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Analog Devices Inc. LTC1550IGN#TRPBF
- Part No.:
- LTC1550IGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1550IGN#TRPBF.pdf
- Description:
- IC REG CHRG PUMP ADJ 10MA 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,714
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Product details
Overview
LTC1550IGN#TRPBF from Analog Devices (formerly Linear Technology) is an adjustable-output, low-noise switched-capacitor voltage inverter with integrated linear post-regulator. It generates regulated negative output voltages from a single 2.7V–6.5V positive supply, delivers up to 10mA output current at –4.1V, maintains ±5% output regulation, and achieves <1mVP-P output ripple using only four external capacitors. It is used as a GaAs FET bias generator in portable RF transmitters.
For engineers reviewing the LTC1550IGN#TRPBF datasheet, LTC1550IGN#TRPBF pinout, LTC1550IGN#TRPBF application, or LTC1550IGN#TRPBF equivalent, key selection criteria include its adjustable output capability, 900kHz charge pump frequency, active-low shutdown (<1µA quiescent current), 16-pin SSOP package, and compatibility with 0.1µF ceramic flying capacitors in battery-powered RF systems.
Technical Context
The LTC1550IGN#TRPBF integrates a 900kHz switched-capacitor inverter stage followed by a negative linear regulator with internal 1.24V reference and feedback amplifier referenced to VOUT. Its ADJ pin accepts an external resistor divider to set output voltage per VOUT = –1.24V × (R1 + R2)/R2, enabling precise negative voltage programming across multiple fixed points including –1.5V, –2.0V, –2.5V, –3.0V, –3.5V, –4.1V, and –4.5V.
It features separate PGND and AGND pins for noise-sensitive analog regulation, SENSE pin for remote output sensing, REG open-drain flag indicating ±5% regulation status, and CPOUT providing unregulated negative charge pump output. The device operates over –40°C to 85°C and supports stable operation with ≥4.7µF output capacitance and 0.1µF flying capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Type | Adjustable negative voltage inverter with linear post-regulation |
| Input Voltage Range | 2.7V to 6.5V - enables direct use with Li-ion, 3.3V, and 5V rails |
| Max Output Current | 10mA at –4.1V with 5V input - sufficient for GaAs FET gate biasing |
| Output Ripple | <1mVP-P - achieved with 10µF tantalum + 0.1µF ceramic output capacitor |
| Charge Pump Frequency | 900kHz typical - avoids IF bands (400–600kHz), minimizes capacitor size |
| Shutdown Current | <1µA - enables ultra-low-power sleep mode in portable systems |
| Output Regulation Accuracy | ±5% over load (0–10mA) and input (2.7–6.5V) ranges - ensures stable bias under varying conditions |
Pinout & Package
Package: 16-lead plastic SSOP (GN), 0.150" wide, JEDEC MS-013AC compliant, thermal resistance θJA = 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 15, 16 | NC | No internal connection - must be left floating or tied to GND per layout best practice |
| 2 | C1+ | Positive terminal of flying capacitor C1 - connects to 0.1µF capacitor's anode |
| 4 | VOUT | Regulated negative output - requires ≥4.7µF bypass to AGND/PGND for loop stability |
| 5 | ADJ | Feedback node for output voltage setting - accepts resistor divider from AGND to VOUT |
| 6 | PGND | Power ground - low-impedance return path for charge pump and regulator power stages |
| 7 | AGND | Analog ground - reference for SENSE, REG, and ADJ; must tie to PGND at single point |
| 8 | VCC | Positive input supply - bypassed with ≥4.7µF capacitor close to pin for low-noise operation |
| 9 | SHDN | Active-low shutdown control - pulls supply current to <1µA when logic low |
| 10 | REG | Open-drain regulation status flag - sinks 7mA when output is within ±5% of target |
| 11 | SENSE | Output voltage sense input - connect directly to load for accurate remote regulation |
| 12 | CPOUT | Negative charge pump output - connects to 0.1µF storage capacitor to ground |
| 13 | C1– | Negative terminal of flying capacitor C1 - connects to 0.1µF capacitor's cathode |
