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Analog Devices Inc. LTC1551LCMS8-4.1#PBF
- Part No.:
- LTC1551LCMS8-4.1#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1551LCMS8-4.1#PBF.pdf
- Description:
- IC REG CHARGE PUMP -4.1V 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,663
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Product details
Overview
LTC1551LCMS8-4.1#PBF from Analog Devices (formerly Linear Technology) is a fixed-output, switched-capacitor negative voltage inverter with integrated linear post-regulator, delivering –4.1V at up to 20mA load current with <1mVP-P output ripple. It operates from a single 4.5V–5.25V supply, features active-high TTL-compatible shutdown (SHDN), and is optimized for GaAs FET bias generation in portable RF transmitters.
For engineers reviewing the LTC1551LCMS8-4.1#PBF datasheet, LTC1551LCMS8-4.1#PBF pinout, LTC1551LCMS8-4.1#PBF application, or LTC1551LCMS8-4.1#PBF equivalent, key selection criteria include guaranteed ±2.5% output regulation over line/load/temperature, 900kHz charge pump frequency, MSOP-8 package compatibility, and low-quiescent-current shutdown mode (<1µA).
Technical Context
The LTC1551LCMS8-4.1#PBF integrates a 900kHz inverting charge pump stage followed by a negative linear regulator using an N-channel MOSFET pass device and internal 1.225V reference. Its feedback loop is optimized for fast transient response to suppress switching artifacts from CPOUT, enabling stable regulation under dynamic loads.
Unlike adjustable variants, this fixed –4.1V version uses internal resistor dividers and omits the ADJ pin. The SHDN pin is active-high-pulling it to VCC enables operation; pulling it to GND forces shutdown with 0.2µA typical quiescent current and output collapse to 0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed –4.1V, regulated to ±2.5% over line, load (0–20mA), and temperature (0°C to 70°C) |
| Supply Range | 4.5V to 5.25V minimum input required-ensures stable –4.1V output at full 20mA load |
| Output Ripple | <1mVP-P typical with 10µF + 0.1µF ceramic output capacitor-meets low-noise RF bias requirements |
| Charge Pump Freq | 900kHz-places switching energy outside 400–600kHz IF bands used in cellular radios |
| Shutdown Current | 0.2µA typical-enables ultra-low-power standby in battery-operated portable systems |
| Quiescent Current | 3.65mA typical at 5V supply-supports efficient operation without external LDO pre-regulation |
| Package | 8-lead MSOP (3mm × 3mm)-enables compact layout in space-constrained handheld PCBs |
Pinout & Package
Package: 8-lead MSOP (Moisture Sensitivity Level 1, Pb-free, RoHS-compliant). Pin pitch: 0.5mm. Body dimensions: 3.0mm × 3.0mm × 0.85mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REG) | Power-Valid Open-Drain Output | Pulls low when VOUT is within ±5% of –4.1V; requires external pull-up to monitor regulation status |
| 2 (CPOUT) | Negative Charge Pump Output | Supplies input to linear regulator; requires 0.1µF capacitor to GND with star-grounded connection |
| 3 (GND) | Analog & Power Ground | Single ground pin serving both analog and power return paths-must connect to low-impedance ground plane |
| 4 (C1–) | Charge Pump Flying Capacitor Negative Terminal | Completes charge transfer path with C1+; connects to 0.1µF flying capacitor |
| 5 (SHDN) | Active-High Shutdown Control | High = normal operation; low = shutdown (0.2µA IQ, VOUT → 0V); no internal pull-down-external logic must drive |
| 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 same 0.1µF flying capacitor as C1–; forms charge-transfer pair with CPOUT |
| 8 (VOUT) | Regulated Negative Output | Delivers –4.1V; requires ≥10µF output capacitor (tantalum + 0.1µF ceramic) for stability and ripple suppression |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Linear Post-Regulator | Eliminates need for external LDO, reducing BOM count and PCB area while achieving <1mVP-P ripple |
| 900kHz Switching Frequency | Enables use of standard 0.1µF ceramic flying capacitors and avoids interference with common RF IF bands |
| Four-External-Component Operation | Requires only input bypass (2.2µF), two 0.1µF flying caps, and output filter (10µF + 0.1µF)-minimizes design complexity |
| Active-High Shutdown | Simplifies interface with microcontroller GPIOs or system power sequencers without level-shifting |
| Guaranteed Regulation at 20mA | Maintains ±2.5% accuracy across full operating temperature range-validates use in production RF front-end bias rails |
Applications
| GaAs FET Transmitter Bias | Negative Rail Generation |
|---|---|
Use Scenario: Providing stable –4.1V gate bias to GaAs FETs in 2G/3G cellular handset power amplifiers. IC Role / Device Role / Timing Role: Fixed-output negative voltage inverter with linear post-regulation ensures clean, ripple-free bias independent of RF modulation envelope. Use Value: Enables consistent PA gain and efficiency across battery discharge cycle without requiring external filtering or trimming. | Use Scenario: Generating isolated negative supply for op-amp dual-rail operation in portable instrumentation. IC Role / Device Role / Timing Role: Compact, low-noise inverter replacing discrete charge-pump + LDO solutions in space-constrained designs. Use Value: Reduces component count by 4–6 parts and eliminates layout-sensitive compensation networks. |
| Battery-Powered RF Modules | Single-Supply Signal Conditioning |
Use Scenario: Biasing mixer diodes and LO buffers in Bluetooth/WiFi modules powered from 3.7V Li-ion cells. IC Role / Device Role / Timing Role: Delivers regulated –4.1V from boosted 5V rail with fast turn-on (<5ms) and sub-µA shutdown current. Use Value: Extends battery life during sleep modes while ensuring rapid RF subsystem readiness on wake-up. | Use Scenario: Enabling true bipolar signal swing in sensor front-ends powered from single 5V supply. IC Role / Device Role / Timing Role: Supplies clean negative rail to op-amps driving ADC inputs or precision DAC references. Use Value: Prevents clipping and distortion in AC-coupled measurement paths without adding noise-prone switching regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar negative voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1550LCMS8-4.1#PBF | Identical functionality but active-low SHDN pin; otherwise identical electrical specs and pinout | Requires inverted control signal-unsuitable where host MCU lacks open-drain or inverting logic | Select when system-level shutdown logic is active-low or when interoperability with legacy LTC1550L-based designs is required |
| LTC1261LCS8-4.1#PBF | Lower max output current (15mA vs 20mA); higher typical output ripple (2mVP-P); no REG pin | Lacks power-valid indication and reduced load capability-less suitable for high-efficiency PA bias under full load | Consider only for cost-sensitive, lower-current applications where REG monitoring is unnecessary |
Compared with LTC1550LCMS8-4.1#PBF, the LTC1551LCMS8-4.1#PBF simplifies control interface via active-high SHDN, while versus LTC1261LCS8-4.1#PBF it delivers higher output current and tighter ripple performance critical for RF bias stability.
