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Analog Devices Inc. LT1614IMS8#PBF
- Part No.:
- LT1614IMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1614IMS8#PBF.pdf
- Description:
- IC REG CUK ADJ 750MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,534
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Product details
Overview
LT1614IMS8#PBF 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, operates at 600kHz, and features a 200mV low-battery detector threshold. It is used in LCD bias, GaAs FET bias, and positive-to-negative conversion circuits requiring compact, low-noise DC/DC inversion.
For engineers reviewing the LT1614IMS8#PBF datasheet, LT1614IMS8#PBF pinout, LT1614IMS8#PBF application, or LT1614IMS8#PBF equivalent, this page delivers verified technical context, exact pin functions, real-world efficiency curves (e.g., 5V→–5V/200mA at >80%), confirmed package dimensions (MSOP-8), and validated alternative options for negative-output DC/DC design.
Technical Context
The LT1614IMS8#PBF implements current-mode PWM control with a –1.24V internal reference and 600kHz oscillator, enabling stable regulation of negative outputs without external compensation complexity. Its architecture supports both single-inductor "charge-pump" and dual-inductor Cuk topologies - the latter delivering <5mVP–P ripple using ceramic output capacitors.
It embeds a dedicated low-battery detector (LBI/LBO pins) with 200mV threshold and 1000V/V gain, independent shutdown logic (<10µA quiescent in shutdown), and cycle-by-cycle switch current limiting (0.75–1.2A). The error amplifier provides 100V/V gain and 16µmhos transconductance for precise loop control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Inverting DC/DC converter - directly regulates negative output voltage without post-regulation stages. |
| Switching Frequency | 600kHz (typical) - enables use of small 22µH inductors and 1µF ceramic flying capacitors. |
| Input Voltage Range | 1V to 6V - supports single-cell Li-ion, NiMH, or 3.3V/5V rail inputs with full functionality down to 1V. |
| Output Voltage Range | –1.24V to –24V - set via external resistor divider on NFB pin; reference accuracy ±30mV over temperature. |
| Max Output Current | 200mA at –5V from 5V input (confirmed in Figure 1); up to 80mA at –15V (Figure TA05). |
| Quiescent Current | 1mA (active), <10µA (shutdown) - critical for battery-powered systems requiring long standby life. |
| Low-Battery Threshold | 200mV ±15mV - accurate detection of depleted input sources; LBO open-collector output sinks 10µA. |
Pinout & Package
LT1614IMS8#PBF is housed in an 8-lead MSOP package (3.0mm × 3.0mm × 0.85mm, 0.65mm pitch), rated for –40°C to +85°C operation (Industrial grade). Thermal resistance θJA = 120°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NFB (Pin 1) | Negative feedback input | Connects to resistor divider tap; internal –1.24V reference enables precise negative 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 enable | Ground to disable; must be tied ≥VIN to operate - floating causes erratic behavior. |
| GND (Pin 4) | Power ground | Primary return path; layout requires direct connection to local ground plane. |
| SW (Pin 5) | Internal NPN switch collector | High dv/dt node; minimize trace area to reduce EMI and spike noise. |
| VIN (Pin 6) | Input supply | Requires 1µF ceramic bypass capacitor placed adjacent to pin for high-frequency decoupling. |
| LBI (Pin 7) | Low-battery detector input | Accepts voltage between 0–700mV; 200mV threshold triggers LBO when input drops below trip point. |
| LBO (Pin 8) | Low-battery detector output | Open-collector output; sinks 10µA; requires external 1MΩ pull-up; disabled during shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 600kHz switching | Ensures predictable EMI profile and eliminates low-frequency beat noise in sensitive analog systems. |
| 0.1Ω effective output impedance | Delivers tight load regulation (<1% deviation from 50mA to 200mA) without post-LDO filtering. |
| 295mV VCE(SAT) @ 500mA | Minimizes conduction loss in the integrated NPN switch, improving efficiency at medium loads. |
| 1V minimum input voltage | Enables operation from deeply discharged single-cell batteries or ultra-low-voltage rails. |
| Ceramic-capacitor compatible | Supports X5R/X7R 1µF flying cap and large-value ceramic output caps - eliminates bulky tantalum. |
Applications
| MR Head Bias | LCD Bias |
|---|---|
Use Scenario: Providing stable negative bias voltage for magneto-resistive read heads in hard disk drive preamplifiers. IC Role / Device Role / Timing Role: Inverting regulator generating –3.1V at 200mA from 3.3V supply (Figure TA03), with <5mVP–P ripple. Use Value: Enables high-sensitivity MR head operation while avoiding noise-induced bit errors in data retrieval. |
Use Scenario: Supplying negative gate bias for active-matrix LCD column drivers in portable instrumentation. IC Role / Device Role / Timing Role: Generating –5V at 200mA from 5V input (Figure 1), achieving >80% efficiency across 10–200mA load range. Use Value: Reduces system BOM by eliminating discrete charge pumps and external LDOs. |
| GaAs FET Bias | Positive-to-Negative Conversion |
Use Scenario: Delivering precise –15V at 80mA for GaAs FET gate control in RF front-end modules. IC Role / Device Role / Timing Role: Inverting converter operating from 5V input (Figure TA05), optimized with 22µH inductors and MBR0520 Schottky diode. Use Value: Maintains FET pinch-off voltage stability under varying RF load conditions. |
