IRU3138 ,SYNCHRONOUS PWM CONTROLLER FOR TERMINATION POWER SUPPLY APPLICATIONSAPPLICATIONSoutput under-voltage detection that latches off the de-DDR memory source sink Vtt appli ..
IRU3138CS ,Synchronous PWM Controller for Termination Power Supply Applications in a 14-Pin SOIC packageAPPLICATIONSoutput under-voltage detection that latches off the de-DDR memory source sink Vtt appli ..
IRU3138CSPBF ,Synchronous PWM Controller for Termination Power Supply Applications in a 14-Pin SOIC packageapplications such DDR memory and general purposeand shutdown on-board DC to DC converter. Modern mi ..
IRU3138CSTRPBF ,Synchronous PWM Controller for Termination Power Supply Applications in a 14-Pin SOIC packageAPPLICATIONSoutput under-voltage detection that latches off the de-DDR memory source sink Vtt appli ..
IRU3146CF ,Dual Synchronous PWM Controller with Current Sharing Circuitry and Auto-RestartApplicationsPoint of Load Power ArchitecturesD1C1212VC11C13C3 C4 C14VCL VcH1 VcH2VOUT3HDrv1 Q2VccL3 ..
IRU3146CF ,Dual Synchronous PWM Controller with Current Sharing Circuitry and Auto-RestartfeaturesVcc from 4.5V to 16V Inputoffered by this device include two independent program-Programmab ..
ITA18B1 ,BIDIRECTIONAL TRANSIL ARRAY FOR DATALINE PROTECTIONABSOLUTE MAXIMUM RATINGS (T = 25°C)ambSymbol Parameter Value UnitP Peak pulse power dissipation (8/ ..
ITA18B1RL ,BIDIRECTIONAL TRANSIL" ARRAY FOR DATALINE PROTECTIONITAxxB1®BIDIRECTIONAL TRANSIL™ ARRAYFOR DATALINE PROTECTIONASD™MAIN
ITA18B3RL ,BIDIRECTIONAL TRANSIL" ARRAY FOR DATALINE PROTECTIONITAxxB3®BIDIRECTIONAL TRANSIL™ ARRAYFOR DATALINE PROTECTIONASD™MAIN
ITA18B3RL ,BIDIRECTIONAL TRANSIL" ARRAY FOR DATALINE PROTECTIONFEATURES■ High surge capability Transil array:I = 40 A (8/20µs)PP■ Peak pulse power : 300 W (8/20µs ..
ITA25B1RL ,BIDIRECTIONAL TRANSIL" ARRAY FOR DATALINE PROTECTIONFEATURES■ High surge capability Transil array:I = 40 A (8/20µs)PPTable 1: Order Codes■ Peak pulse p ..
ITA25B3 ,BIDIRECTIONAL TRANSIL ARRAY FOR DATALINE PROTECTIONFEATURESn HIGH SURGE CAPABILITY TRANSIL ARRAYI = 40 A (8/20μs)PPn PEAK PULSE POWER : 300 W (8/20μs) ..
IRU3138
SYNCHRONOUS PWM CONTROLLER FOR TERMINATION POWER SUPPLY APPLICATIONS
International
TOR Rectifier
Data Sheet No. PD94701
IRU3138
SYNCHRONOUS PWM CONTROLLER
FOR TERMINATION POWER SUPPLY APPLICATIONS
FEATU RES
1A Peak Output Drive Capability
DESCRIPTION
The IRU3138 controller IC is designed to provide a low
cost synchronous Buck regulator for voltage tracking
applications such DDR memory and general purpose
on-board DC to DC converter. Modern micro processors
combined with DDR memory, need high-speed bandwidth
data bus which requires a particular bus termination volt-
age. This voltage will be tightly regulated to track the
half of chipset voltage for best performance. The IRU3138
together with two N-channel MOSFETs, provide a low
cost solution for such applications. This device features
a programmable frequency set from 200KHz to 400KHz,
under-voltage lockout for both Vcc and Vc supplies, an
external programmable soft-start function as well as
output under-voltage detection that latches off the de-
vice when an output short is detected.
El 0.8V Precision Reference Voltage Available
El Shuts off both drivers at shorted output
and shutdown
El 200KHz to 400KHz operation set by an external
resistor
D Soft-Start Function
El Uncommitted Error Amplifier available for DDR
voltage tracking application
D Protects the output when control FET is shorted
El Synchronous Controller in 14-Pin Package
APPLICATIONS
I:l DDR memory source sink Vtt application
El Graphic Card
El Low cost on-board DC to DC such as
5V to 3.3V, 2.5V or 1.8V
TYPICAL APPLICATION
VDDQ Cl-
(2.5V)
DDR - vc,"'' Vc
Memory
IRU3138
HD 7 Q1
Mo N _ IRF7460
- DI L2
SSISD BAT54 -
cs-IC' U1 = 7 V 7 V T " Cl Vtt
12V L1
2x 47uF
IIH|TID
_ IRF7456
3300pF Fly
R3 Gnd
13K J7 1
Figure 1 - Typical application of IRU3138 when VTT tracks the V090.
PACKAGE ORDER INFORMATION
Rev. 1.0
01/29/04
TA (°C) DEVICE
PAC KAG E
0 To 70 |RU3138CS
14-Pin Plastic SOIC NB (S)
1
IRU3138
International
TOR Rectifier
ABSOLUTE MAXIMUM RATINGS
Vcc Supply Voltage _.................................................
Vc Supply Voltage w...................................................
Storage Temperature Range ......................................
Operating Junction Temperature Range .....................
-0.5V - 25V
-0.5V - 25V
-65°C To 150°C
0°C To 125°C
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device.
PACKAGE INFORMATION
14-PIN PLASTIC SOIC NB (S)
Ft, E E1] NC
hha E E SS/S_D
NAEF E E Cow
VocE 1C1l Rt
NOE E Vc
LDNE E HDN
GndE E PGnd
6JA=88°C/W
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over Vcc=5V, Vc=12V and TA=0 to 70°C. Typical values refer
to TA=25°C. Low duty cycle pulse testing is used which keeps junction and case temperatures equal to the ambient
temperature.
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
Reference Voltage
VREF Voltage VFB 0.784 0.8 0.816 V
Fb Voltage Line Regulation LREG 5
UVLO Threshold - Vcc UVLO Vcc Supply Ramping Up 4.0 4.25 4.5 V
UVLO Hysteresis - Vcc 0.25 V
UVLO Threshold - Vc UVLO Vc Supply Ramping Up 3.0 3.5 3.65 V
UVLO Hysteresis - Vc 0.25 V
UVLO Threshold - Fb UVLO Fb Fb Ramping Down 0.3 0.4 0.5 V
UVLO Hysteresis - Fb Note 1 0.02 V
Supply Current
Vcc Dynamic Supply Current Dyn Icc Freq=200KHz, CL=3000pF 6.5 8 mA
Vc Dynamic Supply Current Dyn lc Freq=200KHz, CL=3000pF 11 14 mA
Vcc Static Supply Current loco SS=0V 4 6 mA
Vc Static Supply Current La SS=0V 2.5 4 mA
Soft-Start Section
Charge Current SSIB SS=0V 15 20 26 WA
Oscillator
Frequency Freq Rt=Open 180 200 220 KHz
Rt=Gnd 360 400 440
Ramp Amplitude VRAMP Note 1 1.25 V
2 Rev. 1.0
01/29/04
