My Inquiry
My Account
Analog Devices Inc. LTC1550LCGN#TRPBF
- Part No.:
- LTC1550LCGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1550LCGN#TRPBF.pdf
- Description:
- IC REG CHARGE PUMP ADJ 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,402
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1550LCGN#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 fixed 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 LTC1550LCGN#TRPBF datasheet, LTC1550LCGN#TRPBF pinout, LTC1550LCGN#TRPBF application, or LTC1550LCGN#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 16-pin SSOP package with REG and ADJ pins for power-valid signaling and adjustable variants.
Technical Context
The LTC1550LCGN#TRPBF integrates an inverting charge pump stage (900kHz oscillator, S1–S4 switch array, C1+/C1–/CPOUT terminals) followed by a negative linear regulator using an N-channel MOSFET pass device and internal 1.225V reference. Regulation is achieved via feedback to the ADJ pin (in adjustable versions) or internal resistor divider (in fixed –4.1V version).
Its architecture minimizes switching artifacts through fast transient response of the linear post-regulator, requiring specific capacitor ESR values (moderate, not ultra-low) for loop stability. The REG open-drain output sinks 4mA at 5V and asserts low when VOUT is within ±5% of target - a feature exclusive to the 16-pin GN package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed –4.1V (±2.5% regulation over line, load, temperature) |
| Max Output Current | 20mA at VCC ≥ 4.75V; drops with lower input or higher |VOUT| |
| Output Ripple | <1mVP-P typical with 10µF + 0.1µF ceramic output capacitor |
| Supply Range | 4.5V to 5.25V (minimum required for –4.1V output at full load) |
| Shutdown Current | 0.2µA typical (active-low SHDN pulls to GND) |
| Oscillator Frequency | 900kHz - places switching noise outside 400–600kHz IF bands |
| Reference Voltage | 1.225V internal bandgap reference used for regulation accuracy |
Pinout & Package
Package: 16-lead narrow SSOP (GN), 0.150" width, RoHS-compliant, moisture-sensitive level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 13, 16 | NC | No internal connection - must be left unconnected or grounded per layout best practice |
| 2 | C1+ | Positive terminal of flying capacitor C1; connects to C1– via 0.1µF charge pump capacitor |
| 4 | VOUT | Regulated negative output (–4.1V); requires ≥10µF output capacitor for ripple spec |
| 5 | C1– | Negative terminal of flying capacitor C1; forms charge transfer path with C1+ |
| 6 | PGND | Power ground - low-impedance return for charge pump and regulator currents |
| 7 | AGND | Analog ground - separate low-noise reference for regulator feedback and REF |
| 8 | NC | No internal connection |
| 9 | VCC | Positive input supply (4.5–5.25V); requires ≥2.2µF bypass capacitor near pin |
| 10 | SHDN | Active-low shutdown control; pulls low to disable charge pump and reduce IQ to 0.2µA |
| 11 | REG | Open-drain power-good flag; sinks 4mA when VOUT is within ±5% of –4.1V |
| 12 | CPOUT | Negative charge pump output node; requires 0.1µF storage capacitor to PGND |
| 14 | ADJ | Feedback input for adjustable versions; tied to internal 1.225V reference in fixed –4.1V variant |
| 15 | NC | No internal connection |
Key Features
| Feature | Design Value |
|---|---|
| Integrated linear post-regulator | Reduces charge pump ripple to <1mVP-P without external LDO or filter stages |
| 900kHz charge pump frequency | Enables use of standard 0.1µF ceramic flying capacitors; avoids IF band interference |
| REG open-drain power-valid output | Provides system-level power sequencing and fault detection without external comparator |
| Low quiescent current in shutdown | 0.2µA max enables battery-powered operation with multi-year standby life |
| Stable with moderate-ESR output caps | Eliminates need for complex RC compensation; supports standard tantalum + ceramic combos |
Applications
| Portable RF Transmitter Bias | GaAs FET Power Amplifier Supply |
|---|---|
Use Scenario: Generating stable –4.1V gate bias for GaAs FETs in cellular handset power amplifiers. IC Role / Device Role / Timing Role: Negative voltage inverter with linear post-regulation providing low-noise, ripple-free bias voltage. Use Value: Enables high-efficiency RF PA operation with minimal AM-to-PM distortion due to <1mVP-P ripple. | Use Scenario: Supplying precise negative gate voltage to GaAs-based front-end modules in 3G/4G LTE handsets. IC Role / Device Role / Timing Role: Fixed-output charge pump inverter delivering regulated –4.1V with fast transient response to PA enable/disable cycles. Use Value: Guarantees ±2.5% output regulation across temperature and battery voltage sag, maintaining PA linearity. |
| Battery-Powered Instrumentation | Single-Supply Signal Conditioning |
Use Scenario: Providing clean negative rail for op-amps and ADC drivers in portable test equipment. IC Role / Device Role / Timing Role: Low-noise negative supply generator with REG flag for system power monitoring. Use Value: REG output enables microcontroller to verify bias rail integrity before analog measurement cycles. | Use Scenario: Creating symmetric ±4.1V rails from a single 5V supply for precision sensor signal conditioning. IC Role / Device Role / Timing Role: Inverting charge pump with integrated linear regulation replacing discrete inverter + LDO solutions. Use Value: Reduces BOM count by 4 components (vs. discrete charge pump + LDO + resistors + caps) while improving PSRR. |
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 core functionality, but in 8-pin SO package; lacks REG and ADJ pins | No power-valid signaling; no support for adjustable output or external feedback | Select when board space allows larger SO package and REG functionality is unnecessary |
| LTC1550LCMS8-4.1 | Same core functionality, but in 8-pin MSOP package; lacks REG and ADJ pins | No power-valid signaling; no support for adjustable output or external feedback | Select when footprint must be smaller than SO but REG flag is not required |
Compared with LTC1550LCGN#TRPBF, the SO and MSOP alternatives omit the REG pin and ADJ capability - critical for systems requiring power-rail validation or future design flexibility - making the 16-pin GN package the only choice for designs needing those features.
