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Analog Devices Inc. LT1614IS8#TRPBF
- Part No.:
- LT1614IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1614IS8#TRPBF.pdf
- Description:
- IC REG CUK ADJ 750MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,876
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Product details
Overview
LT1614IS8#TRPBF from Analog Devices (formerly Linear Technology) is an industrial-grade, fixed-frequency inverting switching regulator IC that generates negative output voltages down to –24V from input as low as 1V. It integrates a 500mA NPN power switch with 295mV VCE(SAT), operates at 600kHz, delivers 1mA quiescent current, and includes a 200mV low-battery detector. It is used in GaAs FET bias, LCD bias, and positive-to-negative conversion circuits.
For engineers reviewing the LT1614IS8#TRPBF datasheet, LT1614IS8#TRPBF pinout, LT1614IS8#TRPBF application, or LT1614IS8#TRPBF equivalent, key selection criteria include minimum input voltage (1V), switching frequency (600kHz), output polarity (inverting), shutdown current (<10µA), and SO-8 package compatibility for space-constrained industrial power designs.
Technical Context
The LT1614IS8#TRPBF employs current-mode PWM control with a –1.24V internal reference and 600kHz oscillator to regulate negative outputs directly. Its error amplifier features 100V/V gain and 16µmhos transconductance, enabling stable loop compensation via external RC network on VC pin.
It implements cycle-by-cycle switch current limiting (0.75–1.2A), supports duty cycles up to 80%, and incorporates a dedicated low-battery detector with 180–220mV threshold and open-collector LBO output. The device shuts down to <10µA when SHDN is grounded and operates across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Inverting DC/DC converter - generates regulated negative output from positive input without external inverter stage |
| Switching Frequency | 600kHz (typical) - enables use of small 22µH inductors and ceramic output capacitors |
| Input Voltage Range | 1V to 6V - supports single-cell Li-ion, NiMH, or low-voltage logic rails |
| Output Voltage Range | Up to –24V - set by external resistor divider on NFB pin with –1.24V reference |
| Max Output Current | 200mA at –5V (from 5V input) - limited by 500mA internal NPN switch and thermal design |
| Quiescent Current | 1mA (active), <10µA (shutdown) - critical for battery-powered systems requiring long standby life |
| Low-Battery Threshold | 200mV ±20mV - provides accurate undervoltage detection with 1MΩ load gain of 1000V/V |
Pinout & Package
LT1614IS8#TRPBF is housed in an 8-lead plastic SO (Small Outline) package, 0.150" wide, with standard JEDEC MS-012AC footprint and RoHS-compliant matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NFB (Pin 1) | Negative feedback input | Connects to resistor divider tap; references –1.24V internal bandgap for output regulation |
| VC (Pin 2) | Error amplifier compensation | External RC network (e.g., 100kΩ + 1nF) sets loop stability and transient response |
| SHDN (Pin 3) | Shutdown control | Ground to disable; tie to VIN or higher to enable; floating causes erratic behavior |
| GND (Pin 4) | Power ground | Primary return path for switch, feedback, and compensation currents; must connect to local ground plane |
| SW (Pin 5) | Internal NPN switch collector | High-slew node; requires minimized trace area to reduce EMI and voltage spikes |
| VIN (Pin 6) | Input supply | Accepts 1V–6V; requires 1µF ceramic bypass capacitor placed adjacent to pin |
| LBI (Pin 7) | Low-battery detector input | 200mV reference input; 5–30nA bias current; voltage range 0–700mV |
| LBO (Pin 8) | Low-battery detector output | Open-collector NPN; sinks 10µA; requires external 1MΩ pull-up; disabled during shutdown |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 600kHz operation | Ensures predictable EMI profile and eliminates low-frequency noise in sensitive analog subsystems |
| 1V minimum input voltage | Enables regulation from single alkaline/NiMH cells or partially discharged Li-ion batteries |
| 295mV VCE(SAT) @ 500mA | Reduces conduction loss and improves efficiency in high-current inverting topologies |
| Integrated low-battery detector | Provides system-level brown-out protection without external comparators or references |
| Current-mode PWM control | Delivers inherent cycle-by-cycle overcurrent protection and stable operation across wide load ranges |
Applications
| MR Head Bias | LCD Bias |
|---|---|
Use Scenario: Providing precise negative bias voltage for magnetoresistive (MR) read heads in hard disk drive preamplifiers. IC Role / Device Role / Timing Role: Inverting regulator generating –3.1V at 200mA from 3.3V rail with <5% load regulation and <5mVP–P ripple. Use Value: Enables stable head operation under varying temperature and supply conditions while minimizing board space versus discrete solutions. |
Use Scenario: Generating negative gate drive voltage for active-matrix LCD source drivers in portable instrumentation. IC Role / Device Role / Timing Role: Fixed-frequency inverter delivering –15V at 80mA from 5V input with >65% efficiency at full load. Use Value: Eliminates need for external charge pumps or transformers, reducing BOM count and EMI emissions. |
| GaAs FET Bias | Positive-to-Negative Conversion |
Use Scenario: Supplying adjustable negative gate bias (–2V to –8V) for GaAs FET RF amplifiers in wireless infrastructure modules. IC Role / Device Role / Timing Role: Regulated inverting converter with external resistor divider enabling fine-tuned output voltage setting. Use Value: Maintains consistent FET transconductance across temperature via tight –1.24V reference and low line regulation (0.3%/V). |
