ISL6504A

Features:

• Provides four ACPI-Controlled Voltages
-5VDUAL USB/Keyboard/Mouse
-3.3VDUAL/3.3VSB PCI/Auxiliary/LAN
-1.2VVID Processor VID Circuitry
-1.5VSB ICH4 Resume Well
• Excellent Output Voltage Regulation
- All Outputs: ±2.0% over temperature (as applicable)
• Small Size; Very Low External Component Count
• Undervoltage Monitoring of All Outputs with Centralized
FAULT Reporting and Temperature Shutdown
• QFN Package:
- Near Chip Scale Package Footprint; Improved PCB
Efficiency; Thinner profile
• Pb-Free Available (RoHS Compliant)




Application

• ACPI-Compliant Power Regulation for Motherboards
- ISL6504: 5VDUAL is shut down in S4/S5 sleep states
- ISL6504A: 5VDUAL stays on in S4/S5 sleep states




Pinout






Specifications

Supply Voltage, V_5VSB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7.0V
DLA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to +14.5V
All Other Pins. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+ 7.0V
ESD Classification (Human Body Model) . . . . . . . . . . . . . . . . . .2kV

Description

The ISL6504 and ISL6504A complement other power building blocks (voltage regulators) in ACPI-compliant designs for microprocessor and comp -uter applications. The IC ISL6504A integrates three linear controllers/regulators, switching, monitoring and control functions into a 16-pin wide-body SOIC or 20-pin QFN 6x6 package. The ISL6504, ISL6504A operating mode (active outputs or sleep outputs) is selectable through two digital control pins, S3 and S5.

One linear controller ISL6504A generates the 3.3VDUAL/3.3VSB voltage plane from the ATX supply's 5VSB output, powering the south bridge and the PCI slots through an external NPN pass transistor during sleep states (S3, S4/S5). In active state (during S0 and S1/S2), the 3.3VDUAL/3.3VSB linear regulator uses an external N-channel pass MOSFET to connect the outputs directly to the 3.3V input supplied by an ATX power supply, for minimal losses.

A controller powers up the 5VDUAL plane by switching in the ATX 5V output through an NMOS transistor in active states, or by switching in the ATX 5VSB through a PMOS (or PNP) transistor in S3 sleep state. In S4/S5 sleep states, the ISL6504A 5VDUAL output is shut down. In the ISL6504A, the 5VDUAL output stays on during S4/S5 sleep states. This is the only difference between the two parts; see Table 1.

An internal linear regulator supplies the 1.2V for the voltage identification circuitry (VID) only during active states (S0 and S1/S2), and uses the 3V3 pin as input source for its internal pass element. Another internal regulator outputs a 1.5VSB chip-set standby supply, which uses the 3V3DL pin as input source for its internal pass element. The 3.3VDUAL/3.3VSB and 1.5VSB outputs are active for as long as the ATX 5VSB voltage is applied to the chip.