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IRU3038
SYNCHRONOUS PWM CONTROLLER FOR TERMINATION POWER SUPPLY APPLICATIONS
International
TOR Rectifier
Data Sheet No. PD94250
IRU3038
SYNCHRONOUS PWM CONTROLLER
FOR TERMINATION POWER SUPPLY APPLICATIONS
FEATU RES
EI Synchronous Controller in 14-Pin Package
El Operating with single 5V or 12V supply voltage
El 200KHz to 400KHz operation set by an external
resistor
Soft-Start Function
Fixed Frequency Voltage Mode
500mA Peak Output Drive Capability
Uncommitted Error Amplifier available for DDR
voltage tracking application
1.25V Reference Voltage
Protects the output when control FET is shorted
APPLICATIONS
n DDR memory source sink Vtt application
[I Low cost on-board DC to DC such as
5V to 3.3V, 2.5V or 1.8V
PRELIMINARY DATA SHEET
DESCRIPTION
The IRU3038 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 IRU3038
together with dual N-channel MOSFETs such as IRF7313,
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 device when an output short is detected.
El Graphic Card
D Hard Disk Drive
I YPICAL APPLICATION
VDDQ _ 777W
(2_5v) _L02 _hC3 NH -CC4
1uF 1OTPB1OOM, 47 F
' T 100uF,55mQ T u
DDR Vcc IA: L- Q1
Memory HDTV D1 ii"1 1/20fIRF7313 L2
U1 - BAT54 7W . Cl W
- or1N4148 fAB316P-103,1aF,39A
IRU3038 LDrv b'-,- 02 ty-CI, 06 1.25V@3A
Ir'"- 1/2oflRF7313 T 2X6TPB150|VL
- Rt PGnd == 150u=,55mQ
car- Fty
Figure 1 - Typical application of IRU3038 when Vtt tracks the VDDQ.
PACKAGE ORDER INFORMATION
TA (°C) DEVICE PACKAGE
0 To 70 IRU3038CF 14-Pin Plastic TSSOP (F)
0 To 70 IRU3038CS 14-Pin Plastic SOIC NB (S)
Rev. 2.0 1
09I12I02
IRU3038
International
TOR Rectifier
ABSOLUTE MAXIMUM RATINGS
Vcc Supply Voltage ..............................
Vc Supply Voltage .................................
Storage Temperature Range ..................
Operating Junction Temperature Range .
.................... 25V
30V (not rated for inductive load)
-65°C To 150°C
0°C To 125°C
PACKAGE INFORMATION
14-PIN PLASTIC TSSOP (F)
FbE O E NC
VP E E ss
WEFE E Conrp
Vcc E E] Rt
NC E EVC
LDNE E HDrv
GndE E PGnd
6JA=1OO°CNV
14-PIN PLASTIC SOIC (S)
FbE El NC
v1: E E 58
VREFE E] Comp
VocE E Rt
NC E Eiu,
LDNE El HON
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 1.225 1.250 1.275 V
Fb Voltage Line Regulation LREG 5
UVLO Threshold - Vcc UVLO Vcc Supply Ramping Up 4 4.2 4.4 V
UVLO Hysteresis - Vcc 0.25 V
UVLO Threshold - Vc UVLO Vc Supply Ramping Up 3.1 3.3 3.5 V
UVLO Hysteresis - Vc 0.2 V
UVLO Threshold - Fb UVLO Fb Fb Ramping Down 0.4 0.6 0.8 V
UVLO Hysteresis - Fb 0.1 V
Supply Current
Vcc Dynamic Supply Current Dyn Icc Freq=200KHz, CL=1500pF 2 5 8 mA
Vc Dynamic Supply Current Dyn lc Freq=200KHz, CL=1500pF 2 7 10 mA
Vcc Static Supply Current loco SS=0V 1 3.5 6 mA
Vc Static Supply Current La SS=0V 0.5 1 4.5 mA
Soft-Start Section
Charge Current SSIB SS=0V -10 -20 -30 WA
2 Rev. 2.0
09I12I02
