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ST1534AP2T
500MA SMART LDO
1/11February 2001
FEAURES GLITCH FREE TRANSITION BETWEEN
INPUT SOURCES INTERNAL LOGIC SELECTS INPUT
SOURCE GATE DRIVE FOR EXTERNAL PMOS
BYPASS SWITCH 5V DETECTOR WITH HYSTERESIS 1% 3.3V REGULATED OUTPUT VOLTAGE 500mA GUARANTEED OUTPUT CURRENT OPERATING TEMPERATURE RANGE
FROM 0°C TO 85°C AVAILABLE IN P2 PAK AND THE SMALLER
PPAK PACKAGES
APPLICATIONS NETWORK INTERFACE CARDS PCMCIA/PCI INTERFACE CARDS DESKTOP COMPUTERS POWER SUPPLY WITH MULTIPLE INPUT
SOURCES
DESCRIPTIONThe ST1534A is Iintended for application such as
power managed PCI and network interface cards
(NICs), where operations from 3.3V VAUX supply
may be required when the 5V supply has been
shut down.
During regular operation, 3.3V power for the PCI
card is provided by the internal LDO regulator,
generated from 5V supply. When the 5V VAUX is
available, theIC connects this supply directly to its
output using an external P-Channel FET. This
ensures an uninterrupted 3.3V out even if VIN falls
out of specification.
When both supplies are available simultaneously,
the drive pin DR will be pulled high, turning off the
PMOS switch.
The device is available in the popular 5 leads2 PAK and PPAK
ST1534A500mA SMART LDO
SCHEMATIC DIAGRAM
ST1534A2/11
ABSOLUTE MAXIMUM RATINGS Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
THERMAL DATA
CONNECTION DIAGRAM (top view)
PIN DESCRIPTION
ORDERING INFORMATION
ST1534A3/11
TYPICAL APPLICATION CIRCUIT
ELECTRICAL CHARACTERISTICS (Tj = 25°C, VI =5V, V AUX =3.3V, IO =10mA, CO = 2.2μF,
unless otherwise specified)
Note 1: Guaranteed by design
Note 2: See timing diagram
ST1534A4/11
5V DETECT THRESHOLDS VIN rise and fall times (10% to 90%) to be > 100μs
TIMING DIAGRAM VIN rise and fall times (10% to 90%) to be > 100μs
ST1534A5/11
TYPICAL CHARACTERISTICS (unless otherwise specified Tj = 25°C)
Figure 1 : Supply Current vs Temperature
Figure 2 : Aux Current vs Temperature
Figure 3 : Drive Current vs Temperature
Figure 4 : Aux Current vs Temperature
Figure 5 : Drive Output Voltage vs Temperature
Figure 6 : Drive Current vs VIN-VDR
ST1534A6/11
Figure 7 : Drive Current vs Temperature
Figure 8 : Line Regulation vs Temperature
Figure 9 : Output Voltage vs Input Voltage
Figure 10 : Output Voltage vs Temperature
Figure 11 : Load Regulation vs Temperature
Figure 12 : Threshold Voltage vs Temperature
