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Analog Devices Inc. LTC1550LCMS8#TRPBF
- Part No.:
- LTC1550LCMS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1550LCMS8#TRPBF.pdf
- Description:
- IC REG CHARG PUMP ADJ 20MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,694
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Product details
Overview
LTC1550LCMS8#TRPBF from Analog Devices (formerly Linear Technology) is a low-noise, switched-capacitor regulated negative voltage inverter with internal linear post-regulator, delivering –4.1V output at up to 20mA load current with <1mVP-P ripple. It operates from a single 4.5V–5.25V supply, features active-low TTL-compatible shutdown (SHDN), and is optimized for GaAs FET bias generation in portable RF transmitters.
For engineers reviewing the LTC1550LCMS8#TRPBF datasheet, LTC1550LCMS8#TRPBF pinout, LTC1550LCMS8#TRPBF application, or LTC1550LCMS8#TRPBF equivalent, key selection criteria include guaranteed ±2.5% output regulation over line/load/temperature, 900kHz charge pump frequency enabling compact 0.1µF external capacitors, and MSOP-8 package compatibility with space-constrained portable designs.
Technical Context
The LTC1550LCMS8#TRPBF integrates an inverting charge pump stage (900kHz oscillator, C1+/C1–/CPOUT pins) followed by a negative linear regulator (VOUT, REG, GND) that actively filters switching artifacts. Its N-channel MOSFET pass device enables low dropout-maintaining regulation down to VCC = 4.5V for –4.1V output.
Shutdown control is implemented via a high-impedance SHDN input (active-low), dropping quiescent current to 0.2µA typical. The fixed –4.1V output is set by internal resistor dividers; no external feedback components are required. Output stability mandates ≥10µF output capacitance with moderate ESR and star-ground layout for CIN, CPOUT, and COUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed –4.1V (±2.5% regulation over line, load, temperature) |
| Max Output Current | 20mA (guaranteed at VCC ≥ 4.75V, VOUT = –4.1V) |
| Output Ripple | <1mVP-P (with 10µF + 0.1µF ceramic output capacitor) |
| Supply Range | 4.5V to 5.25V (minimum VCC for –4.1V output) |
| Quiescent Current | 3.65mA typical (active mode, VCC = 5V); 0.2µA typical (shutdown) |
| Oscillator Frequency | 900kHz (enables use of 0.1µF ceramic flying capacitors) |
| Shutdown Threshold | Active-low SHDN: VIL ≤ 0.8V, VIH ≥ 2V (TTL-compatible) |
Pinout & Package
Package: 8-lead MSOP (MS8), 3.0mm × 3.0mm × 1.1mm body, exposed pad not connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REG) | Power-OK indicator output | Open-drain output pulled low when VOUT is within ±5% of –4.1V; requires external pull-up to VCC or higher (≤6V) |
| 2 (CPOUT) | Negative charge pump output | Intermediate node between charge pump and linear regulator; requires 0.1µF capacitor to GND with star-ground connection to minimize ripple |
| 3 (GND) | Analog/power ground reference | Common return for VOUT, CPOUT, and C1–; must connect directly to low-impedance ground plane |
| 4 (C1–) | Charge pump flying capacitor negative terminal | Connects to negative side of 0.1µF flying capacitor (C1); forms charge transfer path with C1+ |
| 5 (SHDN) | Active-low shutdown control | Drives internal charge pump and regulator into sleep mode when pulled low; high-impedance input, no internal pull-up |
| 6 (VCC) | Positive input supply | Accepts 4.5V–5.25V; requires ≥2.2µF low-ESR ceramic bypass capacitor placed adjacent to pin |
| 7 (C1+) | Charge pump flying capacitor positive terminal | Connects to positive side of 0.1µF flying capacitor (C1); alternately charged/discharged at 900kHz |
| 8 (VOUT) | Regulated negative output | Delivers –4.1V; requires ≥10µF output capacitor (moderate ESR) plus 0.1µF ceramic in parallel for stability and ripple suppression |
Key Features
| Feature | Design Value |
|---|---|
| Integrated linear post-regulator | Reduces charge pump ripple to <1mVP-P without external L-C filtering |
| 900kHz charge pump frequency | Enables use of standard 0.1µF ceramic flying capacitors; avoids IF band interference in RF systems |
| Fixed –4.1V output | Eliminates need for external feedback resistors-reduces BOM count and layout complexity |
| Active-low TTL-compatible SHDN | Reduces system standby power to 0.2µA; compatible with standard logic-level control signals |
| Guaranteed ±2.5% regulation | Maintains stable GaAs FET gate bias across temperature, supply, and load variations |
Applications
| GaAs FET Transmitter Bias | Portable RF Power Amplifier Supply |
|---|---|
Use Scenario: Generating precise negative gate bias for GaAs FETs in cellular handset power amplifiers. IC Role / Device Role / Timing Role: Regulated –4.1V voltage inverter providing stable gate control voltage independent of battery sag. Use Value: Enables consistent amplifier linearity and efficiency across 4.5V–5.25V Li-ion battery range with <1mVP-P noise. |
Use Scenario: Supplying clean negative rail for RF front-end ICs in Bluetooth/WiFi modules. IC Role / Device Role / Timing Role: Low-noise charge pump inverter with integrated linear regulation serving as local bias generator. Use Value: Eliminates need for discrete LDO + inverter stages, reducing footprint while meeting RF spectral purity requirements. |
| Single-Supply Instrumentation | Battery-Powered Test Equipment |
