LT1761 Series
100mA, Low Noise,
LDO Micropower
Regulators in TSOT-23
FEATURES
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DESCRIPTION
The LT
®
1761 series are micropower, low noise, low
dropout regulators. With an external 0.01μF bypass
capacitor, output noise drops to 20μV
RMS
over a 10Hz to
100kHz bandwidth. Designed for use in battery-powered
systems, the low 20μA quiescent current makes them an
ideal choice. In shutdown, quiescent current drops to less
than 0.1μA. The devices are capable of operating over an
input voltage from 1.8V to 20V, and can supply 100mA of
output current with a dropout voltage of 300mV. Quiescent
current is well controlled, not rising in dropout as it does
with many other regulators.
The LT1761 regulators are stable with output capacitors as
low as 1μF 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 device is available in fixed output
voltages of 1.2V, 1.5V, 1.8V, 2V, 2.5V, 2.8V, 3V, 3.3V and
5V, and as an adjustable device with a 1.22V reference
voltage. The LT1761 regulators are available in the 5-lead
TSOT-23 package.
L,
LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
Low Noise: 20μV
RMS
(10Hz to 100kHz)
Low Quiescent Current: 20μA
Wide Input Voltage Range: 1.8V to 20V
Output Current: 100mA
Very Low Shutdown Current: <0.1μA
Low Dropout Voltage: 300mV at 100mA
Fixed Output Voltages: 1.2V, 1.5V, 1.8V, 2V, 2.5V,
2.8V, 3V, 3.3V, 5V
Adjustable Output from 1.22V to 20V
Stable with 1μF Output Capacitor
Stable with Aluminum, Tantalum or
Ceramic Capacitors
Reverse-Battery Protected
No Reverse Current
No Protection Diodes Needed
Overcurrent and Overtemperature Protected
Available in Tiny 5-Lead TSOT-23 Package
APPLICATIONS
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Cellular Phones
Pagers
Battery-Powered Systems
Frequency Synthesizers
Wireless Modems
TYPICAL APPLICATION
10Hz to 100kHz Output Noise
5V Low Noise Regulator
V
IN
5.4V TO
20V
IN
1μF
SHDN
GND
OUT
LT1761-5
BYP
0.01μF
+
5V AT100mA
20μV
RMS
NOISE
10μF
1761 TA01
V
OUT
100μV/DIV
20μV
RMS
1761 TA01b
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LT1761 Series
ABSOLUTE MAXIMUM RATINGS
(Note 1)
IN Pin Voltage .........................................................±20V
OUT Pin Voltage ......................................................±20V
Input to Output Differential Voltage .........................±20V
ADJ Pin Voltage ...................................................... ±7V
BYP Pin Voltage .....................................................±0.6V
SHDN
Pin Voltage ................................................. ±20V
Output Short-Circuit Duration ........................ Indefinite
Operating Junction Temperature Range
E, I Grade (Note 2) ............................. –40°C to 125°C
MP Grade (Note 2) ............................. –55°C to 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
PIN CONFIGURATION
LT1761-BYP
IN 1
GND 2
BYP 3
4 ADJ
TOP VIEW
5 OUT
LT1761-SD
IN 1
GND 2
SHDN
3
4 ADJ
TOP VIEW
5 OUT
LT1761-X
IN 1
GND 2
SHDN
3
4 BYP
TOP VIEW
5 OUT
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
T
JMAX
= 150°C,
θ
JA
= 250°C/W
SEE APPLICATIONS INFORMATION SECTION
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
T
JMAX
= 150°C,
θ
JA
= 250°C/W
SEE APPLICATIONS INFORMATION SECTION
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
T
JMAX
= 150°C,
θ
JA
= 250°C/W
SEE APPLICATIONS INFORMATION SECTION
ORDER INFORMATION
LEAD FREE FINISH
LT1761ES5-BYP#PBF
LT1761IS5-BYP#PBF
LT1761ES5-SD#PBF
LT1761IS5-SD#PBF
LT1761ES5-1.2#PBF
LT1761IS5-1.2#PBF
LT1761ES5-1.5#PBF
LT1761IS5-1.5#PBF
LT1761ES5-1.8#PBF
LT1761IS5-1.8#PBF
LT1761MPS5-1.8#PBF
LT1761ES5-2#PBF
LT1761IS5-2#PBF
LT1761ES5-2.5#PBF
LT1761IS5-2.5#PBF
LT1761ES5-2.8#PBF
LT1761IS5-2.8#PBF
LT1761ES5-3#PBF
LT1761IS5-3#PBF
LT1761ES5-3.3#PBF
LT1761IS5-3.3#PBF
LT1761MPS5-3.3#PBF
TAPE AND REEL
LT1761ES5-BYP#TRPBF
LT1761IS5-BYP#TRPBF
LT1761ES5-SD#TRPBF
LT1761IS5-SD#TRPBF
LT1761ES5-1.2#TRPBF
LT1761IS5-1.2#TRPBF
LT1761ES5-1.5#TRPBF
LT1761IS5-1.5#TRPBF
LT1761ES5-1.8#TRPBF
LT1761IS5-1.8#TRPBF
LT1761MPS5-1.8#TRPBF
LT1761ES5-2#TRPBF
LT1761IS5-2#TRPBF
LT1761ES5-2.5#TRPBF
LT1761IS5-2.5#TRPBF
LT1761ES5-2.8#TRPBF
LT1761IS5-2.8#TRPBF
LT1761ES5-3#TRPBF
LT1761IS5-3#TRPBF
LT1761ES5-3.3#TRPBF
LT1761IS5-3.3#TRPBF
LT1761MPS5-3.3#TRPBF
PART MARKING *
LTGC
LTGC
LTGH
LTGH
LTCDS
LTCDS
LTMT
LTMT
LTJM
LTJM
LTDCH
LTJE
LTJE
LTGD
LTGD
LTLB
LTLB
LTGE
LTGE
LTGF
LTGF
LTGF
PACKAGE DESCRIPTION
5-Lead Plastic TSOT-23
5-Lead Plastic TSOT-23
5-Lead Plastic TSOT-23
5-Lead Plastic TSOT-23
5-Lead Plastic TSOT-23
5-Lead Plastic TSOT-23
5-Lead Plastic TSOT-23
5-Lead Plastic TSOT-23
5-Lead Plastic TSOT-23
5-Lead Plastic TSOT-23
5-Lead Plastic TSOT-23
5-Lead Plastic TSOT-23
5-Lead Plastic TSOT-23
5-Lead Plastic TSOT-23
5-Lead Plastic TSOT-23
5-Lead Plastic TSOT-23
5-Lead Plastic TSOT-23
5-Lead Plastic TSOT-23
5-Lead Plastic TSOT-23
5-Lead Plastic TSOT-23
5-Lead Plastic TSOT-23
5-Lead Plastic TSOT-23
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
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Medical Electronics
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