LT1962 Linear Technology, LT1962 Datasheet

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LT1962

Manufacturer Part Number
LT1962
Description
300mA/ Low Noise/ Micropower LDO Regulators
Manufacturer
Linear Technology
Datasheet

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FEATURES
TYPICAL APPLICATIO
APPLICATIO S
3.7V TO
20V
Low Noise: 20 V
Output Current: 300mA
Low Quiescent Current: 30 A
Wide Input Voltage Range: 1.8V to 20V
Low Dropout Voltage: 270mV
Very Low Shutdown Current: < 1 A
No Protection Diodes Needed
Fixed Output Voltages: 2.5V, 3V, 3.3V, 5V
Adjustable Output from 1.22V to 20V
Stable with 3.3 F Output Capacitor
Stable with Aluminum, Tantalum or
Ceramic Capacitors
Reverse Battery Protection
No Reverse Current
Overcurrent and Overtemperature Protected
8-Lead MSOP Package
Cellular Phones
Battery-Powered Systems
Noise-Sensitive Instrumentation Systems
V
IN
1 F
3.3V Low Noise Regulator
U
RMS
IN
SHDN
LT1962-3.3
(10Hz to 100kHz)
GND
SENSE
OUT
BYP
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
U
1962 TA01
0.01 F
+
10 F
3.3V AT 300mA
20 V
RMS
NOISE
DESCRIPTIO
The LT
dropout regulators. The devices are capable of supplying
300mA of output current with a dropout voltage of 300mV.
Designed for use in battery-powered systems, the low
30 A quiescent current makes them an ideal choice.
Quiescent current is well controlled; it does not rise in
dropout as it does with many other regulators.
A key feature of the LT1962 regulators is low output noise.
With the addition of an external 0.01 F bypass capacitor,
output noise drops to 20 V
bandwidth. The LT1962 regulators are stable with output
capacitors as low as 3.3 F. Small ceramic capacitors can
be used without the series resistance required by other
regulators.
Internal protection circuitry includes reverse battery pro-
tection, current limiting, thermal limiting and reverse
current protection. The parts come in fixed output volt-
ages of 2.5V, 3V, 3.3V and 5V, and as an adjustable device
with a 1.22V reference voltage. The LT1962 regulators are
available in the 8-lead MSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
®
1962 series are micropower, low noise, low
400
350
300
250
200
150
100
50
0
0
300mA, Low Noise,
50
U
Dropout Voltage
LOAD CURRENT (mA)
100
Final Electrical Specifications
LDO Regulators
150
RMS
Micropower
200
LT1962 Series
over a 10Hz to 100kHz
250
1962 TA02
300
April 2000
1

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LT1962 Summary of contents

Page 1

... A quiescent current makes them an ideal choice. Quiescent current is well controlled; it does not rise in dropout as it does with many other regulators. A key feature of the LT1962 regulators is low output noise. With the addition of an external 0.01 F bypass capacitor, output noise drops bandwidth. The LT1962 regulators are stable with output capacitors as low as 3 ...

Page 2

... U PACKAGE/ORDER I FOR ATIO OUT 1 SENSE/ADJ* 2 BYP 3 GND 4 8-LEAD PLASTIC MSOP *PIN 2: SENSE FOR LT1962-2.5/LT1962-3/ LT1962-3.3/LT1962-5. ADJ FOR LT1962 T = 150 C, JMAX SEE THE APPLICATIONS INFORMATION SECTION FOR ADDITIONAL INFORMATION ON THERMAL RESISTANCE Consult factory for Industrial and Military grade parts. = 3V, I ...

Page 3

... IN pin and OUT pin voltages. With the IN pin at 20V, the OUT pin may not be pulled below 0V. The total measured voltage from in to out can not exceed 20V. Note 3: The LT1962 regulators are tested and specified under pulse load conditions such that T T ...

Page 4

... ADJ (Pin 2): Adjust. For the adjustable LT1962, this is the input to the error amplifier. This pin is internally clamped to 7V. It has a bias current of 30nA which flows into the pin ...

Page 5

... In battery backup applications where the output can be held backup battery when the input is pulled to ground, the LT1962-X acts like it has a diode in series with its output and prevents reverse current flow. Additionally, in dual supply applications where the regulator load is re- ...

Page 6

... APPLICATIO S I FOR ATIO and provide improved transient response for larger load current changes. Bypass capacitors, used to decouple individual components powered by the LT1962, will in- crease the effective output capacitor value. With larger capacitors used to bypass the reference (for low noise operation), larger values of output capacitance are needed. ...

Page 7

... The device will protect both itself and the load. This provides protection against batteries which can be plugged in backward. The output of the LT1962 can be pulled below ground without damaging the device. If the input is left open circuit or grounded, the output can be pulled below ground by 20V ...

Page 8

... Current flow back into the output will follow the curve shown in Figure 6. When the IN pin of the LT1962 is forced below the OUT pin or the OUT pin is pulled above the IN pin, input current will typically drop to less than 2 A. This can happen if the input ...

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