LT1761 - 100mA, Low Noise, LDO Micropower Regulators in TSOT-23
Datasheet 
DocumentationDatasheet
Application Note
Design Note
- DN220 - Lowest Noise SOT-23 LDOs Have 20µA Quiescent Current, 20µVrms Noise
- DN228 - Isolated RS485 Transceiver Breaks Ground Loops
- DN316 - Ultralow Noise Switching Power Supplies Simplify EMI Compliance
- DN367 - Tiny Versatile Buck Regulators Operate from 3.6V to 36V Input
Reliability Data
LT Journal
- Dec 2002 A Simple Solution to Low Noise, Isolated Power Conversion
- Jun 1999 Micropower LDO Has the Lowest Noise and Quiescent Current in SOT-23
- May 2004 Dual Regulators Offer Flexibility with Independent Shutdown Control and Adjustable Start-Up Timing
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Features
- 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
Typical Application
Description
The LT®1761 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.
SOT-23
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LT1761ES5-1.2#PBF | SOT | 5 | E | $1.21 | |
| LT1761ES5-1.2#TRMPBF | SOT | 5 | E | $1.21 | $0.97 |
| LT1761ES5-1.2#TRPBF | SOT | 5 | E | $1.21 | $0.95 |
| LT1761ES5-1.5#PBF | SOT | 5 | E | $1.21 | |
| LT1761ES5-1.5#TRMPBF | SOT | 5 | E | $1.21 | $0.97 |
| LT1761ES5-1.5#TRPBF | SOT | 5 | E | $1.21 | $0.95 |
| LT1761ES5-1.8#PBF | SOT | 5 | E | $1.21 | |
| LT1761ES5-1.8#TRMPBF | SOT | 5 | E | $1.21 | $0.97 |
| LT1761ES5-1.8#TRPBF | SOT | 5 | E | $1.21 | $0.95 |
| LT1761ES5-2#PBF | SOT | 5 | E | $1.21 | |
| LT1761ES5-2#TRMPBF | SOT | 5 | E | $1.21 | $0.97 |
| LT1761ES5-2#TRPBF | SOT | 5 | E | $1.21 | $0.95 |
| LT1761ES5-2.5#PBF | SOT | 5 | E | $1.21 | |
| LT1761ES5-2.5#TRMPBF | SOT | 5 | E | $1.21 | $0.97 |
| LT1761ES5-2.5#TRPBF | SOT | 5 | E | $1.21 | $0.95 |
| LT1761ES5-2.8#PBF | SOT | 5 | E | $1.21 | |
| LT1761ES5-2.8#TRMPBF | SOT | 5 | E | $1.21 | $0.97 |
| LT1761ES5-2.8#TRPBF | SOT | 5 | E | $1.21 | $0.95 |
| LT1761ES5-3#PBF | SOT | 5 | E | $1.21 | |
| LT1761ES5-3#TRMPBF | SOT | 5 | E | $1.21 | $0.97 |
| LT1761ES5-3#TRPBF | SOT | 5 | E | $1.21 | $0.95 |
| LT1761ES5-3.3#PBF | SOT | 5 | E | $1.21 | |
| LT1761ES5-3.3#TRMPBF | SOT | 5 | E | $1.21 | $0.97 |
| LT1761ES5-3.3#TRPBF | SOT | 5 | E | $1.21 | $0.95 |
| LT1761ES5-5#PBF | SOT | 5 | E | $1.10 | |
| LT1761ES5-5#TRMPBF | SOT | 5 | E | $1.21 | $0.97 |
