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IRU3138CSPBF-IRU3138CSTRPBF
Synchronous PWM Controller for Termination Power Supply Applications in a 14-Pin SOIC package
International
TOR. Rectifier
Data Sheet No. P094701 revA
IRU3138
FEATURES
1A Peak Output Drive Capability
SYNCHRONOUS PWM CONTROLLER
FOR TERMINATION POWER SUPPLY APPLICATIONS
" 0.8V Precision Reference Voltage Available
" Shuts off both drivers at shorted output
and shutdown
" 200KHz to 4OOKHz operation set by an external
resistor
" Soft-Start Function
" Uncommitted ErrorAmpIifier available for DDR
voltage tracking application
" Protects the output when control FET is shorted
" Synchronous Controller in 14-Pin Package
APPLICATIONS
" DDR memory source sink Vtt application
I: Graphic Card
" Low cost on-board DC to DC such as
5V to 3.3V, 2.5V or 1.8V
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 4OOKHz,
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.
TYPICAL APPLICATION
(iogj)in- I11 12V L1
. J_ Cl J_ C2 i as luH _: C4
lomF INF I2x47uF I 47uF
DDR 'll - VREFVCC Vc -
Memory VP HDrv T: IRF7460
IRE C5 SS/SD U1 BAT54 "iv:jvH" Cl Vtt
owl IRU3138 3.3u 1.25V @ 10A
v LDrv A- - cs
'- IRF7456
- 2x 150 F
Rt PGnd T 40mQ u
T Com c-r
ssooCIZ p Fb
Figure 1 - Typical application of IRU3138 when VTT tracks the VDDQ.
PACKAGE ORDER INFORMATION
TA (°C)
DEVICE
PACKAGE
0T0 70
IRU3138CS
14-Pin Plastic SOIC NB (S)
International
IRU3138 " . .
TOR. Rectifier
ABSOLUTE MAXIMUM RATINGS
Vcc Supply Voltage .................................................. -0.5V - 25V
Vc Supply Voltage .................................................... -0.5V - 25V
Storage Temperature Range ...................................... -65°C To 150°C
Operating Junction Temperature Range ..................... 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)
Fb E E] NC
Ve E E] SS/S-D
VREF E RI Comp
Vcc E E Rt
NC E Ei Vc
LDrv E E HDrv
Gnd E E PGnd
6JA=88°C/W
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over Vcc=5V, Vc=12V and TA=O 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 l/rs 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 Ic Freq=200KHz, CL=3000pF 11 14 mA
Vcc Static Supply Current loco SS=0V 4 6 mA
Vc Static Supply Current loo SS=OV 2.5 4 mA
Soft-Start Section
Charge Current SSB SS=OV 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
