FEATURES
■Low Noise: 20 VRMS (10Hz to 100kHz)
■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
APPLICATIOUS
■Cellular Phones
■Battery-Powered Systems
■Noise-Sensitive Instrumentation Systems
Final Electrical Specifications
LT1962 Series
300mA, Low Noise,
Micropower
LDO Regulators
April 2000
DESCRIPTIOU
The LT®1962 series are micropower, low noise, low 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 VRMS over a 10Hz to 100kHz 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 protection, current limiting, thermal limiting and reverse current protection. The parts come in fixed output voltages 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.
TYPICAL APPLICATIOU
3.3V Low Noise Regulator
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IN |
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OUT |
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3.3V AT 300mA |
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VIN |
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+ |
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20 VRMS NOISE |
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3.7V TO |
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1 F |
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SENSE |
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10 |
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20V |
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F |
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LT1962-3.3 |
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BYP |
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0.01 |
F |
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SHDN |
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GND |
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1962 TA01 |
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Dropout Voltage
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400 |
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(mV) |
350 |
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300 |
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VOLTAGE |
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250 |
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DROPOUT |
200 |
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100 |
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150 |
50
0
0 |
50 |
100 |
150 |
200 |
250 |
300 |
LOAD CURRENT (mA)
1962 TA02
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- 1 tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
LT1962 Series
ABSOLUTE WAXIWUW RATIUGS
(Note 1)
IN Pin Voltage ........................................................ |
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±20V |
OUT Pin Voltage .................................................... |
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±20V |
Input to Output Differential Voltage (Note 2) |
......... ±20V |
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SENSE Pin Voltage ............................................... |
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±20V |
ADJ Pin Voltage ...................................................... |
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±7V |
BYP Pin Voltage.................................................... |
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±0.6V |
SHDN Pin Voltage ................................................. |
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±20V |
Output Short-Circut Duration.......................... |
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Indefinite |
Operating Junction Temperature Range |
– 40°C to 125°C |
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(Note 3) ............................................ |
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Storage Temperature Range ................. |
– 65°C to 150°C |
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Lead Temperature (Soldering, 10 sec).................. |
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300°C |
PACKAGE/ORDER IUFORWATIOU
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ORDER PART |
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NUMBER |
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TOP VIEW |
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LT1962EMS8 |
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OUT |
1 |
8 IN |
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LT1962EMS8-2.5 |
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SENSE/ADJ* |
2 |
7 NC |
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BYP |
3 |
6 NC |
LT1962EMS8-3 |
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GND |
4 |
5 |
SHDN |
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MS8 PACKAGE |
LT1962EMS8-3.3 |
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8-LEAD PLASTIC MSOP |
LT1962EMS8-5 |
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*PIN 2: SENSE FOR LT1962-2.5/LT1962-3/ |
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MS8 PART MARKING |
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LT1962-3.3/LT1962-5. ADJ FOR LT1962 |
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TJMAX = 150°C, θJA = 125°C/ W |
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LTML |
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SEE THE APPLICATIONS |
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LTPT |
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INFORMATION SECTION |
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FOR ADDITIONAL |
LTPQ |
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INFORMATION ON |
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THERMAL RESISTANCE |
LTPS |
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LTPR |
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Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. (Note 3)
PARAMETER |
CONDITIONS |
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MIN |
TYP |
MAX |
UNITS |
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Minimum Operating Voltage |
ILOAD = 300mA |
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1.8 |
2.3 |
V |
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Regulated Output Voltage |
LT1962-2.5 |
VIN = 3V, ILOAD = 1mA |
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2.475 |
2.500 |
2.525 |
V |
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(Note 5) |
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3.5V < VIN < 20V, 1mA < ILOAD < 300mA |
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2.435 |
2.500 |
2.565 |
V |
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LT1962-3 VIN = 3.5V, ILOAD = 1mA |
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2.970 |
3.000 |
3.030 |
V |
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4V < VIN < 20V, 1mA < ILOAD < 300mA |
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2.925 |
3.000 |
3.075 |
V |
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LT1962-3.3 VIN = 3.8V, ILOAD = 1mA |
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3.267 |
3.300 |
3.333 |
V |
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4.3V < VIN < 20V, 1mA < ILOAD < 300mA |
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3.220 |
3.300 |
3.380 |
V |
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LT1962-5 VIN = 5.5V, ILOAD = 1mA |
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4.950 |
5.000 |
5.050 |
V |
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6V < VIN < 20V, 1mA < ILOAD < 300mA |
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4.875 |
5.000 |
5.125 |
V |
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ADJ Pin Voltage |
LT1962 |
VIN = 2V, ILOAD = 1mA |
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1.208 |
1.220 |
1.232 |
V |
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(Notes 4, 5) |
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2.3V < VIN < 20V, 1mA < ILOAD < 300mA |
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1.190 |
1.220 |
1.250 |
V |
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Line Regulation |
LT1962-2.5 |
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VIN = 3V to 20V, ILOAD = 1mA |
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1 |
5 |
mV |
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LT1962-3 |
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VIN = 3.5V to 20V, ILOAD = 1mA |
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1 |
5 |
mV |
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LT1962-3.3 |
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VIN = 3.8V to 20V, ILOAD = 1mA |
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1 |
5 |
mV |
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LT1962-5 |
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VIN = 5.5V to 20V, ILOAD = 1mA |
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1 |
5 |
mV |
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LT1962 (Note 4) |
VIN = 2V to 20V, ILOAD = 1mA |
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1 |
5 |
mV |
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Load Regulation |
LT1962-2.5 |
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VIN = 3.5V, ILOAD = 1mA to 300mA |
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5 |
12 |
mV |
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VIN = 3.5V, ILOAD = 1mA to 300mA |
● |
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25 |
mV |
