Diodes ZLDO485 - Manual

DEVICE DESCRIPTION
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 an output
voltage of 4.85 volts.
The ZLDO485 consumes a typical quiescent
current of only 1mA and is rated to supply
load currents up to 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 11
µ
A.
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 quiescent current and small 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.
FEATURES
•
Very low dropout voltage
•
6mV dropout at 10mA output
•
30mV dropout at 100mA output
•
100mV dropout at 300mA output
•
4.85 volt fixed output
•
Other voltages available
•
Low quiescent current
•
1mA quiescent (typ) at 300mA output
•
Low battery flag
•
Shutdown control
•
Surface mount package
APPLICATIONS
•
Battery powered devices
•
Portable instruments
•
Portable communications
•
Laptop/Palmtop computers
•
Electronic organisers
4.85 VOLT ULTRA LOW DROPOUT
REGULATOR
ISSUE 2 - MAY 1997
LOW BATTERY
COMPARATOR
Low Battery Flag
Vin
OUTPUT
DRIVE
BIAS
CIRCUIT
SHUTDOWN
THERMAL
SHUTDOWN
Shutdown
Control
BANDGAP
REFERENCE
Vo
Shaping
Gnd
Cs
ZLDO485
4-71