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IRU3138CSPBF

Description
Switching Regulator/Controller, Voltage-mode, 440kHz Switching Freq-Max, BIPolar, PDSO14,
CategoryPower/power management    The power supply circuit   
File Size149KB,18 Pages
ManufacturerInternational Rectifier ( Infineon )
Websitehttp://www.irf.com/
Environmental Compliance  
Download Datasheet Parametric View All

IRU3138CSPBF Overview

Switching Regulator/Controller, Voltage-mode, 440kHz Switching Freq-Max, BIPolar, PDSO14,

IRU3138CSPBF Parametric

Parameter NameAttribute value
Is it lead-free?Lead free
Is it Rohs certified?conform to
MakerInternational Rectifier ( Infineon )
Reach Compliance Codeunknown
ECCN codeEAR99
control modeVOLTAGE-MODE
JESD-30 codeR-PDSO-G14
JESD-609 codee3
Number of terminals14
Maximum operating temperature70 °C
Minimum operating temperature
Package body materialPLASTIC/EPOXY
encapsulated codeSOP
Encapsulate equivalent codeSOP14,.25
Package shapeRECTANGULAR
Package formSMALL OUTLINE
Peak Reflow Temperature (Celsius)260
Certification statusNot Qualified
surface mountYES
Maximum switching frequency440 kHz
technologyBIPOLAR
Temperature levelCOMMERCIAL
Terminal surfaceMatte Tin (Sn)
Terminal formGULL WING
Terminal pitch1.27 mm
Terminal locationDUAL
Maximum time at peak reflow temperature40
Data Sheet No. PD94701 revA
IRU3138
SYNCHRONOUS PWM CONTROLLER
FOR TERMINATION POWER SUPPLY APPLICATIONS
FEATURES
1A Peak Output Drive Capability
0.8V Precision Reference Voltage Available
Shuts off both drivers at shorted output
and shutdown
200KHz to 400KHz operation set by an external
resistor
Soft-Start Function
Uncommitted Error Amplifier available for DDR
voltage tracking application
Protects the output when control FET is shorted
Synchronous Controller in 14-Pin Package
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.
APPLICATIONS
DDR memory source sink Vtt application
Graphic Card
Low cost on-board DC to DC such as
5V to 3.3V, 2.5V or 1.8V
TYPICAL APPLICATION
5V
V
DDQ
(2.5V)
C1
0.1uF
R1
1K
12V
C2
1uF
C3
2x 47uF
L1
1uH
C4
47uF
DDR
Memory
Vcc
V
REF
V
P
Vc
HDrv
Q1
IRF7460
D1
BAT54
L2
3.3uH
R2
1K
SS/SD
C5
0.1uF
U1
IRU3138
LDrv
PGnd
Fb
Vtt
1.25V @ 10A
C6
2x 150uF
40m
Rt
Comp
C7
3300pF
R3
13K
Q2
IRF7456
Gnd
Figure 1 - Typical application of IRU3138 when V
TT
tracks the V
DDQ
.
PACKAGE ORDER INFORMATION
T
A
(°C)
0 To 70
DEVICE
IRU3138CS
PACKAGE
14-Pin Plastic SOIC NB (S)
www.irf.com
1
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