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Analog Devices Inc. LT1614IMS8#TRPBF
- Part No.:
- LT1614IMS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1614IMS8#TRPBF.pdf
- Description:
- IC REG CUK ADJ 750MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,937
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Product details
Overview
LT1614IMS8#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) at 500mA, features a 200mV low-battery detector, and delivers 600kHz switching for compact magnetics. It is used in GaAs FET bias, LCD bias, and positive-to-negative conversion circuits.
For engineers reviewing the LT1614IMS8#TRPBF datasheet, LT1614IMS8#TRPBF pinout, LT1614IMS8#TRPBF application, or LT1614IMS8#TRPBF equivalent, key selection criteria include minimum input voltage (1V), feedback reference (–1.24V), shutdown current (<10µA), quiescent current (1mA), and MS8 package thermal resistance (θJA = 120°C/W).
Technical Context
The LT1614IMS8#TRPBF employs current-mode PWM control with a fixed 600kHz oscillator and a –1.24V internal reference, enabling precise regulation of negative outputs via external resistor divider on the NFB pin. Its error amplifier features 100V/V gain and 16µmhos transconductance, compensated externally via the VC pin using a series RC network (e.g., 100kΩ + 1nF).
It implements cycle-by-cycle switch current limiting (0.75–1.2A), supports duty cycles up to 80%, and includes integrated low-battery detection with 200mV threshold referenced to GND. The device operates across –40°C to +85°C and shuts down to <10µA when SHDN is grounded.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1V to 6V - enables operation from single-cell LiFePO₄ or NiMH batteries without pre-regulation. |
| Output Polarity & Range | Inverting topology; output adjustable down to –24V - supports high-voltage bias rails for RF and display applications. |
| Switching Frequency | 500–750kHz (typ. 600kHz) - allows use of small 22µH inductors and ceramic capacitors, reducing board area and EMI filtering burden. |
| Internal Switch | NPN transistor rated 500mA, VCE(SAT) = 295mV @ 500mA - minimizes conduction loss and thermal rise in compact MSOP package. |
| Feedback Reference | –1.24V (±30mV) at NFB pin - provides stable setpoint for precision negative voltage regulation independent of temperature drift. |
| Quiescent Current | 1mA (no load) - ensures high light-load efficiency in battery-powered systems requiring long standby time. |
| Shutdown Current | <10µA - enables ultra-low-power system-level sleep modes without external disconnect circuitry. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including automotive under-hood auxiliary supplies and factory automation sensors. |
Pinout & Package
LT1614IMS8#TRPBF is housed in an 8-lead plastic MSOP (MS8) package with 0.65mm pitch, 3.0mm × 3.0mm body, and θJA = 120°C/W. Exposed pad is not present; thermal performance relies on PCB copper area connected to GND pin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NFB (Pin 1) | Negative Feedback Input | Connects to resistive divider tap; –1.24V reference sets output voltage: VOUT = –1.24V × (1 + R1/R2). |
| VC (Pin 2) | Error Amplifier Compensation | External RC network (e.g., 100kΩ + 1nF) stabilizes loop response; trace area must be minimized to reduce noise coupling. |
| SHDN (Pin 3) | Enable/Shutdown Control | Ground to disable (IQ < 10µA); tie to VIN or higher to enable; floating causes erratic behavior - must not be left unconnected. |
| GND (Pin 4) | Power Ground Reference | Primary return path for switch, feedback, and compensation currents; requires low-inductance connection to local ground plane. |
| SW (Pin 5) | Internal Switch Collector | High-slew-rate node; layout must minimize trace length/area to suppress EMI and prevent ground bounce. |
| VIN (Pin 6) | Input Supply | Requires 1µF ceramic bypass capacitor placed directly at pin; supports 1V–6V range with 0.3%/V line regulation above 2V. |
| LBI (Pin 7) | Low-Battery Detector Input | Compares external voltage to 200mV internal reference; bias current ≤30nA (–40°C to +85°C) enables high-impedance sensing. |
| LBO (Pin 8) | Low-Battery Output | Open-collector output sinking ≤10µA; requires 1MΩ pull-up; disabled during shutdown - used for host processor alert signaling. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 600kHz switching frequency | Enables predictable EMI profile and consistent filter design; eliminates subharmonic oscillation via ramp generator. |
| Integrated 200mV low-battery detector | Provides system-level battery health monitoring without external comparators or references - reduces BOM count by one IC. |
| 0.1Ω effective output impedance | Delivers tight load regulation (e.g., –5V ±1% from 0–200mA) without external post-regulation, simplifying multi-rail designs. |
| –5V at 200mA from 5V input | Demonstrated in Figure 1 with >80% efficiency - validates suitability for powering analog front-ends and sensor bias networks. |
| MSOP-8 industrial temperature grade | Rated for –40°C to +85°C with guaranteed specs (not characterized only); supports deployment in uncontrolled ambient environments. |
| Low-noise inverting topology | Supports Cuk-derived configurations (Fig. 4) achieving <5mVP–P ripple with ceramic output caps - meets sensitive analog supply requirements. |
Applications
| MR Head Bias | LCD Bias |
|---|---|
Use Scenario: Providing stable negative bias voltage for magnetoresistive (MR) read heads in hard disk drive preamplifiers. IC Role / Device Role / Timing Role: Inverting DC/DC converter generating –5V to –12V rail with low output impedance and minimal ripple. Use Value: Enables high signal-to-noise ratio in read channel by suppressing supply-induced head noise; 0.1Ω effective output impedance maintains regulation under dynamic head current loads. |
Use Scenario: Generating negative gate drive voltage for active-matrix LCD source drivers requiring dual-polarity supplies. IC Role / Device Role / Timing Role: Compact inverting regulator delivering –15V at 80mA from 5V logic rail in space-constrained display modules. Use Value: Achieves >65% efficiency at full load (Fig. TA06) while fitting within narrow bezel PCB real estate; MSOP-8 footprint saves >40% area vs SO-8 alternatives. |
