NIKO L1087, L1087-3.3 Datasheet

NIKO-SEM
GENERAL DESCRIPTION
FEATURES
L1087 Series
SOT-89,TO-92
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 volt­age and faster transient response.
These devices are fully protected against over current faults, over temperature oper­ation, reversed input polarity, reversed lead insertion, transient voltage spike …etc.
On-Chips trimming the reference voltage to 1% and features the low dropout of maxi­mum 1.45 volts.
The L1087 Series regulators offer fixed and adjustable voltage options available in the space saving SOT-89 & TO-92 package.
TYPICAL APPLICATION
Fixed 3.3V or adjustable output voltage
z
Low dropout voltage
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Low ground current
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Fast transient response
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Current & thermal lim iting
z
Line regulation: 0.5% typical
z
Load regulation: 0.5% typical
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Available in SOT-89 & TO-92 package
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APPLICATIONS
Low voltage micro-controllers
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Battery Chargers
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5V to 3.3V linear regulators
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Motherboard clock supplies
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Post regulator for switching supplies
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Cin 10uF
L1087
IN OUT
ADJ
+
Iadj
Vref
R1
R2
VoutVin
Cout
+
10uF
Vin > 4.75V
Cin 10uF
+
IN
L1087-3.3
GND
OUT
Cout 10uF
+
Vo = Vref (1+R2/R1) + Iadj x R2
1. Cin needed if device is far from filter capacitors.
2. Cout required for stability.
1. Cin needed if device is far from filter capacitors.
2. Cout required for stability.
- Basic Adjustable Regulator Circuit - - Fixed Voltage Regulator -
Vout = 3.3V
RL
1
AUG-30-2001
NIKO-SEM
ABSOLUTE MAXIMUM RATINGS
L1087 Series
SOT-89,TO-92
Maximum Supply Voltage 15V*
z
Power Dissipation
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Thermal Resistance
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Junction to Case,
Thermal Resistance
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Junction to Ambient,
* 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.
θ
JC
θ
JA
Internally
Limited
18 °C/W
160 °C/W
Operating Junction
z
Temperature Range
Storage Temperature
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Range
Lead Temperature
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(Soldering, 10 Seconds)
0 to 125 °C
-40 to 150 °C
260 °C
ELECTRICAL CHARACTERISTICS
Parameter
Reference Voltage (Adjustable version)
Symbol
V
Output Voltage (Fixed version) Dropout Voltage VD
Line Regulation REG Load Regulation REG
Minimum Load Current
Adjust Pin Current I Current Limit ICL VIN - V
RMS Output Noise VN Ripple Rejection
Ratio
VIN = 5V, I
REF
VO VIN = 5V, I
V
= 1%, I
REF
+ 1.5V) ≤ V
OUT IN -VOUT
OUT
(LINE)
(LOAD)
IO
ADJ
Δ
(V (V
1.5V ≤ (V
0.003%
R
f = 120Hz, C
A
V
= 5V, I
IN
Test Conditions Typical Limits
OUT
OUT
) = 2V, 10mA ≤ I
IN -VOUT
= 2V 1.2A 0.9A (Min)
OUT
(Unless otherwise specified, TA = 25 °C)
= 10mA = 10mA
OUT
= 0.8A
15V, I
IN
OUT
OUT
= 10mA
≤ 0.8A
) ≤ 5.75V
= 22µF for ADJ pin,
ADJ
= 0.8A
1.25V VO
1.23V
1.27V
0.98V
1.02V
Min
Max
O(Min)
O(Max)
1.2V 1.45V
0.5% 2%
0.5% 2.5%
10mA
55µA 100µA
of V
OUT
72dB 60dB (Min)
2
AUG-30-2001
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