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IRU3037-IRU3037A
8-PIN SYNCHRONOUS PWM CONTROLLER
International
OR Rectifier
Data Sheet No. PD94173
IRU3037 / IRU3037A
8-PIN SYNCHRONOUS PWM CONTROLLER
FEATU RES
Synchronous Controller in 8-Pin Package
Operating with single 5V or 12V supply voltage
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
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
I DDR memory source sink Vtt application 200KHz oscillator (400KHz for "A" version), under-volt-
Low cost on- -board DC to DC such as 5V to 3.3V, age lockout for both Vcc and Vc supplies, an external
2.5V or 1.8V programmable soft-start function as well as output un-
Graphic Card der-voltage detection that latches off the device when an
Hard Disk Drive output short is detected.
IYPICAL APPLICATION
12V L1
cc] l '04 J: C2 1uH , -01
1uF 1uF 10TPB100M, 47uF
l T I100uF 55mg It
Vcc .Vc
HDN 3211/2 of IRF7313 L2
SSIS_D PV"WWE - 1.5V/5A
asuE . JRUl32137 J Q2 D05022P-562, 5.6uH, 5.3A l Cl
0'1“; Hhv —i"__“ 1/2 of IRF7313 SZNPCWM
I 150uF, 40m
c 7 R3
ccC- . tXTIP fb w»
2200pF 249,1%
R4' R5
24k 1.24K, 1%
Figure 1 - Typical application of IRU3037 or |RU3037A.
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. 2.8
03/1 0103
International
IRU3037 l IRU3037A . .
TOR Rectifier
ABSOLUTE MAXIMUM RATINGS
Vcc Supply Voltage _................................................. 25V
Vc Supply Voltage w..................................................... 30V (not rated for inductive load)
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
8-PIN PLASTIC TSSOP (F) 8-PIN PLASTIC SOIC (S)
RE q Elss/sTo Fb E q El SS/TD
Vcch ZIComp Vcc E El Comp
LDrv E El Vc LDN E E Vc
.GndE EH9” Gnd E E HDN
6JA=124°CNV 6JA=160°CNV
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
Fb Voltage I/re 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, CL=1500pF 2 5 8 mA
Vc Dynamic Supply Current Dyn k; Freq=200KHz, (K=1500pF 2 7 10 mA
Vcc Static Supply Current bca SS=0V 1 3.3 6 mA
Vc Static Supply Current loo SS=0V 0.5 1 4.5 mA
Soft-Start Section
Charge Current SSIB SS=0V -10 -20 -30 wA
2 Rev. 2.8
05I10I04
