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IRU3137CS
Synchronous PWM Controller for DDR Memory Applications in a 8-Pin SOIC package
International
TOR Rectifier
Data Sheet No. PD94700
IRU3137
8-PIN SYNCHRONOUS PWM CONTROLLER
FEATU RES
" 1A Peak Output Drive Capability
" 0.8V Reference Voltage
I: Shuts off both drivers at shorted output
and shutdown
" Operating with single 5V or 12V supply voltage
I: Stable with ceramic capacitors
" Internal 200KHz Oscillator
" Soft-Start Function
" Protects the output when control FET is shorted
I: Synchronous Controller in 8-Pin Package
APPLICATIONS
DESCRIPTION
The IRU3137 controller IC is designed to provide a low
cost and high performance synchronous Buck regulator
for on-board DC to DC converter applications. The out-
put voltage can be set as low as 0.8V and higher voltage
can be obtained with an external voltage divider. High
peak current gate drivers provide fast switching transi-
tion for applications requiring high output current in the
range of 15A to 20A.
This device features an internal 200KHz oscillator, un-
der-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.
u DDR Memory Application
a Low voltage distributed DC-DC
a Graphic Cards
II Low cost on-board DC to DC such as 5V to 2.5V,
1.8V or 0.8V
TYPICAL APPLICATION
Optional
Vcc Vc
HDN 'r- IRF7832
SS/S7 D1 L2 2 5V
C8 T - 2.2uH @ 15A
0.1uF Q2
l U1 LDN q IRF7832 gx7330uF
IRU3137 _L- 40rnfl, Poscap
Comp - Ji',
Fb 2.15K
1”: 1K,1%
Figure 1 - Typical application of IRU3137.
PACKAGE ORDER INFORMATION
TA(°C) DEVICE PACKAGE FREQUENCY
0 To 70 IRU3137CS 8-Pin Plastic SOIC NB (S) 200KHz
Rev. 1.0
06/22/04
vwvw.irf.com
International
IRU3137 . .
TOR Rectifier
ABSOLUTE MAXIMUM RATINGS
Vcc Supply Voltage _................................................. -0.5V - 25V
Vc Supply Voltage M................................................... -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
8-PIN PLASTIC SOIC NB (S)
Fb E E ss
Vcc IE E Comp
LDrv E E Vc
Gnd E E HDrv
GJA=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.
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
Reference Voltage
Fb Voltage VFB 0.784 0.800 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 0.25 V
Supply Current
Vcc Dynamic Supply Current Dyn Icc Freq=200KHz, CL=3000pF 6.5 8 mA
Vc Dynamic Supply Current Dyn lc Freq=200KHz, CK=3000pF 11 14 mA
Vcc Static Supply Current Icco SS=0V 4 6 mA
Vc Static Supply Current lco SS=0V 2.5 4 mA
Soft-Start Section
Charge Current SSe SS=0V 15 22 30 wA
2 Rev. 1.0
06/22/04