Availability
LTC1550LCGN#TRPBF is available at Aetrix Electronics and suitable for portable RF transmitters, GaAs FET bias generators, and battery-powered instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1550LCGN#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 full product support, documentation, and manufacturing continuity for all Linear-branded ICs.
The LTC1550L family was designed specifically for low-noise, high-efficiency negative voltage generation in portable RF systems - emphasizing minimal external components, ultra-low ripple, and robust regulation under dynamic load conditions.
FAQ
What is the minimum input voltage required for LTC1550LCGN#TRPBF to deliver –4.1V at 20mA?
The LTC1550LCGN#TRPBF requires VCC ≥ 4.75V to guarantee –4.1V output at 20mA load current, as specified in the Electrical Characteristics table under "VOUT Output Regulation" for the –4.1V fixed version. At lower input voltages, output voltage droops or regulation fails.
Does LTC1550LCGN#TRPBF require external resistors to set its output voltage?
No. The LTC1550LCGN#TRPBF is the fixed –4.1V version; its output is set by internal resistor dividers. External resistors are only needed for adjustable variants (e.g., LTC1550LCGN#TRPBF's adjustable siblings), which use the ADJ pin - but this part has ADJ internally tied for –4.1V operation.
Can the REG pin on LTC1550LCGN#TRPBF be used without an external pull-up resistor?
No. The REG pin is open-drain and requires an external pull-up resistor (typically to 3.3V or 5V) to generate a valid logic-high signal. Without it, REG remains floating and cannot indicate power-good status - a mandatory design requirement for functional use of the REG feature in LTC1550LCGN#TRPBF.
Why does LTC1550LCGN#TRPBF specify moderate-ESR output capacitors instead of low-ESR types?
LTC1550LCGN#TRPBF's linear regulator feedback loop uses the ESR of the output capacitor to create a phase-lead zero for stability. Very low-ESR capacitors (e.g., polymer or ultra-low-ESR ceramics) remove this zero, risking oscillation. A moderate-ESR 10µF tantalum or aluminum electrolytic - paralleled with 0.1µF ceramic - satisfies both stability and ripple requirements.
Is LTC1550LCGN#TRPBF pin-compatible with other LTC1550L variants in the same package?
Yes. All LTC1550L variants in the 16-pin GN package (including LTC1550LCGN#TRPBF, LTC1550LCGN#PBF, and adjustable versions) share identical pinout, footprint, and thermal characteristics. Only the internal feedback network differs - allowing drop-in replacement where output voltage and REG/ADJ usage align.
LTC1550LCGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm 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:
- 16-SSOP
LTC1550LCGN#TRPBF FAQ
1.How can I place an order for LTC1550LCGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1550LCGN#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 LTC1550LCGN#TRPBF reliable?
The price and inventory of LTC1550LCGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1550LCGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1550LCGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1550LCGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1550LCGN#TRPBF?
LTC1550LCGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1550LCGN#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 LTC1550LCGN#TRPBF?
For technical support, including LTC1550LCGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1550LCGN#TRPBF requirements.
6.How does Aetrix verify that LTC1550LCGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1550LCGN#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 LTC1550LCGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1550LCGN#TRPBF?
All LTC1550LCGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1550LCGN#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 LTC1550LCGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC1550LCGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1550LCGN#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
