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Analog Devices Inc. LT1611CS5#TRMPBF
- Part No.:
- LT1611CS5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LT1611CS5#TRMPBF.pdf
- Description:
- IC REG CUK ADJ 550MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,568
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Product details
Overview
LT1611CS5#TRMPBF from Analog Devices (formerly Linear Technology) is a current-mode, fixed-frequency inverting DC/DC switching regulator in a 5-lead SOT-23 package. It generates –5V at 150mA from a 5V input, operates down to 1.1V input, switches at 1.4MHz, delivers <1µA shutdown current, and achieves 1mVP–P output ripple with proper layout and ceramic output capacitors.
For engineers reviewing the LT1611CS5#TRMPBF datasheet, LT1611CS5#TRMPBF pinout, LT1611CS5#TRMPBF application, or LT1611CS5#TRMPBF equivalent, this page provides verified technical context, real-world performance boundaries, validated pin functions, confirmed alternative options for negative-bias generation, and supply-chain support details specific to this SOT-23 inverting regulator.
Technical Context
The LT1611CS5#TRMPBF implements a dual-inductor Cuk-derived inverting topology that filters both input and output sides, enabling low-noise negative voltage generation without charge pump artifacts. Its internal 1.4MHz oscillator drives a current-mode PWM control loop referenced to a precise –1.23V feedback threshold, with built-in slope compensation to maintain stability above 50% duty cycle.
It integrates a 36V-rated NPN switch with 300mV VCESAT at 300mA, supports VIN-to-VOUT differentials up to 33V, and features internally compensated loop dynamics-requiring only external R1/R2 feedback resistors and optional CPL phase-lead capacitor for transient optimization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Inverting Cuk converter: enables ultra-low output ripple and clean input current waveform vs. charge pumps. |
| Switching Frequency | 1.4MHz (typ): permits use of sub-3mm-height inductors and small ceramic capacitors, minimizing board area. |
| Output Voltage Accuracy | ±2.5% over temp: based on –1.23V ±25mV reference, enabling stable –5V regulation across 0°C to 70°C. |
| Max Output Current | 150mA at –5V from 5V input: limited by 800mA switch current limit and thermal design in SOT-23. |
| Shutdown Current | <1µA (max at VIN = 5V): ensures battery-powered systems retain >99.9% standby energy efficiency. |
| Output Ripple | 1mVP–P (measured): achievable with 22µF ceramic output cap (ESR ≈ 2mΩ) and optimized PCB layout. |
| Min Input Voltage | 1.1V (typ): supports single-cell Li-ion or NiMH operation with headroom for voltage sag. |
Pinout & Package
LT1611CS5#TRMPBF is housed in a 5-lead plastic SOT-23 package (JEDEC MO-178AA, EIAJ SC-74A), measuring 2.80–3.00 mm × 1.90 mm × 1.15 mm, with gull-wing leads and 0.95 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Internal Switch Collector | Connects to inductor L1A; high dI/dt node requiring minimal trace area and direct ground return path for EMI control. |
| GND (Pin 2) | Power Ground Reference | Primary ground return for switch, feedback amplifier, and oscillator; must tie directly to local ground plane. |
| NFB (Pin 3) | Negative Feedback Input | Senses –1.23V reference point; connects to resistor divider (R1/R2) from VOUT to set regulated output voltage. |
| SHDN (Pin 4) | Active-Low Enable Control | Drives device into <1µA shutdown when pulled ≤0.3V; requires ≥1V to enable normal operation. |
| VIN (Pin 5) | Input Supply Rail | Accepts 1.1V to 10V; must be locally bypassed with ≥1µF ceramic capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 1.4MHz switching | Enables use of 22µH inductors ≤2mm height and 1µF–22µF ceramic capacitors, reducing solution size to <0.25 in². |
| –1.23V precision feedback reference | Allows accurate negative output setting (e.g., –5V ±2.5%) without external reference IC or trimming. |
| Internally compensated control loop | Eliminates need for external compensation network; only R1/R2 and optional CPL required for stable operation. |
| Low-noise Cuk topology | Delivers 1mVP–P output ripple (vs. typical 20–50mVP–P in boost-based inverters) due to continuous output inductor current. |
| 36V switch rating | Supports VIN-to-VOUT differential up to 33V, enabling –10V generation from 4-cell (6.5V) inputs or higher-voltage bias rails. |
Applications
| MR Head Bias | Digital Camera CCD Bias |
|---|---|
Use Scenario: Providing stable, low-noise negative bias voltage for magnetoresistive (MR) read heads in HDD preamplifiers. IC Role / Device Role / Timing Role: Inverting regulator generating –5V rail with <1mVP–P ripple to minimize head-positioning error and signal distortion. Use Value: Replaces inefficient charge pumps, eliminating low-frequency noise that degrades SNR in analog front-end circuits. |
Use Scenario: Supplying negative bias to CCD image sensor substrate terminals in compact digital cameras. IC Role / Device Role / Timing Role: Compact SOT-23 inverter delivering –5V at 70mA from 3.3V input, synchronized to pixel clock timing. Use Value: Enables single-supply system architecture while meeting stringent 1mVP–P ripple requirement for low-dark-current imaging. |
| LCD Bias | GaAs FET Bias |
Use Scenario: Generating negative gate drive voltage for active-matrix LCD source drivers in portable displays. IC Role / Device Role / Timing Role: Low-quiescent-current (3mA no-load) inverter powering –5V VGL rail with fast load-step response (<40µs settling). Use Value: Maintains display contrast stability during dynamic screen updates without visible flicker or ghosting artifacts. |
