VideosDocumentationDatasheet
Application Note
Reliability Data
Product Selector Card
LT Journal
Press Release
cad_symbol
ltspice
Features
- Ultralow RMS Noise: 0.8μVRMS (10Hz to 100kHz)
- Ultralow Spot Noise: 2nV/√Hz at 10kHz
- Ultrahigh PSRR: 79dB at 1MHz
- Output Current: 200mA
- Wide Input Voltage Range: 1.8V to 20V
- Single Capacitor Improves Noise and PSRR
- 100μA SET Pin Current: ±1% Initial Accuracy
- Single Resistor Programs Output Voltage
- High Bandwidth: 1MHz
- Programmable Current Limit
- Low Dropout Voltage: 350mV
- Output Voltage Range: 0V to 15V
- Programmable Power Good
- Fast Start-Up Capability
- Precision Enable/UVLO
- Parallelable for Lower Noise and Higher Current
- Internal Current Limit with Foldback
- Minimum Output Capacitor: 4.7μF Ceramic
- Reverse Battery and Reverse Current Protection
- 10-Lead MSOP and 3mm × 3mm DFN Packages
Typical Application
Description
The LT®3042 is a high performance low dropout linear regulator featuring LTC’s ultralow noise and ultrahigh PSRR architecture for powering noise sensitive RF applications. Designed as a precision current reference followed by a high performance voltage buffer, the LT3042 can be easily paralleled to further reduce noise, increase output current and spread heat on the PCB.
The device supplies 200mA at a typical 350mV dropout voltage. Operating quiescent current is nominally 2mA and drops to <<1μA in shutdown. The LT3042’s wide output voltage range (0V to 15V) while maintaining unitygain operation provides virtually constant output noise, PSRR, bandwidth and load regulation, independent of the programmed output voltage. Additionally, the regulator features programmable current limit, fast start-up capability and programmable power good to indicate output voltage regulation.
The LT3042 is stable with a minimum 4.7μF ceramic output capacitor. Built-in protection includes reverse battery protection, reverse current protection, internal current limit with foldback and thermal limit with hysteresis. The LT3042 is available in thermally enhanced 10-Lead MSOP and 3mm × 3mm DFN packages.
3x3 DFN-10,MS-10E
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LT3042MPDD#PBF | DFN | 10 | MP | $8.29 | $5.80 |
| LT3042MPMSE#PBF | MSOP | 10 | MP | $8.29 | $5.80 |
| LT3042IMSE#TRPBF | MSOP | 10 | I | $2.56 | |
| LT3042EDD#TRPBF | DFN | 10 | E | $2.31 | |
| LT3042IDD#PBF | DFN | 10 | I | $3.57 | $2.50 |
| LT3042MPDD#TRPBF | DFN | 10 | MP | $5.86 | |
| LT3042IMSE#PBF | MSOP | 10 | I | $3.57 | $2.50 |
| LT3042EDD#PBF | DFN | 10 | E | $3.22 | $2.25 |
| LT3042HMSE#PBF | MSOP | 10 | H | $4.00 | $2.80 |
| LT3042EMSE#PBF | MSOP | 10 | E | $3.22 | $2.25 |
| LT3042MPMSE#TRPBF | MSOP | 10 | MP | $5.86 | |
| LT3042IDD#TRPBF | DFN | 10 | I | $2.56 | |
| LT3042HDD#TRPBF | DFN | 10 | H | $2.86 | |
| LT3042HMSE#TRPBF | MSOP | 10 | H | $2.86 | |
| LT3042HDD#PBF | DFN | 10 | H | $4.00 | $2.80 |
| LT3042EMSE#TRPBF | MSOP | 10 | E | $2.31 |
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 |
|---|---|---|---|
| DC2246A | LT3042EDD Demo Board | Ultralow Noise, Ultrahigh PSRR RF LDO Regulator, VIN = 3.8V to 20V, Vout = 3.3V @ 200mA | $150.00 | |
| DC2429A | LT3042 PLL/VCO Supply and Reference Board | $150.00 |