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LT1962-3 |
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VIN = 4V, ILOAD = 1mA to 300mA |
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7 |
15 |
mV |
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VIN = 4V, ILOAD = 1mA to 300mA |
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30 |
mV |
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LT1962-3.3 |
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VIN = 4.3V, ILOAD = 1mA to 300mA |
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7 |
17 |
mV |
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VIN = 4.3V, ILOAD = 1mA to 300mA |
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33 |
mV |
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LT1962-5 |
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VIN = 6V, ILOAD = 1mA to 300mA |
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12 |
25 |
mV |
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VIN = 6V, ILOAD = 1mA to 300mA |
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50 |
mV |
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LT1962 (Note 4) |
VIN = 2.3V, ILOAD = 1mA to 300mA |
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2 |
6 |
mV |
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VIN = 2.3V, ILOAD = 1mA to 300mA |
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12 |
mV |
2
LT1962 Series
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. (Note 2)
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PARAMETER |
CONDITIONS |
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MIN |
TYP |
MAX |
UNITS |
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Dropout Voltage |
ILOAD = 10mA |
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0.10 |
0.15 |
V |
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VIN = VOUT(NOMINAL) |
ILOAD = 10mA |
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● |
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0.21 |
V |
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(Notes 6, 7) |
ILOAD = 50mA |
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0.15 |
0.20 |
V |
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ILOAD = 50mA |
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● |
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0.28 |
V |
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ILOAD = 100mA |
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0.18 |
0.24 |
V |
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ILOAD = 100mA |
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● |
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0.33 |
V |
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ILOAD = 300mA |
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0.27 |
0.33 |
V |
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ILOAD = 300mA |
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● |
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0.43 |
V |
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GND Pin Current |
ILOAD = 0mA |
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● |
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30 |
75 |
µA |
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VIN = VOUT(NOMINAL) |
ILOAD = 1mA |
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● |
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65 |
120 |
µA |
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(Notes 6, 8) |
ILOAD = 50mA |
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● |
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1.1 |
1.6 |
mA |
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ILOAD = 100mA |
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● |
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2 |
3 |
mA |
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ILOAD = 300mA |
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● |
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8 |
12 |
mA |
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Output Voltage Noise |
COUT = 10µF, CBYP = 0.01µF, ILOAD = 300mA, BW = 10Hz to 100kHz |
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20 |
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µVRMS |
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ADJ Pin Bias Current |
(Notes 4, 9) |
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30 |
100 |
nA |
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Shutdown Threshold |
VOUT = Off to On |
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0.8 |
2 |
V |
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VOUT = On to Off |
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0.25 |
0.65 |
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V |
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V |
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= 0V |
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0.01 |
0.5 |
µA |
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SHDN |
Pin Current |
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SHDN |
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(Note 10) |
V |
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= 20V |
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1 |
5 |
µA |
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SHDN |
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Quiescent Current in Shutdown |
VIN = 6V, V |
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= 0V |
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0.1 |
1 |
µA |
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SHDN |
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Ripple Rejection |
VIN – VOUT = 1.5V (Avg), VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz, |
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55 |
65 |
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dB |
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ILOAD = 300mA |
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Current Limit |
VIN = 7V, VOUT = 0V |
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700 |
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mA |
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VIN = VOUT(NOMINAL) + 1V, VOUT = – 0.1V |
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320 |
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mA |
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Input Reverse Leakage Current |
VIN = – 20V, VOUT = 0V |
● |
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1 |
mA |
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Reverse Output Current |
LT1962-2.5 |
VOUT = 2.5V, VIN < 2.5V |
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10 |
20 |
µA |
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(Note 11) |
LT1962-3 |
VOUT = 3V, VIN < 3V |
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10 |
20 |
µA |
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LT1962-3.3 |
VOUT = 3.3V, VIN < 3.3V |
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10 |
20 |
µA |
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LT1962-5 |
VOUT = 5V, VIN < 5V |
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10 |
20 |
µA |
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LT1962 (Note 4) VOUT = 1.22V, VIN < 1.22V |
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5 |
10 |
µA |
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Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
Note 2: Absolute maximum input to output differential voltage can not be achieved with all combinations of rated 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 TJ ≈ TA. The LT1962 is 100% tested at TA = 25°C. Performance at – 40°C and 125°C is assured by design, characterization and correlation with statistical process controls.
Note 4: The LT1962 (adjustable version) is tested and specified for these conditions with the ADJ pin connected to the OUT pin.
Note 5: Operating conditions are limited by maximum junction temperature. The regulated output voltage specification will not apply for all possible combinations of input voltage and output current. When operating at maximum input voltage, the output current range must be limited. When operating at maximum output current, the input voltage range must be limited.
Note 6: To satisfy requirements for minimum input voltage, the LT1962 (adjustable version) is tested and specified for these conditions with an external resistor divider (two 250k resistors) for an output voltage of 2.44V. The external resistor divider will add a 5µA DC load on the output.
Note 7: Dropout voltage is the minimum input to output voltage differential needed to maintain regulation at a specified output current. In dropout, the output voltage will be equal to: VIN – VDROPOUT.
Note 8: GND pin current is tested with VIN = VOUT(NOMINAL) and a current source load. This means the device is tested while operating in its dropout
region. This is the worst-case GND pin current. The GND pin current will decrease slightly at higher input voltages.
Note 9: ADJ pin bias current flows into the ADJ pin.
Note 10: SHDN pin current flows into the SHDN pin. This current is included in the specification for GND pin current.
Note 11: Reverse output current is tested with the IN pin grounded and the OUT pin forced to the rated output voltage. This current flows into the OUT pin and out the GND pin.
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