Use Scenario: Supplying –5V gate bias to GaAs FET RF amplifiers in cellular infrastructure transceivers. IC Role / Device Role / Timing Role: High-PSRR inverting regulator operating from 5V supply, rejecting switching noise via dual-inductor filtering. Use Value: Prevents AM-to-PM distortion in RF stages by eliminating power-rail coupling into sensitive gate nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1614EMS8#TRPBF | MSOP-8 package; includes integrated low-battery detector; 200mA output capability; same 1.4MHz frequency. | Requires larger footprint and additional BOD circuitry; better suited for battery-monitoring systems needing undervoltage warning. | Select LT1614EMS8#TRPBF when board space allows MSOP-8 and system-level battery health monitoring is required. |
| LT1617ES5#TRMPBF | SOT-23-5 package; micropower design (20µA IQ); supports VOUT down to –34V; lower max output current (50mA at –5V). | Optimized for ultra-low-power, high-voltage negative bias (e.g., photomultiplier tubes); not suitable for 150mA loads. | Choose LT1617ES5#TRMPBF only for applications demanding <25µA quiescent current and output voltages beyond –10V. |
Compared with LT1611CS5#TRMPBF, LT1614EMS8#TRPBF offers higher output current and system monitoring but increases PCB area, while LT1617ES5#TRMPBF trades current capability for extreme low-power operation and extended voltage range-neither is pin-compatible, and both require layout revision.
Availability
LT1611CS5#TRMPBF is available at Aetrix Electronics and suitable for MR head bias, CCD imaging, LCD panel driver, and GaAs FET gate bias applications requiring stable component supply, low-noise negative voltage generation, and SOT-23 footprint compatibility.
Supply support for LT1611CS5#TRMPBF 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, manufacturing, and documentation for legacy Linear parts including the LT1611 family.
The LT1611CS5#TRMPBF belongs to Linear's precision inverting DC/DC converter product line, designed specifically for space-constrained, low-noise negative bias generation in data storage, imaging, and RF subsystems.
FAQ
What is the maximum input voltage rating for LT1611CS5#TRMPBF?
The absolute maximum VIN rating for LT1611CS5#TRMPBF is 10V. Exceeding this voltage risks permanent damage to the internal switch and control circuitry. While the SW pin tolerates up to 36V, the VIN pin itself must remain ≤10V per the Absolute Maximum Ratings table. For higher input differentials, external circuitry must ensure VIN stays within specification.
Can LT1611CS5#TRMPBF generate –10V output?
Yes, LT1611CS5#TRMPBF can generate –10V output-for example, from a 6.5V input-as demonstrated in Typical Application TA04. This requires adjusting the R1/R2 feedback divider to set –10V at the NFB pin (–1.23V), using appropriate inductors rated for higher peak current, and verifying thermal limits under 60mA load conditions.
Does LT1611CS5#TRMPBF require external compensation components?
No, LT1611CS5#TRMPBF is internally compensated. The control loop uses integrated RC and CC elements, so no external compensation network is needed. Only the R1/R2 feedback resistors and optionally a phase-lead capacitor (CPL) across R1 are required for stability and transient optimization.
What is the typical startup time for LT1611CS5#TRMPBF?
LT1611CS5#TRMPBF reaches final output voltage in approximately 450µs after SHDN is pulled high, assuming COUT = 22µF, VIN = 5V, and VOUT = –5V. With optional soft-start (RSS/CSS network), ramp time extends to 700µs or 2.1ms to limit inrush current, as shown in Figures 15 and 16 of the datasheet.
Which output capacitor type delivers lowest ripple with LT1611CS5#TRMPBF?
A 22µF X5R/X7R ceramic capacitor (e.g., Taiyo Yuden JMK325BJ226MM) delivers the lowest ripple-down to 1mVP–P-with LT1611CS5#TRMPBF. This requires proper PCB layout (cut ground copper at D1 cathode) and use of low-ESR (<5mΩ) ceramics; tantalum caps yield ~20mVP–P due to higher ESR.
LT1611CS5#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- 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):
- 0.9V
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- -0.9V
- Voltage - Output (Max):
- -10V (Switch)
- Current - Output:
- 550mA (Switch)
- Frequency - Switching:
- 1.4MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LT1611CS5#TRMPBF FAQ
1.How can I place an order for LT1611CS5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1611CS5#TRMPBF 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 LT1611CS5#TRMPBF reliable?
The price and inventory of LT1611CS5#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1611CS5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT1611CS5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1611CS5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1611CS5#TRMPBF?
LT1611CS5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1611CS5#TRMPBF 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 LT1611CS5#TRMPBF?
For technical support, including LT1611CS5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1611CS5#TRMPBF requirements.
6.How does Aetrix verify that LT1611CS5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT1611CS5#TRMPBF 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 LT1611CS5#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT1611CS5#TRMPBF?
All LT1611CS5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1611CS5#TRMPBF, 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 LT1611CS5#TRMPBF part is unused and in its original packaging.
Return procedure for LT1611CS5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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