limit

Thermal Shutdown Temperature

Thermal Shutdown Hysteresis

Shutdown High Trigger Level Output

Shutdown Low Trigger Level Output

(1)

. . . . . . . . 150°C

J

. . -65°C to+150°C

)

JA

(2)

.

CNTL

V

-20 0 20 mV

(DDR I/DDR II) --- 1.25/0.9 --- V I

VTT

|I

VTT

|I

VTT

1.8 2.5/1.8 3.6 V

--- 3.3 5.5 V

I

OUT

V

REF

3 --- --- A

3.3V≦V

--- 20 --- °C

Output active 0.8 --- --- V

Output disable --- --- 0.2 V

V

∆V

V

I

CNTL

I

LIMIT

T

OS

TT

V

IN

CNTL

I

SD

TS

HYS

V

IH

V

IL

Recommend Operation Range

Operating Ambient Temperature Range T

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C

A

V

to GND. . . . . . . . . . . . . . . . . . . . . . 3.3V to 5.5V

CNTL

to GND. . . . . . . . . . . . . . . . . . . . . . . . 1.8V to 3.6V

V

IN

to GND . . . . . . . . . . . . . . . . . . . . . . . .0 to V

V

REF

CNTL

=0, V

|<1.5A,V

|<3A, V

=0A --- 750 1500 µA

<0.2V --- 50 90 µA

=½VIN

REF

=½VIN

REF

=½VIN

REF

≦5.5V --- 160 --- °C

CNTL

G2992

(3)

=3.3V, V

-20 --- 20

-30 --- 30

-40 --- 40

=1.25V, C

REF

OUT

CNTL

=20µF.

mV

Ver: 1.0

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2

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Global Mixed-mode Technology Inc.

Typical Performance Characteristics

C

=1µF/MLCC/X5R, CIN=22µF/MLCC/X7R, CSS=1µF/MLCC/X5R, C

CNTL

wise noted.

V

is Shorted to GND

OUT

V

=5.0V,VIN=2.5V

CNTL

G2992

=20µF/X5R/MLCC unless other-

OUT

V

is Shorted to VIN (2.5V)

OUT

V

=5.0V,VIN=2.5V

CNTL

V

Load Transient Response

OUT

V

=5.0V,VIN=2.5V

CNTL

V

Load Transient Response

OUT

V

=5.0V,VIN=1.8V

CNTL

Sourcing Current Limit vs Temperature Sourcing Current Limit vs Temperature

5.6

5.4

5.2

5

4.8

4.6

4.4

V

=3.3V,VIN=1.8V

CNTL

4.2

4

3.8

Sourcing Current Limit (A)

3.6

3.4

3.2

-40 -20 0 20 40 60 80 100 120

V

=5.5V,VIN=1.8V

CNTL

Temperature (°C)

4

3.9

3.8

V

=3.3V,VIN=2.5V

3.7

3.6

3.5

Sourcing Current Limit (A)

3.4

3.3

CNTL

V

=5.5V,VIN=2.5V

CNTL

-40 -20 0 20 40 60 80 100 120

Temperature (°C)

Ver: 1.0

Aug 29, 2006

3

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Global Mixed-mode Technology Inc.

Typical Performance Characteristics (continued)

G2992

Sinking Current Limit vs Temperature

4.4

4.3

4.2

4.1

4

3.9

3.8

3.7

3.6

3.5

Sinking Current Limit (A)

3.4

3.3

3.2

-40 -20 0 20 40 60 80 100 120

V

Shutdown Threshold vs Temperature

REF

0.8

0.7

0.6

V

0.5

0.4

Shutdown Threshold (V)

REF

V

0.3

0.2

-40 -20 0 20 40 60 80 100 120

CNTL

V

CNTL

V

CNTL

V

CNTL

Temperature (°C)

=5V

=3.3V

Temperature (°C)

=5.5V,VIN=1.8V

=3.3V,VIN=1.8V

Sinking Current Limit vs Temperature

4.4

4.3

4.2

4.1

4

3.9

3.8

3.7

3.6

3.5

Sinking Current Limit (A)

3.4

3.3

3.2

-40 -20 0 20 40 60 80 100 120

Supply Current vs Vout Load Current

V

CNTL

1.2

1.15

1.1

1.05

1

0.95

Supply Current (mA)

CNTL

0.9

V

0.85

0.8

-2 -1.5 -1 -0.5 0 0.5 1 1.5 2

V

=5.5V,VIN=2.5V

CNTL

V

=3.3V,VIN=2.5V

CNTL

Temperature (°C)

V

CNTL

Load Current (A)

V

OUT

=5.0V,VIN=1.8V

vs Temperature

R

DS(ON)

0.18

0.17

0.16

0.15

(Ω)

0.14

DS(ON)

R

0.13

0.12

0.11

0.1

-40 -20 0 20 40 60 80 100 120

VIN=0.85V

Temperature (°C)

VIN=0.9V

Ver: 1.0

Aug 29, 2006

VIN=0.8V

V

=3.3V

CNTL

4

R

vs Temperature

DS(ON)

0.16

0.15

0.14

0.13

(Ω)

0.12

DS(ON)

R

0.11

0.1

0.09

-40 -20 0 20 40 60 80 100 120

VIN=0.9V

VIN=0.85V

VIN=0.8V

V

CNTL

Temperature (°C)

=5.0V

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Global Mixed-mode Technology Inc.

