MAX8594 Datasheet, PDF(13/22 Page) Maxim Integrated Products – 5-Output PMICs with DC-DC Core Supply for Low-Cost PDAs

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MAX8594 Datasheet, PDF (13/22 Pages) Maxim Integrated Products – 5-Output PMICs with DC-DC Core Supply for Low-Cost PDAs

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5-Output PMICs with DC-DC Core Supply for

Low-Cost PDAs

Pin Description (continued)

NAME

FUNCTION

LCD True-Shutdown Switch Output. SW is the power source for the LCD boost inductor. SW turns on

when ENL is high. For best efficiency, bypass SW with a 4.7ÂµF capacitor to GND. SW is disconnected

from PV when LCD is shut down.

Power Input for COR1 Buck Converter and LCD True-Shutdown Switch. Connect IN to PV.

PGND Power Ground

LXC

COR1 Switching Node. Connect LXC to the COR1 inductor. See Figure 1.

ENC1

Enable Input for Primary Core Buck Converter (COR1). Drive ENC1 high to turn on COR1 and low to

turn off. COR1 cannot be activated if VIN is below the DBI threshold or before MAIN is in regulation.

ENSD

Enable Input for Secure Digital Card (SDIG). Drive ENSD low to turn off SDIG and high to turn on.

SDIG cannot be activated when VIN is below the DBI threshold or before MAIN is in regulation.

Feedback Sense Input for COR1 Output. COR1 turns off when VIN is below the DBI threshold, when

COR1 ENC1 goes low, or when MAIN is out of regulation. When off, the output is discharged by LXC through

an internal 1Mâ¦ (typ) resistor.

Enable Input for Secondary Core LDO (COR2). Drive ENC2 high to turn on COR2 and low to turn off.

ENC2 COR2 cannot be activated when VIN is below the DBI threshold or before MAIN is in regulation. COR2

can be activated when VIN is greater than the DBI threshold and MAIN is in regulation.

1.8V, 50mA LDO Output for Secondary Core. COR2 turns off when VIN is below the DBI threshold,

COR2 when ENC2 goes low, or when MAIN is out of regulation. The COR2 output is discharged at a rate

depending on the load and the internal feedback resistors (typically 700kâ¦).

3.3V, 500mA LDO Output for Main Supply. MAIN output turns off when VIN is below the DBI threshold

MAIN or when ENM goes low. When off, the output is discharged at a rate depending on the load and the

internal feedback resistors (1.3Mâ¦ typ).

Exposed Pad. Connect to ground for enhanced power dissipation.

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