The LT1761 series are micropower, low noise, low dropout regulators. With an external 0.01μF bypass capacitor, output noise drops to 20μVRMS 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.
Key Features and Benefits
- • Low Noise: 20μVRMS (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
- • Cellular Phones
- • Pagers
- • Battery-Powered Systems
- • Frequency Synthesizers
- • Wireless Modems
Blocks and Diagrams
Product Technical Specifications
EU RoHS
Not Compliant
ECCN (US)
EAR99
Part Status
Obsolete
HTS
8542.39.00.90
SVHC
Yes
SVHC Exceeds Threshold
Yes
Automotive
No
PPAP
No
Type
LDO
Number of Outputs
1
Polarity
Positive
Accuracy (%)
±1.5(Typ)
Output Type
Adjustable
Output Voltage (V)
1.22 to 20
Maximum Output Current (A)
0.1
Minimum Input Voltage (V)
1.8
Maximum Input Voltage (V)
20
Maximum Dropout Voltage @ Current (V)
0.15@1mA|0.22@10mA|0.28@50mA|0.35@100mA
Reference Voltage (V)
1.22
Line Regulation
10mV
Load Regulation
12mV
Typical Ground Current @ Full Load (mA)
2.2
Junction to Ambient
250°C/W
Special Features
Current Limit|Reverse Battery Protection|Reverse Current Protection|Shutdown|Thermal Protection
Minimum Operating Temperature (°C)
-40
Maximum Operating Temperature (°C)
125
Supplier Temperature Grade
Extended
Packaging
Tape and Reel
Mounting
Surface Mount
Package Height
0.9(Max) mm
Package Width
1.75(Max) mm
Package Length
2.9 mm
PCB changed
5
Standard Package Name
SOT
Supplier Package
TSOT-23
Pin Count
5
Lead Shape
Gull-wing