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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 !

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

No Preview Available !

NIKO-SEM
0.8A Fixed and Adjustable Low Dropout
Linear Regulator (LDO)
L1087 Series
SOT-89,TO-92
ELECTRICAL CHARACTERISTICS FOR FIXED 3.3V(Unless otherwise specified, TA = 25 °C)
Parameter
Symbol
Test Conditions
Typical
Output Voltage
(Fixed version)
Dropout Voltage
Line Regulation
Load Regulation
Minimum Load
Current
GND Pin Current
Current Limit
RMS Output Noise
Ripple Rejection
Ratio
VO VIN = 5V, IOUT = 10mA
VD ΔVO = 1%, IOUT = 0.8A
REG(LINE) (VOUT + 1.5V) VIN 15V, IOUT = 10mA
REG(LOAD) (VIN -VOUT) = 2V, 10mA IOUT 0.8A
IO
IGND
ICL
1.5V (VIN -VOUT) 5.75V
VIN - VOUT = 2V
VN
RA
f = 120Hz, Co=22Uf,VIN = 5V,
IOUT = 0.8A
VO
1.2V
0.5%
0.5%
10mA
55µA
1.2A
0.003%
of VOUT
72dB
Limits
3.234V(Min)
3.367V(Max)
1.45V
2.0%
2.0%
100µA
0.9A (Min)
60dB (Min)
DEVICE SELECTION GUIDE
Device
L1087C
Voltage Version Adjustable
Package
Marking
SOT-89
L1087
L1087C-3.3
3.3V
SOT-89
87-3.3
L1087N-3.3
3.3V
TO-92
87N-3.3
3 AUG-30-2001