Availability
LTC1551LCMS8-4.1#PBF is available at Aetrix Electronics and suitable for GaAs FET bias generation, portable RF module power supplies, and single-supply signal conditioning requiring stable component supply and guaranteed long-term manufacturability.
Supply support for LTC1551LCMS8-4.1#PBF 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 full product support, manufacturing, and documentation for the LTC portfolio.
The LTC1550L/LTC1551L family was designed specifically for low-noise, high-efficiency negative voltage generation in portable wireless infrastructure-emphasizing minimal external components, RF-friendly switching frequency, and robust regulation under dynamic loads.
FAQ
What is the minimum input voltage required for LTC1551LCMS8-4.1#PBF to deliver –4.1V at 20mA?
The LTC1551LCMS8-4.1#PBF requires a minimum VCC of 4.75V to maintain –4.1V output regulation at 20mA load, as specified in the Electrical Characteristics table. Below this, output voltage droops beyond ±2.5% tolerance. This reflects the combined dropout of the charge pump and linear regulator stages.
Does LTC1551LCMS8-4.1#PBF require external resistors to set the output voltage?
No. The LTC1551LCMS8-4.1#PBF is a fixed-output variant with internal resistor dividers configured for –4.1V. External resistors are only required for adjustable versions (e.g., LTC1551LCMS8#PBF with ADJ pin). No external feedback network is needed for this part.
Can LTC1551LCMS8-4.1#PBF be used with a 3.3V input supply?
No. The LTC1551LCMS8-4.1#PBF is not rated for 3.3V operation. Its absolute minimum VCC for –4.1V output is 4.5V, and full 20mA regulation requires ≥4.75V. Using 3.3V will result in failure to regulate or complete output collapse.
What is the purpose of the REG pin on LTC1551LCMS8-4.1#PBF?
On the LTC1551LCMS8-4.1#PBF, the REG pin is an open-drain output that pulls low when VOUT is within ±5% of –4.1V. It sinks up to 4mA and requires an external pull-up resistor to monitor power-good status-enabling system-level fault detection and sequencing control.
How does the shutdown behavior of LTC1551LCMS8-4.1#PBF differ from LTC1550LCMS8-4.1#PBF?
The LTC1551LCMS8-4.1#PBF has an active-high SHDN pin: driving it high enables operation; driving it low enters shutdown (0.2µA IQ). In contrast, LTC1550LCMS8-4.1#PBF uses active-low SHDN. Both share identical regulation, ripple, and package-only control polarity differs.
LTC1551LCMS8-4.1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Negative
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -4.1V
- Voltage - Output (Max):
- -
- 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
LTC1551LCMS8-4.1#PBF FAQ
1.How can I place an order for LTC1551LCMS8-4.1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1551LCMS8-4.1#PBF 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 LTC1551LCMS8-4.1#PBF reliable?
The price and inventory of LTC1551LCMS8-4.1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1551LCMS8-4.1#PBF is usually 5 days.
3.What payment methods are accepted for LTC1551LCMS8-4.1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1551LCMS8-4.1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1551LCMS8-4.1#PBF?
LTC1551LCMS8-4.1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1551LCMS8-4.1#PBF 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 LTC1551LCMS8-4.1#PBF?
For technical support, including LTC1551LCMS8-4.1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1551LCMS8-4.1#PBF requirements.
6.How does Aetrix verify that LTC1551LCMS8-4.1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1551LCMS8-4.1#PBF 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 LTC1551LCMS8-4.1#PBF meets industry standards.
7.What is the process for return or replacement of LTC1551LCMS8-4.1#PBF?
All LTC1551LCMS8-4.1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1551LCMS8-4.1#PBF, 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 LTC1551LCMS8-4.1#PBF part is unused and in its original packaging.
Return procedure for LTC1551LCMS8-4.1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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