| LT1761ES5-5#TRPBF | SOT | 5 | E | $1.10 | $0.95 |
| LT1761ES5-BYP#PBF | SOT | 5 | E | $1.10 | |
| LT1761ES5-BYP#TRMPBF | SOT | 5 | E | $1.21 | $0.97 |
| LT1761ES5-BYP#TRPBF | SOT | 5 | E | $1.10 | $0.95 |
| LT1761ES5-SD#PBF | SOT | 5 | E | $1.10 | |
| LT1761ES5-SD#TRMPBF | SOT | 5 | E | $1.21 | $0.97 |
| LT1761ES5-SD#TRPBF | SOT | 5 | E | $1.10 | $0.95 |
| LT1761IS5-1.2#PBF | SOT | 5 | I | $1.50 | |
| LT1761IS5-1.2#TRMPBF | SOT | 5 | I | $1.50 | $1.10 |
| LT1761IS5-1.2#TRPBF | SOT | 5 | I | $1.50 | $1.05 |
| LT1761IS5-1.5#PBF | SOT | 5 | I | $1.50 | |
| LT1761IS5-1.5#TRMPBF | SOT | 5 | I | $1.50 | $1.10 |
| LT1761IS5-1.5#TRPBF | SOT | 5 | I | $1.50 | $1.05 |
| LT1761IS5-1.8#PBF | SOT | 5 | I | $1.50 | |
| LT1761IS5-1.8#TRMPBF | SOT | 5 | I | $1.50 | $1.10 |
| LT1761IS5-1.8#TRPBF | SOT | 5 | I | $1.50 | $1.05 |
| LT1761IS5-2.5#PBF | SOT | 5 | I | $1.50 | |
| LT1761IS5-2.5#TRMPBF | SOT | 5 | I | $1.50 | $1.10 |
| LT1761IS5-2.5#TRPBF | SOT | 5 | I | $1.50 | $1.05 |
| LT1761IS5-2.8#PBF | SOT | 5 | I | $1.50 | |
| LT1761IS5-2.8#TRMPBF | SOT | 5 | I | $1.50 | $1.10 |
| LT1761IS5-2.8#TRPBF | SOT | 5 | I | $1.50 | $1.05 |
| LT1761IS5-3#PBF | SOT | 5 | I | $1.50 | |
| LT1761IS5-3#TRMPBF | SOT | 5 | I | $1.50 | $1.10 |
| LT1761IS5-3#TRPBF | SOT | 5 | I | $1.50 | $1.05 |
| LT1761IS5-3.3#PBF | SOT | 5 | I | $1.50 | |
| LT1761IS5-3.3#TRMPBF | SOT | 5 | I | $1.50 | $1.10 |
| LT1761IS5-3.3#TRPBF | SOT | 5 | I | $1.50 | $1.05 |
| LT1761IS5-5#PBF | SOT | 5 | I | $1.50 | |
| LT1761IS5-5#TRMPBF | SOT | 5 | I | $1.50 | $1.10 |
| LT1761IS5-5#TRPBF | SOT | 5 | I | $1.50 | $1.05 |
| LT1761IS5-BYP#PBF | SOT | 5 | I | $1.50 | |
| LT1761IS5-BYP#TRMPBF | SOT | 5 | I | $1.50 | $1.10 |
| LT1761IS5-BYP#TRPBF | SOT | 5 | I | $1.50 | $1.05 |
| LT1761IS5-SD#PBF | SOT | 5 | I | $1.50 | |
| LT1761IS5-SD#TRMPBF | SOT | 5 | I | $1.50 | $1.10 |
| LT1761IS5-SD#TRPBF | SOT | 5 | I | $1.50 | $1.05 |
| LT1761MPS5-1.8#TRMPBF | SOT | 5 | MP | $2.51 | $1.81 |
| LT1761MPS5-1.8#TRPBF | SOT | 5 | MP | $2.51 | $1.76 |
| LT1761MPS5-3.3#PBF | SOT | 5 | MP | $2.51 | |
| LT1761MPS5-3.3#TRMPBF | SOT | 5 | MP | $2.51 | $1.81 |
| LT1761MPS5-3.3#TRPBF | SOT | 5 | MP | $2.51 | $1.76 |
| LT1761MPS5-5#PBF | SOT | 5 | MP | $2.51 | |
| LT1761MPS5-5#TR | SOT | 5 | MP | $2.51 | $1.76 |
| LT1761MPS5-5#TRMPBF | SOT | 5 | MP | $2.51 | $1.81 |
