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Analog Devices Inc. LT1617ES5#TRPBF
- Part No.:
- LT1617ES5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT1617ES5#TRPBF.pdf
- Description:
- IC REG CUK ADJ 300MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:5,568
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Product details
Overview
LT1617ES5#TRPBF from Analog Devices (formerly Linear Technology) is a micropower inverting DC/DC converter IC in a 5-lead SOT-23 package, designed for higher-power portable systems with 350mA current limit, 1.2V–15V input range, and –34V maximum output capability. It delivers regulated negative voltage for LCD bias, handheld computers, and battery backup circuits using fixed off-time control and an integrated 36V NPN switch.
For engineers reviewing the LT1617ES5#TRPBF datasheet, LT1617ES5#TRPBF pinout, LT1617ES5#TRPBF application, or LT1617ES5#TRPBF equivalent, key selection criteria include its 400ns minimum off-time, 250mV VCE(SAT) at 300mA, 20µA quiescent current, –1.23V feedback reference, and compatibility with low-profile inductors in space-constrained designs.
Technical Context
The LT1617ES5#TRPBF implements a constant off-time (COT) control architecture with internal bandgap reference and hysteresis-based feedback regulation. Its one-shot driver resets after 400ns, enabling high efficiency across load currents from 1mA to 350mA without external compensation.
It integrates a 36V-rated NPN power switch with 250mV saturation voltage at 300mA, supports inverting topology only, and uses the NFB pin to regulate output via external resistor divider-no internal error amplifier or compensation network required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.2V to 15V - enables direct operation from single Li-ion or multi-cell alkaline sources |
| Output Voltage Range | Up to –34V - supports high-voltage LCD bias without transformers or charge pumps |
| Switch Current Limit | 350mA typical - sets maximum inductor ramp current and defines peak output capability |
| Quiescent Current | 20µA active / 0.5µA shutdown - extends battery life in always-on portable devices |
| Feedback Reference | –1.23V ±25mV - precise threshold for output regulation via external resistor divider |
| Switch Off-Time | 400ns fixed - determines minimum switching frequency and enables use of sub-10µH inductors |
| VCE(SAT) | 250mV at 300mA - minimizes conduction loss and thermal rise under full load |
Pinout & Package
LT1617ES5#TRPBF is housed in a standard 5-lead plastic SOT-23 (S5) package measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and JEDEC SC-74A footprint compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Collector of internal NPN switch | Connects to inductor and Schottky diode anode; high dv/dt node requiring minimal trace area to reduce EMI |
| GND (Pin 2) | Power and signal ground reference | Must tie directly to local ground plane to ensure stable feedback and minimize noise coupling |
| NFB (Pin 3) | Inverting feedback input | Senses output voltage via resistor divider; regulates output by comparing to –1.23V internal reference |
| SHDN (Pin 4) | Enable/disable control input | Logic-level input: ≥0.9V enables operation; ≤0.25V forces shutdown and reduces IQ to 0.5µA |
| VIN (Pin 5) | Positive input supply | Requires local 4.7µF ceramic bypass capacitor placed adjacent to pin to suppress input ripple and supply transients |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 20µA quiescent current enables >1-year battery life in low-duty-cycle sensor nodes |
| High-voltage inverting capability | 36V-rated switch supports –34V outputs from 5V input-eliminates need for transformer-based topologies |
| Ultra-fast off-time | 400ns fixed off-time allows use of 10µH inductors instead of 47µH, reducing board area by >60% |
| Low-loss power switch | 250mV VCE(SAT) at 300mA limits conduction loss to <75mW, easing thermal design in sealed enclosures |
| Wide input range | 1.2V minimum start-up supports aging batteries and single-cell LiFePO4 systems down to end-of-discharge |
Applications
| LCD Bias Generation | Handheld Computer Power |
|---|---|
Use Scenario: Generating –15V to –20V bias for STN or TFT LCD panels in portable medical monitors and industrial HMIs. IC Role / Device Role / Timing Role: Inverting DC/DC controller providing regulated negative rail from 2.5–4.2V Li-ion battery. Use Value: Enables compact, transformerless design with <12mm² total solution size using 22µH inductors and 0.22µF feed-forward capacitor. | Use Scenario: Supplying –5V rail for analog front-end circuitry and op-amp bias in ruggedized handheld test equipment. IC Role / Device Role / Timing Role: Primary inverting regulator delivering 100mA continuous output with tight line regulation (0.1%/V). Use Value: Maintains stable display contrast and sensor accuracy across full battery discharge curve (4.2V → 2.8V). |
| Battery Backup Systems | Dual-Rail Portable Instrumentation |
Use Scenario: Providing –33V standby voltage for SRAM retention and real-time clock backup during main power failure. IC Role / Device Role / Timing Role: High-efficiency inverting charge pump converter operating from 5V system rail. Use Value: Achieves 72% efficiency at 20mA load with 10µH inductor and MBR0540 Schottky diode-no transformer needed. | Use Scenario: Generating ±20V rails for precision ADC drivers and op-amp supplies in portable oscilloscope front-ends. IC Role / Device Role / Timing Role: Dual-output inverting converter using shared SW/NFB pins and discrete diode routing. Use Value: Delivers matched +20V/–20V rails with <±2% cross-regulation and no additional ICs or layout complexity. |
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 |
|---|---|---|---|
| LT1611ES5#TRPBF | 1.4MHz fixed-frequency vs. LT1617ES5#TRPBF's variable-frequency COT; 150mA current limit; same SOT-23-5 package | Optimized for lower-noise, fixed-frequency operation in audio-sensitive applications; lower max output current | Select LT1611ES5#TRPBF when EMI filtering is critical and load current stays below 150mA |
| LT3467ES5#TRPBF | Higher 500mA current limit; wider 2.5V–16V input; integrated Schottky diode; different pinout (SW on Pin 5) | Reduces BOM count but requires PCB redesign; better suited for 3.3V/5V input systems with >200mA loads | Choose LT3467ES5#TRPBF only if upgrading from LT1617ES5#TRPBF for higher output current and integrated diode |
Compared with LT1617ES5#TRPBF, LT1611ES5#TRPBF trades variable-frequency efficiency for predictable EMI spectrum, while LT3467ES5#TRPBF increases output capability at the cost of pinout incompatibility and loss of ultra-low-VIN operation below 2.5V.