Typical Performance Characteristics (continued)

V

Supply Current vs Temperature

CNTL

1

G2992

V

Supply Current vs. V

CNTL

Supply Voltage

1

CNTL

0.95

0.9

0.85

0.8

0.75

Supply Current (mA)

CNTL

V

0.7

0.65

-40-200 20406080100120

Shutdown Current vs Temperature

V

CNTL

62

60

A)

µ

58

56

54

52

Shutdown Current (

50

CNTL

V

48

46

-40-200 20406080100120

V

=5.0V,VIN=2.5V

CNTL

Temperature (°C)

V

=5.0V,VIN=2.5V

CNTL

Temperature (°C)

Supply Current (mA)

CNTL

V

0.95

0.9

0.85

0.8

0.75

0.7

0.65

TA=120°C

TA=25°C

TA=0°C

3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4 5.7 6 V

Supply Voltage (V)

CNTL

V

Shutdown Current vs V

CNTL

Supply Voltage

69

66

A)

µ

63

60

57

54

Shutdown Current (

51

CNTL

V

48

45

3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4 5.7 6

TA=120°C

TA=25°C

V

CNTL

TA=0°C

Supply Voltage (V)

CNTL

VIN Dropout Voltage vs Output Current

1.2

V V

1

0.8

0.6

0.4

Dropout Voltage (V)

0.2

0

00.511.522.53

Ver: 1.0

Aug 29, 2006

REF

CNTL

=0.9V

=3.3V

TA=75°C

TA=125°C

Output Current (A)

TA=25°C

TA=-50°C

5

Recommended Minimum Footprint

SOP-8 (FD)

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Global Mixed-mode Technology Inc.

Pin Description

PIN NAME FUNCTION

1 VIN Terminator Power pin.

2 GND Ground

3 VREF

4 VOUT Terminator output pin (VTT voltage supplied)

5,7,8 NC No Connection

6 VCNTL Internal circuit power pin, at least 3.3V

Block Diagram

VREF

Application Information

Output Capacitor

For stable operation, total capacitance of the V put terminal can be equal or greater than 20µF. The output capacitor should be located near V terminal as close as possible to minimize the effect of ESR and ESL.

Power on sequence

For safely operation, The G2992 must keep V voltage larger than VIN, this condition is due to the internal parasitic diodes between V G2992 will consume large current when V larger than V

Consideration of the V

The V

REF

.

CNTL

REF

voltage is applied by a buffered mid-rail

Terminator reference input voltage, 1.25V for DDR I, 0.9V for DDR II. Below 0.2V, the chip will be shutdown.

VIN

GND

Shutdown

VCNTL

+

voltage which is generated by a resistor divider be-

TT

out-

tween V

and GND. Using a capacitor tapped to the

IN

voltage divider can form a low-pass filter. It can in-

output

TT

crease both the soft-start interval and the noise immunity.

Input Capacitor

Adding a capacitance close to V V

performance when fast load- transient. In general,

TT

1/2 C Separating the V

is recommended for the VIN capacitance.

OUT

and V

IN

sient performance.

to V

IN

. The

CNTL

voltage is

IN

CNTL

A ceramic capacitance with a value between 1.0µF

Voltage

and 4.7µF close to the V stabilize the V

CNTL

voltage.

G2992

VOUT

pin can improve the

IN

pins will get better tran-

CNTL

pin is recommended to

CNTL

Ver: 1.0

Aug 29, 2006

6

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Global Mixed-mode Technology Inc.

Package Information

0.004MAX.

0.004MAX.0.004MAX.

0.015x45º

G2992

D1

0.008TYP

E1

E

H

L

D

θ

A2

A

SEATING PLANE

A1

e

B

A1

SOP- 8 (F1) Package

Note:

1. JEDEC Outline: MS-012 AA/E.P. Version: N/A

2. Dimension “D” does not include mold flash, protrusions or gate burrs. Mold flash, protrusions and gate burrs shall not exceed .15mm (.006in) per side.

3. Dimensions “E” does not include inter-lead flash, or protrusions inter-lead flash and protrusions shall not ex-

ceed .25mm (.010in) per side.

SYMBOL

A 1.35 1.75 0.053 0.069

A1 0.00 0.13 0.000 0.005

A2 ----- 1.50 ----- 0.059

B 0.41TYP 0.016TYP

D 4.80 4.98 0.189 0.196

E 3.81 3.99 0.150 0.157

e 1.27TYP 0.05TYP

H 5.80 6.20 0.228 0.244

L 0.41 1.27 0.016 0.050

θ

D1 ----- 2.29 ----- 0.090

E1 ----- 2.29 ----- 0.090

DIMENSION IN MM DIMENSION IN INCH

MIN. MAX. MIN. MAX.

0º 8º 0º 8º

Taping Specification

PACKAGE Q’TY/REEL

SOP-8 (FD) 2,500 ea

Typical SOP Package Orientation

GMT Inc. does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and GMT Inc. reserves the right at any time without notice to change said circuitry and specifications.

Ver: 1.0

Aug 29, 2006

Feed Direction

7

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