Data Sheet No. PD94132
IRU1176
7.5A ULTRA LOW DROPOUT POSITIVE
ADJUSTABLE REGULATOR WITH SHUTDOWN INPUT
FEATURES
Guar...
Data Sheet No. PD94132
IRU1176
7.5A ULTRA LOW DROPOUT POSITIVE
ADJUSTABLE
REGULATOR WITH SHUTDOWN INPUT
FEATURES
Guaranteed <0.65V Dropout at 7.5A Fast Transient Response 1% Voltage Reference Initial Accuracy Built-In Thermal Shutdown
APPLICATIONS
3.3V to 2.7V Intel I740 Chip Set
DESCRIPTION
The IRU1176 is a 7.5A
regulator with extremely low dropout voltage using a proprietary Bipolar process that achieves comparable equivalent on resistance to that of discrete MOSFETs. The IRU1176 also provides a convenient shutdown pin that allows the
regulator to be shutdown and reduce the input current consumption. Unlike the
PNP type
regulators this device does not have high quiescent current during the start up mode making it ideal for applications where there is limited current capability such operation from the 5V standby supply of the computer power supply. One application is the new generation of RDRAM memory that needs to provide 2.5V from 3.3V input and be able to operate from 5VSB as well.
TYPICAL APPLICATION
3.3V
C1
IRU1176
VIN 7 VIN 6 VCTRL 5 VOUT 4 Adj 3 SD 2 VSENSE 1
5V
C2 Q1
2.7V
R1 C3
R2
SD Enable
Figure 1 - Typical application of IRU1176.
PACKAGE ORDER INFORMATION
TJ (°C) 0 To 125
7-PIN PLASTIC TO-263 (M) IRU1176CM
7-PIN PLASTIC Ultra Thin-PakTM (P)
IRU1176CP
Rev. 1.5 07/16/02
www.irf.com
1
IRU1176
ABSOLUTE MAXIMUM RATINGS
Input Voltage (VIN) .................................................... 7V Control Input Voltage (VCTRL) ...........................