Availability
LT1617ES5#TRPBF is available at Aetrix Electronics and suitable for LCD bias generation, handheld computer power, and battery backup systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LT1617ES5#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 technical and manufacturing continuity for legacy Linear products including the LT1617 series.
The LT1617ES5#TRPBF belongs to Linear's micropower DC/DC converter product line, engineered specifically for space- and energy-constrained portable electronics requiring high-voltage negative rails without transformers or complex magnetics.
FAQ
What is the minimum input voltage required for LT1617ES5#TRPBF to start switching?
The LT1617ES5#TRPBF has a guaranteed minimum input voltage of 1.2V for reliable startup and continuous operation. This enables direct use with partially discharged single-cell Li-ion batteries or low-voltage alkaline sources. Below 1.2V, the device may not initiate switching or sustain regulation, though it remains functional in shutdown mode down to 0V. The 1.2V specification is validated over temperature and process corners per the official Linear Technology datasheet.
Can LT1617ES5#TRPBF generate –34V output from a 5V input?
Yes, the LT1617ES5#TRPBF can generate up to –34V output from a 5V input because its internal NPN switch is rated for 36V collector-emitter breakdown. With proper external components-including a 30V+ Schottky diode (e.g., MBR0530), low-ESR output capacitor, and appropriately sized inductor-the LT1617ES5#TRPBF achieves this in inverting topology. The 36V rating ensures safe operation when VIN + |VOUT| ≤ 36V, making 5V → –34V (sum = 39V) marginally beyond absolute max; however, the datasheet confirms –34V output is achievable with 12V input, so 5V → –34V requires careful layout and derating.
What is the purpose of the 100pF feed-forward capacitor in LT1617ES5#TRPBF applications?
The 100pF feed-forward capacitor, placed across the upper feedback resistor (R1), improves transient response and reduces output voltage ripple in LT1617ES5#TRPBF circuits. It introduces a zero into the feedback loop that counteracts phase lag from the output capacitor's ESR and inductor, allowing faster correction of load steps without instability. This capacitor is especially effective at suppressing low-frequency ripple (<100kHz) caused by the 400ns off-time control scheme and is recommended in all high-precision applications such as LCD bias where ripple must stay below 10mVPP.
Does LT1617ES5#TRPBF require external compensation components?
No, the LT1617ES5#TRPBF does not require external compensation components. Its constant off-time control architecture with hysteresis-based feedback eliminates the need for loop compensation networks. The internal comparator compares the NFB pin voltage to a –1.23V reference and triggers switching based on fixed 400ns off-time and current-limit threshold-making it inherently stable across all load and input conditions without capacitors or resistors in the feedback path beyond the basic R1/R2 divider.
How does LT1617ES5#TRPBF behave during shutdown mode?
In shutdown mode, the LT1617ES5#TRPBF disables its internal oscillator, driver, and bandgap reference, reducing quiescent current to 0.5µA maximum. The SW pin becomes high-impedance, the NFB pin draws negligible current (<1nA), and the output voltage decays only through the load and output capacitor leakage. Recovery time from shutdown is typically <10µs once SHDN rises above 0.9V, and the device resumes regulation without soft-start delay-critical for fast wake-up in battery-powered instrumentation using LT1617ES5#TRPBF.
LT1617ES5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- 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):
- 1.2V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- -1.2V
- Voltage - Output (Max):
- -34V
- Current - Output:
- 300mA (Switch)
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LT1617ES5#TRPBF FAQ
1.How can I place an order for LT1617ES5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1617ES5#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 LT1617ES5#TRPBF reliable?
The price and inventory of LT1617ES5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1617ES5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1617ES5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1617ES5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1617ES5#TRPBF?
LT1617ES5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1617ES5#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 LT1617ES5#TRPBF?
For technical support, including LT1617ES5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1617ES5#TRPBF requirements.
6.How does Aetrix verify that LT1617ES5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1617ES5#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 LT1617ES5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1617ES5#TRPBF?
All LT1617ES5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1617ES5#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 LT1617ES5#TRPBF part is unused and in its original packaging.
Return procedure for LT1617ES5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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