| GaAs FET Bias | Positive-to-Negative Conversion |
Use Scenario: Supplying gate bias voltage for GaAs FETs in RF power amplifiers operating in cellular base station transceivers. IC Role / Device Role / Timing Role: High-stability negative voltage source with fast transient response to support pulsed RF operation. Use Value: Delivers –5V at 200mA with <5% deviation during 50mA→200mA load steps (Fig. F10/F11), ensuring consistent FET transconductance. |
Use Scenario: Converting standard 3.3V or 5V system rails into isolated negative supplies for op-amp dual-rail operation in data acquisition systems. IC Role / Device Role / Timing Role: Primary inverting regulator in compact instrumentation front-end, supporting 3.3V→–3.1V (Fig. TA03) and 5V→–5V topologies. Use Value: Eliminates need for charge pumps or transformer-based solutions; achieves 70–80% efficiency with all-ceramic BOM (Fig. TA07/TA08). |
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#TRMPBF | 5-lead SOT-23, 1.4MHz switching, lower max output current (150mA), no LBI/LBO pins. | Lacks low-battery monitoring; suited for cost-sensitive, low-current bias rails where footprint is critical. | Choose LT1611IS5#TRMPBF only if board space is constrained and battery monitoring is unnecessary. |
| LT1931ES5#TRMPBF | 5-lead SOT-23, 1.2MHz, 350mA output, 1mVP–P ripple spec, no LBI/LBO, different feedback polarity. | Optimized for ultra-low-noise analog supplies; lacks shutdown control and battery sense functionality. | Prefer LT1931ES5#TRMPBF when output ripple <1mVP–P is mandatory and system-level battery monitoring is handled elsewhere. |
Compared with LT1614IMS8#TRPBF, LT1611IS5#TRMPBF trades industrial temperature rating and integrated monitoring for smaller size and higher frequency, while LT1931ES5#TRMPBF prioritizes ripple performance over feature integration - making LT1614IMS8#TRPBF the balanced choice for industrial bias applications requiring reliability, monitoring, and moderate power.
Availability
LT1614IMS8#TRPBF is available at Aetrix Electronics and suitable for MR head bias, LCD bias, and GaAs FET bias applications requiring stable component supply, long-term industrial temperature support, and integrated low-battery detection.
Supply support for LT1614IMS8#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 industrial qualification standards.
The LT1614IMS8#TRPBF belongs to Linear's micropower inverting regulator product line, designed specifically for compact, high-efficiency negative voltage generation in battery-powered and space-constrained industrial systems.
FAQ
What is the minimum input voltage required for LT1614IMS8#TRPBF to regulate a –5V output?
The LT1614IMS8#TRPBF guarantees operation down to 1V input across its full industrial temperature range (–40°C to +85°C). At 25°C, it can start regulation from as low as 0.92V. For reliable –5V output at full load, a minimum of 1.25V input is recommended per datasheet Figure G06 and Table specifications - below this, duty cycle limits and switch losses may impair regulation.
Does LT1614IMS8#TRPBF support synchronous rectification?
No, the LT1614IMS8#TRPBF does not support synchronous rectification. It uses an internal NPN power switch and requires an external Schottky diode (e.g., MBR0520) in the inverting topology. The datasheet explicitly specifies diode-based designs in Figures 1, 3, 4, and TA01–TA07, with no provision for gate drive signals or external MOSFET control.
Can LT1614IMS8#TRPBF be used in Cuk topology with coupled inductors?
Yes, the LT1614IMS8#TRPBF is explicitly validated for Cuk topology with coupled inductors, as shown in Figure 16 and described in Applications Information section. Coiltronics CTX10-1 and CTX33-2 are cited as compatible coupled inductors, and phasing alignment is emphasized as critical to avoid saturation and ensure proper energy transfer.
What is the maximum output current achievable with LT1614IMS8#TRPBF at –15V output?
At –15V output, the LT1614IMS8#TRPBF delivers up to 80mA continuously, as demonstrated in the 5V-to–15V/80mA reference design (Figure TA05). This limit arises from switch current capability (0.75–1.2A peak), duty cycle constraints, and thermal dissipation in the MS8 package - exceeding 80mA risks thermal shutdown or reduced efficiency due to increased conduction losses.
How does the low-battery detector in LT1614IMS8#TRPBF behave during shutdown?
The low-battery detector in LT1614IMS8#TRPBF is fully disabled when the SHDN pin is grounded. As stated in the Pin Functions section and Figure 13, LBO goes high-impedance and the internal comparator is powered down. No current flows into LBI, and LBO remains inactive - confirming that battery monitoring is suspended during shutdown to eliminate parasitic drain.
LT1614IMS8#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-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-MSOP
LT1614IMS8#TRPBF FAQ
1.How can I place an order for LT1614IMS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1614IMS8#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 LT1614IMS8#TRPBF reliable?
The price and inventory of LT1614IMS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1614IMS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1614IMS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1614IMS8#TRPBF transactions.
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4.How is shipping managed for LT1614IMS8#TRPBF?
LT1614IMS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1614IMS8#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 LT1614IMS8#TRPBF?
For technical support, including LT1614IMS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1614IMS8#TRPBF requirements.
6.How does Aetrix verify that LT1614IMS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1614IMS8#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 LT1614IMS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1614IMS8#TRPBF?
All LT1614IMS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1614IMS8#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 LT1614IMS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1614IMS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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