| 14 | GND | Ground reference for internal circuitry - ties internally to PGND/AGND |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | Programmable from –1.5V to –4.5V via external resistor divider on ADJ pin |
| Integrated linear post-regulator | Reduces switching artifacts from charge pump, enabling <1mVP-P ripple without external LDO |
| Dual ground separation (PGND/AGND) | Minimizes coupling between high-current charge pump and precision regulation loop |
| 900kHz internal oscillator | Enables use of 0.1µF ceramic flying capacitors and avoids critical RF IF bands |
| REG status flag | Provides system-level monitoring of regulation integrity without additional circuitry |
| Remote SENSE capability | Compensates for PCB trace IR drop, ensuring accurate voltage delivery at load point |
Applications
| Portable RF Transmitter Bias | GaAs FET Gate Control |
|---|---|
|
Use Scenario: Providing stable negative gate bias to GaAs power amplifiers in cellular handsets and IoT radios. IC Role / Device Role / Timing Role: Adjustable negative voltage generator with fast transient response and ultra-low ripple for RF signal integrity. Use Value: Enables consistent amplifier linearity and efficiency across battery discharge cycle due to ±5% regulation and <1mVP-P noise floor. |
Use Scenario: Generating precise –2.0V to –4.1V gate control voltages for discrete GaAs FETs in front-end modules. IC Role / Device Role / Timing Role: Regulated inverter supplying clean, low-impedance negative bias independent of VCC variation. Use Value: Eliminates need for discrete op-amp-based bias circuits, reducing BOM count and board area while maintaining RF performance. |
| Battery-Powered Instrumentation | Single-Supply Signal Conditioning |
|
Use Scenario: Powering dual-supply op-amps and ADC drivers from a single Li-ion cell in handheld test equipment. IC Role / Device Role / Timing Role: Compact, low-quiescent-current negative rail generator supporting 10mA loads with minimal heat dissipation. Use Value: Extends battery life via <1µA shutdown current and enables rail-to-rail analog signal swing without external DC-DC converter. |
Use Scenario: Creating symmetric ±3.3V supplies for audio codecs and sensor interfaces in compact embedded systems. IC Role / Device Role / Timing Role: Programmable inverter paired with LDO or buck converter to generate matched negative rail. Use Value: Allows full-scale differential signal processing from single 3.3V input, improving SNR and dynamic range in space-constrained designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar negative voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1550CS8-4.1 | Fixed –4.1V output, 8-pin SO-8 package, 4.5V–6.5V input range only | Not adjustable; suited for cost-sensitive, volume production where output voltage is invariant | Select when design requires no external resistors and smaller footprint, but sacrifices flexibility |
| LTC1429IG#PBF | Synchronizable 2MHz charge pump, fixed –5V output, SO-8, higher max current (25mA) | Lacks linear post-regulator - ripple ~10mVP-P; requires external filtering for low-noise apps | Choose for higher current or clock-synchronized systems where timing alignment matters more than ultra-low ripple |
Compared with LTC1550CS8-4.1 and LTC1429IG#PBF, the LTC1550IGN#TRPBF uniquely combines adjustability, integrated linear regulation, and ultra-low ripple in a 16-pin SSOP - making it optimal for precision RF bias where voltage tuning and noise performance are co-critical.
Availability
LTC1550IGN#TRPBF is available at Aetrix Electronics and suitable for portable RF transmitters, GaAs FET biasing, and battery-powered instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1550IGN#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, datasheet archives, and application engineering for legacy Linear parts including the LTC series.
The LTC1550 family was designed specifically for low-noise, low-power negative voltage generation in portable RF systems - emphasizing GaAs FET biasing, minimal external components, and robust regulation under varying battery conditions.