Use Scenario: Converting standard 3.3V/5V system rails into isolated negative supplies for op-amp dual-rail operation. IC Role / Device Role / Timing Role: Core inverting DC/DC stage in signal conditioning circuits (e.g., audio ADC bias, sensor interface). Use Value: Eliminates need for transformer-based isolation or inefficient linear regulators in space-constrained designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1611IS5#TRMPBF | 5-lead SOT-23, 1.4MHz switching, –5V/150mA max, no LBI/LBO, lower IQ (85µA) | Targeted at ultra-compact, lower-current bias rails where battery detection is unnecessary | Choose for space-constrained PCBs needing higher frequency and smaller passives; not suitable for LBI-critical systems |
| LT1931ES5#TRMPBF | 5-lead SOT-23, 1.2MHz, –5V/350mA, 1mVP–P ripple, integrated soft-start, no LBI | Optimized for low-noise analog supply generation where high current and minimal ripple outweigh battery monitoring needs | Prefer when output ripple <1mVP–P and 350mA capability are required; lacks low-battery detection function |
Compared with LT1614IMS8#PBF, LT1611IS5#TRMPBF trades LBI/LBO and MSOP thermal performance for smaller footprint and higher frequency, while LT1931ES5#TRMPBF offers superior ripple suppression and current capacity but omits battery monitoring - making LT1614IMS8#PBF uniquely balanced for industrial biasing with system health awareness.
Availability
LT1614IMS8#PBF 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 extended temperature ranges.
Supply support for LT1614IMS8#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, documentation, and manufacturing continuity for legacy Linear parts including the LT1614 series.
The LT1614 belongs to Linear's micropower inverting regulator product line, designed specifically for space- and efficiency-sensitive negative-voltage generation in battery-powered instrumentation, display systems, and RF biasing.
FAQ
What is the operating temperature range for LT1614IMS8#PBF?
The LT1614IMS8#PBF is specified for Industrial grade operation from –40°C to +85°C. This is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics sections, where parameters like minimum input voltage and LBI threshold are guaranteed across this full range. The 'I' suffix in the part number explicitly denotes Industrial temperature qualification.
Can LT1614IMS8#PBF generate –15V output, and what is its efficiency at that level?
Yes, LT1614IMS8#PBF can generate –15V output - Figure TA05 shows a verified 5V-to–15V/80mA converter achieving ~68% peak efficiency. The design uses 22µH inductors, MBR0520 diode, and standard external resistors. Efficiency drops at lighter loads due to fixed switching losses, but remains viable for low-power GaAs FET bias applications.
Does LT1614IMS8#PBF require an external diode, and which type is recommended?
Yes, LT1614IMS8#PBF requires an external Schottky diode - the datasheet explicitly recommends Motorola MBR0520 (or equivalent 20V/0.5A Schottky) for ≤20V VIN–|VOUT| differential. For higher differentials (e.g., 5V→–15V), MBR0530 (30V rating) is advised. The diode conducts during switch-off phase and must handle peak currents up to 1.2A.
How does the low-battery detector in LT1614IMS8#PBF function, and is it active during shutdown?
The LT1614IMS8#PBF low-battery detector uses an internal 200mV reference and PNP input stage on LBI pin, driving open-collector LBO output. It is explicitly disabled when SHDN is pulled low - stated in both the Pin Functions section and Figure 14 caption. LBO remains high-impedance during shutdown, preventing false system alerts.
What are the key layout requirements for minimizing noise in LT1614IMS8#PBF designs?
Critical layout practices for LT1614IMS8#PBF include: (1) tying D1's cathode directly to the LT1614 GND pin before connecting to main ground plane, (2) placing 1µF ceramic C1 adjacent to VIN pin, (3) minimizing SW and VC trace areas, and (4) using cut ground copper under D1's cathode (Figure 12). These steps suppress high-frequency spikes and achieve <5mVP–P ripple.
LT1614IMS8#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-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#PBF FAQ
1.How can I place an order for LT1614IMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1614IMS8#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 LT1614IMS8#PBF reliable?
The price and inventory of LT1614IMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1614IMS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1614IMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1614IMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1614IMS8#PBF?
LT1614IMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1614IMS8#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 LT1614IMS8#PBF?
For technical support, including LT1614IMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1614IMS8#PBF requirements.
6.How does Aetrix verify that LT1614IMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1614IMS8#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 LT1614IMS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1614IMS8#PBF?
All LT1614IMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1614IMS8#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 LT1614IMS8#PBF part is unused and in its original packaging.
Return procedure for LT1614IMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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