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L1087-3.3

0.8A Fixed and Adjustable Low Dropout Linear Regulator (LDO)



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L1087-3.3 pdf
NIKO-SEM
0.8A Fixed and Adjustable Low Dropout
Linear Regulator (LDO)
L1087 Series
SOT-89,TO-92
GENERAL DESCRIPTION
The L1087 Series are positive and low
dropout three-terminal voltage regulators
with 0.8A output current capability. These
devices are designed for use in low voltage
applications that offers lower dropout volt-
age and faster transient response.
These devices are fully protected against
over current faults, over temperature oper-
ation, reversed input polarity, reversed lead
insertion, transient voltage spike …etc.
On-Chips trimming the reference voltage to
1% and features the low dropout of maxi-
mum 1.45 volts.
The L1087 Series regulators offer fixed and
adjustable voltage options available in the
space saving SOT-89 & TO-92 package.
FEATURES
z Fixed 3.3V or adjustable output voltage
z Low dropout voltage
z Low ground current
z Fast transient response
z Current & thermal limiting
z Line regulation: 0.5% typical
z Load regulation: 0.5% typical
z Available in SOT-89 & TO-92 package
APPLICATIONS
z Low voltage micro-controllers
z Battery Chargers
z 5V to 3.3V linear regulators
z Motherboard clock supplies
z Post regulator for switching supplies
TYPICAL APPLICATION
Vin
Cin
10uF
+
L1087
IN OUT
ADJ
Vref
Iadj
Vout
R1
Cout
+
10uF
R2
Vin > 4.75V
IN
L1087-3.3
OUT
Vout = 3.3V
Cin
+
10uF
GND
Cout
+
10uF
RL
Vo = Vref (1+R2/R1) + Iadj x R2
1. Cin needed if device is far from filter capacitors.
2. Cout required for stability.
- Basic Adjustable Regulator Circuit -
1. Cin needed if device is far from filter capacitors.
2. Cout required for stability.
- Fixed Voltage Regulator -
1 AUG-30-2001



No Preview Available !

L1087-3.3 pdf
NIKO-SEM
0.8A Fixed and Adjustable Low Dropout
Linear Regulator (LDO)
L1087 Series
SOT-89,TO-92
ABSOLUTE MAXIMUM RATINGS
z Maximum Supply Voltage
z Power Dissipation
15V*
Internally
Limited
z Operating Junction
Temperature Range
z Storage Temperature
Range
0 to 125 °C
-40 to 150 °C
z Thermal Resistance
Junction to Case, θJC
18 °C/W
z Lead Temperature
(Soldering, 10 Seconds)
260 °C
z Thermal Resistance
Junction to Ambient, θJA
160 °C/W
* When considering short circuits to ground, the maximum input-to-output differential voltage shall not be allowed
greater than approximate 2~3V at values of supply voltage in excess of 10V, continuous short-circuits can exceed
the power dissipation ratings and cause eventual destruction.
ELECTRICAL CHARACTERISTICS (Unless otherwise specified, TA = 25 °C)
Parameter
Symbol
Test Conditions
Typical
Reference Voltage
(Adjustable version) VREF VIN = 5V, IOUT = 10mA
1.25V
Output Voltage
(Fixed version)
VO VIN = 5V, IOUT = 10mA
VO
Dropout Voltage
VD ΔVREF = 1%, IOUT = 0.8A
1.2V
Line Regulation
REG(LINE) (VOUT + 1.5V) VIN 15V, IOUT = 10mA 0.5%
Load Regulation
Minimum Load
Current
REG(LOAD) (VIN -VOUT) = 2V, 10mA IOUT 0.8A
IO 1.5V (VIN -VOUT) 5.75V
0.5%
10mA
Adjust Pin Current IADJ
55µA
Current Limit
ICL VIN - VOUT = 2V
1.2A
RMS Output Noise VN
0.003%
of VOUT
Ripple Rejection
Ratio
RA
f = 120Hz, CADJ = 22µF for ADJ pin,
VIN = 5V, IOUT = 0.8A
72dB
Limits
1.23VMin
1.27VMax
0.98VO(Min)
1.02VO(Max)
1.45V
2%
2.5%
100µA
0.9A (Min)
60dB (Min)
2 AUG-30-2001



Part Number L1087-3.3
Description 0.8A Fixed and Adjustable Low Dropout Linear Regulator (LDO)
Maker ETC - ETC
Total Page 6 Pages
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