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IRU3037ACFTRPBF-IRU3037ACSPBF-IRU3037CFTRPBF
8 PWM 400 KHz Sync Contr in a 8-Pin TSSOP package
International
TOR Rectifier
FEATU RES
El Synchronous Controller in 8-Pin Package
El Operating with single 5V or 12V supply voltage
Data Sheet No. PD94173
IRU3037 / IRU3037A
8-PIN SYNCHRONOUS PWM CONTROLLER
Internal 200KHz Oscillator
(400KHz for IRU3037A)
Soft-Start Function
Fixed Frequency Voltage Mode
500mA Peak Output Drive Capability
Protects the output when control FET is shorted
APPLICATIONS
2.5V or 1.8V
[I Graphic Card
Hard Disk Drive
DDR memory source sink Vtt application
Low cost on-board DC to DC such as 5V to 3.3V,
DESCRIPTION
The IRU3037 controller IC is designed to provide a low
cost synchronous Buck regulator for on-board DC to DC
converter applications. With the migration of today's ASIC
products requiring low supply voltages such as 1.8V and
lower, together with currents in excess of 3A, traditional
linear regulators are simply too lossy to be used when
input supply is 5V or even in some cases with 3.3V
input supply. The IRU3037 together with dual N-channel
MOSFETs such as IRF7313, provide a low cost solution
for such applications. This device features an internal
200KHz oscillator (400KHz for "A" version), under-volt-
age lockout for both Vcc and Vc supplies, an external
programmable soft-start function as well as output un-
der-voltage detection that latches off the device when an
output short is detected.
I Y PICAL APPLICATION
12V L1
PWriPWT
CSL I fl C4 l C2 1uFl __' C1
0-1uF 1uF 10TPB1OOM, 47uF
Voc Vc
HD'V 5 1/2 of IRF7313 L2
ss U1 7NNN'N - El 1.5V/5A
cLC- IRU3037 J 005022P-562, SELFl, 5.3A l
0.1uF LDN —' Q r G7
:1 1/2 oflRF7313 T 2xsTPC150n/I,
I Iauz, 40rd)
Comp _ R3
cscC' H, 144
2200pF 249, 1%
124K 1%
Figure 1 - Typical application of IRU3037 or IRU3037A.
PACKAGE ORDER INFORMATION
TA (°C) DEVICE PACKAGE FREQUENCY
0 To 70 |RU3037CF 8-Pin Plastic TSSOP (F) 200KHZ
0 To 70 |RU3037CS 8-Pin Plastic SOIC NB (S) 200KHZ
0 To 70 IRU3037ACF 8-Pin Plastic TSSOP (F) 400KHZ
0 To 70 IRU3037ACS 8-Pin Plastic SOIC NB (S) 400KHZ
Rev. 2.7
08/22/02
IRU3037 l IRU3037A
International
TOR Rectifier
ABSOLUTE MAXIMUM RATINGS
Vcc Supply Voltage _.................................................
Vc Supply Voltage w.....................................................
Storage Temperature Range ......................................
Operating Junction Temperature Range .....................
30V (not rated for inductive load)
-65°C To 150°C
0°C To 125°C
PACKAGE INFORMATION
8-PIN PLASTIC TSSOP (F) 8-PIN PLASTIC SOIC (S)
Ft: E O E ss
Vcch EComp
LDNE E Vc
GndE E HDrv
GJA=124°CNV 9JA=160°CNV
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these speefcations 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
Fb Voltage VFB IRU3037 1.225 1.250 1.275
IRU3037A 0.784 0.800 0.816 V
Fb Voltage Line Regulation LREG 5
UVLO Threshold - Vcc UVLO Vcc Supply Ramping Up 4.0 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 (IRU3037) 0.4 0.6 0.8 V
(IRU3037A) 0.3 0.4 0.5
UVLO Hysteresis - Fb 0.1 V
Supply Current
Vcc Dynamic Supply Current Dyn lcc Freq=200KHz, (K=1500pF 2 5 8 mA
Vc Dynamic Supply Current Dyn Ic Freq=200KHz, CL=1500pF 2 7 10 mA
Vcc Static Supply Current bca SS=0V 1 3.3 6 mA
Vc Static Supply Current lco SS=0V 0.5 1 4.5 mA
Soft-Start Section
Charge Current SSIB SS=0V -10 -20 -30 WA
Rev. 2.7
08/22/02
