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ZLDO285 데이터시트 PDF




Zetex Semiconductors에서 제조한 전자 부품 ZLDO285은 전자 산업 및 응용 분야에서
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부품번호 ZLDO285 기능
기능 ULTRA LOW DROPOUT REGULATOR
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ZLDO285 데이터시트, 핀배열, 회로
2.85 VOLT ULTRA LOW DROPOUT
REGULATOR
ZLDO285
ISSUE 2 - JUNE 1997
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 2.85 to 12 volts, this
device provides an output voltage of 2.85 volts.
The ZLDO285 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.
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
www.DataSheeit4dUe.caoml 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
2.85 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
Low Battery Flag
THERMAL
SHUTDOWN
LOW BATTERY
COMPARATOR
Vin
Vo
Shutdown
Control
SHUTDOWN
BIAS
CIRCUIT
OUTPUT
DRIVE
BANDGAP
REFERENCE
Cs
Shaping
Gnd




ZLDO285 pdf, 반도체, 판매, 대치품
ZLDO285
TYPICAL CHARACTERISTICS
1000
Cout = 1µF
800
600
400
200
10pF
4.7pF
2.2pF
0
100 1k 10k
Frequency (Hz)
Output Impedance v Frequency
100k
55
Cout=1uF
50
45
40
35
2.2pF
4.7pF
30 10pF
25
20
15
10
5
0
100 1K 10K
Frequency (Hz)
Ripple Rejection v Frequency
100K
2.950
Io=10mA
Vin=5v
2.900
2.850
2.800
2.750
-40 -20
0 20 40 60 80
Temperature (°C)
Output Voltage Temperature Coefficient
600
560
Vin=5v
520
480
440
400
-40 -20
0 20 40 60
Temperature (°C)
Quiescent Current v Temperature
80
18.0
16.0
Vin=5v
14.0
12.0
10.0
8.0
6.0
-40 -20
0 20 40 60 80
Temperature (°C)
Shutdown Current v Temperature
3.10
3.09
Vin=5v
Io=10mA
3.08
3.07
3.06
3.05
3.04
-40 -20
0 20 40 60 80
Temperature (°C)
Low Battery Flag Operating Point

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ZLDO285 전자부품, 판매, 대치품
ZLDO285
APPLICATIONS
3). Low Battery Flag
The ZLDO285 provides an output called Low
Battery Flag (LBF). Unlike many regulators that
only signal that they are falling out of regulation,
the LBF output of the ZLDO285 indicates that the
voltage drop across the regulator has fallen to
less than typically 300mV and so supply failure is
imminent.
4). Over Temperature Shutdown
The ZLDO285 regulator includes an over
temperature shutdown circuit that disables the
regulator if its chip temperature should exceed
125°C for any reason. Although intended to
provide a limited guard against excessive internal
power dissipation, this circuit will shut down the
regulator if its ambient rises above 125°C.
4.8V
ZLDO285
LBF Spg
SC Gnd
Vin D/C
N/C Vout
C3
100nF
C1
10pF
+2.85V
R1
100k
C2
1µF
Microproc.
System
Interrupt
Input
0V
Figure 3
This improved warning gives both more time for
the system supplied to shutdown gracefully and
maintains regulation while this happens. This
could be a vital point if measurements are under
way and must be completed accurately for
instance. The LBF output is driven by an open
collector NPN transistor which pulls low when
the supply to the regulator is failing. Figure 3
shows this output being used. Note that resistor
R1 is necessary only if the interrupt logic does not
include a pull-up resistor.
Thus, the regulator could be used to disable a
circuit in the event of the ambient temperature
within which the circuit is mounted becoming
too high. Any internal power dissipation caused
as a result of supplying load current, will reduce
the ambient temperature at which shutdown
occurs. Note that to achieve the extremely low
dropout voltage and high current performance
provided by the ZLDO devices, the parts can be
damaged by sustained output shorts or
excessive loads when combined with high input
supply voltages. To ensure reliable operation,
keep loads within the SOA graph boundaries
indicated in the typical characteristics.

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부품번호상세설명 및 기능제조사
ZLDO285

ULTRA LOW DROPOUT REGULATOR

Zetex Semiconductors
Zetex Semiconductors

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