| LT1761MPS5-5#TRPBF | SOT | 5 | MP | $2.51 | $1.76 |
| LT1761IS5-2#PBF | SOT | 5 | I | $1.50 | |
| LT1761IS5-2#TRPBF | SOT | 5 | I | $1.50 | $1.05 |
| LT1761IS5-2#TRMPBF | SOT | 5 | I | $1.50 | $1.10 |
| LT1761MPS5-5#TRM | SOT | 5 | MP | $2.51 | $1.81 |
| LT1761MPS5-3.3#TRM | SOT | 5 | MP | $2.51 | $1.81 |
| LT1761MPS5-3.3 | SOT | 5 | MP | $2.51 | |
| LT1761ES5-1.8#TR | SOT | 5 | E | $2.42 | $1.90 |
| LT1761ES5-2 | SOT | 5 | E | $2.42 | |
| LT1761ES5-2#TR | SOT | 5 | E | $2.42 | $1.90 |
| LT1761ES5-2.5 | SOT | 5 | E | $2.42 | |
| LT1761ES5-2.5#TR | SOT | 5 | E | $2.42 | $1.90 |
| LT1761ES5-2.8 | SOT | 5 | E | $2.42 | |
| LT1761ES5-2.8#TR | SOT | 5 | E | $2.42 | $1.90 |
| LT1761ES5-3 | SOT | 5 | E | $2.42 | |
| LT1761ES5-3#TR | SOT | 5 | E | $2.42 | $1.90 |
| LT1761ES5-3.3 | SOT | 5 | E | $2.42 | |
| LT1761ES5-3.3#TR | SOT | 5 | E | $2.42 | $1.90 |
| LT1761ES5-5 | SOT | 5 | E | $2.20 | |
| LT1761ES5-5#TR | SOT | 5 | E | $2.20 | $1.90 |
| LT1761ES5-BYP | SOT | 5 | E | $2.20 | |
| LT1761ES5-BYP#TR | SOT | 5 | E | $2.20 | $1.90 |
| LT1761ES5-SD | SOT | 5 | E | $2.20 | |
| LT1761ES5-SD#TR | SOT | 5 | E | $2.20 | $1.90 |
| LT1761ES5-1.5 | SOT | 5 | E | $2.42 | |
| LT1761ES5-1.5#TR | SOT | 5 | E | $2.42 | $1.90 |
| LT1761ES5-1.2 | SOT | 5 | E | $2.42 | |
| LT1761ES5-1.2#TRM | SOT | 5 | E | $2.42 | $1.94 |
| LT1761ES5-1.5#TRM | SOT | 5 | E | $2.42 | $1.94 |
| LT1761ES5-1.8#TRM | SOT | 5 | E | $2.42 | $1.94 |
| LT1761ES5-2#TRM | SOT | 5 | E | $2.42 | $1.94 |
| LT1761ES5-2.5#TRM | SOT | 5 | E | $2.42 | $1.94 |
| LT1761ES5-2.8#TRM | SOT | 5 | E | $2.42 | $1.94 |
| LT1761ES5-3#TRM | SOT | 5 | E | $2.42 | $1.94 |
| LT1761ES5-3.3#TRM | SOT | 5 | E | $2.42 | $1.94 |
| LT1761ES5-5#TRM | SOT | 5 | E | $2.42 | $1.94 |
| LT1761ES5-BYP#TRM | SOT | 5 | E | $2.42 | $1.94 |
| LT1761ES5-SD#TRM | SOT | 5 | E | $2.42 | $1.94 |
| LT1761IS5-BYP#TRM | SOT | 5 | I | $3.00 | $2.20 |
| LT1761IS5-5#TRM | SOT | 5 | I | $3.00 | $2.20 |
| LT1761IS5-3.3#TRM | SOT | 5 | I | $3.00 | $2.20 |
| LT1761IS5-3#TRM | SOT | 5 | I | $3.00 | $2.20 |
| LT1761MPS5-3.3#TR | SOT | 5 | MP | $2.51 | $1.76 |
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC330A | LT1761ES5-BYP/SD Demo Board | 2 Circuits: Low Output Noise and Low Current Shutdown, 2.3V ≤ VIN ≤ 20V, Vout = 1.22/1.8/2.0/2.5/2.8/3.0/3.3/5.0V @ 100mA | $75.00 |