5.0 VOLT ULTRA LOW DROPOUT
REGULATOR
ZLDO500
ISSUE 2 - JULY 1997
DEVICE DESCRIPTION
FEATURES
The ZLDO Series low dropout linear
regulators operate with an exceptionally
low dropout voltage, typically only 30mV
with a load current of 100mA. The regulator
series features output voltages in the range
2.7 to 18 volts, this device provides anoutput
voltage of 5.0 volts.
Very low dropout voltage
6mV dropout at 10mA output
30mV dropout at 100mA output
100mV dropout at 300mA output
5.0 volt fixed output
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Other voltages available
Low quiescent current
The ZLDO500 consumes a typical quiescent
current of only 1mA at its maximum rated
output current of 300mA. A battery low flag
is available to indicate potential power fail
situations. If the input voltage falls to within
200mV of the regulated output voltage then
the error output pulls low. The device also
features an active high disable control. Once
disabled the ZLDO quiescent current falls to
typically 11µA.
1mA quiescent at 300mA output
Low battery flag
Shutdown control
Surface mount package
APPLICATIONS
The ZLDO devices are packaged in Zetex
SM8 8 pin small outline surface mount
package, ideal for applications where space
saving is important. The device low dropout
voltage, low quiescentcurrent andsmall size
make it ideal for low power and battery
powered applications. Battery powered
circuits can make particular use of the low
battery flag and shutdown features.
Battery powered devices
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Portable instruments
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Portable communications
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Laptop/Palmtop computers
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Electronic organisers
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Low Battery Flag
Vin
LOW BATTERY
COMPARATOR
THERMAL
SHUTDOWN
Vo
OUTPUT
DRIVE
BIAS
Shutdown
Control
CIRCUIT
Cs
SHUTDOWN
BANDGAP
REFERENCE
Shaping
Gnd
4-80