FAQ
What output voltage range can the LTC1550IGN#TRPBF be configured for?
The LTC1550IGN#TRPBF supports adjustable negative output voltages from –1.5V to –4.5V, set via an external resistor divider connected between AGND and VOUT with the tap at ADJ. Common configurations include –2.0V, –3.0V, –4.1V, and –4.5V. The relationship is VOUT = –1.24V × (R1 + R2)/R2, where R1 connects from AGND to ADJ and R2 from ADJ to VOUT. This flexibility makes the LTC1550IGN#TRPBF ideal for multi-voltage RF bias requirements.
How does the LTC1550IGN#TRPBF achieve sub-1mVP-P output ripple?
The LTC1550IGN#TRPBF achieves <1mVP-P output ripple through its two-stage architecture: a 900kHz switched-capacitor inverter followed by a precision linear post-regulator with internal 1.24V reference and feedback amplifier. Using a 10µF tantalum capacitor in parallel with a 0.1µF ceramic capacitor at VOUT suppresses high-frequency switching spikes, while proper placement of the SENSE pin near the load ensures tight regulation. This eliminates the need for external LC filters in most GaAs FET bias applications, unlike simpler charge pumps such as the LTC1429IG#PBF.
What is the purpose of separate PGND and AGND pins on the LTC1550IGN#TRPBF?
The LTC1550IGN#TRPBF uses separate PGND (Pin 6) and AGND (Pin 7) to isolate high-current charge pump switching noise from the sensitive analog regulation circuitry. PGND carries pulsed currents from the flying capacitor network, while AGND serves as the quiet reference for the SENSE, REG, and ADJ functions. Internally, both grounds connect to the same substrate node, but externally they must be joined at a single low-impedance point - typically near the input capacitor - to prevent ground loops and preserve regulation accuracy. This separation is critical for achieving the specified <1mVP-P ripple performance.
Can the LTC1550IGN#TRPBF operate from a 3.3V supply?
Yes, the LTC1550IGN#TRPBF supports input voltages from 2.7V to 6.5V, making it fully compatible with 3.3V systems. At 3.3V input, it can deliver regulated outputs such as –1.5V or –2.0V with full ±5% regulation across 0–10mA loads. However, higher magnitude outputs like –4.1V require minimum VCC ≥ 4.5V per the Electrical Characteristics table. This wide input range allows the LTC1550IGN#TRPBF to serve diverse low-voltage platforms including USB-powered devices and energy-harvesting systems.
What is the function of the REG pin on the LTC1550IGN#TRPBF?
The REG pin on the LTC1550IGN#TRPBF is an open-drain output that pulls low when the VOUT voltage is within ±5% of its programmed value. With a 5V pull-up, it sinks up to 7mA and provides real-time system-level confirmation of regulation status - useful for fault detection, power sequencing, or enabling downstream circuitry only when bias is valid. Unlike enable signals, REG reflects actual output accuracy, not just device activation. This feature is unique to the LTC1550IGN#TRPBF among Linear's inverter families and adds diagnostic capability without external comparators.
LTC1550IGN#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):
- 4.5V
- Voltage - Input (Max):
- 6.5V
- Voltage - Output (Min/Fixed):
- -1.24V
- Voltage - Output (Max):
- -6.1V
- Current - Output:
- 10mA
- Frequency - Switching:
- 900kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC1550IGN#TRPBF FAQ
1.How can I place an order for LTC1550IGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1550IGN#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 LTC1550IGN#TRPBF reliable?
The price and inventory of LTC1550IGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1550IGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1550IGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1550IGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1550IGN#TRPBF?
LTC1550IGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1550IGN#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 LTC1550IGN#TRPBF?
For technical support, including LTC1550IGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1550IGN#TRPBF requirements.
6.How does Aetrix verify that LTC1550IGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1550IGN#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 LTC1550IGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1550IGN#TRPBF?
All LTC1550IGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1550IGN#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 LTC1550IGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC1550IGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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