LT1762 Series
150mA, Low Noise, LDO
Micropower Regulators
FEATURES DESCRIPTION
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Low Noise: 20V (10Hz to 100kHz) The LT 1762 series are micropower, low noise, low
RMS
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Low Quiescent Current: 25A dropout regulators. The devices are capable of supply-
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Wide Input Voltage Range: 1.8V to 20V ing 150mA of output current with a dropout voltage of
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Output Current: 150mA 270mV. Designed for use in battery-powered systems, the
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Very Low Shutdown Current: < 1A low 25A quiescent current makes them an ideal choice.
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Low Dropout Voltage: 270mV Quiescent current is well controlled; it does not rise in
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No Protection Diodes Needed dropout as it does with many other regulators.
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Fixed Output Voltages: 2.5V, 3V, 3.3V, 5V
A key feature of the LT1762 regulators is low output noise.
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Adjustable Output from 1.22V to 20V
With the addition of an external 0.01F bypass capacitor,
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Stable with 2.2F Output Capacitor
output noise drops to 20V over a 10Hz to 100kHz
RMS
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Stable with Aluminum, Tantalum or Ceramic
bandwidth. The LT1762 regulators are stable with output
Capacitors
capacitors as low as 2.2F. Small ceramic capacitors can
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Reverse Battery Protection
be used without the series resistance required by other
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No Reverse Current
regulators.
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Overcurrent and Overtemperature Protected
n Internal protection circuitry includes reverse battery pro-
8-Lead MSOP Package
tection, current limiting, thermal limiting and reverse cur-
rent protection. The parts come in fixed output voltages
APPLICATIONS
of 2.5V, 3V, 3.3V and 5V, and as an adjustable device
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Cellular Phones
with a 1.22V reference voltage. The LT1762 regulators
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Battery-Powered Systems
are available in the 8-lead MSOP package.
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Frequency Synthesizers All registered trademarks and trademarks are the property of their respective owners.
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Noise-Sensitive Instrumentation Systems
TYPICAL APPLICATION
3.3V Low Noise Regulator Dropout Voltage
400
3.3V AT 150mA
IN OUT
V 20V NOISE
IN + RMS
350
3.7V TO SENSE
1F
10F
20V
LT1762-3.3
0.01F
300
SHDN
BYP
250
GND
1762 TA01a
200
150
100
50
0
0 20 40 60 80 100 120 140 160
OUTPUT CURRENT (mA)
1762 TA01b
Rev B
1
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DROPOUT VOLTAGE (mV)LT1762 Series
ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION
(Note 1)
IN Pin Voltage .........................................................20V
OUT Pin Voltage ......................................................20V
Input to Output Differential Voltage ........................20V
TOP VIEW
SENSE Pin Voltage ................................................ 20V
OUT 1 8 IN
SENSE/ADJ* 2 7 NC
ADJ Pin Voltage ...................................................... 7V
6 NC
BYP 3
GND 4 5 SHDN
BYP Pin Voltage .....................................................0.6V
MS8 PACKAGE
SHDN Pin Voltage ................................................. 20V
8-LEAD PLASTIC MSOP
Output Short-Circuit Duration ........................ Indefinite T = 150C, = 125C/W
JMAX JA
*PIN 2: SENSE FOR LT1762-2.5/LT1762-3/LT1762-3.3/LT1762-5 AND ADJ FOR LT1762
Operating Junction Temperature Range
SEE THE APPLICATIONS SECTION.
(Note 2) ............................................. 40C to 125C
Storage Temperature Range .................. 65C to 150C
Lead Temperature (Soldering, 10 sec) ...................300C
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT1762EMS8#PBF LT1762EMS8#TRPBF LTHF 8-Lead Plastic MSOP 40C to 125C
LT1762EMS8-2.5#PBF LT1762EMS8-2.5#TRPBF LTHG 8-Lead Plastic MSOP 40C to 125C
LT1762EMS8-3#PBF LT1762EMS8-3#TRPBF LTHH 8-Lead Plastic MSOP 40C to 125C
LT1762EMS8-3.3#PBF LT1762EMS8-3.3#TRPBF LTHJ
8-Lead Plastic MSOP 40C to 125C
LT1762EMS8-5#PBF LT1762EMS8-5#TRPBF LTHK
8-Lead Plastic MSOP 40C to 125C
Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
Rev B
2
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