Use Scenario: Creating dual-rail supplies for op-amps and ADC drivers from a single Li-ion cell. IC Role / Device Role / Timing Role: Fixed-output negative voltage source enabling rail-to-rail analog signal conditioning. Use Value: Delivers –4.1V at 20mA with ±2.5% accuracy-sufficient for precision sensor interfaces without trimming. |
Use Scenario: Powering handheld oscilloscope front-ends requiring low-noise negative supply. IC Role / Device Role / Timing Role: Shutdown-enabled inverter minimizing quiescent draw during sleep mode. Use Value: Extends battery life via 0.2µA shutdown current while maintaining fast 1–5ms wake-up time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar negative voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1550LCS8-4.1 | Same electrical specs; SO-8 package (4.9mm × 3.9mm vs MSOP-8's 3.0mm × 3.0mm) | Less board area efficiency; higher thermal resistance (θJA = 135°C/W vs 150°C/W) | Select for legacy SO-8 layouts or where larger footprint is acceptable. |
| LTC1551LCMS8-4.1 | Identical except active-high SHDN (vs LTC1550LCMS8#TRPBF's active-low) | Requires inverted control signal; incompatible with existing active-low logic drive | Choose only if system-level control architecture uses active-high enable. |
Compared with LTC1550LCMS8#TRPBF, LTC1550LCS8-4.1 trades compactness for SO-8 compatibility, while LTC1551LCMS8-4.1 changes shutdown polarity-neither offers pin-to-pin replacement without schematic or firmware modification.
Availability
LTC1550LCMS8#TRPBF is available at Aetrix Electronics and suitable for GaAs FET bias generation, portable RF power amplifier supplies, and single-supply instrumentation requiring stable component supply and guaranteed –4.1V output regulation.
Supply support for LTC1550LCMS8#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017 and maintains its high-performance analog portfolio, emphasizing precision power management, signal conditioning, and RF solutions for demanding industrial and communications applications.
The LTC1550L series was designed specifically for low-noise negative bias generation in portable RF transmitters-prioritizing ultra-low ripple, small external component count, and robust regulation under dynamic load conditions.
FAQ
What is the minimum input voltage required for LTC1550LCMS8#TRPBF to deliver –4.1V output?
The LTC1550LCMS8#TRPBF requires a minimum VCC of 4.5V to guarantee –4.1V output regulation at full 20mA load. At lighter loads (≤5mA), operation down to 3.9V is possible per the Typical Performance Characteristics graph, but 4.5V is the specified minimum for guaranteed performance across temperature and process variation.
Can LTC1550LCMS8#TRPBF be used with ceramic output capacitors only?
Yes, LTC1550LCMS8#TRPBF requires a ≥10µF output capacitor with moderate ESR for loop stability; a 10µF X5R/X7R ceramic capacitor meets this requirement. However, adding a 0.1µF ceramic in parallel is strongly recommended to suppress high-frequency switching spikes and ensure <1mVP-P ripple.
Does LTC1550LCMS8#TRPBF require external feedback resistors for its –4.1V output?
No. LTC1550LCMS8#TRPBF is a fixed-output variant with internal resistor dividers setting the –4.1V regulation point. No external feedback components are needed-unlike adjustable versions (e.g., LTC1550LCMS8), which require ADJ pin connections.
What is the purpose of the REG pin on LTC1550LCMS8#TRPBF?
The REG pin on LTC1550LCMS8#TRPBF is an open-drain power-good indicator that pulls low when VOUT is within ±5% of –4.1V. It sinks up to 4mA and requires an external pull-up resistor (to VCC or up to 6V) to signal valid output voltage to system controllers.
How does the shutdown function behave on LTC1550LCMS8#TRPBF?
LTC1550LCMS8#TRPBF features an active-low SHDN pin: pulling it low disables the charge pump and linear regulator, collapsing VOUT to 0V and reducing supply current to 0.2µA typical. The pin has no internal pull-up, so a resistor or driver must hold it high during normal operation.
LTC1550LCMS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Negative
- Topology:
- Charge Pump
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -1.225V
- Voltage - Output (Max):
- -4.8V
- Current - Output:
- 20mA
- Frequency - Switching:
- 900kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LTC1550LCMS8#TRPBF FAQ
1.How can I place an order for LTC1550LCMS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1550LCMS8#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC1550LCMS8#TRPBF reliable?
The price and inventory of LTC1550LCMS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1550LCMS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1550LCMS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1550LCMS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1550LCMS8#TRPBF?
LTC1550LCMS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1550LCMS8#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC1550LCMS8#TRPBF?
For technical support, including LTC1550LCMS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1550LCMS8#TRPBF requirements.
6.How does Aetrix verify that LTC1550LCMS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1550LCMS8#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC1550LCMS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1550LCMS8#TRPBF?
All LTC1550LCMS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1550LCMS8#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC1550LCMS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1550LCMS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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