Use Scenario: Converting 5V system rail to –5V auxiliary supply for op-amp dual-rail operation in data acquisition front-ends. IC Role / Device Role / Timing Role: High-efficiency inverting regulator achieving 80%+ efficiency at 200mA with ceramic-only output filtering. Use Value: Delivers ultra-low-noise –5V output (<5mVP–P) compatible with precision ADC reference buffers and sensor signal chains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1611IS5#TRPBF | 5-lead SOT-23, 1.4MHz, –5V/150mA, lower IQ (800µA), no LBO/LBI | Lacks low-battery detection; suited for compact, cost-sensitive bias supplies without monitoring | Select when board space is critical and battery monitoring is unnecessary |
| LT1931ES5#TRPBF | 5-lead SOT-23, 1.2MHz, –5V/350mA, 1mVP–P ripple, integrated soft-start | Higher output current and lower ripple; no low-battery detector; different compensation scheme | Prefer for higher-current, low-noise applications where LBO functionality is not required |
Compared with LT1614IS8#TRPBF, LT1611IS5#TRPBF trades detection capability and SO-8 layout compatibility for smaller footprint and higher frequency, while LT1931ES5#TRPBF offers superior ripple performance and current capability but omits the integrated low-battery monitor essential for battery-fed systems.
Availability
LT1614IS8#TRPBF is available at Aetrix Electronics and suitable for MR head bias, LCD bias, GaAs FET bias, and positive-to-negative conversion applications requiring stable component supply across industrial temperature ranges.
Supply support for LT1614IS8#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 legacy of high-performance analog and power management ICs with rigorous automotive and industrial qualification.
The LT1614 product line was designed specifically for low-input-voltage, inverting DC/DC conversion in space- and efficiency-constrained portable and industrial systems, emphasizing minimal external components and robust operation down to 1V input.
FAQ
What is the operating temperature range of the LT1614IS8#TRPBF?
The LT1614IS8#TRPBF is rated for industrial operation from –40°C to +85°C. This extended temperature grade is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics section, where parameters like LBI threshold voltage (180–220mV) and switching frequency (500–750kHz) are specified across the full –40°C to +85°C range with "G" designation.
Does the LT1614IS8#TRPBF support true shutdown mode with near-zero current draw?
Yes, the LT1614IS8#TRPBF draws less than 10µA in shutdown mode when the SHDN pin is grounded. This is verified in the Electrical Characteristics table under "Quiescent Current" with VSHDN = 0V, and further confirmed in the Shutdown Pin section, which states the device "shuts down to less than 10µA."
Can the LT1614IS8#TRPBF generate –24V output, and what are the practical limitations?
Yes, the LT1614IS8#TRPBF can generate up to –24V output, as stated in the opening description and supported by the –1.24V feedback reference and external resistor divider configuration. Practical limitations include maximum duty cycle (80%), switch current limit (0.75–1.2A), and thermal dissipation in the SO-8 package - achievable output current decreases as |VOUT| increases.
What is the function of the LBO and LBI pins on the LT1614IS8#TRPBF?
The LBI (Pin 7) is the low-battery detector input referenced to an internal 200mV threshold; the LBO (Pin 8) is its open-collector output that sinks 10µA when triggered. As documented in the Pin Functions and Low-Battery Detector sections, LBO is disabled during shutdown, and both pins require external resistors only if used - floating LBI disables detection.
Is the LT1614IS8#TRPBF pin-compatible with other members of the LT161x family?
No, the LT1614IS8#TRPBF is not pin-compatible with other LT161x variants. The LT1611/LT1617 use 5-lead SOT-23 packages, while LT1614IS8#TRPBF uses 8-lead SO. Even the LT1614CS8 (commercial grade) shares the same SO-8 pinout but differs in temperature rating - the IS8 suffix denotes industrial grade, not pinout variation.
LT1614IS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Negative
- Topology:
- Cuk
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- -1.24V
- Voltage - Output (Max):
- -24V
- Current - Output:
- 750mA (Switch)
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1614IS8#TRPBF FAQ
1.How can I place an order for LT1614IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1614IS8#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 LT1614IS8#TRPBF reliable?
The price and inventory of LT1614IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1614IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1614IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1614IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1614IS8#TRPBF?
LT1614IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1614IS8#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 LT1614IS8#TRPBF?
For technical support, including LT1614IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1614IS8#TRPBF requirements.
6.How does Aetrix verify that LT1614IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1614IS8#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 LT1614IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1614IS8#TRPBF?
All LT1614IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1614IS8#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 LT1614IS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1614IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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